Computer Networking
Which of the following is a wrong example of network layer?

X.25 level 2-ISO
X.25 Packet Level Protocol (PLP)-ISO
Source routing and domain naming-USENet
Internet Protocol (IP) - ARPANET

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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?

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
Flood the network with the frame

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