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• Walk me through the OSI seven-layer model, then explain at what layer a switch,router and hub all operates.

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1. Submitted By: Rekha — October 6, 2006 +1 votes   + -

   7. Application layer
   6. presentation layer
   5. Session layer
   4. Transport layer
   3. Network layer
   2. Datalink layer
   1. Physical layer

   at layer 3(i.e Network layer), a switch,router and hub all operates.

3. Submitted By: olivov — October 6, 2006 not yet rated   + -

   i think hub and switch are layer 2 devices

4. Submitted By: morpheus — October 6, 2006 not yet rated   + -

   a hub is a physical layer device providing absolutey NO intelligence. A switch is a data link layer device which isolates collision domains vs. routers which isolate broadcast domains, giving each connection to a switch a “private” connecting (no collisions/contention). Think of a switch as a multi-port bridge of sorts, allocation a time slice to each connection, but very quickly.

5. Submitted By: Moazzam — November 2, 2007 not yet rated   + -

   Router works on Layer 3, Switch on Layer 2 and Hub on Layer1 (not on Layer 2 and 3 as suggested above) because it doesn’t make any routing or switching decisions just transfer that on devices attached on all its ports.

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