A user issues a ping 198.51.100.25 command and receives a response that includes a code of 2. What does this code represent?
- port unreachable
- host unreachable
- protocol unreachable
- network unreachable
Explanation: When a host or gateway receives a packet that it cannot deliver, it can use an ICMP Destination Unreachable message to notify the source that the destination or service is unreachable. The message will include a code that indicates why the packet could not be delivered. These are some of the Destination Unreachable codes for ICMPv4:
0 : net unreachable
1 : host unreachable
2 : protocol unreachable
3 : port unreachable
Exam with this question: Networking Devices and Initial Configuration Module 12.3.4 ICMP Quiz
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