Cisco 100-105 Exam

Which two of these functions do routers perform on packets? (Choose two.)

  • A. update the Layer 3 headers of outbound packets so that the packets are properly directed to valid next hops
  • B. update the Layer 2 headers of outbound packets with the MAC addresses of the next hops
  • C. examine the Layer 3 headers of inbound packets and use that information to determine the complete paths along which the packets will be routed to their ultimate destinations
  • D. examine the Layer 3 headers of inbound packets and use that information to determine the next hops for the packets
  • E. examine the Layer 2 headers of inbound packets and use that information to determine the next hops for the packets
  • F. update the Layer 3 headers of outbound packets so that the packets are properly directed to their ultimate destinations
Answer: Option B. D.
Explanation: 

This is the basic function of the router to receive incoming packets and then forward them to their required destination. This is done by reading layer 3 headers of inbound packets and update the info to layer 2 for further hopping.

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