a. For what general class of messages at what layer is ICMP used?

13a.) ICMP is used for ________.

a. Error messages

b. Configuration messages

c. Routing messages

d. None of the above

b. Distinguish between ICMP error advisement and control messages.

13b.) Ping is for ______ messages.

a. Error advisory

b. Supervisory

c. Both A and B

c. What two ICMP message types are used in ping?

13c.) Pinging is to send ICMP________ messages to the target host.

a. Echo request

b. Error advisement

c. Ping

d. Echo

d. What security concern do ICMP error advisement messages and echo response messages bring?

13d.) What security concern do ICMP echo request messages and echo response messages bring?

a. Attackers can disable the other host.

b. Attackers can learn that the other host’s IP address is in use.

c. Attackers can change the other host’s IP address.

d. All of the above

e. Both A and B