networking

network security

1. Computer Networks and Data
Communications
Course Code: 3114
Instructor: Atuheire Izaara Ambrose
Credit:4.0
When: Thursday11:00 –12:30 pm
Venue:Post Graduate Room1

2. •EXPECTATIONS?

3. My Expectations
•Attend all lectures
•Implement assigned projects
•Do coursework and be involved in class
discussions
•Implement one final project

4. Prerequisites
•ComputerSkills/knowledgeonInternet
•Coursesite:https://lms.must.ac.ug/
•YouwillbeabletoaccessalltheLecture
presentationsandelectronictextbooksthroughthe
LMS.
•Enrolmentkeyis
3114

5. Software's to use
•Packet Tracer 6 or 7.2

6. EVALUATION SYSTEM
INCLASS: In class assignments 30%
All computed
out of 40%
MID-TERM TEST: 50%
FINAL PROJECTS: GROUPPROJECTS 20%
ATTENDANCE CRUCIALTO ENHANCE PASSING!!!!
FINALEXAM 100
%
Computed out
of 60%

7. SEMESTER PROJECT
•…….Suggestions??
•Youwillberequiredtousetheknowledgeyou
acquireinthisclasstodesignastructureofa
campusnetworkusingpackettracer.
•PresentationswillbeinNovember.

8. Tentative Course Content
Lecture 1: Overview of the Course and Network
Fundamentals: 2 Hour
Lecture 2: OSI Model& TCP/IP Model : 2 Hour
Lecture 3: Physical Media (Copper, Fiber Optic and Wireless)
: 2 Hour
Lab 1: Intro to Packet Tracer
Lecture 4: UTP & Fiber Cabling: 2 Hour
Lecture 5: LAN Technologies (Ethernet, Fast Ethernet,
Gigabit Ethernet, Wireless LAN) : 2 Hour
Lab 2: Demo and Practice of UTP Cabling: 2 Hour
Lecture 6: LAN Technologies (contd.) : 2 Hour
Course Content

9. Course Content
Lecture 7: WAN Technologies (Dialup, Leased Line, ISDN,
ADSL, Cable Modem, VSAT) : 2 Hour
Lab 3: Demo and Practice of Ethernet & Wireless LAN Setup :
2 Hour
Lecture 8: WAN Technologies (contd.) : 2 Hour
Lecture 9: Internet Protocol (IP) and IP Addressing: 2 Hour
Lab 4: Demo and Practice of Setting up Subnets and IP
Address Assignment : 2 Hour
Lecture 10: Routing, VLAN, TCP and UDP: 2 Hour
Lecture 11: SNMP, Natting, Firewall and VPN: 2 Hour
Lecture 12: Internet and Internet Applications (DNS, Email,
Web..): 2 Hour
Course Content

10. Tentative Course Content
Lecture 13: Cisco Switch and Router Configuration : 2 Hour
Lecture 14: Enterprise Networks and summative class: 2 Hour
Course Content

11. Tentative Course Content
Lecture 17: Mail Server, Proxy Server & Firewall Setup on
Linux : 2 Hour
Lab 8: Demo and Practice of Mail Server , Proxy Server and
Firewall Setup : 2 Hour
Course Content

12. References / Books
AndrewS.Tanenbaum,ComputerNetwork,Prentice-Hall
DoughlasE.Comer,ComputerNetworksandInternet
http://www.cisco.com/public/support/tac/documentation.
html
Books

13. INTRODUCTION TO COMPUTER
NETWORKS
Introduction to Computer Networks

14. Computer Networks
Computernetworkconnects
twoormoreautonomous
computers.
Thecomputerscanbe
geographicallylocated
anywhere.
Introduction to Computer Networks

15. LAN, MAN & WAN
NetworkinsmallgeographicalArea(Room,Buildingora
Campus)iscalledLAN(LocalAreaNetwork)
NetworkinaCityiscallMAN(MetropolitanAreaNetwork)
Networkspreadgeographically(CountryoracrossGlobe)is
calledWAN(WideAreaNetwork)
Introduction to Computer Networks

16. Applications of Networks
Resource Sharing
Hardware (computing resources, disks, printers)
Software (application software)
Information Sharing
Easy accessibility from anywhere (files, databases)
Search Capability (WWW)
Communication
Email
Message broadcast
Remote computing
Distributed processing (GRID Computing)
Introduction to Computer Networks

17. 1.17
Network Criteria
•Performance
•Depends on Network Elements
•Measured in terms of Delay and Throughput
•Reliability
•Failure rate of network components
•Measured in terms of availability/robustness
•Security
•Data protection against corruption/loss of data due
to:
•Errors
•Malicious users

18. 1.18
Physical Structures
•Type of Connection
•Point to Point -single transmitter and
receiver
•Multipoint -multiple recipients of
single transmission
•Physical Topology
•Connection of devices
•Type of transmission -unicast,
mulitcast, broadcast

19. 1.19
Figure 1.3 Types of connections: point-to-point and multipoint

20. Network Topology
Thenetworktopology
definesthewayinwhich
computers,printers,and
other devicesare
connected.Anetwork
topologydescribesthe
layoutofthewireand
devicesaswellasthe
pathsusedbydata
transmissions.
Introduction to Computer Networks

21. Bus Topology
Commonlyreferredtoasa
linearbus,allthedevices
onabustopologyare
connectedbyonesingle
cable.
Introduction to Computer Networks

22. Star & Tree Topology
The star topology is the most
commonly used architecture in
Ethernet LANs.
Wheninstalled,thestartopology
resemblesspokesinabicycle
wheel.
Largernetworksusetheextended
startopologyalsocalledtree
topology.Whenusedwithnetwork
devicesthatfilterframesorpackets,
likebridges,switches,androuters,
thistopologysignificantlyreduces
thetrafficonthewiresbysending
packetsonlytothewiresofthe
destinationhost.
Introduction to Computer Networks

23. Ring Topology
Aframetravelsaroundthering,
stoppingateachnode.Ifanodewants
totransmitdata,itaddsthedataas
wellasthedestinationaddresstothe
frame.
Theframethencontinuesaroundthe
ringuntilitfindsthedestinationnode,
whichtakesthedataoutoftheframe.
Singlering–Allthedevicesonthe
networkshareasinglecable
Dualring–Thedualringtopology
allowsdatatobesentinboth
directions.
Introduction to Computer Networks

24. Mesh Topology
Themesh topology
connectsalldevices
(nodes)toeachotherfor
redundancyandfault
tolerance.
ItisusedinWANsto
interconnectLANsandfor
missioncriticalnetworks
likethoseusedbybanks
andfinancialinstitutions.
Implementingthemesh
topologyisexpensiveand
difficult.
Introduction to Computer Networks

25. Network Components
Physical Media
Interconnecting Devices
Computers
Networking Software
Applications
Introduction to Computer Networks

26. Networking Media
Networkingmediacanbe
definedsimplyasthe
meansbywhichsignals
(data)aresentfromone
computertoanother
(eitherbycableorwireless
means).
Introduction to Computer Networks

27. Networking Devices
HUB,Switches,Routers,
WirelessAccessPoints,
Modemsetc.
Introduction to Computer Networks

28. Computers: Clients and Servers
Inaclient/servernetwork
arrangement,network
servicesarelocatedina
dedicatedcomputerwhose
onlyfunctionistorespond
totherequestsofclients.
Theservercontainsthe
file,print,application,
security,andotherservices
inacentralcomputerthat
iscontinuouslyavailableto
respondtoclientrequests.
Introduction to Computer Networks

29. Networking Protocol: TCP/IP
Introduction to Computer Networks

30. Applications
E-mail
Searchable Data (Web Sites)
E-Commerce
News Groups
Internet Telephony (VoIP)
Video Conferencing
Chat Groups
Instant Messengers
Internet Radio
Introduction to Computer Networks

31. Assignment to be done Next week
•Study the OSI and TCP models and their relevance in
the Networking process. Make hand written
summative notes on your findings.
•To be handed in ….