EE450-U8-ConnectingDevices_Lecture-Nazarian-Summer10

EE450-U8-ConnectingDevices_Lecture-Nazarian-Summer10 -...

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EE450 Computer Networks Connecting Devices Shahin Nazarian Summer 2010
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Shahin Nazarian/EE450/Summer 2010 ! I wonder where Alice moved to?
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Shahin Nazarian/EE450/Summer 2010 Connecting Devices 3
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Shahin Nazarian/EE450/Summer 2010 Connecting Devices (Cont.) 4
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Shahin Nazarian/EE450/Summer 2010 (Optional) Passive Hubs 5
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Shahin Nazarian/EE450/Summer 2010 Hub or Repeater 6
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Shahin Nazarian/EE450/Summer 2010 Hub or Repeater (Cont.) Networks are distinguished by the network address Removing the repeater, there are ____ networks, ____ collision domains and _____ broadcast domains 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 frame to B. The repeater and all the nodes connected to the network will receive the frame 7 A B
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Shahin Nazarian/EE450/Summer 2010 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 distorted/ corrupted but when it goes through the repeater, it is cleaned and regenerated and then transmitted to all the nodes connected to hub except the transmitter node Nodes have CSMA/CD layer 2 protocol. All nodes compete with each other to access the channel 8
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Shahin Nazarian/EE450/Summer 2010 Hub Hierarchy 9 1 2 3 4 5 6
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Shahin Nazarian/EE450/Summer 2010 Bridge Bridges are usually used to connect the same type of network, e.g., Ethernet with Ethernet or wireless with wireless. Such bridges are called _________ Transparent bridges do not introduce large delays, because no frame translation is required (from one type to another) One other reason bridges are called transparent is that hosts do not know bridges exist We know that routers ______ transparent, because hosts know about them, and the IP address of the router is configured in them 10
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Shahin Nazarian/EE450/Summer 2010 Bridge (Cont.) The separation of the physical layers in the bridge implies that the physical layer in each segment does not need to be the same; one side can be cable, and the other side fiber However layer 2 is identical on both sides and both use the same MAC procedure ______ routers, bridges ________ change the physical (MAC)
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This note was uploaded on 09/27/2010 for the course EE 450 taught by Professor Zahid during the Summer '06 term at USC.

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EE450-U8-ConnectingDevices_Lecture-Nazarian-Summer10 -...

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