Cisco CCNA Certification Practice Questions:

Distance Vector Routing & Static Routing

By Chris Bryant, CCIE #12933

To help you with your CCNA certification exam prep, here are 10 free questions on distance vector routing and static routing. Answers and explanations are at the bottom of the page. Enjoy!

1. You have just booted a Cisco router. After you open the interfaces, what routes should you expect to see in the routing table?  

A. Connected networks only.

B. Connected networks and a single default static route.

C. None - the routing table is empty until a routing protocol populates it.

D. None of these.

2. The command to create a static route in the routing table is ____________ .

3. Which of the following statements will create a static route that will send packets to the destination IP address 2.2.2.2, but no others?  

A. ip route 2.2.2.2 255.255.255.255 172.12.123.1

B. ip route 2.2.2.2 0.0.0.0 172.12.123.1

C. ip route 2.2.2.2 172.12.123.1 255.255.255.255

D. ip route 2.2.2.2 172.12.123.1 0.0.0.0

E. ip route 0.0.0.0 0.0.0.0 172.12.123.1

F. ip route 0.0.0.0 172.12.123.1 0.0.0.0

4. Which of the following static routes will send only traffic destined for the 100.1.1.0 /24 network to the next-hop IP address 172.1.1.1 ?  

A. ip route 100.1.1.0 255.255.255.0 172.1.1.1

B. ip route 100.1.1.0 0.0.0.255 172.1.1.1

C. ip route 100.1.1.0 172.1.1.1 255.255.255.0

D. ip route 100.1.1.0 172.1.1.1 0.0.0.255

5. Short answer: What letter in the routing table code indicates a static host route?

6. You configure the static route shown here, and then attempt to ping that remote destination. Based on the ping output shown, what is most likely the problem?  

R3(config)#ip route 2.2.2.2 255.255.255.255 172.12.123.1  

R3#ping 2.2.2.2  

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:

U.U.U

Success rate is 0 percent (0/5)   

A. This is an illegal IP ROUTE command, so the local router has no route to 2.2.2.2.

B. The downstream router located at 172.1.1.1 does not have a route to 2.2.2.2.

C. The exit interface of 172.1.1.1 is in fact the exit interface, so routing will fail.

D. The exit interface is closed.

7. Fill in the blanks: The full command to see all debugs running on the router is ____________ , and the full command to turn off all running debugs is ____________ .

8. You are configuring router LA, and want to configure a gateway of last resort to router NY.  

Router LA will be sending this traffic out its interface serial0, which has an IP address of 172.1.1.1.  

Router NY will be receiving this information on its interface serial1, and this interface has an IP address of 189.12.12.12.  

Which of the following statements will successfully configure a gateway of last resort?

A. ip route 0.0.0.0 0.0.0.0 189.12.12.12

B. ip route 0.0.0.0 0.0.0.0 serial1

C. ip route 0.0.0.0 0.0.0.0 serial0

D. ip route 255.255.255.255 255.255.255.255 172.1.1.1

E. ip route 255.255.255.255 255.255.255.255 serial1

F. ip route 255.255.255.255 255.255.255.255 189.12.12.12

G. ip route 255.255.255.255 255.255.255.255 serial0

H. ip route 0.0.0.0 0.0.0.0 172.1.1.1

9. Fill in the blank: The default behavior of a distance vector protocol that does not allow a router to send a route advertisement out the same interface upon it was originally learned about is ____________ .

10. Look at the configuration below and identify the true statement.  

R3#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R3(config)#router rip

R3(config-router)#network 172.12.0.0  

A. A subnet mask must follow "172.12.0.0".

B. The RIP version number must follow "172.12.0.0".

C. A wildcard mask must follow "172.12.0.0".

D. Nothing should follow "172.12.0.0".

Here are the answers!

1. C - When you first view a routing table on a Cisco router after opening the interfaces, you'll see only the directly connected networks.

2. That command is ip route.

3. B. Of the six statements presented here, only the following will send packets to 2.2.2.2 but will route no other packets:

ip route 2.2.2.2 255.255.255.255 172.12.123.1

2.2.2.2 = final destination

255.255.255.255 = a 32-bit subnet mask, this means that only the specific destination preceding it will match this statement.

172.12.123.1 = the next-hop IP address

There is a default static route presented in the choices, but it would match all possible remote destinations, not just 2.2.2.2 as the question asked.

4. A. Only this route fulfills the requirements:

ip route 100.1.1.0 255.255.255.0 172.1.1.1

100.1.1.0 = remote network destination

255.255.255.0 = subnet mask

172.1.1.1 = next-hop IP address

5. A static host route is a route used to reach one and only one remote destination, such as this: ip route 1.1.1.1 255.255.255.255 172.18.13.201

These routes are indicated just as other static routes are - with "S".

An asterisk indicates a candidate default route.

6. B. This output is the result of a downstream router not having a path to 2.2.2.2. The "U" refers to "unreachable", and this is one of those rare times that a ping returns more than one character.

The router would not let you enter 172.1.1.1 for the IP ROUTE command if that were an interface on that router itself.

There is no problem with that IP ROUTE command; it is a static host route.

7. The commands are shown in action here:

R3#show debug
Generic IP:
IP packet debugging is on
R3#undebug all
All possible debugging has been turned off

8. A, C. These are the only two routes that will work:

ip route 0.0.0.0 0.0.0.0 serial0

ip route 0.0.0.0 0.0.0.0 189.12.12.12

To configure a gateway of last resort, we create a default static IP route.

The default static route begins with "ip route 0.0.0.0 0.0.0.0", so the answers with 255.255.255.255 for those two values can be eliminated.

A static route, default or not, follows this syntax:

ip route < destination_network > < subnet_mask > < next_hop_IP OR exit_interface >

If you configure an IP address at the end of this command, it must be the next hop IP. If you configure an interface type, it must be the local exit interface.

In this situation, the route "ip route 0.0.0.0 0.0.0.0 serial0" is not a great choice, but it would configure the gateway of last resort. Configuring a next-hop IP address is a preferred method and is easier to troubleshoot.

9. Split horizon prevents a router interface from advertising a route out the same interface upon which it was learned about in the first place.

10. RIPv1 does not understand VLSM, while RIPv2 does.

To your success,

Chris Bryant

CCIE #12933

chris@thebryantadvantage.com