Computer Networks Part 2 Topology Network Topology Network

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Computer Networks Part 2 Topology

Computer Networks Part 2 Topology

Network Topology

Network Topology

Network Topology Ø Topology means “arrangement” or “layout” Ø Network Topology: • How the

Network Topology Ø Topology means “arrangement” or “layout” Ø Network Topology: • How the different parts of a network are arranged and connected together. Ø Network Topologies: v. Bus v. Ring v. Star v. Mesh v. Hybrid

Criteria for Topology Selection Ø Cost Ø Ease of maintenance Ø Ease of installation

Criteria for Topology Selection Ø Cost Ø Ease of maintenance Ø Ease of installation Ø Cable fault tolerance

Bus Topology One single network cable is used from one end of the network

Bus Topology One single network cable is used from one end of the network to the other end.

Bus Topology Ø Advantages v. Simple to install v. Cheap to install v. Less

Bus Topology Ø Advantages v. Simple to install v. Cheap to install v. Less cable is used compare to any other topologies Ø Disadvantages v. If main cable is damaged, the whole network will fail. v. As more workstations are connected to the network, the network performance will become slower. v. Every workstation can access all the data on the network (Security Issues)

Ring Topology Ø If we connect the two ends of bus topology cable, we

Ring Topology Ø If we connect the two ends of bus topology cable, we have a ring topology Ø Each computer is connected to two other computers to form a ring

Ring Topology Ø Data travels one way on the ring. Ø Each computer receives

Ring Topology Ø Data travels one way on the ring. Ø Each computer receives data in turn till it reaches the destination

Ring Topology Ø Advantages v. Simple to design v. Transfer data quickly (one way

Ring Topology Ø Advantages v. Simple to design v. Transfer data quickly (one way traffic) Ø Disadvantages The whole network fails if: vthe main cable fails vor if any device on the network fails

Star Topology Ø A central point called hub hosts a set of workstations Ø

Star Topology Ø A central point called hub hosts a set of workstations Ø Each device on the network has its own cable connecting to a central hub or switch.

Star Topology Ø Advantages v. Can add nodes easily v. Single failure cannot bring

Star Topology Ø Advantages v. Can add nodes easily v. Single failure cannot bring down the network v. Easy to troubleshoot Ø Disadvantages v. Uses more cables which make it expensive v. If hub fails, the entire system will fail

Mesh Topology Ø All nodes are connected to each other Ø More popular in

Mesh Topology Ø All nodes are connected to each other Ø More popular in WAN than in LAN

Mesh Topology Ø Advantages v. The most reliable network topology Ø Disadvantages v. Expensive

Mesh Topology Ø Advantages v. The most reliable network topology Ø Disadvantages v. Expensive as cable cost is high

Hybrid Topology • a network topology that combines two or more of the previous

Hybrid Topology • a network topology that combines two or more of the previous topologies. • E. g. combines several star networks

Activity • http: //www. bbc. co. uk/schools/gcsebitesize/ict/ datacomm/2 networks_act. shtml

Activity • http: //www. bbc. co. uk/schools/gcsebitesize/ict/ datacomm/2 networks_act. shtml

Test • http: //www. bbc. co. uk/apps/ifl/schools/gcsebite size/ict/quizengine? quiz=networks; template. Sty le=ict

Test • http: //www. bbc. co. uk/apps/ifl/schools/gcsebite size/ict/quizengine? quiz=networks; template. Sty le=ict

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