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)
@Rashmi, i asume u are working with the 9tut sim in paket tracer. U are reaching 198.0.18.5 from R1, no beacouse the default route, just becouse it is directly connected. I meaning, if you go to the ISP router, and go to “show ip route”, i will see nothing, becouse u did not teach him nothing, just directly conected 198.0.18.4….so its imposible to for ISP router to respond pings from R2, R3 or R4. Just anyone correct me if im wrong. Good luck.
any body plz give me link of packet tracer updated version for these simulations??
Hi Friends
Today y pass my examen 945/1000 the labs its eigrp acl2 and vtp the labs chang but its changed a bit but its the same the labs study friends and will feel very happiness when become a CCNA
Thanks 9tut
BYE
Diego R Diego R
you want to say,,we dont need ping isp(198.0.18.5) from R2,R3,R4?
RIGHT?
Erick Vargas ‘ ‘ congratulations u passed the exam today may i ask how many items ? someone told me that the exam has been updated from 50 items to 55 items is that true. . ?
i passed the exam yesterday and passed with 933 points , the sim was ( eigrp , vtp file:/sim/80-ccna-vtp-sim-question.htm ) but with some changes in it …. the eigrp sim there was an additional network in the configuration that they are not wrote it in the requirements so u have to remove it from R1 router nd the rest was the same , the vtp sim they change the interfaces number in each vlan so u have to be sure before u answer …. gd luck :)))
and ACL2 sim too .
@darkcloud13 , i had just 50 questions and they was very easy 50 , hope to u the best :))) … thx 9tut .
@yazan – my two friends failed the exam today due to new questions in the multiple choice. .
what dumps did you study?
. . mine was brar and sekhar dumps,
Its necessary in EIGRP lab to reach ISP from R2,R3,R4????????
@ahmed, for sure u can not reach it in the practice sim by 9tut. Maybe in the examn u can sucefully ping 198.0.18.5, but thats another history, another confiugration must be in the ISP router. I have the examn tomorrow, so im keeping practicing with the sims heres, everthing should be ok. Goood luck to all. Anyone can confirm the available “?” commmand???
@darkcloud http://www.examcollection.com/cisco/Cisco.BrainDump.640-802.v2012-08-27.by.Anonymous.632q.vce.file.html
if there is a passive interface between routers then how do we remove it. plez tell the exact command.
interface fa0/1
no passive interface
i tried this command on packet tracer but it’s not working. plez help my exam is on friday
@akkii
Router(config)#router eigrp 1
Router(config-router)#no passive-interface fastEthernet x
@yazan
thnks..
@akkii u r very welcome , i put the eigrp autonomous system number 1 as an example ,
gd luck with ur exam .
plz some one give me link of packet tracer updated version for these sims
thankz
yazan
in this question,,we use this command or not?
Router(config)#router eigrp 1
Router(config-router)#no passive-interface fastEthernet x
????????????????????????
and when we must use it???
please help me?
@ahmed
No we dnt use it, in this one we use if its was enabled , and u will see it like this if its
enable router eigrp 212
passive-interface FastEthernet0/0
network 192.168.77.0
network 198.0.18.0
network 192.168.69.0
network 192.168.36.0
no auto-summary
in show run command
if the passive-inteface command are enable on f0/0 on R1 or f0/0 on R3 .
and as i said b4 u have to put the eigrp autonomous system number as it required , in this example u put Router(config)#router eigrp 212
Router(config-router)#no passive-interface fastEthernet x ( x is the interface number
thank you man
i understand
you mean if i see (passive-interface FastEthernet0/0) in show run,,i need to remove it by writing(no passive-interface FastEthernet0/0)
@ every body
we need write comman : ip default-network 198.0.18.0
Ip route 0.0.0.0 0.0.0.0 198.0.18.5
is this true ???
pls support me , i have exam on this mounth
@tai
this command will allow ping from other routers to ISP but i think this is not the requirement or is it??? plez update asap….
Hey guys,
I’ve just passed CCNA today with the score 907/1000. The labs were ACL2, EIGRP and VTP. There was only a slight difference from the ones shown here so learn those commands.
The majority of the questions are found on 9tut and on the popular dumps like brar and sekhar.
Good luck getting certified and the most important of all, learn don’t grind.
K33p3r
@ahmed
yes :) …. gd luck .
@ sam
“An extra network to be removed”….there was a network o R1 that was advertised but when i check “sh ip route” it was not there and not connected to anything,,i checked every router but i didn’t find it,,,but it was advertised like all other on R1..
@sam you go:
# router eigrp 212
#no network 192.168.62.0
and continue advertising the network of the new added router
#network 192.168.77.0
#network 192.168.60.0
#no auto-summary
Remember to use all possible commands..eg sh ip int brief, sh run, sh ip route, i believe it add marks as part of verification,
master all the drag and drop and understand their questions eg:when they ask you about source ip,source mac,destination mac and source mac ,understand where the packet comes from(source) and where its going(destination),,dont do vice versa due to cramming of that drag and drop,
Good luck to all,,,don’t cram the sims know the syntax,you’ll never go wrong
@akkii
Tks , i think we no need use that command , beacause in the question they said ” are working properly. “
Guys,
If you want to ping ISP router- ip address 198.0.18.5 from R2,R3,R4 , you should put static route on ISP router ip route 0.0.0.0 0.0.0.0 198.0.18.6. I did this and now I can ping ISP router from R2,R3,R4.
Regards,
guyz can someone send me VCE files…thanx in advance am from Zimbabwe…email marlvinnicol@gmail.com
Hi,
why do we publish the network 192.168.77.0 as if it was /24 bit,
when the network is: 192.168.77.33 / 30 bit ?!
Thanks in advance ! :)
@Helena
The network command by default takes “classful” networks. (WC mask missing form the command, EIGRP assumes “classful” network).
The network statements in EIGRP serve a dual role, both defining which networks this router will distribute, and which interfaces will take part in the routing protocol. So the network 192.168.77.0 command in this example means that if this router has any interfaces that are directly connected to subnets of 192.168.77.0, then it will inject this information into the routing protocol. It also means that it will try to find EIGRP neighbor routers through these same interfaces.
guyz can someone send me VCE files…thanx in advance am from Zimbabwe…email yacoub9308@gmail.com
@ hello all
I still confuse with EIGRP lab , is this necessary use command
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
in the exam ?
beacause as i understand before add router 3 , all configuration are properly –> it mean that we only config EIGRP on R3 and R1
that all !!!
who person was passed ,please explain me ?? i have exam on 16th
thank so much
@tai
no its not necessary , i didnt do it and i get 100% at this question in my exam , u have to check R1 and R3 just
yazan
i am very scared!!!!!!!!!
my exam in 13-11
and i open website(www.howtonetwork.net)
and i see question (the 1st time i see it)
what do you say?
anoher thing:
sekhher and brar + the sim on 9 tut enough…
please help me man…what i can do??
#copy run start
or
#copy running-config startup-config
all these command will save the configuration???????
@ahmad
dnt be scared coz if there is a new question it will be the same as what u studied b4 nthn more nthn less and trust me i was scared b4 my exam but when i saw the 1st question and saw how easy its i felt comfortable .
and i dnt know about that dump , coz my dump was http://www.examcollection.com/cisco/Cisco.BrainDump.640-802.v2012-08-27.by.Anonymous.632q.vce.file.html
and from comments this still valid , see the comments when u open the link .
i hope u will pass , best wishes :)))
@ahmad
and yes coz copy run start its copy running-config startup-config
try to write (# copy run ) and then press tab key then press (start) then the tab key and u will see .
there is another command to save the configuration but its not valid in the exam its for real life ( #wr ) DONT USE IT AT THE EXAM
realy,,thank you man>>
thank you yazan
thaaaaaaaaaaaaaaaaaaaaaaaaaaaaank yooooooooooooou
yazan i am studied the same dump…….
@Yazan
Thank so much ,
@all
u are very welcome guy’s , just plz dnt fail coz its rly easy exam :)
all the dumps are the same,they are just sub-divided differently and may be 2 additional questions
Hi friends, My exam on on the 21st November
Can any one help me with the dumps and simulation with what is similar to the exams please
If you can email me yacoub9308@gmail.com
I would like to thank you so much HELP ME PLEASE!!!
okay yazan
thank you
Guyz can someone help me on eigrp lab. I failed my ccna exam :(
I only got 69% on eigrp lab. However I am very confident that I
configured properly. I can ping all the routers.
Here is the scenerio:
Home1 router, Field1 and Field2 are properly configured.
All other inter connectivity and Internet access for the existing locations of the company are working properly.
Home2 is the new added router. I changed the AS number for the new router and re-configured the network. And I added a missing
network on Home1 router. And one more thing I removed the extra network on Home1 and that extra network is not connecting to anything.
I tested between router to router and all routers are pingable. Note: I used the no-auto summary and copy run start.
Please can anybody explain why I got 69% ? Thanks. .