A user issues a ping 198.51.100.5 command and receives a response that includes a code of 3. What does this code represent?
- network unreachable
- host unreachable
- port unreachable
- protocol 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
Related exam: Networking Essentials 3.0 Checkpoint Exam: Configure Cisco Devices
