Question

Which route will a router use to forward an IPv4 packet after examining its routing table for the best match with the destination address?

A. a level 1 child route
B. a level 1 parent route
C. a level 1 ultimate route
D. a level 2 supernet route

Answer 1

A router will use the most specific route (longest prefix) in its routing table to forward an IPv4 packet.

Step-by-step explanation:

When a router receives an IPv4 packet, it examines its routing table to determine the best route to forward the packet. It does this by matching the destination address of the packet with the entries in its routing table. The router looks for the most specific, or longest prefix, match in its routing table. This means it will choose a route that has the longest matching network prefix. For example, if the routing table has two entries with destination addresses 192.168.1.0/24 and 192.168.1.0/16, the router will choose the route 192.168.1.0/24 because it is more specific and has a longer prefix.