Client Server Concepts, DNS, Telnet, FTP
|
|
- Laurel Mason
- 6 years ago
- Views:
Transcription
1 Indian Institute of Technology Kharagpur Client Server Concepts, DNS, Telnet, FTP Prof. Indranil Sen Gupta Dept. of Computer Science & Engg. I.I.T. Kharagpur, INDIA Lecture 9: Client server concepts, DNS, Telnet, FTP On completion, the student will be able to: 1. Explain how the client-server concept works. 2. Explain and illustrate the name resolution process used by DNS servers. 3. Explain how the Telnet and FTP protocol works. 4. Demonstrate usage of Telnet and FTP commands. 1
2 Client-server Model Standard model for developing network applications. Notion of client and server. A server is a process that is offering some service. A client is a process that is requesting the service. Server or client may be running on different machines. Server waits for requests from client(s). Client-server Model (contd.) CLIENT SERVER CLIENT CLIENT 2
3 Client-server Model (contd.) Typical scenario: The server process starts on some computer system. Initializes itself, then goes to sleep waiting for a client request. A client process starts, either on the same system or on some other system. Sends a request to the server. When the server process has finished providing its service to the client, the server goes back to sleep, waiting for the next client request to arrive. The process repeats. 3
4 Client-server Model (contd.) Roles of the client and the server processes are asymmetric. Two types of servers: Iterative servers. Concurrent servers. Iterative Servers Used when the server process knows in advance how long it takes to handle each request and it handles each request itself. Single copy of server runs at all times. A client may have to wait if the server is busy. 4
5 Concurrent Servers Used when the amount of work required to handle a request is unknown; the server starts another process to handle each request. A copy of the server caters to a client s request in a dedicated fashion. As many copies of server as there are client requests. Using TCP or UDP Before start of communication, a connection has to be established between the two hosts. Five components in a connection: Protocol used Source IP address Source port number Destination IP address Destination port number 5
6 Develop a Network Application The best way is to use some standard and well-accepted protocol. At the data link layer level, use Ethernet. At the network layer level, use IP. At the transport layer level, use TCP. At the application layer level, use a standard API like the Berkeley Socket Interface. What is a Socket? The socket is the BSD method for achieving inter-process communication (IPC). It is used to allow one process to speak to another (on same or different machine). Analogy: Like the telephone is used to allow one person to speak to another. 6
7 Basic Idea When two processes located on two machines communicate, we define association and socket. Association: basically a 5-tuple Protocol Local IP address Local port number Remote IP address Remote port number Socket: also called half-association (a 3-tuple) Protocol, local IP address, local port number Protocol, remote IP address, remote port number 7
8 Domain Name System (DNS) What is DNS? The global database system for Internet addressing, mail and other information. Much easier to use and memorize. Concept of domains and sub-domains. Domain management is distributed. DNS servers translate domain names to IP addresses. 8
9 Top Level Domains com Commercial org Non-profit net Network service provider gov US govt. mil military edu Education au Australian at Austrian ca Canadian dk Dutch fr French de German in Indian it Italian jp Japanese kr Korean nz New Zealand es Spanish tw Taiwanese uk British or Irish us U.S. Domain Name Structure Domain names are arranged in a hierarchical tree-like structure. ernet iitkgp cse ece mech in iitb cse math nic Eg: cse.iitkgp.ernet.in 9
10 Some Statistics In thousands Year COM EDU GOV MIL NET ORG ,200 1, ,400 1, Name Resolution Process The commonly used server is BIND (Berkeley Internal Name Domain). Runs under UNIX as a process called named. When an application needs some information from the server, it invokes the DNS name resolver. DNS translates a fully qualified domain name into the corresponding IP address. Using the command nslookup. 10
11 If the name server does not have the information locally, it asks its primary server, and so on. For redundancy, each host may also have one or more secondary name servers which may be queried when the primary fails. How do name servers update themselves? Hierarchy of Name Servers root au edu com in stanford.edu gatech.edu rediff.com yahoo.com 11
12 Recursive Name Resolution root edu com client stanford.edu yahoo.com Iterative Name Resolution Client sequentially sends queries to DNS servers and receives response. If response is negative, the DNS server to query next is also returned. Unlike recursive name resolution, where only one response is finally returned back to the client. 12
13 TELNET Protocol TELNET Allows a person sitting on one computer to work on another computer. Starts a remote session on another machine. Requires a person to supply login name and password to gain entry. Command: A B telnet <domain_name> telnet <ip_address> 13
14 TELNET (contd.) Why required? For using software only available on the remote host. For using devices (like printer) connected to the remote host. Typical scenario Many users do a telnet to a remote server, and work there. Server is a bigger and faster computer. TELNET (contd.) By default connection is established over port 23. Any other port number can also be specified. telnet cse.iitkgp.ernet.in 25 14
15 A Sample TELNET Session SUNNY>> telnet cse Trying Connected to cse. Escape character is '^]'. Linux (cse) (ttyp0) cse login: isg Password: Last login: Wed Jun 11 12:17:55 from Linux (POSIX). You have new mail. cse:~$ FTP Protocol 15
16 File Transfer Protocol (FTP) Allows a person to transfer files between two machines. Requires a person to supply login name and password to gain entry. Command: ftp <domain_name> ftp <ip_address> Anonymous FTP A special form of FTP which has become very popular. Does not require a person to know login name and password. In place of login name, type the word anonymous. In place of password, type the address. Huge amount of resources are available in anonymous FTP sites. 16
17 FTP Process Model CLIENT Data Transfer SERVER Data Transfer Control Control Port 21 Port 22 INTERNET How FTP Works? Two connections established: A control connection over port 21, that remains all through a session. A temporary port number, used for every file being transferred. New connection established for every file transfer. 17
18 Typical FTP Commands put, mput Send one (or more) file(s). get, mget Receive one (or more) file(s). hash Indicates progress of file transfer. prompt Prompts user before actual transfer of each file. bin, asc Selects binary or ascii mode of transfer. exit Terminates connection with ftp server. Sample FTP Sessions SUNNY>> ftp cseindigo Connected to cseindigo. 220 cseindigo FTP server ready. Name (cseindigo:isg): isg 331 Password required for isg. Password: 230 User isg logged in. Remote system type is UNIX. Using binary mode to transfer files. ftp> 18
19 Sample FTP Sessions (contd.) ftp> dir 200 PORT command successful. 150 Opening ASCII mode data connection for '/bin/ls'. total 97 drwxr-xr-x 2 isg faculty 512 Oct PROJECTS -rw-r--r-- 1 isg faculty 7693 Mar lan-cse.fig -rw-r--r-- 1 isg faculty 6578 Apr lan-cse.fig -rw-r--r-- 1 isg faculty 6721 Jul newlan.fig 226 Transfer complete. Sample FTP Sessions (contd.) ftp> get lan-cse.fig 200 PORT command successful. 150 Opening BINARY mode data connection for 'lan-cse.fig' (6721 bytes). 226 Transfer complete bytes received in secs (1.7e+02 Kbytes/sec) ftp> quit 221 Goodbye. SUNNY>> 19
20 SOLUTIONS TO QUIZ QUESTIONS ON LECTURE 8 20
21 Quiz Solutions on Lecture 8 1. What are the four types of BGP messages? OPEN, UPDATE, KEEPALIVE and NOTIFICATION. 2. How is a BGP connection between two routers maintained? By periodically sending the KEEPALIVE message. Quiz Solutions on Lecture 8 3. What are the main functional procedures in BGP? Neighbor acquisition, network acquisition, and network reachability. 4. Why is IPv4 not suitable for supporting real-time traffic? IPv4 does not guarantee packets to follow the same path. This leads to unequal delays and out-of-order delivery. 21
22 Quiz Solutions on Lecture 8 5. How are the (multiple) headers in a IPv6 packet kept track of? All extension headers after the mandatory base header are chained in a linked list. 6. How does IPv6 attempt to support realtime traffic? IPv6 allows a pair of stations to establish a path before sending packets. Quiz Solutions on Lecture 8 7. What does the Payload length field in the IPv6 header signify? Total length of the extension headers and the transport level protocol data unit (PDU). 8. What does the Next Header field in the IPv6 header signify? Type of information that immediately follows the current header. 22
23 Quiz Solutions on Lecture 8 9. In IPv6, how are the fragments kept track of, in case a packet is fragmented? Base header is copied into all the fragments. Presence of fragment headers in all the fragments. 10. What is anycast addressing? Packet will be delivered to exactly one of a set of computers. Quiz Solutions on Lecture How can we use tunneling to send a IPv6 packet over a IPv4 network? The entire IPv6 packet can be encapsulated as payload inside an INv4 packet. 23
24 QUIZ QUESTIONS ON LECTURE 9 Quiz Questions on Lecture 9 1. What is an iterative server? 2. What is a concurrent server? 3. Which of client or server must start first? 4. What are the components of a socket? 5. What is a domain? 6. What are named and nslookup? 7. How does recursive name resolution works? 24
25 Quiz Questions on Lecture 9 8. How can you connect to a server xyz.com over port number 1234? 9. Why does ftp use more than one port numbers for communication? 10. What are the functions of the hash and bin commands in ftp? 25
Client Server Concepts, DNS, DHCP
Client Server Concepts, DNS, DHCP Prof. I. Sengupta / Dr. S.K. Ghosh School of Information Technology Indian Institute of Technology, Kharagpur 1 Client-Server Model 2 Client-server Model Standard model
More informationInternet Routing Protocols Part II
Indian Institute of Technology Kharagpur Internet Routing Protocols Part II Prof. Indranil Sen Gupta Dept. of Computer Science & Engg. I.I.T. Kharagpur, INDIA Lecture 8: Internet routing protocols Part
More informationReview of Network Technologies
Indian Institute of Technology Kharagpur Review of Network Technologies Prof. Indranil Sen Gupta Dept. of Computer Science & Engg. I.I.T. Kharagpur, INDIA Lecture 2: Review of network technologies On completion,
More information2. Introduction to Internet Applications
2. Introduction to Internet Applications 1. Representation and Transfer 2. Web Protocols 3. Some Other Application Layer Protocols 4. Uniform Resource Identifiers (URIs) 5. Uniform Resource Locators (URLs)
More informationNetworking Basics. EC512 Spring /15/2015 EC512 - Prof. Thomas Skinner 1
Networking Basics EC512 Spring 2015 2/15/2015 EC512 - Prof. Thomas Skinner 1 Protocols Protocols are required in order to allow information to be extracted from the stream of bits flowing from one point
More informationCS155b: E-Commerce. Lecture 3: Jan 16, How Does the Internet Work? Acknowledgements: S. Bradner and R. Wang
CS155b: E-Commerce Lecture 3: Jan 16, 2001 How Does the Internet Work? Acknowledgements: S. Bradner and R. Wang Internet Protocols Design Philosophy ordered set of goals 1. multiplexed utilization of existing
More informationLecture 05 Application Layer - I
Computer Networks and Internet Protocol Prof. Soumya Kanti Ghosh Department of Computer Science and Engineering Indian Institute of Technology, Kharagpur Lecture 05 Application Layer - I Hi. So, we will
More informationQUIZ: Longest Matching Prefix
QUIZ: Longest Matching Prefix A router has the following routing table: 10.50.42.0 /24 Send out on interface Z 10.50.20.0 /24 Send out on interface A 10.50.24.0 /22 Send out on interface B 10.50.20.0 /22
More informationIntroduction to Networks and the Internet
Introduction to Networks and the Internet CMPE 80N Winter 2004 Lecture 18 Announcements Fourth quiz on Monday, March 1 st. Third HTML discussion session today by Kiran (before class). Summary posted on
More informationSystem Programming. Introduction to computer networks
Content : by Dr. B. Boufama School of Computer Science University of Windsor Instructor: Dr. A. Habed adlane@cs.uwindsor.ca http://cs.uwindsor.ca/ adlane/60-256 Content Content 1 Introduction to Computer
More informationObjectives. Upon completion you will be able to:
Domain Name System: DNS Objectives Upon completion you will be able to: Understand how the DNS is organized Know the domains in the DNS Know how a name or address is resolved Be familiar with the query
More informationManual Configuration Stateful Address Configuration (i.e. from servers) Stateless Autoconfiguration : IPv6
Manual Configuration Stateful Address Configuration (i.e. from servers) BOOTP DHCPv4, DHCPv6 Stateless Auto : IPv6 최양희서울대학교컴퓨터공학부 2005 Yanghee Choi 2 RARP Hardware address ---> IP address requires direct
More informationApplications. Chong-kwon Kim. Running in end systems (hosts) over transport layer protocols Ex: , Web, FTP, instant messaging
Applications Chong-kwon Kim Applications Network applications Running in end systems (hosts) over transport layer protocols Ex: e-mail, Web, FTP, instant messaging Application layer protocols Define app.
More informationIntroduction to Internet, Web, and TCP/IP Protocols SEEM
Introduction to Internet, Web, and TCP/IP Protocols SEEM 3460 1 Local-Area Networks A Local-Area Network (LAN) covers a small distance and a small number of computers LAN A LAN often connects the machines
More informationCSE 124 January 27, Winter 2017, UCSD Prof. George Porter
CSE 124 January 27, 2017 Winter 2017, UCSD Prof. George Porter Announcements Today s plan: Finish up DNS/naming Bit more detail on threading and synchronization Open discussion about Project 1 Part 1:
More informationUser Datagram Protocol(UDP)
User Datagram Protocol(UDP) UDP is a connectionless protocol. There is no mechanism for ensuring that data sent is received by the destination. Hence, it is an unreliable protocol. A unit of data sent
More informationApplication Layer: OSI and TCP/IP Models
Application Layer Application Layer: OSI and TCP/IP Models The communication process between two communicating nodes is actually a communication process between two applications on these devices. Service
More informationECS 152A Computer Networks Instructor: Liu. Name: Student ID #: Final Exam: March 17, 2005
ECS 152A Computer Networks Instructor: Liu Name: Student ID #: Final Exam: March 17, 2005 Duration: 120 Minutes 1. The exam is closed book. However, you may refer to one sheet of A4 paper (double sided)
More informationLab - 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 informationLab - 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 informationThe Internet. Overview. Network building blocks
The Internet Lecture 24 Based in part on material from Computer Networks: A Systems Approach by Larry Peterson & Bruce Davie CS 638 Web Programming Overview Network building blocks Nodes: PC, special-purpose
More informationTRANSMISSION CONTROL PROTOCOL. ETI 2506 TELECOMMUNICATION SYSTEMS Monday, 7 November 2016
TRANSMISSION CONTROL PROTOCOL ETI 2506 TELECOMMUNICATION SYSTEMS Monday, 7 November 2016 ETI 2506 - TELECOMMUNICATION SYLLABUS Principles of Telecom (IP Telephony and IP TV) - Key Issues to remember 1.
More informationNetwork+ Guide to Networks 6 th Edition. Chapter 4 Introduction to TCP/IP Protocols
Network+ Guide to Networks 6 th Edition Chapter 4 Introduction to TCP/IP Protocols Objectives Identify and explain the functions of the core TCP/IP protocols Explain the TCP/IP model and how it corresponds
More informationA DNS Tutorial
http://ntrg.cs.tcd.ie/undergrad/4ba2/multicast/ Copyright Table of Contents What is a DNS?... 3 Why do we need a DNS?... 3 Why do computers prefer addresses based on numbers?... 3 What is a Domain Name,
More informationHow does the Internet Work? The Basics: Getting a Web Page. The Basics: Getting a Web Page. Client-Server model. The Internet: Basics
How does the Internet Work? When you type a URL (Uniform Resource Locator) into a Web Browser and press Return, what do you think happens? That is, what steps do you think are required to obtain a web
More informationSC/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 informationChapter 7. Local Area Network Communications Protocols
Chapter 7 Local Area Network Communications Protocols The Network Layer The third layer of the OSI Model is the network layer. The network layer is concerned with providing a means for hosts to communicate
More informationCS4/MSc Computer Networking. Lecture 3: The Application Layer
CS4/MSc Computer Networking Lecture 3: The Application Layer Computer Networking, Copyright University of Edinburgh 2005 Network Applications Examine a popular network application: Web Client-server architecture
More informationFundamental Questions to Answer About Computer Networking, Jan 2009 Prof. Ying-Dar Lin,
Fundamental Questions to Answer About Computer Networking, Jan 2009 Prof. Ying-Dar Lin, ydlin@cs.nctu.edu.tw Chapter 1: Introduction 1. How does Internet scale to billions of hosts? (Describe what structure
More informationNetworking and Internetworking 1
Networking and Internetworking 1 Today l Networks and distributed systems l Internet architecture xkcd Networking issues for distributed systems Early networks were designed to meet relatively simple requirements
More informationMODULE: NETWORKS MODULE CODE: CAN1102C. Duration: 2 Hours 15 Mins. Instructions to Candidates:
BSc.(Hons) Computer Science with Network Security BEng (Hons) Telecommunications Cohort: BCNS/17B/FT Examinations for 2017-2018 / Semester 2 Resit Examinations for BCNS/15A/FT, BTEL/15B/FT & BTEL/16B/FT
More informationProtocol Classification
DNS and DHCP TCP/IP Suite Suite of protocols (not just TCP and IP) Main protocols TCP and UDP at the Transport Layer, and IP at the Network Layer Other protocols ICMP, ARP, Telnet, Ftp, HTTP, SMTP, SNMP
More informationThe Data Link Layer. 32 PART I Networking Basics
32 PART I Networking Basics weather station. More realistic devices use duplex mode, where all systems can send or receive with equal facility. This is often further distinguished as half-duplex (the system
More informationCS 455 Internet Architecture, Page 3 ffl By 1985, the ARPANET was heavily used and congested; the National Science Foundation (NSF) initiated the NSFN
CS 455 Internet Architecture, Page 1 Network Layer, Part 3 Internet Architecture These slides are created by Dr. Yih Huang of George Mason University. Students registered in Dr. Huang's courses at GMU
More informationIntroduction to Networking
Introduction to Networking The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs. Simplified Communications System Block
More informationAPPLICATION LAYER APPLICATION LAYER : DNS, HTTP, , SMTP, Telnet, FTP, Security-PGP-SSH.
APPLICATION LAYER : DNS, HTTP, E-mail, SMTP, Telnet, FTP, Security-PGP-SSH. To identify an entity, the Internet used the IP address, which uniquely identifies the connection of a host to the Internet.
More informationPIC 40A. Lecture 1: The Internet. Copyright 2011 Jukka Virtanen UCLA 1 03/31/14
PIC 40A Lecture 1: The Internet 03/31/14 Copyright 2011 Jukka Virtanen UCLA 1 What is the Internet? For this class we use the following definition: The Internet is a network of networks. Ok. What is a
More informationSecond Semester Examination Higher National Diploma in Information Technology First Year
Q1). Second Semester Examination -2011 Higher National Diploma in Information Technology First Year IT2004 - Introduction to Data Communication and Networks No of pages: 17 Marking Scheme a) Define Analog
More informationInformation Network Systems The application layer. Stephan Sigg
Information Network Systems The application layer Stephan Sigg Tokyo, November 15, 2012 Introduction 04.10.2012 Introduction to the internet 11.10.2012 The link layer 18.10.2012 The network layer 25.10.2012
More informationCommunication Networks
Session 2. Application and Layered Architectures Dongsoo S. Kim Electrical and Computer Engineering. Indiana U. Purdue U. Indianapolis Communication s Various services and flexibility architectures Grouping
More informationChapter 19. Domain Name System (DNS)
Chapter 19 Domain Name System (DNS) TCP/IP Protocol Suite 1 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. OBJECTIVES: To describe the purpose of DNS. To define
More informationIP ADDRESSES, NAMING, AND DNS
IP ADDRESSES, NAMING, AND DNS George Porter Apr 9, 2018 ATTRIBUTION These slides are released under an Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) Creative Commons license These
More informationPLEASE READ CAREFULLY BEFORE YOU START
Page 1 of 11 MIDTERM EXAMINATION #1 OCT. 16, 2013 COMPUTER NETWORKS : 03-60-367-01 U N I V E R S I T Y O F W I N D S O R S C H O O L O F C O M P U T E R S C I E N C E Fall 2013-75 minutes This examination
More informationReview for Internet Introduction
Review for Internet Introduction What s the Internet: Two Views View 1: Nuts and Bolts View billions of connected hosts routers and switches protocols control sending, receiving of messages network of
More informationTCP/IP Transport Layer Protocols, TCP and UDP
TCP/IP Transport Layer Protocols, TCP and UDP Learning Objectives Identify TCP header fields and operation using a Wireshark FTP session capture. Identify UDP header fields and operation using a Wireshark
More informationElectrical Engineering Department EE 400, Experiment # 4 IP Addressing and Subnetting
Electrical Engineering Department EE 400, Experiment # 4 IP Addressing and Subnetting Objectives: After this experiment, the students should be able to configure for networking, assign IP address, and
More informationIntroduction to TCP/IP
Introduction to TCP/IP Properties and characteristics of TCP/IP IPv4 IPv6 Public vs private vs APIPA/link local Static vs dynamic Client-side DNS settings Client-side DHCP Subnet mask vs CIDR Gateway TCP/IP
More informationWhat 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 informationNetworking Applications
Networking Dr. Ayman A. Abdel-Hamid College of Computing and Information Technology Arab Academy for Science & Technology and Maritime Transport 1 Outline Introduction Name Space concepts Domain Name Space
More informationComputer Networks Prof. S. Ghosh Department of Computer Science and Engineering Indian Institute of Technology, Kharagpur Lecture 28 IP Version 4
Computer Networks Prof. S. Ghosh Department of Computer Science and Engineering Indian Institute of Technology, Kharagpur Lecture 28 IP Version 4 Good day, we will talk about IP version 4 that is the internet
More informationLecture 2-ter. 2. A communication example Managing a HTTP v1.0 connection. Managing a HTTP request. transport session. Step 1 - opening transport
Lecture 2-ter. 2 A communication example Managing a HTTP v1.0 connection Managing a HTTP request User digits URL and press return (or clicks ). What happens (HTTP 1.0): 1. opens a TCP transport session
More informationECE 650 Systems Programming & Engineering. Spring 2018
ECE 650 Systems Programming & Engineering Spring 2018 Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) Tyler Bletsch Duke University Slides are adapted from Brian Rogers (Duke) Dynamic
More informationImplementing VXLAN. Prerequisites for implementing VXLANs. Information about Implementing VXLAN
This module provides conceptual information for VXLAN in general and configuration information for layer 2 VXLAN on Cisco ASR 9000 Series Router. For configuration information of layer 3 VXLAN, see Implementing
More informationLecture 18 Overview. Last Lecture. This Lecture. Next Lecture. Internet Protocol (1) Internet Protocol (2)
Last Lecture Internet Protocol (1) This Lecture Internet Protocol (2) Lecture 18 Overview Source: chapters 19.1, 19.2, 22,1 22.2, 26.6 Next Lecture Transport Control Protocol (1) Source: chapters 24.1,
More informationQuiz. Segment structure and fields Flow control (rwnd) Timeout interval. Phases transition ssthresh setting Cwnd setting
Quiz v 10/30/2013 (Wednesday), 20 mins v Midterm question (available on website) v TCP basics Segment structure and fields Flow control (rwnd) Timeout interval v TCP Congestion control Phases transition
More informationUNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE AND ENGINEERING
UNIVERSITY OF TORONTO FACULTY OF APPLIED SCIENCE AND ENGINEERING ECE361 Computer Networks Midterm March 06, 2017, 6:15PM DURATION: 80 minutes Calculator Type: 2 (non-programmable calculators) Examiner:
More informationPart 5: FTP More about this course about Internet
*:96 Overheads 2a-1 Part 5: FTP More about this course about Internet application protocols can be found at URL: http://www.dsv.su.se/jpalme/internet-course/int-appprot-kurs.html Last update: 2005-09-29
More informationINTRODUCTORY INFORMATION TECHNOLOGY COMMUNICATING OVER NETWORKS. Faramarz Hendessi
INTRODUCTORY INFORMATION TECHNOLOGY COMMUNICATING OVER NETWORKS Faramarz Hendessi INTRODUCTORY INFORMATION TECHNOLOGY Lecture 6 Fall 2010 Isfahan University of technology Dr. Faramarz Hendessi Overview
More informationCisco Cisco Certified Network Associate (CCNA)
Cisco 200-125 Cisco Certified Network Associate (CCNA) http://killexams.com/pass4sure/exam-detail/200-125 Question: 769 Refer to exhibit: Which destination addresses will be used by Host A to send data
More informationElectronic Mail. Prof. Indranil Sen Gupta. Professor, Dept. of Computer Science & Engineering Indian Institute of Technology Kharagpur
Electronic Mail Prof. Indranil Sen Gupta Professor, Dept. of Computer Science & Engineering Indian Institute of Technology Kharagpur 1 Introduction Most heavily used application on the Internet. Simple
More informationScale Yourself. Lesson 3: Introduction to Internet Technology. Computer Technology 3/13/2015
Computer Technology Lesson 3: Introduction to Internet Technology Learning Goal: Students will be able to understand the elements of a network. Scale Yourself 4 I do understand the elements of a network.
More informationThe Internet Protocol (IP)
The Internet Protocol (IP) The Blood of the Internet (C) Herbert Haas 2005/03/11 "Information Superhighway is really an acronym for 'Interactive Network For Organizing, Retrieving, Manipulating, Accessing
More informationLecture 17 Overview. Last Lecture. Wide Area Networking (2) This Lecture. Internet Protocol (1) Source: chapters 2.2, 2.3,18.4, 19.1, 9.
Lecture 17 Overview Last Lecture Wide Area Networking (2) This Lecture Internet Protocol (1) Source: chapters 2.2, 2.3,18.4, 19.1, 9.2 Next Lecture Internet Protocol (2) Source: chapters 19.1, 19.2, 22,1
More informationComputer Networks. Lecture 9 Network and transport layers, IP, TCP, UDP protocols
Computer Networks Lecture 9 Network and transport layers, IP, TCP, UDP protocols Network layer The Network layer, or OSI Layer 3, provides services to exchange the individual pieces of data over the network
More informationICS 351: Networking Protocols
ICS 351: Networking Protocols IP packet forwarding application layer: DNS, HTTP transport layer: TCP and UDP network layer: IP, ICMP, ARP data-link layer: Ethernet, WiFi 1 Networking concepts each protocol
More informationData Communication Prof. A. Pal Department of Computer Science & Engineering Indian Institute of Technology, Kharagpur Lecture 34 TCP/ IP I
Data Communication Prof. A. Pal Department of Computer Science & Engineering Indian Institute of Technology, Kharagpur Lecture 34 TCP/ IP I Hello and welcome to today s lecture on TCP/IP. (Refer Slide
More informationLecture A4 Network / Internet. Computing and Art : Nature, Power, and Limits CC 3.12: Fall 2007
Lecture A4 Network / Internet Computing and Art : Nature, Power, and Limits CC 3.12: Fall 2007 Instructor Functionalia Chipp Jansen, chipp@sci.brooklyn.cuny.edu Course Web Page http://www.sci.brooklyn.cuny.edu/~chipp/cc3.12/
More informationPolitecnico di Milano Scuola di Ingegneria Industriale e dell Informazione. 09 Intranetting. Fundamentals of Communication Networks
Politecnico di Milano Scuola di Ingegneria Industriale e dell Informazione 09 Intranetting Fundamentals of Communication Networks 1 Private networks and Intranets EG subnet IG IG Private network IG o Private
More informationIPv6: An Introduction
Outline IPv6: An Introduction Dheeraj Sanghi Department of Computer Science and Engineering Indian Institute of Technology Kanpur dheeraj@iitk.ac.in http://www.cse.iitk.ac.in/users/dheeraj Problems with
More information5. Write a capture filter for question 4.
Pre-Lab 2: Single Segment IP Networks 1. Review Linux man pages for arp at www.linuxmanpages.com (in both Sections 7 and 8), the ARP RFC (RFC 826) at www.ietf.org, and Section 3.4 of the IBM Red Book.
More informationEECS 122: Introduction to Computer Networks DNS and WWW. Internet Names & Addresses
EECS 122: Introduction to Computer Networks DNS and WWW Computer Science Division Department of Electrical Engineering and Computer Sciences University of California, Berkeley Berkeley, CA 94720-1776 Internet
More informationChapter 4 Network Layer: The Data Plane
Chapter 4 Network Layer: The Data Plane A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see
More informationExperiment 2: Wireshark as a Network Protocol Analyzer
Experiment 2: Wireshark as a Network Protocol Analyzer Learning Objectives: To become familiarized with the Wireshark application environment To perform basic PDU capture using Wireshark To perform basic
More informationNetwork Layer: Control/data plane, addressing, routers
Network Layer: Control/data plane, addressing, routers CS 352, Lecture 10 http://www.cs.rutgers.edu/~sn624/352-s19 Srinivas Narayana (heavily adapted from slides by Prof. Badri Nath and the textbook authors)
More informationReview. Some slides are in courtesy of J. Kurose and K. Ross
Review The Internet (IP) Protocol Datagram format IP fragmentation ICMP: Internet Control Message Protocol NAT: Network Address Translation Routing in the Internet Intra-AS routing: RIP and OSPF Inter-AS
More informationIntroduction to IPv6. Unit -2. Prepared By:- NITIN PANDYA Assistant Professor, SVBIT.
Introduction to IPv6 Unit -2 Prepared By:- NITIN PANDYA Assistant Professor, SVBIT. IP Network Addressing INTERNET world s largest public data network, doubling in size every nine months IPv4, defines
More informationCS 3516: Computer Networks
Welcome to CS 3516: Computer Networks Prof. Yanhua Li Time: 9:00am 9:50am M, T, R, and F Location: AK 219 Fall 2018 A-term 1 Some slides are originally from the course materials of the textbook Computer
More informationINTERNET ARCHITECTURE & PROTOCOLS
INTERNET ARCHITECTURE & PROTOCOLS Set # 01 Delivered By: Engr Tahir Niazi What is Internet? Basically it is called Network of networks Nuts and Bolts (Pieces of internet) Services description (applications)
More informationNetwork Reference Models
Network Reference Models LECTURE (2) Network Reference Models A framework (guideline) for network implementation and troubleshooting. Divides complex functions into simpler components. Importance of reference
More informationData Center Configuration. 1. Configuring VXLAN
Data Center Configuration 1. 1 1.1 Overview Virtual Extensible Local Area Network (VXLAN) is a virtual Ethernet based on the physical IP (overlay) network. It is a technology that encapsulates layer 2
More informationNetwork Layer (1) Networked Systems 3 Lecture 8
Network Layer (1) Networked Systems 3 Lecture 8 Role of the Network Layer Application Application The network layer is the first end-to-end layer in the OSI reference model Presentation Session Transport
More informationTCP/IP Networking Basics
TCP/IP Networking Basics 1 A simple TCP/IP Example A user on host argon.tcpip-lab.edu ( Argon ) makes a web access to URL http://neon.tcpip-lab.edu/index.html. What actually happens in the network? 2 HTTP
More informationDomain Name Service. DNS Overview. October 2009 Computer Networking 1
Domain Name Service DNS Overview October 2009 Computer Networking 1 Why DNS? Addresses are used to locate objects (contain routing information) Names are easier to remember and use than numbers DNS provides
More informationIPng (IPv6) Motivation. Currently: mainly servers, workstations, SLIP/PPP Address space exhaustion + new uses:
1 IPng (IPv6) Motivation Currently: mainly servers, workstations, SLIP/PPP Address space exhaustion + new uses: permanently attached home computers (CATV) game consoles mobile terminals (PDAs) embedded
More informationApplication Layer Protocols
Application Layer Protocols Dr. Ihsan Ullah Department of Computer Science & IT University of Balochistan, Quetta Pakistan Email: ihsan.ullah.cs@gmail.com These slides are adapted from the slides accompanying
More informationCSEN 404 Introduction to Networks. Mervat AbuElkheir Mohamed Abdelrazik. ** Slides are attributed to J. F. Kurose
CSEN 404 Introduction to Networks Mervat AbuElkheir Mohamed Abdelrazik ** Slides are attributed to J. F. Kurose HTTP Method Types HTTP/1.0 GET POST HEAD asks server to leave requested object out of response
More informationLast time. Wireless link-layer. Introduction. Characteristics of wireless links wireless LANs networking. Cellular Internet access
Last time Wireless link-layer Introduction Wireless hosts, base stations, wireless links Characteristics of wireless links Signal strength, interference, multipath propagation Hidden terminal, signal fading
More informationOverview General network terminology. Chapter 9.1: DNS
Overview General network terminology Chapter 9.1: DNS Jan-29-04 4/598N: Computer Networks 1 Connection mechanisms Connectionless or packet switching Each packet carries with it the source and destination
More informationBSc Year 2 Data Communications Lab - Using Wireshark to View Network Traffic. Topology. Objectives. Background / Scenario
BSc Year 2 Data Communications Lab - Using Wireshark to View Network Traffic Topology Objectives Part 1: (Optional) Download and Install Wireshark Part 2: Capture and Analyze Local ICMP Data in Wireshark
More informationNetwork+ Guide to Networks, Seventh Edition Chapter 2, Solutions
Network+ Guide to Networks, Seventh Edition Chapter 2, Solutions [C HD] Applying Concepts: Configure Address Translation Using NAT At the end of this chapter, you ll create your own NAT translation table
More informationNetwork 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 informationCSCI 466 Midterm Networks Fall 2013
CSCI 466 Midterm Networks Fall 2013 Name: This exam consists of 6 problems on the following 7 pages. You may use your single-sided hand-written 8 ½ x 11 note sheet and a calculator during the exam. No
More informationLecture 8. Network Layer (cont d) Network Layer 1-1
Lecture 8 Network Layer (cont d) Network Layer 1-1 Agenda The Network Layer (cont d) What is inside a router Internet Protocol (IP) IPv4 fragmentation and addressing IP Address Classes and Subnets Network
More information0 0& Basic Background. Now let s get into how things really work!
+,&&-# Department of Electrical Engineering and Computer Sciences University of California Berkeley Basic Background General Overview of different kinds of networks General Design Principles Architecture
More informationTransport Layer (TCP/UDP)
Transport Layer (TCP/UDP) Where we are in the Course Moving on up to the Transport Layer! Application Transport Network Link Physical CSE 461 University of Washington 2 Recall Transport layer provides
More informationUDP and TCP. Introduction. So far we have studied some data link layer protocols such as PPP which are responsible for getting data
ELEX 4550 : Wide Area Networks 2015 Winter Session UDP and TCP is lecture describes the two most common transport-layer protocols used by IP networks: the User Datagram Protocol (UDP) and the Transmission
More informationCCNA 1 v3.11 Module 11 TCP/IP Transport and Application Layers
CCNA 1 v3.11 Module 11 TCP/IP Transport and Application Layers 2007, Jae-sul Lee. All rights reserved. 1 Agenda 11.1 TCP/IP Transport Layer 11.2 The Application Layer What does the TCP/IP transport layer
More informationIntroduction to Network. Topics
Introduction to Network Security Chapter 7 Transport Layer Protocols 1 TCP Layer Topics Responsible for reliable end-to-end transfer of application data. TCP vulnerabilities UDP UDP vulnerabilities DNS
More informationComputer Networking: A Top Down Approach Featuring the. Computer Networks with Internet Technology, William
Dr. John Keeney 3BA33 TCP/IP protocol architecture with IP OSI Model Layers TCP/IP Protocol Architecture Layers TCP/IP Protocol Suite Application Layer Application Layer Telnet FTP HTTP DNS RIPng SNMP
More informationData & Computer Communication
Basic Networking Concepts A network is a system of computers and other devices (such as printers and modems) that are connected in such a way that they can exchange data. A bridge is a device that connects
More information