1. ICMP messages are carried in TCP segments. True False

2. ICMP messages contain __________ in addition to a type and code field.

a routing table

encrypted data

the first few bytes of an IP datagram

sequence numbers

3. ICMP is used by hosts and routers to communicate __________ information.

application-layer

link-layer

network-layer

transport-layer

4. Which of the following causes Traceroute to stop sending UDP packets?

A port unreachable message is received.

A web page is returned.

The output buffer is empty.

The TTL expires.

5. Consider the Border Gateway Protocol. A gateway router runs the __________ protocol.

eBGP

iBGP

Both of the above are true.

None of the above are true.