EE450-U8-ConnectingDevices-Nazarian-Summer11

EE450-U8-ConnectingDevices-Nazarian-Summer11 - University...

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University of Southern California Viterbi School of Engineering EE450 omputer Networks Computer Networks onnecting Devices Connecting Devices Shahin Nazarian Summer 2011
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! I wonder where Alice moved to? Shahin Nazarian/EE450/Summer 2011
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Connecting Devices Connecting devices are layer1 devices such as ____, layer2 devices such as _______, layer 3 devices such as _____ nd inally 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/Summer 2011 3
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Connecting Devices (Cont.) Hubs Hubs or repeaters repeaters are layer 1 devices and do not recognize ____ address Bridges Bridges or L2 switches L2 switches (layer 2 switches) are MAC layer devices (consist of two layers) and they can recognize ______ addresses, however they cannot recognize ____ addresses outers an recognize addresses Routers Routers can recognize ____________ addresses _________ _________ are more sophisticated and can recognize even different applications Shahin Nazarian/EE450/Summer 2011 4
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________ Hubs A _________ hub is just a connector. It connects the wires coming from different branches. In a tar pology Ethernet LAN a passive hub is just a star-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/Summer 2011 5
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Hub or Repeater The functionality of a repeater is to ___________ the signal t is basically to extend the network coverage It is basically to extend the network coverage A repeater looks at the signal as a group of 0s and 1s n active hub is usually a multiport peater An active hub is usually a multiport repeater Shahin Nazarian/EE450/Summer 2011 6
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Collision Domain and Broadcast Domain ________ domain is defined as a set of nodes that compete to access the channel domain defined as the set of nodes that ________ domain is defined as the set of nodes that receive a broadcast transmission A repeater or hub can isolate broadcast p ______ ____ collision domains Shahin Nazarian/EE450/Summer 2011 7
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Collision and Broadcast Domains (Cont.) Networks are distinguished by the network address Removing the repeater, there is ____ network, ____ ollision omain nd broadcast omain collision domain and _____ broadcast domain However with the repeater, there is ____ network, ___ collision domain and ___ 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/Summer 2011 8 B
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Hub or Repeater (Cont.) Repeater is a regenerator; it is a _____ way device . It is not an amplifier (amplifier is a _____ way device) When signal travels through the medium it gets
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EE450-U8-ConnectingDevices-Nazarian-Summer11 - University...

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