DCN_rpj8 - NT503 Data Communication Networking Switching...

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1 NT503: Data Communication & Networking Switching and routing concepts
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2 Networking devices ¾ Various networking and internetworking devices are, Repeaters Hubs Bridges Switches Routers Gateways ¾ Each of these devices interact with protocols at different layers of the OSI or TCP/IP model
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3 OSI model & Networking devices Application Presentation Session Network Transport Data Link Physical Application Presentation Session Network Transport Data Link Physical Repeater Bridge Router Gateway
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4 Repeaters ¾ It is a Layer-1 device (operates at the physical layer of the OSI model) ¾ Regenerates the digital signals (before they become too weak) into the original bit pattern and put them back onto the link. ¾ For analog signals, they are amplified and put back onto the link ¾ The physical distance of transmission is extended by the use of repeaters ¾ Protocols: X.21, RS232C, RS485, ….
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5 Repeaters ¾ They are not intelligent devices, which means each network segment being connected must use the same protocol and media access scheme (i.e. repeater can not connect Ethernet LAN segment to a token ring LAN segment)
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6 Bridges It is a layer-2 device and can operate in both the physical
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