ARP Interview Questions

What is the destination mac-address of an ARP request frame

Broadcast

Is ARP used on a PPP link

No

Does ARP contain an IP header

ARP is a layer 2 protocol. It does not use IP header.

What does a switch do when it receives an ARP request frame on one of it’s ports

It adds the source port to it’s mac-address table and broadcasts the frame out to all ports.

Would a ARP request frame generated on a port which is member of VLAN 2, be received on a port which is a member of VLAN 3

ARP is a layer 2 broadcast. VLAN’s are used for segregating broadcast domains. So it would not be received.

Can an ARP packet cross IP networks

ARP is a layer 2 broadcast. It cannot traverse across networks.

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