EE450-U8-ConnectingDevices-Nazarian-Spring10

EE450-U8-ConnectingDevices-Nazarian-Spring10 - University...

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University of Southern California Viterbi School of Engineering EE450 omputer Networks Computer Networks onnecting Devices Connecting Devices Shahin Nazarian Spring 2010
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! I wonder where Alice moved to? Shahin Nazarian/EE450/Spring 2010
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Connecting Devices Connecting devices are layer1 devices such as hubs, layer2 devices such as bridges, layer 3 devices such as routers nd finally gateways with all 5 yers and are sed to and finally gateways with all 5 layers and are used to interconnect two or more networks together Connecting devices are classified based on their unctionality in the TCP/IP model User also decides which functionality in the TCP/IP model. User also decides which one to use based on their functionality Shahin Nazarian/EE450/Spring 2010 3
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Connecting Devices (Cont.) Hubs Hubs or repeaters repeaters are layer 1 devices and do not recognize any address Bridges Bridges or L2 switches L2 switches (layer 2 switches) are MAC layer devices (consist of two layers) and they can recognize MAC addresses, however they cannot recognize IP addresses outers an recognize both MAC and IP ddresses Routers Routers can recognize both MAC and IP addresses Gateways Gateways are more sophisticated and can recognize even different applications Shahin Nazarian/EE450/Spring 2010 4
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(Optional) Passive Hubs A passive hub is just a connector. It connects the wires coming from different branches. In a star- opology Ethernet LAN a passive hub is just a point topology Ethernet LAN, a passive hub is just a point where the signals coming from different stations collide. This type of the hub is part of the media. Its location in the Internet model is below physical layer Shahin Nazarian/EE450/Spring 2010 5
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Hub or Repeater The functionality of a repeater is to regenerate the signal It is basically to extend the network coverage A repeater looks at the signal as a group of 0s and 1s An active hub is usually a multiport repeater Collision domain is defined as a set of nodes that compete to access the channel Broadcast domain is defined as the set of nodes that receive a broadcast transmission A repeater or hub can isolate neither broadcast nor collision domain Shahin Nazarian/EE450/Spring 2010 6
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Hub or Repeater (Cont.) Networks are distinguished by the network address Removing the repeater, there are two networks, two ollision domains and two broadcast domains collision domains and two broadcast domains However with the repeater, there is one network, one collision domain and one broadcast domain This is not desirable Let’s assume networks are both Ethernet: A is sending a rame to B The repeater and all the nodes connected to frame to B. The repeater and all the nodes connected to the network will receive the frame A Shahin Nazarian/EE450/Spring 2010 7 B
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Hub or Repeater (Cont.) Repeater is a regenerator; it is a two way device . It is not an amplifier (amplifier is a one way device) When signal travels through the medium it gets
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This note was uploaded on 09/04/2010 for the course EE 450 at USC.

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EE450-U8-ConnectingDevices-Nazarian-Spring10 - University...

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