ICMP Message Types

Question 1

Echo Reply

Answer 1

0

Question 2

Destination Unreachable

Answer 2

3

Codes:

0—Destination network unreachable

1—Destination host unreachable

6—Network unknown

7—Host unknown

9—Network administratively prohibited 10—Host administratively prohibited

13—Communication administratively prohibited

Question 3

Source Quench

Answer 3

4

Question 4

Redirect

Answer 4

5

Sent when there are two or more gateways available for the sender to use, and the best route available to the destination is not the configured default gateway.

Codes:

0—Redirect datagram for the network

1—Redirect datagram for the host

Question 5

ECHO Request

Answer 5

8

Question 6

Time Exceeded

Answer 6

11