CCNA EIGRP LAB Question
Question
After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.
The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.
Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.
IP addresses are listed in the chart below.
| R1 Fa0/0: 192.168.77.33 S1/0: 198.0.18.6 S0/1: 192.168.60.25 S0/0: 192.168.36.13 |
R2 Fa0/0: 192.168.60.97 Fa0/1: 192.168.60.113 S0/0: 192.168.36.14 |
| R3 Fa0/0: 192.168.77.34 Fa0/1: 192.168.60.65 Fa1/0: 192.168.60.81 |
R4 Fa0/0: 192.168.60.129 Fa0/1: 192.168.60.145 S0/1: 192.168.60.26 |
Answer and explanation
(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://www.9tut.com/download/9tut.com_CCNA_EIGRP_sim_question.zip)
We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command
From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.
(You should check the AS numbers on other routers for sure)
To solve this problem, we simply re-configure router R3 with the following commands:
R3>enable (you have to enter cisco as its password here)
R3#configure terminal
R3(config)#no router eigrp 22
R3(config)#router eigrp 212
R3(config-router)#network 192.168.60.0
R3(config-router)#network 192.168.77.0
R3(config-router)#no auto-summary
R3(config-router)#end
R3#copy running-config startup-config
Check R1 router with the show running-config command:
Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router
R1>enable (you have to enter cisco as its password here)
R1#configure terminal
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#end
R1#copy running-config startup-config
Now the whole network will work well. You should check again with ping command from router R3 to other routers!
Modifications:
Maybe in this EIGRP Sim you will see the “passive-interface …” command somewhere in R1 configuration. If the link between R1 to R2; or R1 to R3; or R1 to R4) routers has the “passive interface” then we have to remove it with the “no passive-interface …” command because it prevents EIGRP update from being sent on that interface. But if the “passive interface” is applied to the link between R1 and ISP router like this:
R1:
!
router eigrp 212
passive-interface s1/0
!
then we just leave it. Don’t use the “no passive-interface s1/0″ on R1 because the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “ip default-network” command in R1 are correct so that all the routers (R1, R2, R3, R4) can access the Internet.
(Note: The “ip default-network” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too). In the exam you will see these lines in R1 configuration:
!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
If you want to learn more about “ip default-network” command please read: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml
I read recent comments and realized that you will see the “passive-interface” in the link between R1 & ISP router so just leave it.
Note: Also some readers confuse about if we should use the wildcard masks on the “network” statements under EIGRP process or not. For example should we use:
router eigrp 212
network 192.168.77.0 0.0.0.3
The answer is: we can use wildcard masks or not, it does not matter. Not having a wildcard mask does not make the routes conflicting. The “network …” command in EIGRP (and OSPF, RIP) does not means “advertise this network” but means “If I has interface(s) belongs to this network please turn on EIGRP on that interface. Therefore when you don’t use wildcard mask EIGRP will turn on EIGRP on all interfaces that belongs to the network you specify in the “network …” command.
You should only use wildcard mask on EIGRP if you have 2 or more interfaces that belong to the same major networks but you don’t want to run EIGRP on all of them. For example if your router has 2 interfaces whose IP addresses are 192.168.30.1/28 and 192.168.30.17/28 but you only want to run EIGRP on the first interface, you can type “network 192.168.30.0 0.0.0.15″ under EIGRP process.
Other lab-sims on this site:
CCNA Configuration SIM Question (RIPv2 SIM)
hey guys…
I read here alot of comments about this lab.. aside from the fact that instead of AS 212 can be 221.. what are the other changes to be aware of? i am training myself to do the exact configuration as it is here in pink color.. am I missing something? Please help
Hello everybody,
Elhamdulillah (All praise is due to Allah), Allah’a şükürler olsun (Thanks to Allah ) I passed the CCNA exam on the 22/April/2015. I want to provide some advice for the exam. First of all, WATSON, EXAMTUT, 9tut questions are correct. This dumps are valid.
1- There was total 51 questions. {2 simulations(EIGRP, ACL2 Modification1), 1 simlet (CCNA Access List Sim- ACL1), There was no drog and drop}
2- There are some small changes in questions. For example, place of answers are different. IP address can be different in simulation questions. AS numbers can be different. Pay attention to them.
3- There was a new question about Etherchannel.
Please forgive me for my bad English. I wish you success.
and
Thank you very much 9tut.
thanks @poyraz for the info, am having my exam next week. about that new question, where can i get it????
Wrote Ccna today morning I cleared the exam t, the same from eigrp 12 came .thanks 9tut. Keep up the good work . Study 9tut pass easily.
Hi @nickson,
You can look at the exam preparation sites (like as examcollction)… If you ask about the question of EtherChannel, I saw that question on the exam first time.
Just passed now. (2 mins to this post). Got acl sims and eigrp
@polimi congratulation and I hope i’ll pass tomorrow and by with u in the other site
enjoy ur day
Hello guys who spent the CCNA 200-120 recently and can tell me what the laboratory has found in the exam?
Thanks
Hello guys.. I want to book the CCNA exam. On CISCO site i found two CCNA EXAMS..
Exam:
200-120: CCNA Cisco Certified Network Associate (803)
Exam:
200-120PT: CCNA Test Bundle + MeasureUp Practice Test (includes 200-120 exam and practice test)
Which one you guys choose when you did you exam???
Please help …
Hello everybody,
this lab is on the exam ?
Thanks
hey guys for the lab sims I got ACL 1 and ACL 2 [both cases (1 + 2)] and for the EIGRP lab is is this one or the EIGRP Troubleshoot? please reply fast because I take the CCNA 200-120 the 7th, thanks!
Good Luck Dustin. I am doing CCNA 200-120 on 7th too….
Hey guys
Morning,,,
I am on my way to do my CCNA exam.
If any one has any questions for me about the test feel free to email me.
torontoman66@gmail.com
Please wish me good luck. I studied everything on 9 tut but still nervous.
Peace
Hey guys
Morning,,,
I am on my way to do my CCNA exam.
I will post a feed back here after my exam
Please wish me good luck. I studied everything on 9 tut but still nervous.
Peace
I just did my exam today and scored 1000/1000 if you need help email me
you cant find any better place to study ccan than this site
Hi Guys and Gals,
I have taken CCNA 200-120 on 12th May 2015 in Penang. The SIMs that I got were ACL, ACL2 MOD3 and EIGRP 212(mine was AS 222).
Got 1000/1000. Just study and go through all the questions and SIMs in 9tut and you will surely pass.
hey guys… I did my CCNA 200-120 on the 9th of may.. i passed, though i messed up with the EIGRP sim.. i had a problem, i tried to enter the “CONFIG T” command but the router keep telling me that it is blocked… please have any one experience it before and what might be the cause of it.
i guys
i pass in my exame today 14/05/2015 with 1000/1000 this lab eigrp was there yes. but mine was eigrp 23 ( the wrong AS entered in the Home2 was 22.)
Question, the lab says: “Access to the router CLI can be gained by clicking on the appropriate host”. Does this mean we have to connect to the router in question through a serial connection from the Hosts or using something like putty? Or we can open the terminal directly by clicking on the Router?
hi guys. I tried to troubleshoot the eigrp by changing the as number. I followed the commands but still my ping is unsuccessful with the other routers. can any one help me guys?
i passed the exam today with 1000/1000
mine EIGRP as 221
Most of the questions came from 9tut. Given below is one of the new question.
Q-Two routers named Atlanta and Brevard are connected via their serial interfaces as illustrated, but they are unable to communicate. The Atlanta router is known to have the correct configuration.
Given the partial configurations, identify the fault on the Brevard router that is causing the lack of connectivity.
A. incompatible IP address
B. insufficient bandwidth
C. incorrect subnet mask
D. incompatible encapsulation
E. link reliability too low
F. IPCP closed
Answer: D
Pls do share the dumps to my id spoorthyshetty02@gmail.com. Thank you
I passed exam today with 958/1000 This question had came!.
Just passed CCNA 200-120 today with score 986/1000. This sim was on the test with AS number 112. R1 was missing network statement, and R4 had different AS configured (22).
One warning, R3 did not have startup-configuration saved in NVRAM. Check all the routers for startup-configurations in nvram and don’t forget to save running->startup.
Alhamdulillah!
Just passed my CCNA 200-120 1000/1000.
Labs were ACL, ACL 2 (Mod 3) and EIGRP without no passive interface or default route configuration to do.
All questions were Easy and nothing new.
bet ya’ll did it…!same here…!
sims…112 eigrp. ACL 1 2..
questions…ALL given!
@salamat di ako naging palaboylaboy at natulog sa Luneta ngayong gabi…!
-BansaniJuan represent!
hi in the ccna exam multiple choice questions came from dumps
Hi All,I just passed my CCNA (986/1000).
Labs were ACL, ACL 2 (Mod 3) and EIGRP.All the other questions from 9tut site.
Practiced all the questions ….THAT’S IT!!!!!
Thank you 9tut admin and forum friends…!!!
I got passed CCNA today with 1000/1000, there are 51 questions 2 drag questions and laps are acl1 &2 mod 3 and eigrp 112,, Thanks 9tuts…