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)
Plnning to take CCNA exam can anyone guide me ????
Hi guys, are the labs in 2012 still ACL2, EIGRP and VTP? Or has Cisco changed them yet?
@9TUT
How often Cisco change the Sims and questions?
During the exam, how to check if the configuration is correct?
Hi guys. On the CCNA exam, is it necessary that all routers can ping the ISP router? I can’t seem to ping the ISP from all the routers except R1. but all the routers(except ISP) can ping each other.
Routing table of ISP:
—————————————————————
Gateway of last resort is not set
198.0.18.0/30 is subnetted, 1 subnets
C 198.0.18.4 is directly connected, Serial0/1/0
—————————————————————
running-config of R1 :
————————————————————–
!
router eigrp 212
network 192.168.36.0
network 192.168.60.0
network 198.0.18.0
network 192.168.77.0
no auto-summary
!
ip classless
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
——————————————————
need your inputs. TIA
i checked the simulation in packet tracer. if i ping from R2 to ISP, it will reach the ISP but will not go back or send a reply, which is true because ISP doesn’t have a route to R2. Is it really necessary that ping will be successful in this scenario? if it is, can someone help me?
TIA
Thanks a million 9tut.
Last 29 Dec,2011, I passed NA with 933.
Sim are ACL,VTP,EIGRP.
In EIGRP, AS 12 , routers are HOME1,HOME2,Field1,Field2.
New added router is Home2.
Home 1 & 2 have fault.After configuration, all connectivity are success but Home 1 & 2 has not updated EIGRP route in routing table even though their adjacencies.That was strange issue.
Anyhow I appreciate 9tut.
@jumo: No one knows that!
moncho answeres the question above for not being able to ping the isp router from the other routers. Read b4 clogging up the posts.
in the exam that i had today, they said that R3 has no connection for ISP. i made all connection between the others routers,but impossible to ping ISP iven from R1. Pls can someone tell me if this is know and how to fix…..the sims are the same. ACL2, EIGRP, VTP.
good luck for all ! I had 801 LOL too shame.
@DPena
Routers R2, R3, R4 may not be able to ping ISP Router because ISP Router does not know the way back to R2, R3 or R4. Either a static route in ISP or configuring eigrp in the ISP router should solve the problem. As about R1 not being able to ping ISP Router, I’m not sure. It’s directly connected, so should be able to ping without any problem.
I’m planning to sit for the exam within a week. Are ACL2, VTP and EIGRP still the most likely simulations?
@ SArmed
What static rouet do we type in? if we type 0.0.0.0 0.0.0.0 198.0.18.6
will that be right or wrong?
@ sarmed
Can we configure the ISP router with the following commands?
conf t
router eigrp 212
network 198.0.18.5
exit
I did this in the lab and they work but is this the right way of doing it???? please reply
In this SIM there you have to add the network 198.0.18.0 in both Routers (R1 and ISP)
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#network 198.0.18.0
ISP(config)#router eigrp 212
ISP(config-router)#network 198.0.18.0
In the exam, I don’t know whether we are allowed to manipulate ISP router. But logically, it’s very unlikely. And I’m not sure either whether we are required to successfully ping the ISP router for exam purposes. I believe if routing information is being propagated between R1, R2, R3 and R4; the simulation purpose is solved and we can move on to the next question.
In real life, the ISP router and R1 would run either a static route or BGP (not in the CCNA curriculum and I don’t know how to configure it..yet).
For practice purposes, the propositions of salman & Charle should work.
edit: please don’t forget to use “no auto-summary” while configuring EIGRP.
@Sarmed . For your question, yes the sims are the same.
I lost time trying make ping work between R1 and ISP. we dont have access in ISP in the real exam.
And dont make my mistake whit Sim ACL2 , i put the acces in the wrong interface…once i realized i started all configurations again but i had no more time (2 min ) result : i forgot one statment!!!!!
Good Luck for all!
@Dpena
So in the exam, you are not required to ping the routers to the ISP? if you can ping all the routers except the ISP, then you have completed the lab. is that so?
Also during the exam, when do you execute “copy run start”? is it after you get out of the console of each router? or after you are sure that your configs are correct? this may sound stupid, but just a caution. :)
@Dpena
Thanks for the information ^_^
Why does 9tut say to ping all the other routers and check AS number from all the other routers when the question already states that ” All other inter connectivity and Internet access for the existing locations of the company are working properly”. The only concern should be between R1 and R3.
@Jimi: I just want to you to double-check the AS number with other routers :)
do we need to change anything or config ISP router?
No dont need to configure the network to see the ISP router. Do it only as it says on the exam. I did it as a practice and setup a
ip-default route to the ISP and pinged it from all the other routers to the ISP and it works.
In the exam the 198.0.18.0 is already advertised on Router 1
to check the AS # just do Show run on all the Routers and it should be in there.
Hi all! I will take the exam on Monday, I am not sure what is dump? but will be appreciated if someone can send that to me at vutrang02@MSN.com. Thank you in advance.
2SAY I HAVE PASSED MY CCNA EXAM AND SCORED WITH 995 MAKS. THANX 9TUT.COM
I passed today with the score 947, all sim labs and most of the questions from here were the same or similar. Thanks a lot 9tut
Can we in EIGRP lab use network command with wild card mask to advertise specific subnet (in theory this works but I am not sure how simulator will grade this on exam).
Example is network 192.168.60.64/28 connected to fa0/1 on R3.
“network 192.168.60.64 0.0.0.15″.
hey all..we dun need to config ISP router as its not asked in question..why is every1 discussing abt it ?
what your simulation for 640-802 ?
Hi All, Is this dump “Cisco.Acme.640-802.v2011-07-09.by.Collisio.486q.vce” still valid? please Refer me latest dump link. thanks
Hi RRR and all,
i am not able to find the dump dima dima 486Q from http://www.examcollection. can you please refer dump link?. Thanks
Passed today. Big thanks 9tut. Most Q’s from Acme dump. Sims EIGRP, VTP, ACL2. EIGRP was a different layout, but same concept- AS number and network #s.
Guys,
How is it that network 192.168.36.0 is not added to the R3? Is this cause R3 already know about 192.168.60.0 and no host are on x.x.36.0 network?
Thx
hey guys i have performed this sim but i could not find the solution for it… i want to write the exam on 23rd jan 2012….the question is that do routers send eigrp updates from its fastethernet interface…???? the link between R1 and R3 in this sim…………
and please tell me which sims will be there in exam..????? nat will be there..???
thanks
one thing more that if we want to connect to ISP then we need NAT configuration , shall we do that/////////////????????????????????
I’ll take the exam tomorrow
Question.
192.168.60.0/30 is subnetted, 2 subnets
C 192.168.60.64 is directly connected, FastEthernet0/1
C 192.168.60.80 is directly connected, FastEthernet1/0
192.168.77.0/30 is subnetted, 1 subnets
C 192.168.77.32 is directly connected, FastEthernet0/0
Looking at this table when adding networks can i just use the:
network 192.168.60.64
network 192.168.60.80
network 192.168.77.32
or i need to add the classful networks? will it create error in the real exam?
@Ezra, you can look at other routers in the topology, if on R2 or R4 in network statement are classless networks with wildcard masks, you do the same on R1 and R3, but if they are classfull everywhere, then u will do the same
@Adi. Thanks :D
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
didn’t work wiith me today in the exam :((((((
hey ahmed? why do u need to put the default network in eigrp ?
the question asks jus to configure eigrp properly
In eigrp is it necessary to ping each and every remote and router after configuring eigrp properly? I heard that their are points for doing this
hi everyone !
I took ccna exam yesterday but failed with 793 marks, most of the questions were from acme(collisio) dumps and labs were EIGRP,ACL2,VTP same as 9tut, but i still failed because i took it easy, badluck :(
neway now i am planning to retake my exam in next month and i wanna ask that do cisco change their exam for retakers ?? can i relly on dumps and 9tut (for labs) again ??
or exam procedure, questions and labs will be new ?? please help
@ ahmed, it’s necessary to enter ip default-network 198.0.18.0 ? what is the latest updates on EIGRP SIM ?
@ ahmed, after you put 0.0.0.0 0.0.0.0 with next hop/exit interace, on R1 do you redistribute default route to other routers with redistribute static ?
Is this sim has been changed?(EIGRP,ACL2,VTP)
Assalam-o-Alaikum
Passed CCNA yesterday 23rd Jan with 986.
Acme Collisio dumps are good and you can use DHARANI too but for new questions but trust Acme Collisio for the old questions because some questions in DHARANI (the old ones) are not right.
Got 48 questions in total 45 MCQs and 3 SIMS (VTP, ACL-2, EIGRP)
in VTP there were some changes but the SIMS were same so if you have learned the sims not crammed no need to worry :)
1. For Q4 the answer was Sw-AC3 because it was the root bridge
2. For Q6 the answer was Sw-Ac3(locally) because it was updated locally
3. For Q7 the answer was C because the revision number on Sw-Ac3 was higher than on SwX
For ACL-2 the requirements were:
1. Permit Host A access to Financial web server(FWS): access-list 100 permit tcp host 192.168.22.1 host 172.22.200.17 eq 80
2. Deny Host A and All other hosts access to FWS services: access-list 100 deny ip any host 172.22.200.17
3. Permit all other hosts access to Public Web Server(PWS): access-list 100 permit ip any any
The ip addresses were almost like the one’s is wrote but I’m not exactly but not the case because they will be changed so just keep in mind the scenario.
For EIGRP.
1. The Main Router was Perimeter.
2. The other Router was Interior.
Just configure the routers like its done here and you will be fine. Just remember to test the connectivity of all the router among themselves no need to worry about ISP router no configuration for that.
Thanks 9tut and ExamCollection and Pass4sure.
Best of luck to you all :)
hi,i,am a completed ccna and i,got a voucher so if reply a some lattest question to reply her my email.idy i, am very happy and got voucher for better performance
my email:syedmohdfaizs0@lgmail.com
thankyou
In the Eigrp simulation test the default is missing ?