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G52CCN Computer Communications and Networks

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Title: G52CCN Computer Communications and Networks

1
G52CCNComputer Communications and Networks

Milena Radenkovic
Room B47
Email mvr_at_cs.nott.ac.uk

2
Introduction

Practical matters
Module goals, structure and contents
Initial introduction to some key ideas and issues

3
Lectures

Thursday 1500 1600
Jubilee Campus, Exchange Building, LT2
Friday 0900 1000
Jubilee Campus, Exchange Building, LT2

4
Related modules

G53ACC - Advanced Computer Communications
G5BIAW - The Internet and the World Wide Web

5
Objectives

To understand the basic principles of data
communications and computer networks.
To appreciate the complex trade-offs that are
inherent in the design of networks.
To provide a guided tour of network technologies
from the lowest levels of data transmission up to
network applications.
To learn about current networking technologies,
especially Internet protocols.

6
Assessment

Two hour written examination
The style of question will be based upon those
from previous years. Their content will of course
be different.
Last years exam paper is on sale in the bookshop
and previous papers are in the library.
No coursework

7
Text books and notes

My notes are available at
http//www.cs.nott.ac.uk/mvr/ccn
The core recommended course text is
Computer Networks and Internets, Douglas E.
Comer, Prentice Hall
Supplementary texts are
Tannenbaum, Computer Networks, Prentice Hall
Halsall, Data and Computer Communications,
Macmillan

8
What is a computer network?

An interconnection of autonomous computers (as
opposed to communication between separate but
interdependent parts of a single computer)

9
Some goals of computer networks

Access to remote resources
Human communication
Mobile computing
Computing power through parallelism
Optimising resources - load balancing
Incremental growth of computer systems (reduced
cost and risk)
Increased robustness through graceful degradation

10
Uses of computer networks

Email, World Wide Web, Video Conferencing, File
Transfer, Collaborative Virtual Environments,
Remote control of robots and machines, Dial up
databases, Webcasting, Distributed Programs,
Hacking, Banking, Internet telephone

11
Classifying networks

By size
Local area networks (LANs) versus Wide area
networks (WANs)
By connectivity
Point to point versus broadcast networks
By communication medium
By mobility
Fixed versus mobile

12
Size - differences between local and wide area
networks

Speed - bandwidth and latency
Management
Security
Reliability
Billing
Heterogeneity (and standards)

13
Connectivity - point to point networks
tree
star
irregular
mesh
14
Connectivity - broadcast networks
wire
satellite/radio
15
Medium - differences between communication media

Speed - bandwidth and latency
Range
Sharing
Topology
Installation and maintenance costs
Reliability

16
Mobility - issues arising in mobile networks

Mobile networking has emerged in the last decade.
Introduces new issues of
energy efficiency
location and tracking
semi-persistent connections
complex administration and billing as devices and
users move around the network

17
Common issues in networking

Addressing
Routing
Framing and encoding
Error detection and correction
Flow and congestion

18
Module contents and structure
Part 4 applications
Part 3 internetworking
Part 2 packet transmission
Part 1 data transmission
19
Part 1 data transmission