Scribe Notes -- October 31st, 2017

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Scribe Notes -- October 31st, 2017"

Transcription

1 Scribe Notes -- October 31st, 2017 TCP/IP Protocol Suite Most popular protocol but was designed with fault tolerance in mind, not security. Consequences of this: People realized that errors in transmission do happen Designed to be robust to failures but not to intentional attacks 4 layer architecture There are not clear exclusion between layers and not every vendor follows all of them 1.) Application HTTP, user-level programs, RFC (Request for Comment) RFC has no real standards, more like internal, proprietary architecture These internet drafts are then commented on and agreed upon / disagreed on If there is enough positive review, these are structured into a RFC 2.) Transport 3.) Network 4.) Data Link n-systems usually implement all 4 layers routers do not introduce the entire stack (up to the Network layer) OSI and TCP/IP Protocol Stack 7 layer architecture e.g. layer in TCP/IP is mapped to Physical and Link layers in OSI Consider the slide graphic for full understanding IP protocol contains bugs in the spec and has no built-in security ARP = associated resolution protocol RARP = reverse ARP PPP = point-to-point Functions of the Layers From top to bottom, hierarchy is less to more high-level Data Link Service: Reliable transfer of frames over a link MAC on a LAN Functions: framing (how to group bits together), MAC, error checking Direct connection Note : these are part of the specification but not every layer provides the necessary functionality. There are minimum functions that ought to be provided Networking layer Service: move packets from source host to destination host Functions: routing, addressing Page 1 of 5

2 Transport layer Service: delivery of data between hosts Functions: connection establishment/termination, error control, flow control This layer is necessary because of the Internet, direct connection is not required Application layer Service: application specific (delivery of , retrieval of HTML docs, reliable transfer of file) Functions: application specific If a layer does not perform error checking, the next-higher layer should Assignment of Protocols to Layers Consider the diagram on the slide for mapping and assignment ICMP, IGMP, and DHCP are responsible for managing networks and preventing D.O.S. attacks DHCP Connect without specific/manual assignment of IP addresses It is dynamic and resolves to local host names Vulnerabilities None of these protocols require authentication or authenticity Somebody can claim that this data is from a destination to a route If the receiver believes that this is true, authenticity of data is threatened Layered Communications An entity of particular layer can only communicate with 1.) a peer layer entity since a common protocol The lowest level is where bit transfer occurs Data is packaged to ensure we know where it comes from Routing security is provided at the IP layer Example Sends HTTP request to neon s URL or address via an IP address (acquired after DNS query) Translates to a TCP protocol (on argon ) by connecting to IP address at port 80 Tries to open connection on port 80 of neon via the IP address Sends a datagram which sends IP datagram to neon over the IP protocol Send the datagram to the ethernet to the IP address Calls up the ARP protocol and sends frame to ethernet interface and sends to it s IP layer which eventually connects to the receiving router s ethernet card These frames are sent up through the chain on neon Encapsulation As data is moving down the protocol stack, each protocol is adding layer-specific control information e.g. Application layer data (form data, JSON request, serialized data, etc.) Page 2 of 5

3 prepended by HTTP header (POST/GET/PATCH/PUT/DELETE request) prepended by TCP header (TCP segment) prepended by IP header (IP datagram) and sandwiched by the Ethernet header and footer (Ethernet frame) If data does not fit into a single Ethernet frame, items need to be broken-down into smaller packets Ethernet frames can vary in size between routers Reassembly is done at the final destination Ethernet Computer <-> Computer communication on same network Each device has unique MAC address (48-bit) CRC is important here If there is some error, check the CRC code Can detect some but not all errors Attackers can craft certain packets to create same CRC (checksums) It is a weak form of integrity checks IP: Internet Protocol Unreliable connectionless datagram delivery service Responsible for routing of data through intermediate networks and computers SSL implements better MAC, etc. than the IP layer Forged IP address attacks are common attack types Happens a lot by spam attacks ICMP: Internet Control Message Protocol Ping flood attacks is a common attack against ICMP Used to report problems with delivery of IP Datagrams within an IP network Used by Ping, Traceroute commands TCP: Transmission Control Protocol Connection-oriented, reliable, byte stream service Protocol Set up connection Transfer data Close connection Socrative Questions How would track wifi vulnerability has the potential to inject malicious code? See instructor for details Could you elaborate on what you mean when IP has lots of bugs? When we are running a protocol, two types of bugs 1.) specification of protocol Page 3 of 5

4 e.g. spec. does not say that encryption/authentication is needed e.g. length of message is such but can be exploited (overflow) as DoS e.g. DNS allows variable sized messages (few to kilo bytes) Attackers have found ways to exploit and cause DNS server to give out large messages causing DoS 2.) implementation e.g. OpenSSL / TLS problem; buffer overflow issue Why is data transferred through an intermediary? Why not directly? We will rarely have a situation where two hosts are directly connected, therefore, intermediary hosts must be utilized Like the postal service, letter is passed from post office to post office to mail carrier before making it to the recipient Do some routers that have a web app for management or allow for media hosting implement the application layer? Yes: if a router needs to managed, there must be some sort of application layer protocol For routers that form backbone of internet, there are different interfaces than HTTP applications What is a datagram? From Wikipedia: A datagram is a basic transfer unit associated with a packet-switched network. Datagrams are typically structured in header and payload sections. Datagrams provide a connectionless communication service across a packet-switched network. The delivery, arrival time, and order of arrival of datagrams need not be guaranteed by the network. Are the midterms grades going to be curved? The test was difficult. Appropriate actions will be taken. When traveling up a layer does the new header get appended to or taken from the packet? Yes, the headers get stripped off as it moves upward upon receipt. The routers will remove the Ethernet header, footer and, via information from IP header, will connect to the host router and attach a new Ethernet header, footer Packets are fragmented and reassembled IS HTTP just a way to alias IP addresses so that IP layer can find the corresponding IP that goes with that HTTP request? No, they are separate protocols and do not implement aliases Does fragmentation add a significant amount of time to data transmission? Yes, it adds some overhead Whenever fragmentation, there must be separate headers for each packet so that the receiving systems know what is to be expected Do WiFi and Ethernet use the same packets and protocol to communicate? No, Ethernet uses a wired protocol and provides collision detection whereas WiFi is wireless and provides collision avoidance Page 4 of 5

5 The protocols are completely separately WiFi avoids collisions whereas Ethernet tries to recover You mentioned that if a layer needs some service that a layer below it does not provide then it will implement that service to its own layer. Does this hold true for security services? Good question. He will get to this question in a future lecture. Are there any major differences for using HTTPS instead of HTTP for this example? Yes, there is added information to let the recipient know that it carries information framed by SSL protocol End-to-end secure information. Confidentiality and integrity provided with HTTPS Page 5 of 5

Chapter 2 - Part 1. The TCP/IP Protocol: The Language of the Internet

Chapter 2 - Part 1. The TCP/IP Protocol: The Language of the Internet Chapter 2 - Part 1 The TCP/IP Protocol: The Language of the Internet Protocols A protocol is a language or set of rules that two or more computers use to communicate 2 Protocol Analogy: Phone Call Parties

More information

Operating Systems. 16. Networking. Paul Krzyzanowski. Rutgers University. Spring /6/ Paul Krzyzanowski

Operating Systems. 16. Networking. Paul Krzyzanowski. Rutgers University. Spring /6/ Paul Krzyzanowski Operating Systems 16. Networking Paul Krzyzanowski Rutgers University Spring 2015 1 Local Area Network (LAN) LAN = communications network Small area (building, set of buildings) Same, sometimes shared,

More information

CSE/EE 461 The Network Layer. Application Presentation Session Transport Network Data Link Physical

CSE/EE 461 The Network Layer. Application Presentation Session Transport Network Data Link Physical CSE/EE 461 The Network Layer Application Presentation Session Transport Network Data Link Physical This Lecture Focus: What to do when one wire isn t big enough? Point to point link Broadcast link (Ethernet

More information

Review of Important Networking Concepts. Recall the Example from last lecture

Review of Important Networking Concepts. Recall the Example from last lecture Review of Important ing Concepts Review: ed communication architecture The TCP/IP protocol suite Jörg Liebeherr, 1998,1999 1 Recall the Example from last lecture Ellington.cs.virginia.edu establishes an

More information

CS61C Machine Structures Lecture 37 Networks. No Machine is an Island!

CS61C Machine Structures Lecture 37 Networks. No Machine is an Island! CS61C Machine Structures Lecture 37 Networks April 24, 2006 John Wawrzynek Page 1 No Machine is an Island! Computer Processor (active) Control ( brain ) Datapath ( brawn ) Memory (passive) (where programs,

More information

ETSF05/ETSF10 Internet Protocols Network Layer Protocols

ETSF05/ETSF10 Internet Protocols Network Layer Protocols ETSF05/ETSF10 Internet Protocols Network Layer Protocols 2016 Jens Andersson Agenda Internetworking IPv4/IPv6 Framentation/Reassembly ICMPv4/ICMPv6 IPv4 to IPv6 transition VPN/Ipsec NAT (Network Address

More information

Guide to Networking Essentials, 6 th Edition. Chapter 5: Network Protocols

Guide to Networking Essentials, 6 th Edition. Chapter 5: Network Protocols Guide to Networking Essentials, 6 th Edition Chapter 5: Network Protocols Objectives Describe the purpose of a network protocol, the layers in the TCP/IP architecture, and the protocols in each TCP/IP

More information

Chapter 2 Advanced TCP/IP

Chapter 2 Advanced TCP/IP Tactical Perimeter Defense 2-1 Chapter 2 Advanced TCP/IP At a Glance Instructor s Manual Table of Contents Overview Objectives Teaching Tips Quick Quizzes Class Discussion Topics Additional Projects Additional

More information

Administrivia CSC458 Lecture 4 Bridging LANs and IP. Last Time. This Time -- Switching (a.k.a. Bridging)

Administrivia CSC458 Lecture 4 Bridging LANs and IP. Last Time. This Time -- Switching (a.k.a. Bridging) Administrivia CSC458 Lecture 4 Bridging LANs and IP Homework: # 1 due today # 2 out today and due in two weeks Readings: Chapters 3 and 4 Project: # 2 due next week Tutorial today: Joe Lim on project 2

More information

Layer 4: UDP, TCP, and others. based on Chapter 9 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers

Layer 4: UDP, TCP, and others. based on Chapter 9 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Layer 4: UDP, TCP, and others based on Chapter 9 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Concepts application set transport set High-level, "Application Set" protocols deal only with how handled

More information

Networking interview questions

Networking interview questions Networking interview questions What is LAN? LAN is a computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings. However, one LAN can be connected

More information

Interconnecting Networks with TCP/IP. 2000, Cisco Systems, Inc. 8-1

Interconnecting Networks with TCP/IP. 2000, Cisco Systems, Inc. 8-1 Interconnecting Networks with TCP/IP 2000, Cisco Systems, Inc. 8-1 Objectives Upon completion of this chapter you will be able to perform the following tasks: Identify the IP protocol stack, its protocol

More information

TCP/IP and the OSI Model

TCP/IP and the OSI Model TCP/IP BASICS TCP/IP and the OSI Model TCP/IP BASICS The network protocol of the Internet Composed of six main protocols IP Internet Protocol UDP User Datagram Protocol TCP Transmission Control Protocol

More information

Overview of TCP/IP Overview of TCP/IP protocol: TCP/IP architectural models TCP protocol layers.

Overview of TCP/IP Overview of TCP/IP protocol: TCP/IP architectural models TCP protocol layers. Overview of TCP/IP 3 Overview of TCP/IP protocol: TCP/IP architectural models TCP protocol layers. 4 2 5 6 3 7 8 4 9 10 5 11 12 6 13 14 7 15 16 8 17 18 9 19 20 10 21 Why TCP/IP? Packet based Provides decentralized

More information

Goals and topics. Verkkomedian perusteet Fundamentals of Network Media T Circuit switching networks. Topics. Packet-switching networks

Goals and topics. Verkkomedian perusteet Fundamentals of Network Media T Circuit switching networks. Topics. Packet-switching networks Verkkomedian perusteet Fundamentals of Media T-110.250 19.2.2002 Antti Ylä-Jääski 19.2.2002 / AYJ lide 1 Goals and topics protocols Discuss how packet-switching networks differ from circuit switching networks.

More information

Network Model. Why a Layered Model? All People Seem To Need Data Processing

Network Model. Why a Layered Model? All People Seem To Need Data Processing Network Model Why a Layered Model? All People Seem To Need Data Processing Layers with Functions Packet Propagation Each router provides its services to support upper-layer functions. Headers (Encapsulation

More information

Guide to Networking Essentials, 6 th Edition. Chapter 6: Network Reference Models and Standards

Guide to Networking Essentials, 6 th Edition. Chapter 6: Network Reference Models and Standards Guide to Networking Essentials, 6 th Edition Chapter 6: Network Reference Models and Standards Objectives Explain the OSI reference model layers and their relationship to hardware and software Explain

More information

Single Network: applications, client and server hosts, switches, access links, trunk links, frames, path. Review of TCP/IP Internetworking

Single Network: applications, client and server hosts, switches, access links, trunk links, frames, path. Review of TCP/IP Internetworking 1 Review of TCP/IP working Single Network: applications, client and server hosts, switches, access links, trunk links, frames, path Frame Path Chapter 3 Client Host Trunk Link Server Host Panko, Corporate

More information

Applied Networks & Security

Applied Networks & Security Applied Networks & Security TCP/IP Networks with Critical Analysis http://condor.depaul.edu/~jkristof/it263/ John Kristoff jtk@depaul.edu IT 263 Spring 2006/2007 John Kristoff - DePaul University 1 Critical

More information

OSI Network Layer. Network Fundamentals Chapter 5. Version Cisco Systems, Inc. All rights reserved. Cisco Public 1

OSI Network Layer. Network Fundamentals Chapter 5. Version Cisco Systems, Inc. All rights reserved. Cisco Public 1 OSI Network Layer Network Fundamentals Chapter 5 Version 4.0 1 Objectives Identify the role of the Network Layer, as it describes communication from one end device to another end device. Examine the most

More information

Internet. 1) Internet basic technology (overview) 3) Quality of Service (QoS) aspects

Internet. 1) Internet basic technology (overview) 3) Quality of Service (QoS) aspects Internet 1) Internet basic technology (overview) 2) Mobility aspects 3) Quality of Service (QoS) aspects Relevant information: these slides (overview) course textbook (Part H) www.ietf.org (details) IP

More information

SC/CSE 3213 Winter Sebastian Magierowski York University CSE 3213, W13 L8: TCP/IP. Outline. Forwarding over network and data link layers

SC/CSE 3213 Winter Sebastian Magierowski York University CSE 3213, W13 L8: TCP/IP. Outline. Forwarding over network and data link layers SC/CSE 3213 Winter 2013 L8: TCP/IP Overview Sebastian Magierowski York University 1 Outline TCP/IP Reference Model A set of protocols for internetworking The basis of the modern IP Datagram Exchange Examples

More information

EITF25 Internet Techniques and Applications L7: Internet. Stefan Höst

EITF25 Internet Techniques and Applications L7: Internet. Stefan Höst EITF25 Internet Techniques and Applications L7: Internet Stefan Höst What is Internet? Internet consists of a number of networks that exchange data according to traffic agreements. All networks in Internet

More information

Introduction to Open System Interconnection Reference Model

Introduction to Open System Interconnection Reference Model Chapter 5 Introduction to OSI Reference Model 1 Chapter 5 Introduction to Open System Interconnection Reference Model Introduction The Open Systems Interconnection (OSI) model is a reference tool for understanding

More information

Internet protocols, TCP/IP suite

Internet protocols, TCP/IP suite Internet protocols, TCP/IP suite S-72.353 March 20, 2000 L353_8.shw Slide 1 of 23 Layered structure of TCP/IP /D\HU 6HUYL FHV 6073 '16 KWWS )73 7(/1(7 7 &3 8 '3 193,3,& 03,3 $53 5$53 &60$&' 7RNHQ ULQJ

More information

Internetwork Protocols

Internetwork Protocols Internetwork Protocols Background to IP IP, and related protocols Internetworking Terms (1) Communications Network Facility that provides data transfer service An internet Collection of communications

More information

APPENDIX F THE TCP/IP PROTOCOL ARCHITECTURE

APPENDIX F THE TCP/IP PROTOCOL ARCHITECTURE APPENDIX F THE TCP/IP PROTOCOL ARCHITECTURE William Stallings F.1 TCP/IP LAYERS... 2 F.2 TCP AND UDP... 4 F.3 OPERATION OF TCP/IP... 6 F.4 TCP/IP APPLICATIONS... 10 Copyright 2014 Supplement to Computer

More information

ENEE 457: Computer Systems Security 11/07/16. Lecture 18 Computer Networking Basics

ENEE 457: Computer Systems Security 11/07/16. Lecture 18 Computer Networking Basics ENEE 457: Computer Systems Security 11/07/16 Lecture 18 Computer Networking Basics Charalampos (Babis) Papamanthou Department of Electrical and Computer Engineering University of Maryland, College Park

More information

Summary of Data Communications

Summary of Data Communications Summary of Data Communications Nixu Oy PL 21 A REFRESHING TOUR - INCLUDES PICTURES (Mäkelänkatu 91) 00601 Helsinki, Finland tel. +358 9 478 1011 fax. +358 9 478 1030 info@nixu.fi http://www.nixu.fi Network

More information

OSI Transport Layer. Network Fundamentals Chapter 4. Version Cisco Systems, Inc. All rights reserved. Cisco Public 1

OSI Transport Layer. Network Fundamentals Chapter 4. Version Cisco Systems, Inc. All rights reserved. Cisco Public 1 OSI Transport Layer Network Fundamentals Chapter 4 Version 4.0 1 Transport Layer Role and Services Transport layer is responsible for overall end-to-end transfer of application data 2 Transport Layer Role

More information

TCP /IP Fundamentals Mr. Cantu

TCP /IP Fundamentals Mr. Cantu TCP /IP Fundamentals Mr. Cantu OSI Model and TCP/IP Model Comparison TCP / IP Protocols (Application Layer) The TCP/IP subprotocols listed in this layer are services that support a number of network functions:

More information

Lecture 33. Firewalls. Firewall Locations in the Network. Castle and Moat Analogy. Firewall Types. Firewall: Illustration. Security April 15, 2005

Lecture 33. Firewalls. Firewall Locations in the Network. Castle and Moat Analogy. Firewall Types. Firewall: Illustration. Security April 15, 2005 Firewalls Lecture 33 Security April 15, 2005 Idea: separate local network from the Internet Trusted hosts and networks Intranet Firewall DMZ Router Demilitarized Zone: publicly accessible servers and networks

More information

Network Layer. The Network Layer. Contents Connection-Oriented and Connectionless Service. Recall:

Network Layer. The Network Layer. Contents Connection-Oriented and Connectionless Service. Recall: Network Layer The Network Layer Recall: The network layer is responsible for the routing of packets The network layer is responsible for congestion control 1 2 Contents 4.1.1 Connection-Oriented and Connectionless

More information

E&CE 358: Tutorial 1. Instructor: Sherman (Xuemin) Shen TA: Miao Wang

E&CE 358: Tutorial 1. Instructor: Sherman (Xuemin) Shen TA: Miao Wang E&CE 358: Tutorial 1 Instructor: Sherman (Xuemin) Shen TA: Miao Wang Email: m59wang@uwaterloo.ca 1 About Tutorials TA: Miao Wang Office: EIT 3133; Tutorials: Th 4:30 5:20 pm Topics Supplementary knowledge

More information

Protocol Layers & Wireshark TDTS11:COMPUTER NETWORKS AND INTERNET PROTOCOLS

Protocol Layers & Wireshark TDTS11:COMPUTER NETWORKS AND INTERNET PROTOCOLS Protocol Layers & Wireshark TDTS11:COMPUTER NETWORKS AND INTERNET PROTOCOLS Mail seban649@student.liu.se Protocol Hi Hi Got the time? 2:00 time TCP connection request TCP connection response Whats

More information

To make a difference between logical address (IP address), which is used at the network layer, and physical address (MAC address),which is used at

To make a difference between logical address (IP address), which is used at the network layer, and physical address (MAC address),which is used at To make a difference between logical address (IP address), which is used at the network layer, and physical address (MAC address),which is used at the data link layer. To describe how the mapping of a

More information

Fundamentals of Computer Networking AE6382

Fundamentals of Computer Networking AE6382 Computer networks are an integral part of the modern computing infrastructure The local network (LAN) is usually Ethernet LAN s are inter-connected with other LAN s in a hierarchical fashion eventually

More information

CMPE150 Midterm Solutions

CMPE150 Midterm Solutions CMPE150 Midterm Solutions Question 1 Packet switching and circuit switching: (a) Is the Internet a packet switching or circuit switching network? Justify your answer. The Internet is a packet switching

More information

Lecture 8. Reminder: Homework 3, Programming Project 2 due on Thursday. Questions? Tuesday, September 20 CS 475 Networks - Lecture 8 1

Lecture 8. Reminder: Homework 3, Programming Project 2 due on Thursday. Questions? Tuesday, September 20 CS 475 Networks - Lecture 8 1 Lecture 8 Reminder: Homework 3, Programming Project 2 due on Thursday. Questions? Tuesday, September 20 CS 475 Networks - Lecture 8 1 Outline Chapter 3 - Internetworking 3.1 Switching and Bridging 3.2

More information

Chapter 5 OSI Network Layer

Chapter 5 OSI Network Layer Chapter 5 OSI Network Layer The protocols of the OSI model Network layer specify addressing and processes that enable Transport layer data to be packaged and transported. The Network layer encapsulation

More information

CCNA Exploration Network Fundamentals. Chapter 04 OSI Transport Layer

CCNA Exploration Network Fundamentals. Chapter 04 OSI Transport Layer CCNA Exploration Network Fundamentals Chapter 04 OSI Transport Layer Updated: 05/05/2008 1 4.1 Roles of the Transport Layer 2 4.1 Roles of the Transport Layer The OSI Transport layer accept data from the

More information

CS 4390 Computer Networks. Transport Services and Protocols

CS 4390 Computer Networks. Transport Services and Protocols CS 4390 Computer Networks UT D data Session 07 Transport Layer Overview and UDP Adapted from Computer Networking a Top-Down Approach 1996-2012 by J.F Kurose and K.W. Ross, All Rights Reserved Transport

More information

1-1. Switching Networks (Fall 2010) EE 586 Communication and. October 25, Lecture 24

1-1. Switching Networks (Fall 2010) EE 586 Communication and. October 25, Lecture 24 EE 586 Communication and Switching Networks (Fall 2010) Lecture 24 October 25, 2010 1-1 Announcements Midterm 1: Mean = 92.2 Stdev = 8 Still grading your programs (sorry about the delay) Network Layer

More information

NETWORK PACKET ANALYSIS PROGRAM

NETWORK PACKET ANALYSIS PROGRAM NETWORK PACKET ANALYSIS PROGRAM Duration: 3 days (21 hours) Mode: 1. Instructor Led Class room Training and Labs 2. Online In this hands-on course, you will receive in-depth training on Protocol analysis

More information

Networks Fall This exam consists of 10 problems on the following 13 pages.

Networks Fall This exam consists of 10 problems on the following 13 pages. CSCI 466 Final Networks Fall 2011 Name: This exam consists of 10 problems on the following 13 pages. You may use your two- sided hand- written 8 ½ x 11 note sheet during the exam and a calculator. No other

More information

CSC 574 Computer and Network Security. TCP/IP Security

CSC 574 Computer and Network Security. TCP/IP Security CSC 574 Computer and Network Security TCP/IP Security Alexandros Kapravelos kapravelos@ncsu.edu (Derived from slides by Will Enck and Micah Sherr) Network Stack, yet again Application Transport Network

More information

CS 457 Lecture 11 More IP Networking. Fall 2011

CS 457 Lecture 11 More IP Networking. Fall 2011 CS 457 Lecture 11 More IP Networking Fall 2011 IP datagram format IP protocol version number header length (bytes) type of data max number remaining hops (decremented at each router) upper layer protocol

More information

TCP/IP Protocol Suite and IP Addressing

TCP/IP Protocol Suite and IP Addressing TCP/IP Protocol Suite and IP Addressing CCNA 1 v3 Module 9 10/11/2005 NESCOT CATC 1 Introduction to TCP/IP U.S. DoD created the TCP/IP model. Provides reliable data transmission to any destination under

More information

Fundamentals of Networking. OSI & TCP/IP Model. Kuldeep Sonar 1

Fundamentals of Networking. OSI & TCP/IP Model. Kuldeep Sonar 1 Fundamentals of Networking OSI & TCP/IP Model Kuldeep Sonar 1 Kuldeep Sonar 2 OSI Model Kuldeep Sonar 3 Application Layer Layer 7 provides an interface between a host s communication software and any necessary

More information

Lecture (02) The TCP/IP Networking Model

Lecture (02) The TCP/IP Networking Model Lecture (02) The TCP/IP Networking Model Dr. Ahmed M. ElShafee ١ Agenda Introduction to networking architecture Historical background The TCP/IP Protocol Architecture The TCP/IP Application Layer The TCP/IP

More information

CSCI 680: Computer & Network Security

CSCI 680: Computer & Network Security CSCI 680: Computer & Network Security Lecture 15 Prof. Adwait Nadkarni Fall 2017 Derived from slides by William Enck and Micah Sherr 1 Grading Class Participat ion and Quizzes 10% Grade Breakdown Homewo

More information

( A ) 1. WAP is a (A) protocol (B) hardware (C) software (D) network architecture

( A ) 1. WAP is a (A) protocol (B) hardware (C) software (D) network architecture CS 742 Computer Communication Networks Final Exam - Name: Fall 2003 Part 1: (75 points - 3 points for each problem) ( A ) 1. WAP is a (A) protocol (B) hardware (C) software (D) network architecture ( C

More information

NT1210 Introduction to Networking. Unit 10

NT1210 Introduction to Networking. Unit 10 NT1210 Introduction to Networking Unit 10 Chapter 10, TCP/IP Transport Objectives Identify the major needs and stakeholders for computer networks and network applications. Compare and contrast the OSI

More information

TCP/IP Protocol Suite

TCP/IP Protocol Suite TCP/IP Protocol Suite Computer Networks Lecture 5 http://goo.gl/pze5o8 TCP/IP Network protocols used in the Internet also used in today's intranets TCP layer 4 protocol Together with UDP IP - layer 3 protocol

More information

ECE4110 Internetwork Programming. Introduction and Overview

ECE4110 Internetwork Programming. Introduction and Overview ECE4110 Internetwork Programming Introduction and Overview 1 EXAMPLE GENERAL NETWORK ALGORITHM Listen to wire Are signals detected Detect a preamble Yes Read Destination Address No data carrying or noise?

More information

CCNA Exploration1 Chapter 7: OSI Data Link Layer

CCNA Exploration1 Chapter 7: OSI Data Link Layer CCNA Exploration1 Chapter 7: OSI Data Link Layer LOCAL CISCO ACADEMY ELSYS TU INSTRUCTOR: STELA STEFANOVA 1 Explain the role of Data Link layer protocols in data transmission; Objectives Describe how the

More information

(Refer Slide Time: 1:09)

(Refer Slide Time: 1:09) Computer Networks Prof. S. Ghosh Department of Computer Science and Engineering Indian Institute of Technology, Kharagpur Lecturer # 30 UDP and Client Server Good day, today we will start our discussion

More information

TSIN02 - Internetworking

TSIN02 - Internetworking Lecture 4: Outline Literature: Lecture 4: Transport Layer Forouzan: ch 11-12 RFC? Transport layer introduction UDP TCP 2004 Image Coding Group, Linköpings Universitet 2 The Transport Layer Transport layer

More information

Address Resolution Protocol (ARP), RFC 826

Address Resolution Protocol (ARP), RFC 826 Address Resolution Protocol (ARP), RFC 826 Prof. Lin Weiguo Copyleft 2009~2017, School of Computing, CUC Sept. 2017 ARP & RARP } Note: } The Internet is based on IP addresses } Data link protocols (Ethernet,

More information

CMPE 80N: Introduction to Networking and the Internet

CMPE 80N: Introduction to Networking and the Internet CMPE 80N: Introduction to Networking and the Internet Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 11 CMPE 80N Fall'10 1 Announcements Forum #2 due on 11.05. CMPE 80N Fall'10 2 Last

More information

The Client Server Model and Software Design

The Client Server Model and Software Design The Client Server Model and Software Design Prof. Chuan-Ming Liu Computer Science and Information Engineering National Taipei University of Technology Taipei, TAIWAN MCSE Lab, NTUT, TAIWAN 1 Introduction

More information

Chapter -4 OSI Reference Model

Chapter -4 OSI Reference Model Chapter -4 OSI Reference Model Objectives Concept of Reference Model. OSI Reference Model Concept. Layers of OSI Reference Model. 4.1 Introduction Layered Architecture, Peer-to- Peer Processes, Interfaces

More information

Introduction to TCP/IP networking

Introduction to TCP/IP networking Introduction to TCP/IP networking TCP/IP protocol family IP : Internet Protocol UDP : User Datagram Protocol RTP, traceroute TCP : Transmission Control Protocol HTTP, FTP, ssh What is an internet? A set

More information

06/02/ Local & Metropolitan Area Networks 0. INTRODUCTION. 1. History and Future of TCP/IP ACOE322

06/02/ Local & Metropolitan Area Networks 0. INTRODUCTION. 1. History and Future of TCP/IP ACOE322 1 Local & Metropolitan Area Networks ACOE322 Lecture 5 TCP/IP Protocol suite and IP addressing 1 0. INTRODUCTION We shall cover in this topic: 1. The relation of TCP/IP with internet and OSI model 2. Internet

More information

On Distributed Communications, Rand Report RM-3420-PR, Paul Baran, August

On Distributed Communications, Rand Report RM-3420-PR, Paul Baran, August The requirements for a future all-digital-data distributed network which provides common user service for a wide range of users having different requirements is considered. The use of a standard format

More information

CIT 380: Securing Computer Systems. Network Security Concepts

CIT 380: Securing Computer Systems. Network Security Concepts CIT 380: Securing Computer Systems Network Security Concepts Topics 1. Protocols and Layers 2. Layer 2 Network Concepts 3. MAC Spoofing 4. ARP 5. ARP Spoofing 6. Network Sniffing Protocols A protocol defines

More information

exam. Number: Passing Score: 800 Time Limit: 120 min CISCO Interconnecting Cisco Networking Devices Part 1 (ICND)

exam. Number: Passing Score: 800 Time Limit: 120 min CISCO Interconnecting Cisco Networking Devices Part 1 (ICND) 100-105.exam Number: 100-105 Passing Score: 800 Time Limit: 120 min CISCO 100-105 Interconnecting Cisco Networking Devices Part 1 (ICND) Exam A QUESTION 1 Which route source code represents the routing

More information

network security s642 computer security adam everspaugh

network security s642 computer security adam everspaugh network security s642 adam everspaugh ace@cs.wisc.edu computer security today Announcement: HW3 to be released WiFi IP, TCP DoS, DDoS, prevention 802.11 (wifi) STA = station AP = access point BSS = basic

More information

Lecture #9 Introduction to communication networks

Lecture #9 Introduction to communication networks KTH ROYAL INSTITUTE OF TECHNOLOGY Lecture #9 Introduction to communication networks Nicholas Honeth In this series Lecture #9 Communication protocol basics Relationship between OSI and

More information

CS-435 spring semester Network Technology & Programming Laboratory. Stefanos Papadakis & Manolis Spanakis

CS-435 spring semester Network Technology & Programming Laboratory. Stefanos Papadakis & Manolis Spanakis CS-435 spring semester 2016 Network Technology & Programming Laboratory University of Crete Computer Science Department Stefanos Papadakis & Manolis Spanakis CS-435 Lecture #4 preview ICMP ARP DHCP NAT

More information

Computer Networks Security: intro. CS Computer Systems Security

Computer Networks Security: intro. CS Computer Systems Security Computer Networks Security: intro CS 166 - Computer Systems Security A very easy network 3/14/16 Computer Networks: Intro 2 Two philosophers example Translator Language Translator Engineer Communication

More information

ECE 4400:427/527 - Computer Networks Spring 2017

ECE 4400:427/527 - Computer Networks Spring 2017 ECE 4400:427/527 - Computer Networks Spring 2017 Dr. Nghi Tran Department of Electrical & Computer Engineering Lecture 3: Network Architectures Dr. Nghi Tran (ECE-University of Akron) ECE 4400:427/527

More information

OSI Network Layer. Chapter 5

OSI Network Layer. Chapter 5 OSI Network Layer Network Fundamentals Chapter 5 Objectives Identify the role of the Network Layer, as it describes communication from one end device to another end device. Examine the most common Network

More information

Network and Security: Introduction

Network and Security: Introduction Network and Security: Introduction Seungwon Shin KAIST Some slides are from Dr. Srinivasan Seshan Some slides are from Dr. Nick Mckeown Network Overview Computer Network Definition A computer network or

More information

Introduction to computer networking

Introduction to computer networking edge core Introduction to computer networking Comp Sci 3600 Security Outline edge core 1 2 edge 3 core 4 5 6 The edge core Outline edge core 1 2 edge 3 core 4 5 6 edge core Billions of connected computing

More information

User Datagram Protocol (UDP):

User Datagram Protocol (UDP): SFWR 4C03: Computer Networks and Computer Security Feb 2-5 2004 Lecturer: Kartik Krishnan Lectures 13-15 User Datagram Protocol (UDP): UDP is a connectionless transport layer protocol: each output operation

More information

Network Layer: Internet Protocol

Network Layer: Internet Protocol Network Layer: Internet Protocol Motivation Heterogeneity Scale Intering IP is the glue that connects heterogeneous s giving the illusion of a homogenous one. Salient Features Each host is identified by

More information

TSIN02 - Internetworking

TSIN02 - Internetworking Lecture 2: The Internet Protocol Literature: Forouzan: ch 4-9 and ch 27 2004 Image Coding Group, Linköpings Universitet Outline About the network layer Tasks Addressing Routing Protocols 2 Tasks of the

More information

OSI Reference Model. Computer Networks lab ECOM Prepared By : Eng. Motaz Murtaja Eng. Ola Abd Elatief

OSI Reference Model. Computer Networks lab ECOM Prepared By : Eng. Motaz Murtaja Eng. Ola Abd Elatief Islamic University of Gaza Faculty of Engineering Computer Engineering Department Computer Networks lab ECOM 4121 OSI Reference Model Prepared By : Eng. Motaz Murtaja Eng. Ola Abd Elatief May /2010 OSI

More information

Overview of Ethernet Networking

Overview of Ethernet Networking Overview of Ethernet Networking Renesas Electronics America Inc. 1/31/2011 Rev. 0.02 00000-A Agenda This course contains an overview of Ethernet technology and its advantages and limits. Contained in this

More information

Module 7: Configuring and Supporting TCP/IP

Module 7: Configuring and Supporting TCP/IP Module 7: Configuring and Supporting TCP/IP Contents Overview 1 Introduction to TCP/IP 2 Examining Classful IP Addressing 10 Defining Subnets 17 Using Classless Inter-Domain Routing 29 Configuring IP Addresses

More information

TSIN02 - Internetworking

TSIN02 - Internetworking Literature: Lecture 10: AAA RFC3286 RFC2881 RFC2905 RFC2903 Lecture 10: AAA Goals: 2004 Image Coding Group, Linköpings Universitet 2 Lecture 10: AAA AAA Introduction Outline: AAA introduction AAA in Network

More information

Part 5: Link Layer Technologies. CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross

Part 5: Link Layer Technologies. CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross Part 5: Link Layer Technologies CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross 1 Outline PPP ATM X.25 Frame Relay 2 Point to Point Data Link Control One sender, one receiver,

More information

Chapter 1: Introducing TCP/IP

Chapter 1: Introducing TCP/IP Chapter 1: Introducing TCP/IP Understand TCP/IP s origins and history Explain the process by which TCP/IP standards and other documents, called Requests for Comments (RFCs), are created, debated, and formalized

More information

Hands-On IP for TeleCom Technicians Internetworking, TCP/IP, VLANS, Wirelss and more...

Hands-On IP for TeleCom Technicians Internetworking, TCP/IP, VLANS, Wirelss and more... Hands-On Internetworking, TCP/IP, VLANS, Wirelss 802.11 and more... Course Description The Internet Protocol Suite, commonly known as TCP/IP, forms the basis for the Internet and the next generation of

More information

Networking Fundamentals

Networking Fundamentals Networking Fundamentals Network Startup Resource Center www.nsrc.org These materials are licensed under the Creative Commons Attribution-NonCommercial 4.0 International license (http://creativecommons.org/licenses/by-nc/4.0/)

More information

Chapter 11: Wide-Area Networks and the Internet

Chapter 11: Wide-Area Networks and the Internet Chapter 11: Wide-Area Networks and the Internet MULTIPLE CHOICE 1. MAN stands for: a. Manchester Access Network c. Metropolitan-Area Network b. Multiple-Area Network d. Multiple Access Network 2. Packet

More information

Operating Systems CS 571

Operating Systems CS 571 Computer Networks: Overview Operating Systems CS 571 Network types Range Bandwidth (Mbps) Latency (ms) LAN 1-2 kms 10-1000 1-10 WAN worldwide 0.010-600 100-500 MAN 2-50 kms 1-150 10 Wireless LAN 0.15-1.5

More information

Chapter 7 Internet Protocol Version 4 (IPv4) Kyung Hee University

Chapter 7 Internet Protocol Version 4 (IPv4) Kyung Hee University Chapter 7 Internet Protocol Version 4 (IPv4) 1 7.1 Introduction The transmission mechanism used by the TCP/IP Unreliable and connectionless datagram protocol Best-effort delivery service IP packets can

More information

Novell. NetWare 6. TCP/IP ADMINISTRATION GUIDE

Novell. NetWare 6.  TCP/IP ADMINISTRATION GUIDE Novell NetWare 6 www.novell.com TCP/IP ADMINISTRATION GUIDE Legal Notices Novell, Inc. makes no representations or warranties with respect to the contents or use of this documentation, and specifically

More information

Chapter 7 Transport Layer. 7.0 Introduction 7.1 Transport Layer Protocols 7.2 TCP and UDP 7.3 Summary

Chapter 7 Transport Layer. 7.0 Introduction 7.1 Transport Layer Protocols 7.2 TCP and UDP 7.3 Summary Chapter 7 Transport Layer 7.0 Introduction 7.1 Transport Layer Protocols 7.2 TCP and UDP 7.3 Summary Transport Layer Transportation of Data Role of the Transport Layer The transport layer is responsible

More information

What is a Network? TCP / IP. The ISO OSI Model. Protocols. The TCP/IP Protocol Suite. The TCP/IP Protocol Suite. Computer network.

What is a Network? TCP / IP. The ISO OSI Model. Protocols. The TCP/IP Protocol Suite. The TCP/IP Protocol Suite. Computer network. What is a Network? TCP / IP Computer network a set of computers using common protocols to communicate over connecting transmission media. Protocol a formal description of message formats and the rules

More information

R (2) Implementation of following spoofing assignments using C++ multi-core Programming a) IP Spoofing b) Web spoofing.

R (2) Implementation of following spoofing assignments using C++ multi-core Programming a) IP Spoofing b) Web spoofing. R (2) N (5) Oral (3) Total (10) Dated Sign Experiment No: 1 Problem Definition: Implementation of following spoofing assignments using C++ multi-core Programming a) IP Spoofing b) Web spoofing. 1.1 Prerequisite:

More information

Homework 4 assignment for ECE374 Posted: 04/06/15 Due: 04/13/15

Homework 4 assignment for ECE374 Posted: 04/06/15 Due: 04/13/15 ECE374: Homework 4 1 Homework 4 assignment for ECE374 Posted: 04/06/15 Due: 04/13/15 Note: In all written assignments, please show as much of your work as you can. Even if you get a wrong answer, you can

More information

Imi :... Data:... Nazwisko:... Stron:...

Imi :... Data:... Nazwisko:... Stron:... Imi :.................................................... Data:....................... Nazwisko:............................................... Stron:...................... 1. Which of the following protocols

More information

CS 458 Internet Engineering Spring First Exam

CS 458 Internet Engineering Spring First Exam CS 458 Internet Engineering Spring 2005 First Exam Instructions (read carefully): There are 6 problems for a total of 60 points. This is a closed book and closed notes in-class exam. If any problem is

More information

CSCI Networking Name:

CSCI Networking Name: CSCI 3335- Networking Name: Final Exam Problem 1: Error Checking and TCP (15 Points) (a) True or false: [2.5 points for circling correct answers, -1 points for each wrong answer] i. CRC can both correct

More information

TCP/IP Networking. Part 4: Network and Transport Layer Protocols

TCP/IP Networking. Part 4: Network and Transport Layer Protocols TCP/IP Networking Part 4: Network and Transport Layer Protocols Orientation Application Application protocol Application TCP TCP protocol TCP IP IP protocol IP IP protocol IP IP protocol IP Network Access

More information

The SpaceWire Transport Protocol. Stuart Mills, Steve Parkes University of Dundee. International SpaceWire Seminar 5 th November 2003

The SpaceWire Transport Protocol. Stuart Mills, Steve Parkes University of Dundee. International SpaceWire Seminar 5 th November 2003 The SpaceWire Transport Protocol Stuart Mills, Steve Parkes University of Dundee International SpaceWire Seminar 5 th November 2003 Introduction Background The Protocol Stack, TCP/IP, SCPS CCSDS and SOIF

More information

Lab - Using Wireshark to Examine a UDP DNS Capture

Lab - Using Wireshark to Examine a UDP DNS Capture Topology Objectives Part 1: Record a PC s IP Configuration Information Part 2: Use Wireshark to Capture DNS Queries and Responses Part 3: Analyze Captured DNS or UDP Packets Background / Scenario If you

More information