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NETWORKINGBSIT 4 / CHS TTH 12:30 2 / 202NETWORKING DEVICESPART 1#FUNCTIONSConnecting or expanding a network

Separate networksExample:HubBridges

RoutersSwitches

#2EXPANDING NETWORKSTedious process

Less efficient

Create smaller networks from bigger ones

Requires various devices#3EXPANSION DEVICESRegenerates signals for resending

Multiport used to broadcast signals simultaneously1. Repeaters and Hubs#4EXPANSION DEVICESCan support different types of mediaMost Economic way of expanding a networkFeaturesCannot link unlike segmentsCannot join segments with different access methods (e.g. CSMA/CD and token passing)Do not isolate and filter packetsLimitations#5EXPANSION DEVICESRepeaters and Hubs

#6EXPANSION DEVICESUse to connect two segments or two networks2. Bridges

#7EXPANSION DEVICESHas one input and one output

Used to isolate network traffic and computers

Has the intelligent to examine incoming packet source and destination addresses

Features#8EXPANSION DEVICESCannot interpret higher-level information

Cfilter packet according to its protocol

Limitations#9EXPANSION DEVICESHow Bridges WorksUses Transmit and Stop method

Uses Routing table#10EXPANSION DEVICESHow Bridges Works

#11EXPANSION DEVICES

Add01Add03Add02S 01 D 02Switching TableSeg 1 Seg 20102StopS 02 D 01#12EXPANSION DEVICESBridge

#13EXPANSION DEVICESWorks as a hub but more intelligent

Divides a network into several isolated channels3. SWITCHES#14EXPANSION DEVICESBetter use of limited bandwidth

More cost-effective than bridge

Can be considered as multiport bridges

Can interpret address information

Features#15EXPANSION DEVICESReduce the possibility of collision

Each channel has its own network capacity

Since isolated, hence secure

Advantages#16EXPANSION DEVICESCan be overwhelmed by traffic

Cannot detect collision if buffer is fullLimitations#17EXPANSION DEVICES10MbpsSwitchHub

10Mbps3Mbps#18EXPANSION DEVICESSwitch Application - VLAN

HubHubHubSW1SW2SW3VLAN1VLAN2#19EXPANSION DEVICESSwitch

#20EXPANSION DEVICESUsed to route packets to their correct destination

Identify the best path to take for packet transmission

Make transmission faster and efficient4. Router#21EXPANSION DEVICESEnables a router to route a packet from a TCP/IP Ethernet network to a TCP/IP token ring network

Only packets with known network addresses will be passed - hence reduce traffic

Routers can listen to a network and identify its busiest part

How a Router works#22EXPANSION DEVICESNot suitable for large network

Filter packet according to its protocol

Limitations#23EXPANSION DEVICESRouter Wireless Capable

#24EXPANSION DEVICESCISCO Router

#25EXPANSION DEVICESCISCO Router

#26EXPANSION DEVICESCISCO Router

#27EXPANSION DEVICES

#28Any questions?End of Lecture.#