Home » Cisco » 100-105 » 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?
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 4 protocol
B. Layer 3 IP address
C. Layer 2 frame header and trailer
D. Layer 5 session
Correct Answer: C
Explanation/Reference:
Explanation:
During the transmission of a packet from source to destination, only Layer 2 information is replaced in the path. Layer 3 information remains the same (except when NAT is used).