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)
@ 9tut I failed last night in ccna because i didn’t know about this site before the exam…well can anybody confirm that should i get the same sim questions next time ? I’m going to attempt again on 10th nov.
HI ALL!!!!
i cleared CCNA today. Got 960/1000. heartly thanx to 9tut and exam collection.com
here’s a suggestion for everyone who’s preparing for it. refer these…
1. your self hard work to understand the concepts.
2. 9tut (V V V V imp.. )
3. examcollection.com
sims were EIGRP, ACL and VTP.
@ Imad dont feel sad buddy. i assure you sims are gonna be same. not in detail. they’ll have same topology but little modification within it. go through each and every word on this website carefully. so that you can understand them well. all the best!!!
i got this question yesterday from the exam… i configure this question very well thnx 9tut.. this site is the best…
wat r all the defects of passive interface
@pratap
i can tell you one: it kills the routing protocol updates (send and receive) on that particular interface. not good if primary link goes bye-bye and you need a back up link up and running fast
HELLO GUYS?
IN CONFIGURING EIGRP INSTEAD OF WRITTING TWO STATEMENTS TO ADVERTISE THE NETWORKS:
#network 192.168.60.0
#network 192.168.77.0
#no auto-summary
WHAT ABOUT THIS ONE:
NETWORK 192.168.0.0 0. 0.0.255.255
NO AUTO
????????
@TOUMANY
EIGRP config dont allow the syntax of using wild card mask.
is this possible to ping r3 to r4?? how??
HI, everybody….for those who completed their exam with VTP,ACL2,EIGRP…how many question did u find in the VTP SIM…all 9 questions or 5 only…thx to reply…
@Jameel:
Please cheick it well,it think wild card works with eigrp.
get into the router,after putting the statement:ROUTER EIGRP XX ? and see.
please correct me if i m mistaking.
@ romix i got 5 questions in VTP sim…
hey all
this dump is still valid becous i pass in 29/10/2011
i don`t know about when this dumps end becous i am not cisco to know that
i talk about questions in my exam i will finished it to valid send to every body want it becous i remember that questions in my exam like ( vtp . eigrp , acl 2 ) in 9tut
but some of ips different . i mean that no about dumps
i am sorry to all understanding me wrong
allah with every body and isa will help him to pass his exam
am sorry again
This sim is still valid (also had the ACL2 and VTP sims). Passed with a 973 today, even though I saw about 10 new questions I’ve not seen before in the latest dumps. It still pays off to know the stuff underneath the information on this and other sites.
this link about questions ved(53Q)and my exam(53Q)
http://www.4shared.com/file/pYxh4j4q/CCNA_EXAM_QUES.html@ved
http://www.4shared.com/file/VaoFQjEn/ccna_exam.html@moharrem
Pass my ccna exams 2day! score 858. colisio dums still valid. sim were acl eigrp and vtp. sam like 5 new qsts
9tut,
Thanks these helpful information here. My question is after
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
Do we need write configure “redistribute static”? Could you plese reply my this question to my email:lpng_m@hotmail.com?
Many thanks!
Hello !
Today i took my ccna test and i kinda failed it 749 was my score but somethin wierd happened to me during the exam with a question very similar to this question
i typed in the configurations i was pretty sure somthin was missing so i wanted to check to check out if i was wrong or not so i pinged the R1 (or what was similar to it in the exam) interface to check and the ping didnt echo back
anyhow i wanted to remove the config i added and type the part that was missing but the test program got pugged i am not sure that is my question
i was able to console the other routers fine but the router i did the config/pinged on was stuck on the ping response giving me nathing to type or do anything
was that a bug in the program or somthin or that is just how it works ? cuz i basically asked in the center . administrator said he cant help me and i had to move on with the test but ofc i lost the degree of this question ( and some after it due to my haste to compensate for the lost time )
respond and advice plz on what i should do
please tell me why we not sent packet from router3,2,and4 to isp please tell me
@ rashid satter
Yes, you can send packet from router 2…3…4 to the ISP, once you configure IP ROUTE on R1 s1/0 interface,(IP Default network 198.0.18.0…..IP Route 0.0.0.0 0.0.0.0 198.0.18.5) which will be advertise by R1 to R2, R3, and R4., asking R2,R3,R4 to send any packet which does not reference in their routing table to the default route(static route). Normally these are packets destined for the internet. Thanks.
I’m so exciting cause i’ll take the exam at 30/NOV/2011,I hope will pass the exam… ;);)
Thank you everyone for the shared ideas.
@Des
#wr mem = #copy running-config startup-config
Use longhand to be sure in actual test
@toumany @jameel
EIGRP ALLOWS the usage of wildcards.
packet tracer test:
added 1 router
configured its interfaces:
interface fa0/0
no sh
ip add 10.0.0.1 _ 255.255.255.0
interface fa0/1
no sh
ip add 10.0.1.1 _ 255.255.255.0
went to router configuration mode:
router eigrp 1
network 10.0.0.0 _ 0.0.1.255
verified the advertised networks:
do sh ip proto
[..]Routing for Networks: 10.0.0.0/23 [..]
@Xallas:
Thanks,
I do agree with you,wild card mask can be used to configure EIGRP.
Hello guys. will take the exam on 11/11/11. My original date date was postponed by the centre due to network problems. Any changes guys???
past test today. thanks to 9tut and dumps. There where lots of new questions I had not seen in any dumps had ACL2 EIGRP and VTP labs. VTP was tricky because the router AC3 was set as server so it had updated its own vtp.
I took my CCNa exam today and failed, I know I screwed up in SIMs..did anyone had the following EIGRP question ? if yes, is there anything needed extra except configuring EIFRP (i.e. configure main router with ISP) or cisco is just confusing with keyword “ISP” ? Please advise.
CCNA.COM has a small network that is using EIGRP and its IGP, All routers should be running an EIGRP AS number of 112. Router Campus is also running static routing to the ISP.
CCNA.COM has recently adding the Main router. Currently Main router does not have connectivity to the ISP router to ISP router. All other interconnectivity 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(s) to provide full connectivity between the router.
give me detail info about the redistribution of ospf an eigrp ???????????
@Ron
yeah, i screwed that one up too. after you change the router’s AS number to match the other routers, you then have to go to the main router (the one that connects all 3 routers together) to add the network address of the router whos AS number you just changed.
hope that helps.
@Des
bt wen u change the AS values on routers u add the network address anyway in one go like stated above in sims… so i dnt understand that y do u have to go back to the main router to add network address after the AS has been changed.
for e.g. router eigrp 112
network 192.168.77.0 or so on
OR
no router iegrp 22
router eigrp 112
network 192.168.60.0
network 192.168.77.0 so on depends wat ip addresses they give
no auto-summary
this is how the config is done bt i dnt understand ur comment above plz dnt mind i just want to be clear.
@RON
u said that u had this in ur eigrp sim “Router Campus is also running static routing to the ISP” anyone plzz…..does that mean we have to config static routing on isp or on any other routers or we just leave it as it is, like “passive interface” btw isp main router in previous eigrp sim, coz they have modified the eigrp sim…
anyone can help here plzzz ….
someone pliz send me the latest dumps of CCNA to ecky2010@live.com.. im planing to take the exam late next week.. ill be happy.
Hello all,
Could someone please send me the latest dumps at meeshoo80@yahoo.com.
Thank you in advance.
PASSED EXAM TODAY
@christina
First, do a sh. run. on main router to be certain all the router are form and exchanging update. If for some reason, one of the router is not form, then do a sh. run on that router. Possibly a different AS number might be the cause. You then go through the process of changing the AS number, and then advertise the network. At this point you have only solve half of the problem.
Secondly. go to the main router and include the router’s network in the statement of the main router. Remember to do the “no auto-summary”. You can do a “ping” from the router to the main router just to be sure and to be safe.
If needed you also do the “no passive-interface OR passive-interface, depending on what is required.
I hope this help to somewhat. Thanks.
@VTP is not fair you have to advise us !!!
After I changed the AS, i’m having a problem indicating the network under router eigrp
it is said there:
network 192.168.60.0
network 192.168.77.0
How do you get those networks? What is the subnet mask?
This is my calculation
network Address for R1 and R2 = 192.168.36.12/30
R1 s0/0 = 192.168.36.13
R2 s0/0 = 192.168.36.14
network Address for R1 and R4 = 192.168.60.24/30
R1 s0/1 = 192.168.60.25
R4 s0/1 = 192.168.60.26
network address for R1 and R3 = 192.168.77.35/30
R1 fa0/0 = 192.168.77.33
R3 fa0/0 = 192.168.77.34
I was wondering why 192.168.77.0 and 192.168.60.0?????? Can it be 192.168.77.35 and 192.168.60.24?
@NEEDLE
Lets analyze it step by step.
Step 1.
From the Sh. run on Router3. We notice R3 has wrong AS value. We need to change the value.
R3>enable
R3#config t
R3(config)#no router eigrp 22
R3(config)#router eigrp 212
Step 2.
Advertise R3 network.
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 run start
Step 3.
Include R3 network in R1 network statement.
R1>enable
R1#config t
R1(config)#router eigrp 212
R1(config-router)#network 192.168.77.0
R1(config-router)#no auto-summary
R1(config-router)#end
R1#copy run start
From your statement, I think you are confusing network addresses and interface addresses.
Network addresses is what you advertise to the neighboring routers, eg. R3 to R1 OR R3 to R1 OR R4 to R1.
Interface addresses are, eg Fa0/1, Fa0/1, Se0/0 so on and so on.
When you are configuring your interface, you use the mask, depending on your subnet mask and how is broken down. Eg /28 is broken down into addition of 16…./30 is addition of 4…..
R3 fa0/0 192.168.77.34 255.255.255.252……/30
R3 fa0/1 192.168.60.65 255.255.255.240……/28
R3 fa1/0 192.168.60.81 255.255.255.240……/28
Make sure your interfaces are “ON” with the “no shutdown” command.
I hope this helps you figure out network addresses and interface addresses. Thanks.
Hi Koffy!
So I’m configuring interface addresses?
I know the steps, that we need to change the AS in R3, then add 192.168.60.0 and 192.168.77.0 then go back to R1 advertise R3, add 192.168.77.0
But I’m asking why the networks to be advertise are: 192.168.60.0, 192.168.77.0? all /24? is it indicated in the problem or in the sim? Why it can’t be the network address 192.168.77.34 and 192.168.60.65?
Usually in our lab, it is already indicated the network to be advertise. So, i’m confuse… 192.168.77.34 and 192.168.60.65 are network adddresses as well, why 192.168.60.0 and 192.168.77.0?
please guys update us ? tall us more about question is it the same to 9tut.com and simulation ?
@NEEDLE
Let say, you are offered a block of address 192.168.60.0/24, and you have 3 other hosts within your network. it is your now your duty to subnet this block of /24 within your networt (subnetwork). This where subnetting skills comes in play.
For instance R3 has /24 and wanted to subnet to fa0/0 and fa1/0
fa0/0 192.168.60.65 255.255.255.240/28……..this is from 64 to 80 increment of 16(sub-zero enable) .79 is the broadcast address.
fa1/0 192.168.60.81 255.255.255.240/28…….this is from 80 to 96 increment of 16(sub-zero is enable) .95 is the broadcast address.
So basically, a block of address is the network address, and is broken down or subnetted in the most efficient manner for address conservation.
In otherwords, 192.168.60.65/28 and 192.168.60.81/28 are addresses that belongs to network 192.168.60.0/24(subnetted). And 192.168.77.34/30 belongs to 192.169.77.0/24(subnetted).
Remember that fa0/0 on R3 and fa0/0 on R1 must share this same address space (serial link) /30
For a better understanding, you must first grasp the concept.
Hi Koffy
Ok… yes.. 192.168.77.34 and 192.168.60.65 are subnetted of 192.168.60.0 and 192.168.77.0.
So in the exam will CISCO indicate the 192.168.60.0 and 192.168.77.0 or at least the subnet like /24? Because in this sim it does not indicate the subnet. The only given is the subnetted parts.
@NEEDLE
Actually, the above sim indicates the subnets.
The above sim is similar and identical to Cisco exams. The sh. run command on the main router and the individual routers displays all networks and interface addresses. You should be able to differentiate the network addresses from the interfaces addresses.
Eg. 192.168 60.0………../24 Network address.
192.168.60.65 255.255.255.240…………../28 Interface address.
this site is extremely helpful to pass the CCNA exam. Thank you guys for all the sims and questions on this site. just go through all the sims and the 665q dumbs.. study the sims and concept mainly.. you learn a lot from these questions and thus you can handle almost any ccna question from the enhanced knowledge you get through these dumbs and sims. my advice is to use these material positively to enhance your knowledge and thus help yourself to pass CCNA. GOD bless!!
@koffy
thanks alot for ur help…..there is no auto-summary on R1 in pink sims above so i assumed u dnt use no auto-summary on R1 only used on R3. thats where i was gng wrong.
at my understanding no auto-summary is required at both R1 n R3.
thanks once again koffy
@9tut
i can’t ping the ISP router from any router except from R1
and i try to this static commands in R1 but there no reply
@sherif
coz. ISP router not have routing.
just FYI the router 212 change to 222
someone name Rohanat has just explained, he has done the exam today….
source http://www.9tut.com/share-your-experience/comment-page-155#comment-152868
can someone confirm if “?” can be use during the exam?
how about “tab” and show commands, will it deduct a point if used?
thanks to all who have shared their experience, it is helping us all newbies…. :)
@ kanit
so i have to make eigrp 212 on ISP router to have successful ping from any router
I passed my exam on 15th of Nov. Thanks 9tut very much.A