The document provides information about computer networks and networking concepts. It defines a network as two or more computer systems linked together. The Internet is described as a global network connecting millions of computers. Network advantages include resource sharing, reliability with backup data storage, and fast communication like email. The key parts of a network are identified as workstations, nodes, servers, network interface cards, and connectivity. Network characteristics include topology, protocols, and architecture. Common network topologies like star, bus, ring, tree and mesh are defined along with their advantages and disadvantages.

1. Unit 1: Information
Communication Technology
Computer Networking
Mr.Johnny

2. Fill in the blanks
game

3. What is a network?
A network is a group of ____ or more
________ systems linked together

4. What is a network?
A network is a group of two or more
computer systems linked together

5. The Internet
The Internet is a global ______ connecting
millions of computers.

6. The Internet
The Internet is a global Network connecting
millions of computers.

7. 
________ sharing- allows users to share
programs and data to anyone connected
on the network.

Reliability- allows multiple copies of
important ____ at multiple locations. I.e
Banks, military operations.

Fast _____________- a cheap and easy
alternative, especially for a lot of
companies.I.e Email.
Advantages of a network

8. 
Resource sharing- allows users to share
programs and data to anyone connected
on the network.

Reliability- allows multiple copies of
important data at multiple locations. I.e
Banks, military operations.

Fast Communication- a cheap and easy
alternative, especially for a lot of
companies.I.e Email.
Advantages of a network

9. Parts of a Network

10. Parts of a Network
Workstation

11. Parts of a Network

12. Parts of a Network
Nodes

13. Parts of a Network

14. Parts of a Network
Server

15. Parts of a Network

16. Parts of a Network
Network
interface card

17. Parts of a Network

18. Parts of a Network
Network
Connectivity

19. Software for networking
• Network ________ System (NOS)-
Special operating system that helps
computers in a network.
• Specialised networking software-
Required to manage, direct and
control operations within a network.

20. Software for networking
• Network Operating System (NOS)-
Special operating system that helps
computers in a network.
• Specialised networking software-
Required to manage, direct and
control operations within a network.

21. What is a network characterized
by?
• Topology – The ______ of how computers
are connected together
• Protocol-Set of ____ that computers must
follow on the network to communicate with
each other.
• Architecture-This specifies the _______
components, their organization/configuration
and data formats used in processing.

22. What is a network characterized
by?
• Topology – The design of how computers are
connected together
• Protocol-Set of rules that computers must
follow on the network to communicate with
each other.
• Architecture-This specifies the physical
components, their organization/configuration
and data formats used in processing.

23. Network Topologies

24. Network Topology Activity
http://www.bbc.co.uk/schools/gcsebitesize/ict/datacomm/2networks_act.

25. Guess the Network Topology

26. Ring Network

27. Ring Network
Advantages
-Amount of cable needed is shorter
compared to other Topologies,
making it more reliable.
-Works very well with optical fibres.

28. Ring Network
Disadvantages
-If one Node fails to pass data, the
entire network fails.
-difficult to find problems in the
network
-Not possible to shut down a small
section of the ring without the entire
network not working.

29. Guess the Network Topology

30. Star Network

31. Star Network
Advantages
-easy to install and wire
-No interruption to the network if any nodes
fail
-easy to detect faults
-Protocols are simple as any given
connection only involves hub and
connecting node.

32. Star Network
Disadvantages
-Longer cables are needed, increasing cost.
-If central hub fails, entire network fails.
-One computer with a virus will affect all
computers.
-Number of nodes connecting is limited by
availability of connection points

33. Guess the Network Topology

34. Bus Network

35. Bus Network
Advantages
-wiring layout is simple, short cable is
sufficient to connect
-easy to extend, extra nodes can be
connected at any point.
-A signal Amplifier called a repeater can
be used to for extensive additions.

36. Bus Network
Disadvantages
-Entire Network is dependent on main/bus
cable.
-As control of the network is not
centralised,fault detection is not easy.
-Large number of computers can lead to a
performance problem.

37. Other Network Topologies
Tree Topology

38. Advantages
-easy to expand the network for new users
-supported by large number of hardware and
software vendors.
Disadvantages
-If “backbone” line breaks, the network will go
down
-difficult to configure/wire than other
topologies

39. Mesh Topology

40. Mesh Topology
Advantages
-multiple links, if one route is blocked,
other routes can be used for
communication
-Easy to find problems
-Performance is not affected with heavy
load of data transmission

41. Mesh Topology
Disadvantages
-can be expensive
-Difficult to install