Volume 1 - Chapter 20: Troubleshooting IPv4 Routing

Question 1

What protocol is used by pings?

Answer 1

Internet Control Message Protocol (ICMP)

Question 2

Describe the difference between a ping and an extended ping.

Answer 2

A standard ping does not test a device’s default gateway, whereas an extended ping will.

For example, an extended ping could be from a device on 192.168.10.0/24 to a device on another subnet.

Question 3

What is the command used on a router to enable the use of DNS servers for resolving hostnames?

Answer 3

ip domain lookup

Question 4

What is the command used on a router to set the default domain name used by the device?

Answer 4

ip domain name domainname

or on older devices:

ip domain-name domainname

Question 5

What is the command used on a router to display the local hostnames (DNS cache)?

Answer 5

show hosts

Question 6

What is the command used on a router to configure a static local DNS entry?

Answer 6

ip host hostname ipaddress

Question 7

How does traceroute use ICMP messages to find the path of a route?

Answer 7

By incrementing the time to live counter

Question 8

What command(s) in Windows can be used to perform a traceroute?

Answer 8

tracert

or

pathping

Question 9

What command(s) in Linux & MacOS can be used to perform a traceroute?

Answer 9

traceroute