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)
newly added router R3 can not communicate with the ISP router .. How to Configure it ..?
@syed
does R3 have an entry in the routing table that would get traffic to the ISP router?
is there an entry in the routing table of the ISP router that would allow echo-reply to get back to R3?
I took above lab, i want to ping ISP by R3 or any other new router added but could not so what should i do ..
Should i use static route on ISP as no eigrp configured there on ISP
ip route 192.168.0.0 255.255.0.0 198.0.18.6
or Configure EIGRP on ISP..
ISP(config)#router eigrp 212
ISP(config-router)#network 198.0.18.0
@syed
just a static route as the ISP router shouldnt participate in the AS
@Thanx xallax
And one last qs in exam do we have to use pc to configure these thing or directly in router ?
and what command should we write on R1 so all the router connected to R3 can ping ISP as i donot want to configure on ISP …?
Could be this .. but not working
ip route 0.0.0.0 0.0.0.0 198.0.18.5
router eigrp 212
redistribute static
Sorry
what command should we write on R1 so all the router connected to R1 can ping ISP as i donot want to configure on ISP …?
@syed
if ISP doesnt know where to send back the answer then you’re default route is useless.
you still have to configure it for your lab to work :)
and to answer your other question: “Access to the router CLI can be gained by clicking on the appropriate host”.
cheers
please help me with eigrp,
what are the commands used in r1 to communicate with isp
do u have to ping the isp router ?
if yes, then how can we ping isp router from all other routers.
please help me,
Hi,
Can u guide…about the modified question of Lab VTP’s Questinon no-9
If one of the host connected to Sw-AC3 wants to send something for the ip 190.0.2.5 (or any ip that is not on the same subnet) which switch will be the destination ?
Passed my CCNA Exam today with 973 thanks to God Almighty, Todd lammle for the tutorials, 9tut for the advice and sims, and myself for studying to understand. the labs were Eigrp,Acl and Vtp. the ACL was d same with the ones on 9tut with diff IPs, the eigrp was very similar and the Vtp were the same with different revision nos though. Goodluck to every one writing the CCNA. stick to 9tut for the labs, get a recent dump and get a good book like todd lammle’s to understand .
when i did d Eigrp lab in my Exam, i got d adjacency up and my R1 could communicate with other routers in the network but i couldn’t ping d ISP from R1 still. i think we need to use NAT for that because d addresses are private addresses. but i still passed the Eigrp lab and my CCNA with 973 , i’m guessn R1 doesn’t need to access ISP for the Exam. so just make sure the routers on your network can reach one another.
@ Lawal
I had the same i just pinged the R1 interface and called it a day…think i got pretty good marks on it though passed with 920/1000 and like 92% for the config routing, 100% for ACL and NAT though and I didn’t configure nat on there i just left it so you would have thought would get marked down on that if Nat was the answer but you could be right i think the next person that goes in if they are making good time should try the nat overload on the interface and see what happens…if its not that it probable will have the nat commands disabled in the software anyway.
Passed the exam today. 973/1000. VTP, EIGRP and ACL. Thanks for the tutorials here. Thanks 9tuts.
Hi
Passed today with 960/1000 ….same EIGRP quetions…with IP addresses and ASN change.
Thanks 9tut.
Passed today with 900/1000…new questions on IPV6 and wireless. Sims were EIGRP, VTP and ACL.
All the best to those who are preparing for exams.
Thanks 9tut.
I’m confused, but as far as the EIGRP sim on the exam, do you have to do anything regarding “passive interfaces”, and if so, how do you do it? Also, above it says that in the EIGRP lab, that on R1 you’ll see the
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
statements but on the Packet Tracer “answer” file, they are not in the running-config on R1. Do you have to do this on the test as well? Please advise, thanks.
Got my CCNA today. this is 1 of the lab questions.
Thank you 9tut.com!
@9tut
How do I access the CLI of R3 in real exam? Do I have to use one of the hosts (A, B etc) or double-click the Router itself to access the CLI?
Thank you
@TerryC
Iam failing to log in to the web site you have provided
help needed.. how to check for thee one extra network and remove it?? is it necessary to remove it or juz leave it..
@CCNA Student
NO login is required, just go here http://dl.dropbox.com/u/72308819/CCNA-Exam.zip
Once you are in the website, the file will automatically download by itself
first THANKX to ALLAH
and 9tut ,tery matt
and all of u
that i have passed my ccna exam with 947
same labs
,can any 1 help me abaout ccnp or ccip ???
plz write
asim_shah@hotmail.com
I’m impressed, I have to say. Really aerrly do I encounter a blog that’s both educative and entertaining, and let me tell you, you’ve hit the nail on the head. Your thought is outstanding; the issue is something that not enough persons are talking intelligently about. I’m very happy that I stumbled throughout this in my seek for something relating to this.
Conversation overheard 10 or so years ago in Radio Shack == Radio Shack kitcee to prospective customer: This computer has the new 3.5 inch floppy. This is a DSHD disk drive. Now the special thing about this kind of diskette is that it can write data on both sides of the data surface etc etc The patron seemed VERY impressed.
@TerryC
@Xallax
@9tut
Can anyone please explain details with full commands for passive interface check and delete from R1 and topics about ip default network for EIGRP SIM?
please explain asap…….
@jon
what is there to explain? those are the easiest eigrp configuration commands.
on the spoke router just remove the current eigrp routing instance (no router 22)
add a new one for the correct AS (router eigrp 212)
advertise the appropriate networks (network aaa.bbb.ccc.ddd)
dont let the router summarize the networks to avoid any problems with discontiguous networks (no auto-summary)
save the running-config.
on the hub router just advertise the missing network
should save running-config here too
tada! that’s it :)
@Xallax
Thanks for reply. My question was for Modification part in tut for EIGRP.
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 R3, 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 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 the correct answers.
(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
!
** What is passive interface, How do delete or define ? What about ip default-network?
Pls explain for modification part only.
@jon
passive-interface: on this interface there wont be any eigrp advertisements. it just turns off eigrp on that interface.
ip default-network: the network where all unknown traffic should be sent.
Just took the exam and failed. i couldnt get one sim right!! sim were EIGRP, VTP … all in 9 tut. will try next week .thanks to 9 tut
ALHAMDULILLAH passed 2 hours ago with 907/1000, passing marks was 825, VTP Sim, ACL-2, EIGRP (AS 23) came in my exam and almost same with different IP scheme, thanx 9tut……. Good Luck guys!!!
Now looking towards CCNP or CCNA Security =)
@xallax
You say on the EIGRP lab delete the wrong AS network, rename it to the correct one, and put the aaa,bbb,ccc,ddd networks back in. When I had the lab on the test, I renamed it to the correct AS number after deleting the wrong one, and added the 2 networks that were in the original statement that had the wrong AS number. Was I supposed to add more than the 2 networks? You also stated to add the missing network on the number 1 router in which I did as well.
@anonymous
so what went wrong if you did all that right?
please can someone help me with an explanation on why isn’t the ping from R3 to to ISP successful ? even after i configured a default and ip default-network?? please i need an explanation asap. thanks
Thanks to God, I have passed my CCNA today with 960 marks. There were 48 questions with two labs:
1. EIGRP with some modifications(I have to make connectivity with ISP router), and there is “passive interface” command on router’s ISP side so I didn’t change that.
2. Access list same just change with IP’s.
I want to thank 9tut because I prepared all my labs and questions from here, just reviewed 480 dumps last two days and specially thanks to xallax comments about different questions as that were very helpful.
Good luck to all
I just took the Exam today! Y passed with 905/1000!!!.
Thanks a lot 9tut.com. The best place to study the Simlets. I couldn’t have done it without you.
The 3 sims were: VTP, ALC2 and EIGRP.
- The addressing scheme on the VTP SIM was different, and things were quite different. My 5 questions were: Question 1 (different MAC addresses); Question 9 (There was no ip default-gateway on the show runn, but I managed to get the answer); Question 4 (Sw-Ac3 was the root bridge switch); Question 5 (the port was assigned to vlan 22); Question 7 (Sw-Ac3 had a higher configuration revision number than the new one, so it prevailed)
- ACL2 had different network addresses and the statements of the ACL were: 1)Allow only host D to use www to access Finance Web Server. 2) Deny any other hosts to access the Finance Web Server. 3) Allow everyone to access the Public Web Server.
- EIGRP used AS 221 and had different network addresses. The routers were called Regional1 (R1), Regional2 (R3), Store1 (R2) and Store2 (R4). The router Regional2 (R3) had misconfigured AS 22. There was no passive-interface command anywhere on Regional1 (R1).
Thanks again!
Now I will embark on CCNP (or maybe CCNA Security).
Pass my exam today. Got 1000/1000….a 100% pass i couldn’t believe it after having failed 2 weeks ago with a score of 815. Had the same ACl, VTP and EIGRP sim like last time with just little change. Almost all question that appear in the exam are found here except for 4 or 5 new question>>>
for those who will attempt the exam soon beware as there are similar questions as in here that has some configuration change so don’t just jump in BE CAREFUL. also curiously my first question was the eigrp lab and all the 2 other sim in b/t ques 2 to 10. think they just try to scare me away. Anyway 9tut you are the best.
Should anyone in here need help don’t hesitate
passed CCNA. 960/1000. EIGRP, VTP, ACL-2.
I took my CCNA exam today. I passes with 881/1000 score. Thanks 9tut and exam collection dump. This eigrp question was in the exam with some slight change (different router name topology but the same objective), There was also a slight change in the VTP and Access list questions. I’m glad I passed lol
hi friends,,
how can i view the passive interface on the router pls any one help me ,i am going to take exam next thursday pls
Alhamthulillah.. By d grace of Almighty Allah I have passed CCNA today with 933/1000.
Collisio and jericho dumps are 100% valid.
labs were:
ACL2( ip address change, everything else same as in 9tut)
EIGRP( change in only ip address. dont touch d mysterious network in router 1)
VTP ( sw3 is d root bridge, everything else is d same).
thnks 9tut & examcollection.. next onto CCNA security..
Pass CCNA today, 894/1000 Thanks to 9tut for all the good stuff on the site!!!!
Labs: Acl2, VTP, Eigrp(got 85%, I don’t know why? I remove the mysterious network route)
Passed my test with a 947 the other day, after failin the first time with an 815…… had I known about 9tut prior, I would have saved me some money and stress…..anyway, 9tut is a great reference point for those who have studied…….Labs were EIGRP, VTP, and ACL2……..Jericho and Collisio dumps are right on!!! Good luck to all
any one tell me how to blocked PC 1 in One server and same PC access to another Server.
ACL.
I passed CCNA today with 920/1000 … Acme-486Q still valid, only 4-5 questions are new in the exam. Labs are EIGRP, ACL, VTP same as in 9tut, just minor IP variations. Thank you 9tut and good lukc to all of you for the exam. :)
Hello @ paul and skull do you guys know which dumps are valid for this test. If so which dumps did you study from. Thanks email me the info at hotneeraj007@gmail.com, is the passing rate still same as 850. Let me know please. you said acme 486 is that jericho version or colliso?
is necessary that the ISP has connectivity with all the net ?
what is d use of “No auto-summary” command here ?
is it important ?
@hulk
yes, it is important
192.168.60.0 has been subnetted. the default behavior for eigrp is to advertise the classful network (same as RIPv2).
Thanks God… Passed CCNA test today with score 933/1000.
It’s all 48 questions with The labsim are ACL, VTP & EIGRP (with passive interface on Serial Interface to Internet/ISP).
Learning ICND1 & ICND2, and offcourse learning all tutorials & labsims from this great 9tut.com site. So many thanks.
hi guys i do like know that do we have to do any configurations during exam