312-50V11 · Question #611
What does a type 3 code 13 represent?(Choose two.
The correct answer is B. Destination unreachable D. Administratively prohibited. ICMP Type 3 is the Destination Unreachable message class, and Code 13 within it specifically means the packet was administratively prohibited by a filtering policy.
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
(33 responses)- A6% (2)
- B79% (26)
- E12% (4)
- F3% (1)
Why each option
ICMP Type 3 is the Destination Unreachable message class, and Code 13 within it specifically means the packet was administratively prohibited by a filtering policy.
Echo request is ICMP Type 8, used by the ping utility, and is entirely unrelated to Type 3 Destination Unreachable messages.
ICMP Type 3 is the top-level Destination Unreachable message category, encompassing all conditions where a packet cannot be delivered to its intended destination.
Network unreachable is ICMP Type 3 Code 0, not Code 13.
Code 13 within ICMP Type 3 is defined by IANA as 'Communication Administratively Prohibited,' meaning an ACL, firewall rule, or router policy explicitly blocked the packet rather than a routing or reachability failure.
Port unreachable is ICMP Type 3 Code 3, a different code from Code 13.
Time exceeded is ICMP Type 11, a separate message type generated when a packet's TTL reaches zero, not a subtype of Type 3.
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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