Chapter 20

Question 1

extended ping

Answer 1

An IOS command in which the ping command accepts many other options besides just the destination IP address.

Question 2

forward route

Answer 2

From one host’s perspective, the route over which a packet travels from that host to some other host.

Question 3

ICMP echo reply

Answer 3

One type of ICMP message, created specifically to be used as the message sent by the ping command to test connectivity in a network. The ping command expects to receive these messages from other hosts, after the ping command first sends an ICMP echo request message to the host.

Question 4

ICMP echo request

Answer 4

One type of ICMP message, created specifically to be used as the message sent by the ping command to test connectivity in a network. The ping command sends these messages to other hosts, expecting the other host to reply with an ICMP echo reply message.

Question 5

reverse route

Answer 5

reverse route
From one host’s perspective, for packets sent back to the host from another host, the route over which the packet travels.

Question 6

traceroute

Answer 6

traceroute
A program available on many systems that traces the path that a packet takes to a destination. It is used mostly to debug routing problems between hosts.