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)
@tariq
first 2 questions:
http://www.9tut.com/eigrp-routing-protocol-tutorial
the default gateway is the location where packets are sent if the are destined for other networks
n ccna exam command written as it is (configure terminal) or may be written in brief like (conf t) and i can press on tab button to complete??????????????
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!
how did we come to use address 198.0.18.5 ??
^ nvm :P
I took the CCNA Exam today and no luck on my retest. I had about 4 drag drops (Administrative Distance, 2 Routing Schemes, Configuration for the URL). The ACL Sim didn’t want HOST B to connect to Financial Server, deny access to Financial Server for Host B, but all allow other hosts to connect, and the VTP Sim. I thought the Exam was pretty easy. I”m not sure where I made my mistake. I’m not sure if I missed something on my EIGRP or ACL Sims. EIGRP didn’t have Passive-Interface but I didn’t make any changes. I made sure I added the network to both routers and saved the configuration by completing copy running-config startup-config on each router. I didn’t notice the notice the neighbors being adjacent.
hi all, planning to take my 2nd take nextweek, do you have an idea if the alc2 , eigrp, and vtp simm will be in your 2nd try? thanks
PASSING THE EXAM 2MORO, THANX AME, TODD LAMMLE, CBT NUGGETS AND 9TUT
Hi All
In the Exhibit for R1, there is no S0/0: 192.168.36.13, but it is in the 9tut EIGRP Sim.pkt
Does anyone know if Network 192.168.36.0 is included in the “Router Eigrp 212″ exam sim? Thanks
Can any body explain how to configure ip default-network on R1
Masud139@yahoo.com
Ip i onfigure redistribute static instead of ip default-network is there any problem?
how many question on subnneting am i expecting
no….. it’s not command used for that bcz redistribution are used between two different routing protocol…… if you know the protocol to othersite
For example: EIGRP and OSPF
redistribution are used for exchange routes between different routing protocol…..
E.G : EIGRP and OSPF
Doesnt any body have idea how to configure passive interface for R1?and what would b the commands plz
go to config level type a command router eigrp 212
then addvertise a network then no auto-summary enter
then type passive-interface
passive interface command work on router eigrp level
But what could be the command if i configure the interface of s1/0 of R1? Can u plz tell me
i try this one sim me type the command is
on serial1/0
ip ad 198.0.18.6 255.255.255.252
clock rate 500000
no shutdown
And in isp router me gave
serial1/0
ip ad 198.0.18.5 255.255.255.252
no shutdown
and in last use routing protocol eigrp and advertise the network
Why should i advertise eigrp?bcz its a passive interface with isp,
Shouldnt i configure ip default network?
@ Xallax,
wat if in d real exam der Isn’t passive interface configured on d link btw R1 n d ISP, wat sud I do ? ‘M i to configure it or I sud jus leave it? Pls reply.
Just passed my exam today. Thanks 9tut and examcollection.
@ Xallax
Pls help me with ds question.
In which circumstance are multiple copies of d same unicast frame likely to be transmitted in a switched LAN?
A- after broken links are re-established
B- in an improper implementation of. redundant topoloy
C- when upper-layer protocol requires high reliability
D- when a dual ring topology is in use.
Answer chose D, bt I used to think its B. Pls correct me if m wrong.
@hanat
in the real world the ISP wouldn’t process routing updates from your routers, they would have their interfaces properly configured.
B- in an improper implementation of. redundant topology
“redundant” means “there are several ways to get to this place”. if, for instance, STP is incorrectly configured, then you would have the same frame going out multiple trunk link, then going out some more trunk links and it will finally end up at the access ports in 2 or more copies.
@xallax
are u sure that B is the Answer……. but i think i am recommand that D is the Answer…. if you have any reason then tell me
@inamkhanz
https://learningnetwork.cisco.com/message/137215
a ring topology is common, a dual ring topology can exist too without any problems.
if your network devices are improperly configured then problems start to appear.
Hi guys!
Pls is this dumps also valid for those re-taking the exam. Bcos I’d like to re-take next week. And would like to know if that entails a whole new experience.
Anyone with experience here?pls I need info and ideas.
Thanks
thanks a lot lucky for help…
@xallax
Assuming the default Switch Configuration, which Approach Should you use to configure the extended Vlan Range (1006 through 4094) on a cisco catalyst 3750 series switch?
A. Configure the Switch to be in VTP client mode
B. Configure the Switch to be in VTP domain mode
C. Configure the Switch to be in VTP transparent mode
D. Configure the Switch to be in VTP v2
the Answer is “C” in Dumps…….. but i think it’s wrong Answer ….. in my openien the correct answer is “B” ….. what is your openien?
@inamkhan
no sir, the correct answer is C.
A. you can’t modify VLAN database in this mode. wrong
B. this is not a valid mode. server/client/transparent are valid modes
C. only mode that would allow you to modify the VLAN database without influencing the other switches on the network
D. we can configure the extended VLAN range regardless of the version
hi. so i failed ccna twice with score of 805 and dont know what im doing wrong. i have sims down as so i believe i do. i use show commands to verify configurations but must be doing something wrong if i am getting same score on both exams. do i need to add a wildcard mask when i am adding the networks? if any information you could throw my way i will greatly appreciate it. thanks
Thnks Xallax, another question please!
Which command can be used from a PC to verify the connectivity between host that connects through paths?
A – Tracert address
B- Ping address
C- ARP address
D- Traceroute address.
Ans chose A, but I think its D. Pls correct me, thnk u!
chose d just in router , the question ask about pc so the correct chose is A
@hanat
A – Tracert address
this command is used from a host (this is what the question is referring to: a PC) to see the time it takes the packet to get to and from each hop along the path. correct answer
B- Ping address
this command also verifies connectivity, but it tells you nothing about the path the packet went.
C- ARP address
illogical option. ARP stands for “address resolution protocol”. ARP addresses do not exist.
D- Traceroute address.
similar to “tracert”, but this command is used from a router or switch. this is incorrect because the question asks about a command used from a PC.
@ajej
correct sir.
Thnks xallax, I appreciate!
Does anyone know where I can get the latest CCNA dumps. I’m scheduled to take the CCNA in two weeks and need to be ready. Please help me!!!!!!!!!!
http://www.ciscovce.com(THIS IS NOT FREE SITE)
Can any body send me the “ FREE LATTEST DUMPS FOR CCNA ” Please…?
General question regarding eigrp.(Troubleshooting)
To reconfigure eigrp with the correct AS number. Isn’t it proper to be in router config mode to accomplish that.
eg. Router(config)#router eigrp 22
Router(config-router)#no eigrp 22
Router(config-router)#exit
Router(config)#router eigrp 212
Router(config-router)#network………………..
Anyone share some light on this? Thanks.
hi frnds…me and my frnd going tomarrow for my ccna exam….pray for us….and best of luck for all of u…:)
i made it!!!! 881/1000. very very thanx to the 9tut.com. u guys r great. it would b impossible to me to get it through without ur great sims……….also thanx to cbtnuggets n todd lamle……….keep it up 9tut……..
4 the guys who r going to appear 4 exam next—
dont rely upon the dumps just understand all the concepts firs…..
1. ACL was just too hard i mean it was wrong actually…..they had 4 differnt requirements n they made it compulsory 4 us to solve it in no more than 3 lines… so that was impossible… i did loose my pts there..
2. eigrp was same with minor changes. dont need to disable passive interface.
3. vtp was also same with vlan 44 n switch 2 is the root bridge……
best of luck!!!!1
Hi all…my exam next week.. can someone advise me for EIGRP sim pls? do I need to configure default route on R1 to make sure all routers (ISP,R1,2,3,4) can ping each other if there is missing default route on R1 router (that caused R2,3,4 can’t ping to ISP)?
Dear Koffy !
Router(config)#No router eigrp 22(wrong)
Router(config)#router eigrp 212
Router(config-router)#network 192.168.60.0(Given)
Router(config-router)#network 192.168.77.0(Given)
Router(config-router)#no auto-summary
end
Got it? Hope to be
Thanks for explanation Naveed Akhter. But, I don’t think I made my question clear. What I meant was, suppose I assinged the wrong AS number, and I want to reconfigure to delete the wrong AS number and assign the correct AS number. Isn’t it proper to be in router config mode to delete the wrong AS number?
eg. (First deleting wrong AS number)
Router(config)#router eigrp 22……………….wrong AS number
Router(config-router)#no router eigrp 22……………*deleting wrong AS number*
Router(config-router)#exit
Now assigning the correct AS number
Router(config)#router eigrp 212
Router(config-router)#network{network address}
I believe I may have include few steps, but, could it be accomplish this way? Thanks.
A very BIG THANK YOU to God, exam collection, 9tut, xallax n all frds on board, I jus passed my exam today with a passin score of 973. M so api. Good Luck guys!
@Hanat… congrats! you did a good job. And… can share with us is there any new question that you can recall? then how about Sim? Thanks.. coz 21Sept my exam, so..
@ Ashton, thnks! Nottin ws new to me in d exam, most of d questions wer from dis 486 dumps questions downloaded from exam collection, n d labs VTP, EIGRP, n ACL 2 from 9tut. Jus changed d parameters, but same concept. Good luck to u!
@Hanat.. thanks a lot..
@koffy
you can write the command “No router eigrp 22″ in the Global Configuration mode… no need to enter into the router config mode…
like this
Router(Config)#no router eigrp 22 …
hope this clears your point??
but as you’ve written in your question that you can write like
Router(Config-router)#no eigrp 22 this will indicate you an error…
even in the config router mode you have to type
Router(Config-router)#no router eigrp 22…
so why to bother entering in router mode then clear this eigrp process .. just type no router eigrp 22 in the global config mode will provide you the same result :)..
____
Guys, hope am saying right.. please correct me if i am wrong… coz am still preparing for CCNA exam:)…
thanks
Challe,i just pass my exams yesterday.thnx u guys of 9tut.I say God bless u allllllll.