CCNA And CCENT Cisco Certification Exam Training Questions:
10 Questions On Static Routing, Debugs, And RIP
By Chris Bryant, CCIE #12933
You'll certainly see questions on static routing, RIP, and various debugs on your CCNA and CCENT exams - and I can guarantee you'll use these skills in the real world!
To help you with both your exam prep and real-world network situations, here are 10 questions on these vital CCNA exam topics. Some have multiple choices and some do not!
Enjoy working with these questions - the answers are at the bottom of the page.
Five Minutes From Now, You Can Be Studying For Exam Success Just As Thousands Of Other Candidates Around The World Have - With Chris Bryant, CCIE #12933 With You Every Step Of The Way - With The Ultimate CCNA Exam Study Package!
If You Prefer Video Training, You Can Earn Your CCNA Using My Exclusive CCNA Video Boot Camp - The Only CBT That Brings You 25 Hours Of Instruction From Chris Bryant, CCIE #12933, AND Free Membership In My Exclusive Online Cisco Certification Forum, Where You Can The Instructor Questions Personally!
Just Click The Image For More Details And Video Samples!
1. What two commands resulted in the following output?
IP: s=172.12.123.3 (local), d=172.12.123.2 (Serial0), len 100, sending
IP: s=172.12.123.1 (Serial0), d=172.12.123.3 (Serial0), len 56, rcvd 3
IP: s=172.12.123.2 (Serial0), d=172.12.123.3 (Serial0), len 100, rcvd 3
A. debug frame lmi
B. debug packet length
C. debug ip packet
D. ping 172.12.123.1
E. ping 172.12.123.2
F. ping 172.12.123.3
2. Identify the true statements regarding the following output.
IP: s=172.12.123.3 (local), d=2.2.2.2, len 100, unroutable
IP: s=172.12.123.3 (local), d=2.2.2.2, len 100, unroutable
IP: s=172.12.123.3 (local), d=2.2.2.2, len 100, unroutable
IP: s=172.12.123.3 (local), d=2.2.2.2, len 100, unroutable
IP: s=172.12.123.3 (local), d=2.2.2.2, len 100, unroutable
A. A debug command is running on the local router.
B. A debug command is not running on the local router.
C. The word unroutable indicates that the packets are not leaving the local router.
D. The command output indicates that these packets are leaving the router.
E. The word unroutable indicates that the remote interface with the IP address 2.2.2.2 is administratively shut down.
3. What command was just run on this router?
R3#
All possible debugging has been turned off
4. A valid ip route command can end with which of the following?
A. The name of the exit interface on the local router.
B. The IP address of the exit interface on the local router.
C. The IP address of the next-hop router.
D. The name of the interface on the next-hop router that should receive the packets.
5. Briefly describe a floating static route.
6. Identify the true statements regarding the following command output.
R3#
RIP: sending update to 224.0.0.9 via Serial0 (172.12.123.3)
172.12.123.0/24 -> 0.0.0.0, metric 1, tag 0
1.1.1.1/32 -> 172.12.123.1, metric 2, tag 0
2.2.2.2/32 -> 172.12.123.2, metric 3, tag 0
3.3.3.3/32 -> 0.0.0.0, metric 16, tag 0
A. The debug ip rip command is running.
B. The debug ip packet command is running.
C. The ping ip rip command was used.
D. Route poisoning is in effect.
E. Split horizon is in effect.
F. At least one of these routes is a floating static route.
G. This is a RIP version 1 update.
H. This is a RIP version 2 update.
7. Identify the true statements comparing RIP versions 1 and 2.
A. The destination address of the routing updates is the same.
B. VLSM is supported.
C. Subnet mask information is carried in the routing updates.
D. The metric used for route poisoning is the same.
8. What routing algorithm is used by RIP?
A. SPF
B. Bellman-Ford
C. Dijkstra
D. DUAL
9. A default RIP configuration sends what version(s) of routing updates?
A. Version 1 only.
B. Version 2 only.
C. Both versions 1 and 2.
D. There is no default setting; this must be manually configured.
10. A default RIP configuration accepts what version(s) of routing updates?
A. Version 1 only.
B. Version 2 only.
C. Both versions 1 and 2.
D. There is no default setting.
Five Minutes From Now, You Can Be Studying For Exam Success Just As Thousands Of Other Candidates Around The World Have - With Chris Bryant, CCIE #12933 With You Every Step Of The Way - With The Ultimate CCNA Exam Study Package!
If You Prefer Video Training, You Can Earn Your CCNA Using My Exclusive CCNA Video Boot Camp - The Only CBT That Brings You 25 Hours Of Instruction From Chris Bryant, CCIE #12933, AND Free Membership In My Exclusive Online Cisco Certification Forum, Where You Can The Instructor Questions Personally!
Just Click The Image For More Details And Video Samples!
Here are the answers!
1. (C, E). The debug running is debug ip packet. The ping was sent to 172.12.123.2, as shown by the first line of the debug (d=172.12.123.2).
2. (A, C). As in Question 1, this is the output of debug ip packet. However, this time there is no sending or rcvd in the debug output. That's because no packets are leaving the router, so we're sure not going to get any back!
We know the packets aren't leaving the router, since the word unroutable appears in the debug output. This indicates that no entry in the routing table exists for this particular destination, in this case 2.2.2.2.
3. The command undebug all was just run, resulting in the All possible debugging has been turned off message.
4. (A, C). A valid ip route command can be configured with the name of the local exit interface or the IP address of the next-hop router.
5. A floating static route is a static route with an administrative distance higher than that of the routing protocol in use. In this way, the floating static route will only appear in the routing table if the dynamically learned route is lost.
Let's use the following routing table for an example.
R1#show ip route rip
172.12.0.0/16 is variably subnetted, 2 subnets, 2 masks
R 172.12.23.0/27 [120/1] via 172.12.123.2, 00:00:04, Serial0
[120/1] via 172.12.123.3, 00:00:04, Serial0
Let's say we want to create a static route to 172.12.23.0 /27 with a next-hop IP address of 210.1.1.3, but it will only be used if these two dynamically learned routes are removed from the table.
If we create a regular static route, the AD of the static route will be 1, and that's much lower than the AD of these RIP routes!
Therefore, the static route would be placed into the table immediately and the RIP routes would be removed.
To create a floating static route, we need to use the distance option at the end of the ip route command. We really just need to set an AD of 121 for the static route, but in this case we'll set one of 200.
R1(config)#ip route 172.12.23.0 255.255.255.224 210.1.1.3 ?
<1-255> Distance metric for this route
name Specify name of the next hop
permanent permanent route
tag Set tag for this route
<cr>
R1(config)#ip route 172.12.23.0 255.255.255.224 210.1.1.3 200
Using the option to change the static route's administrative distance (that's what "distance metric for this route" refers to) creates the static route, but it will not appear in the routing table unless the matching RIP routes leave the table. Right now, the static route is not in the table:
R1#show ip route
< code table removed for clarity >
172.12.0.0/16 is variably subnetted, 3 subnets, 2 masks
C 172.12.13.0/24 is directly connected, Serial1
R 172.12.23.0/27 [120/1] via 172.12.123.2, 00:00:21, Serial0
[120/1] via 172.12.123.3, 00:00:05, Serial0
C 172.12.123.0/24 is directly connected, Serial0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Ethernet0
Serial0 will now be closed.
R1(config)#int s0
R1(config-if)#shutdown
As a result, the RIP routes are lost - note the exit interface for the RIP routes is the interface we just closed. As a result, the floating static route is now in the table.
Note the administrative distance in the brackets is now 200 and the next-hop IP address for that route has changed. A quick ping shows that we still have connectivity to the remote network.
R1#show ip route
< code table removed for clarity >
172.12.0.0/27 is subnetted, 1 subnets
S 172.12.23.0 [200/0] via 210.1.1.3
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Ethernet0
C 210.1.1.0/24 is directly connected, Serial1
R1#ping 172.12.23.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.12.23.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/36 ms
When we reopen R1's S0 interface, the RIP updates will again be received by R1 and the floating static route will be removed from the table due to its higher AD.
R1(config)#int s0
R1(config-if)#no shutdown
R1#show ip route
< code table removed for clarity >
172.12.0.0/16 is variably subnetted, 2 subnets, 2 masks
R 172.12.23.0/27 [120/1] via 172.12.123.2, 00:00:17, Serial0
[120/1] via 172.12.123.3, 00:00:00, Serial0
C 172.12.123.0/24 is directly connected, Serial0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Ethernet0
C 210.1.1.0/24 is directly connected, Serial1
And that's a floating static route!
6. (A, D, H). This is the output of debug ip rip. Route poisoning is in effect, since one of the routes has a hop count of 16 - that's "unreachable" with RIP routes. We can tell this is a RIPv2 update since it's multicast to 224.0.0.9. RIPv1 updates are broadcast to 255.255.255.255.
7. (D). One of the few similarities between RIP v1 and v2 is that it uses the same metric for route poisoning, the same one we saw in Question 6 - 16.
8. (B). RIP uses the Bellman-Ford algorithm. OSPF uses SPF (also called the Dijkstra algorithm), and EIGRP uses DUAL.
9. (A). The default for both versions of RIP is to send only V1 updates.
10. (C). The default for both version 1 and 2 of RIP is to accept both V1 and V2 updates.
Five Minutes From Now, You Can Be Studying For Exam Success Just As Thousands Of Other Candidates Around The World Have - With Chris Bryant, CCIE #12933 With You Every Step Of The Way - With The Ultimate CCNA Exam Study Package!
If You Prefer Video Training, You Can Earn Your CCNA Using My Exclusive CCNA Video Boot Camp - The Only CBT That Brings You 25 Hours Of Instruction From Chris Bryant, CCIE #12933, AND Free Membership In My Exclusive Online Cisco Certification Forum, Where You Can The Instructor Questions Personally!
Just Click The Image For More Details And Video Samples!
Look for other CCNA, CCENT, and CCNP certification question sets coming soon, along with Server 2008 questions coming in July and August. You'll find new sets on the Cisco CCNA and CCNP practice exam question page, and they'll also be announced in my Cisco certification blog and in my newsletter as well.
To your success,
Chris Bryant
CCIE #12933
chris@thebryantadvantage.com
|
