Flexible · Affordable · Accessible
the people’s university
TEE 213/05
Telecommunication
Principles
Unit 5 COMPUTER COMMUNI...
the people’s university
Flexible · Affordable · Accessible
Switch / Hub Users
• A hub is slower than the switch. The switc...
the people’s university
Flexible · Affordable · Accessible
Example – Switch / Hub
• A 100Mb/s 8-port switch and a 100Mb/s ...
the people’s university
Flexible · Affordable · Accessible
Mesh Configuration
the people’s university
Flexible · Affordable · Accessible
• Example
• Calculate the number of links that will be needed t...
the people’s university
Flexible · Affordable · Accessible
Star Topology
• If the central computer (server) goes down, all...
the people’s university
Flexible · Affordable · Accessible
Ring Topology
the people’s university
Flexible · Affordable · Accessible
Ring Topology Description
• In a ring topology, the server or c...
the people’s university
Flexible · Affordable · Accessible
Bus Topology
In a Mesh topology, one node is connected to every...
the people’s university
Flexible · Affordable · Accessible
Advantages and disadvantages of each
topology
the people’s university
Flexible · Affordable · Accessible
Hierarchy of Networks
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Flexible · Affordable · Accessible
Relationship with different
types of networks
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Flexible · Affordable · Accessible
7-Layer OSI
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Flexible · Affordable · Accessible
OSI Analogy
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Flexible · Affordable · Accessible
The Packet Transmission
System
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Flexible · Affordable · Accessible
TCP/IP
OSI layers TCP/IP layers
7. Application Application
6. P...
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IPV4 Header
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IPV4 Address Classes
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Example
Given the company's network. Determine the Class of thi...
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Flexible · Affordable · Accessible
IPV4 addresses that cannot be
used
IP Address Reason why cannot...
the people’s university
Flexible · Affordable · Accessible
Example
• For a Class A network, calculate:
– The maximum numbe...
the people’s university
Flexible · Affordable · Accessible
Thank you
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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.
  20. 20. the people’s university Flexible · Affordable · Accessible IPV4 addresses that cannot be used IP Address Reason why cannot be used Default - Network 0.0.0.0 Refers to the default route. This route simplifies routing tables used by IP Loopback - Network 127.0.0.1 Reserved for loopback. The address 127.0.0.1 is often used to refer to the local host. Using this address, applications can address a local host as if it were a remote host. Network Address - IP address with all hosts bits set to 0 (for example, 192.0.0.0) Refers to the actual network itself. For example, network 202.178.0.0 can be used to identify network 202.178. This type of notation is often used within routing tables Subnet/network broadcast - IP address with all node bits set to 1 (for example 202.178.255.255) (255 represents 1) IP addresses with all node bits set to 1 are local network broadcast addresses and must not be used. Example: 125.255.255.255 (Class A) Network broadcast - IP address with all bits set to 1. Example: 255.255.255.255 The IP address with all bits set to 1 is a broadcast address and must not be used. These refer to all nodes in the network no matter what the IP address.
  21. 21. the people’s university Flexible · Affordable · Accessible Example • For a Class A network, calculate: – The maximum number of networks – The maximum number of valid hosts
  22. 22. the people’s university Flexible · Affordable · Accessible Thank you
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