Sign Up
Log In
Home
discussion
Exam 100-105 Question id=540 Routing Fundamentals

When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does it replace?

A. Layer 2 frame header and trailer
B. Layer 3 IP address
C. Layer 5 session
D. Layer 4 protocol
previous question
next question

Explanation:
What does a router do with a packet received from one network and destined for another network? The router performs the following three major steps:

  • Step 1. De-encapsulates the Layer 3 packet by removing the Layer 2 frame header and trailer.
  • Step 2. Examines the destination IP address of the IP packet to find the best path in the routing table.
  • Step 3. If the router finds a path to the destination, it encapsulates the Layer 3 packet into a new Layer 2 frame and forwards the frame out the exit interface.
Reference


WARNING

the answers are mixed, do not specify in the comment number or the letter of the answer
please write answer#A instead A, answer#B instead B...
Subject:

only logged users can write comments