312-50V9 · Question #504
What does a type 3 code 13 represent?(Choose two.
The correct answer is B. Destination unreachable D. Administratively prohibited. ICMP Type 3 Code 13 indicates a packet was administratively prohibited, meaning a firewall or ACL blocked it, which falls under the broader Destination Unreachable message type.
Question
What does a type 3 code 13 represent?(Choose two.
Options
- AEcho request
- BDestination unreachable
- CNetwork unreachable
- DAdministratively prohibited
- EPort unreachable
- FTime exceeded
How the community answered
(53 responses)- A2% (1)
- B89% (47)
- C4% (2)
- E6% (3)
Why each option
ICMP Type 3 Code 13 indicates a packet was administratively prohibited, meaning a firewall or ACL blocked it, which falls under the broader Destination Unreachable message type.
Echo Request is ICMP Type 8, used in ping operations, and is unrelated to Type 3.
ICMP Type 3 is the Destination Unreachable message class, which encompasses all codes from 0 through 15 that indicate a packet could not be delivered for various reasons.
Network Unreachable is ICMP Type 3 Code 0, not Code 13.
Code 13 within Type 3 specifically means Communication Administratively Prohibited, which is returned when a firewall rule or router ACL explicitly blocks the traffic rather than the destination being unreachable for routing reasons.
Port Unreachable is ICMP Type 3 Code 3, indicating no service is listening on the destination port.
Time Exceeded is ICMP Type 11, returned when a packet's TTL reaches zero in transit.
Concept tested: ICMP Type 3 Code 13 administratively prohibited message
Source: https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xhtml
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