Computer Networking
Four routers have to be interconnected in a point-to-point Network. Each pair of root us may connected by a high-speed line, a medium speed line or a low speed line. Find the total number of topologies.

12
48
729
ARP.EXE
81

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Computer Networking
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Flood the network with the frame
Add the source address and port to the MAC address table and forward the frame out the destination port
Discard it and send an error message back to the originating host
Add the destination to the MAC address table and then forward the frame

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Computer Networking
The physical layer, in reference to the OSI model, defines

the virtual circuit interface to packet-switched service
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
the interface between the X.25 network and packet mode device

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Computer Networking
A T-switch is used to

None of these
transmit characters one at a time
echo every character that is received
rearrange the connections between computing equipment
control how messages are passed between computers

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