Which of the following isare true regarding routing tables A

Which of the following is/are true regarding routing tables?

A. The next-hop address is irrelevant to router operation.

B. The next-hop address is used to find an address for the new Layer 2 frame header.

C. The next-hop address is used to accept routing updates only.

D. If there is no entry for the packet’s destination network address, the packet will be forwarded out the closest matching interface.

E. If there is no entry for the packet’s destination network address, the packet will be discarded.

Solution

B and E are correct. When the router makes a decision as to which interface to send a message out, it performs an ARP to determine the Physical layer address for the new frame. If there is no matching entry in the routing table, packets are discarded.

A, C, and D are incorrect. A is incorrect because next-hop addresses are used by routers to determine the address for the new frame and are not used solely for routing updates. C is incorrect because there must be an entry for the packet’s destination network address. D is incorrect because packets with no matching entry in the routing table are discarded, not forwarded.