Course Outline (1) Fundamentals of Computer Networks ECE 478/578. Introduc)on. Fundamentals of Computer Networks (ECE 478/578)
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1 Fundamentals of Computer Networks ECE 478/578 Spring 2013 Introduc)on Course Outline (1) Fundamentals of Computer Networks (ECE 478/578) Course Schedule: Tuesday & Thursday, 8:00am 9:15am 1
2 Course Outline (2) Website: acl.ece.arizona.edu/classes/ece478 Instructor Youssif Alnashif, Ph.D. Office: 356 P/N ECE Building Instructor Office Hours: Tuesdays 9:15am 10.15am Thursdays 2:30pm 3:30pm Course Outline (3) Course DescripXon: IntroducXon to computer networks and protocols. Study of the ISO open systems interconnecxon model, with emphasis on the physical, data link, network, and transport layers. Discussion of IEEE 802, OSI, and Internet protocols. 2
3 Course Outline (4) Prerequisites: ECE 175, SIE 305, All students must have access to and the capability to access the class website. Text Book: Computer Networks, Larry L. Peterson and Bruce S. Davie, Morgan Kaufmann, EdiXon 5, Course Outline (5) Grading Policy: ECE 478 Grading: Homework 15% Lab 10% Midterm 25% Project 20% Final 25% Class ParXcipaXon 5% ECE 578 Grading: Homework 10% Lab 10% Midterm 20% Project 20% Semester Paper 15% Final Exam 20% Class ParXcipaXon 5% 3
4 Course Outline (6) Topics: IntroducXon and Overview Data CommunicaXons Signal Encoding Techniques Data Link Control Protocols Local Area Network Overview Ethernet and MulXple Access Networks (802.3) Wireless Networks Switching and Bridging Basic Internetworking (IP) Queuing Theory RouXng Protocols MulXcast RouXng among mobile devices TCP, UDP and RPC Protocols CongesXon Control and Resource AllocaXon Network Security ApplicaXon Protocols Course Outline (7) Important Deadlines: Midterm: Thursday Feb 28 th Project: Abstract: February 19 th Outline: March 7 th Full Project Report: April 30 th For ECE578 Paper: Abstract: February 19 th Outline: March 7 th Full Paper: April 30 th 4
5 What is a computer(data) network? A Computer network, or simply a network, is a collecxon of computers and other hardware interconnected by communicaxon channels that allow sharing of resources and informaxon. Wikipedia What we will learn in this course? Network concepts: OSI and TCP/IP models and layers Protocols Resources naming and allocaxon Overcome some of the network issues Network Programming Socket programming Designing and ImplemenXng protocols 5
6 What is needed in order for two enxxes to communicate? IdenXficaXon RepresentaXon Protocol Medium 6
7 What disxnguishes computer networks from other types of network? Generality, i.e., carrying many different types of data and supporxng many applicaxons 7
8 ApplicaXon HTTP Example: Request: URL: hkp:// Message: GET / HTTP/1.1 Response Message: HTTP/ OK Date: Thu, 10 Jan :57:12 GMT Expires: - 1 Cache- Control: private, max- age=0 Content- Type: text/html; charset=iso Set- Cookie: PREF=ID= b740bdae0:FF=0:TM= :LM= :S=3lX5Dygwj7TUEJNG; expires=sat, 10- Jan :57:12 GMT; path=/; domain=.google.com, NID=67=gcb50ZfG7QxkGuenxYWASedkuFHG3nWV1Nn7- XyEj- oxdvxtqkgisxupktpqyjx4nt12dny- BWSTd2solDDhJD- vxqhcwcy6zprkg5z6kzjll7rzmphtf- VCKN92VaE; expires=fri, 12- Jul :57:12 GMT; path=/; domain=.google.com; HkpOnly P3P: CP="This is not a P3P policy! See hkp:// support/accounts/bin/answer.py?hl=en&answer= for more info. Server: gws X- XSS- ProtecXon: 1; mode=block X- Frame- OpXons: SAMEORIGIN ConnecXon: close HTML Document Requirements Application Programmer List the services that his application needs: delay bounded delivery of data Network Designer Design a cost-effective network with sharable resources Network Provider List the characteristics of a system that is easy to manage 8
9 Connectivity (a) (b) Point-to-point Multiple access Need to understand the following terminologies Scale Link Nodes Point-to-point Multiple access Switched Network Circuit Switched Packet Switched Packet, message Store-and-forward Connectivity (a) (b) Terminologies (contd.) Cloud Hosts Switches internetwork Router/gateway Host-to-host connectivity Address Routing Unicast/broadcast/ multicast (a) (b) A switched network Interconnection of networks 9
10 Cost-Effective Resource Sharing MulXplexing mulxple logical flows over a single physical link Resource: links and nodes How to share a link? Multiplexing De-multiplexing Synchronous Time-division Multiplexing Time slots/data transmitted in predetermined slots Cost-Effective Resource Sharing A switch mulxplexing packets from mulxple sources onto one shared link FDM: Frequency Division Multiplexing Statistical Multiplexing Data is transmitted based on demand of each flow. What is a flow? Packets vs. Messages FIFO, Round-Robin, Priorities (Quality-of- Service (QoS)) Congested? LAN, MAN, WAN SAN (System Area Networks 10
11 Support for Common Services Logical Channels Application-to-Application communication path or a pipe Process communicaxng over an abstract channel Common Communication Patterns Client/Server Two types of communication channel Request/Reply Channels Message Stream Channels 11
12 Reliability Network should hide the errors Bits are lost Bit errors (1 to a 0, and vice versa) Burst errors several consecutive errors Packets are lost (Congestion) Links and Node failures Messages are delayed Messages are delivered out-of-order Third parties eavesdrop Network Architecture Example of a layered network system 12
13 Network Architecture Layered system with alternaxve abstracxons available at a given layer 13
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