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
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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:

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