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# COMPUTER COMMUNICATION NETWORKS AND INTERNET

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### COMPUTER COMMUNICATION NETWORKS AND INTERNET

1. 1. Flexible · Affordable · Accessible the people’s university TEE 213/05 Telecommunication Principles Unit 5 COMPUTER COMMUNICATION NETWORKS AND INTERNET Semester January 2012
2. 2. the people’s university Flexible · Affordable · Accessible Switch / Hub Users • A hub is slower than the switch. The switch can support up to 2N users without dividing the speed by the number of users. • The switch achieves this by quickly switching between many users at the same time. This is due to the assumption that not all computers will be requesting for information at the same time.
3. 3. the people’s university Flexible · Affordable · Accessible Example – Switch / Hub • A 100Mb/s 8-port switch and a 100Mb/s 8-port hub are tested for 8 users. Calculate the speed that will be experienced by each user when the: – Switch is used – Hub is used • • Switch = No degradation of speed will be experienced and each user will experience 100Mb/s. • Hub = Each user will experience a maximum surfing speed of 100Mb/s / 8 = 12.5Mb/s
4. 4. the people’s university Flexible · Affordable · Accessible Mesh Configuration
5. 5. the people’s university Flexible · Affordable · Accessible • Example • Calculate the number of links that will be needed to link up 10 computers.
6. 6. the people’s university Flexible · Affordable · Accessible Star Topology • If the central computer (server) goes down, all communication between computers ceases. • This configuration is also speed-limited as all communications need to pass through a single node (the server computer).
7. 7. the people’s university Flexible · Affordable · Accessible Ring Topology
8. 8. the people’s university Flexible · Affordable · Accessible Ring Topology Description • In a ring topology, the server or control computer and all computers are linked in a single close-loop. • Usually data is transferred around the ring in only 1 direction, passing through each node. • Therefore, there is some amplification and regeneration of data at each node, permitting long distance transmission distances between nodes. • The ring topology can also be implemented at a low cost. Expansion is also simple, as a new node can be easily inserted into the ring network at any point.
9. 9. the people’s university Flexible · Affordable · Accessible Bus Topology In a Mesh topology, one node is connected to every other node. Every node can talk directly to all other nodes. This arrangement is very expensive and will cost more with the increase of computers in the system, especially with wired connections.
10. 10. the people’s university Flexible · Affordable · Accessible Advantages and disadvantages of each topology
11. 11. the people’s university Flexible · Affordable · Accessible Hierarchy of Networks
12. 12. the people’s university Flexible · Affordable · Accessible Relationship with different types of networks
13. 13. the people’s university Flexible · Affordable · Accessible 7-Layer OSI
14. 14. the people’s university Flexible · Affordable · Accessible OSI Analogy
15. 15. the people’s university Flexible · Affordable · Accessible The Packet Transmission System
16. 16. the people’s university Flexible · Affordable · Accessible TCP/IP OSI layers TCP/IP layers 7. Application Application 6. Presentation 5. Session 4. Transport Host-to-Host (TCP) 3. Network IP 2. Data link Network access 1. Physical
17. 17. the people’s university Flexible · Affordable · Accessible IPV4 Header
18. 18. the people’s university Flexible · Affordable · Accessible IPV4 Address Classes
19. 19. the people’s university Flexible · Affordable · Accessible Example Given the company's network. Determine the Class of this network From Figure, the router has address 202.178.0.1. Matching the net ID with Table, this is a class C network.