9. Exploring the Functions of Routing

Question 1

Networks to which a router is attached are called what?

Answer 1

Local or Directly Connected networks.

Question 2

List the four primary types of memory found in routers.

Answer 2

RAM, NVRAM, ROM, Flash.

Question 3

List the Two Primary Functions of a Router.

Answer 3

Path Determination and Packet Forwarding.

Question 4

What do Routers use to determine how to forward packets?

Answer 4

A Routing Table.

Question 5

Which routing table element describes the IPv4 address of the successive neighboring device?

Answer 5

Next Hop

Question 6

List the four types of entries that might be found in a routing table.

Answer 6

1. Directly Connected Networks
2. Dynamic Routes
3. Static Routes
4. Default Routes.

Question 7

List the three parts of a directly connected routing table entry.

Answer 7

1. Route Source
2. Destination Network
3. Outgoing Interface

Question 8

List the seven parts of a dynamic routing table entry.

Answer 8

1. Route Source
2. Destination Network
3. Adminitrative Distance
4. Metric
5. Next-hop
6. Route time stamp
7. Outgoing Interface

Question 9

Route Entries that are manually entered directly into the configuration of the router are called what?

Answer 9

Static Routes

Question 10

This is an optional entry used by the router if a packet does not match any other entry.

Answer 10

Default Route

Question 11

What is Administrative Distance?

Answer 11

Administrative Distance represents the “Trust-Worthiness” or a route.

Question 12

What is the Administrative Distance of a Static Route?

Answer 12

1

Question 13

Given separate routes to the same destination, a router will pick the route with the ________ administrative distance.

Answer 13

Lowest

Question 14

What is the Administrative Distance of a Directly Connected Network?

Answer 14

0

Question 15

The routing table entry whose leading address bits matches the largest number of the packet destination address bits is called what?

Answer 15

The Longest Prefix Match.

Question 16

Name the Seven Parts of a Dynamic Routing Table Entry

Example: O 172.16.1.0/24 [110/2] via 192.168.10.2, 00:03:23, GigabitEthernet0/1

Answer 16

1. Route Source
2. Destination Network
3. Administrative Distance
4. Metric
5. Next-hop
6. Route time stamp
7. Outgoing interface

Question 17

What is the adminitrative distance of a Static Route?

Answer 17

1

Question 18

What is the administrative distance of a Default Route?

Answer 18

1

Question 19

What is the command to display the IPv4 routing table of a router?

Answer 19

Router# show ip route

Question 20

What does a Route Source with the code “C” mean?

Answer 20

“C” indicates a directly connected network.

Question 21

What does a Route Source with the code “L” mean?

Answer 21

“L” indicates local interfaces within connected networks.

Question 22

What does a Route Source with the code “R” mean?

Answer 22

“R” indicates RIP

Question 23

What does a Route Source with the code “O” mean?

Answer 23

“O” indicates OSPF

Question 24

What does a Route Source with the code “D” mean?

Answer 24

“D” indicates EIGRP.

(Stands for Diffusing Update Algorithm or DUAL)

Question 25

What does a Route Source with the code “S” mean?

Answer 25

“S” indicates static routes

Question 26

What does a Route Source with the code that has an asterisk (*) mean?

Answer 26

An asterisk indicates that this route is a candidate for the default route.

Question 27

What is the Longest Prefix Match?

Answer 27

The routing table entry whose leading address bits matches the largest number of the packet destination address bits.