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A router uses...

Question

A router uses the following routing table:

Destination Mask Interface

144.16.0.0 255.255.0.0 eth0

144.16.64.0 255.255.224.0 eth1

144.16.68.0 255.255.255.0 eth2

144.16.68.64 255.255.255.224 eth3

A packet bearing a destination address 144.16.68.117 arrives at the router. On which interface will it be forwarded?

A

eth3

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B

eth0

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C

eth2

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D

eth 1

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Solution

The correct option is C eth2
When a packet comes to a router, it matches destination network with those available in routing tables to route the packet.
The route which has longest network address match will be used to route the packet.
The longest matching mask is 255.255.255.0
and hence forwarded to eth2.

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