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Digital Communication I
Lecturer: Dr A.W. Moore
No. of lectures: 16
This course is a prerequisite for the Part II courses Digital Communication II, Distributed Systems and Security.
Aims
The aim of this course is to introduce key concepts and principles of computer networks. The course will use a top-down approach to study of the Internet and its protocol stack. Instances of architecture, protocol, application-examples will include email, web and media-streaming. We will cover communications services (e.g., TCP/IP) required to support such network applications. The implementation and deployment of communications services in practical networks: including wired and wireless LAN environments, will be followed by a discussion of issues of network-security and network-management, Throughout the course, the Internet's architecture and protocols will be used as the primary examples to illustrate the fundamental principles of computer networking.
Lectures
- Introduction.
Overview of networking using the Internet as an example. LANs and
WANs. OSI reference model, Internet TCP/IP Protocol Stack. Client/server
paradigm, circuit-switching, packet-switching, Internet structure,
networking delays and packet loss. [2 lectures]
- Application layer.
Service requirements, WWW, HTTP, electronic mail, Domain Name System,
P2P, socket programming API. [2 lectures]
- Transport layer.
Service models, multiplexing/demultiplexing, connection-less transport
(UDP), principles of reliable data transfer, connection-oriented
transport (TCP), TCP congestion control, TCP variants. [2 lectures]
- Network layer addressing.
Network layer services, IP, IP addressing, IPv4, DHCP, NAT, ICMP, IPv6.
[2 lectures]
- Network layer routing.
Routing and forwarding, routing algorithms, routing in the Internet,
RIP, OSPF, BGP, multicast. [2 lectures]
- Link layer and local area networks.
Link layer services, error detection and correction, Multiple Access
Protocols, link layer addressing, Ethernet, hubs and switches,
Point-to-Point Protocol. [2 lectures]
- Wireless and mobile networks.
Wireless links and network characteristics, Wi-Fi: IEEE 802.11 wireless
LANs, mobility management and mobile IP.
- Multimedia networking.
Networked multimedia applications, best-effort service and multimedia
delivery requirements, multimedia protocols (RTSP, RTP, RTCP, SIP),
content distribution networks. [2 lectures]
- Network security and network management.
Cryptography, integrity, securing email, securing TCP (SSL), firewalls
and IDS, network management components, Internet management framework,
presentation services.
Objectives
At the end of the course students should
- be able to analyse a communication system by separating out the
different functions provided by the network;
- understand that there are fundamental limits to any communications
system;
- understand the general principles behind multiplexing, addressing,
routing, reliable transmission and other stateful protocols as well as
specific examples of each;
- understand what FEC is and how CRCs work;
- be able to compare communications systems in how they solve
similar problems;
- have an informed view of both the internal workings of the
Internet and of a number of common Internet applications and
protocols.
Recommended reading
* Kurose, J.F. & Ross, K.W. (2009). Computer networking: a top-down approach. Addison-Wesley (5th ed.).
Peterson, L.L. & Davie, B.S. (2007). Computer networks: a systems approach. Morgan Kaufmann (4th ed.).
Comer, D. & Stevens, D. (2005). Internetworking with TCP-IP, vol. 1 and 2. Prentice Hall (5th ed.).
Stevens, W.R., Fenner, B. & Rudoff, A.M. (2003). UNIX network programming, Vol.I: The sockets networking API. Prentice Hall (3rd ed.).




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