Answer: B
Explanation: ICMP Type 3/Code 13 indicates communication is administratively prohibited.
(A) ❌ Host Unreachable is a different ICMP code.
(B) ✅ Type 3/Code 13 means the packet was administratively filtered or blocked.
(C) ❌ Port Unreachable is ICMP Type 3/Code 3, not Code 13.
(D) ❌ Protocol Unreachable is a different ICMP code, not Type 3/Code 13.
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The correct answer is B. Administratively Blocked.
ICMP Type 3, Code 13 is a specific error message that indicates that the packet was blocked due to administrative policies, such as firewall rules or access control lists (ACLs). This message is often used to indicate that the destination host or network is not allowed to receive traffic from the source host or network.
Here's a brief overview of the other options:
A. Host Unreachable (ICMP Type 3, Code 1) indicates that the destination host is not reachable, often due to a routing issue or a non-existent host.
C. Port Unreachable (ICMP Type 3, Code 3) indicates that the destination port is not open or listening on the destination host.
D. Protocol Unreachable (ICMP Type 3, Code 2) indicates that the destination host does not support the protocol used in the packet (e.g., TCP, UDP, etc.).
ICMP error messages like these help network administrators diagnose and troubleshoot connectivity issues.
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