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Saturday, April 14, 2007

CCNA Router Simulator Question - VTP SIM

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VTP SIM TESTLET IS ANOTHER SIM EXAM QUESTION

VTP SIM

Question:
This task requires you to use the CLI of Sw-AC3 to answer five multiple-choice questions. This does not require any configuration.
To answer the multiple-choice questions, click on the numbered boxes in the right panel.
There are five multiple-choice questions with this task. Be sure to answer all five questions before leaving this item.

Click on the exhibit for larger picture

Important: The VTP simlet has a pool of 10 question . Test may have only 5 Questions for VTP SIM

some very usefull commands to answer this simlet:

show cdp neighbor , show cdp neighbor detail , show interface trunk or switchport , show mac-address-table, show spanning-tree, show vlan , show vtp status , show run .


The pool of 10 questions are discussed here starting with the 4 questions in the above picture.

Question 1 :

What interface did Sw-AC3 associate with source MAC address 0010.5a0c.ffba ?

Answer:

Fa 0/8 (As per the picture above)

To find out the associate interface number for a given mac address on the switch use the show mac-address-table command and search for the mac address 0010.5a0c.ffba and its associated interface number.

Question 2 :

what ports on Sw-AC3 are operating has trunks (choose two)?

Answer:

Fa 0/9 and Fa 0/12 (As per the picture above)

To find out the ports operating has trunks on a switch

Use the show interface trunk command this will display all the trunk ports configured on switch.

(or)

Use the show interface switchport command and check the output of the command for operational mode : type trunk for each and every interface.

Question 3:

What kind of router is VLAN-R1 ?

Answer:

2611 ( as per picture above)

To know details of directly connected Neighbor, use the following command on the switch show cdp neighbors command, this output gives the following details about its neighbors

Device ID, Local Interface ,Holdtme, Capability, Platform, Port ID

To know what kind of router is VLAN-R1 we need to identify its platform details from above command output.

Question 4:

Which switch is the root bridge for VLAN 1 ?

Answer:

Sw-AC3 (As per the question above in picture)

Step1: Use the Show spanning-tree vlan 1 command this output provide the mac address of the root bridge.

Step2: now use the show mac-address-table command this output associates the mac address to a interface number.

Step3: use the command show cdp neighbors this output will give us the local interface associated with the hostname(Device ID).

Question 5 :

Out of which port on switch Sw-Ac3 would a frame containing an IP packet with destination address that is not on a local LAN be forwarded?

Answer:

To forward any packet with destination address other then the subnet network of the switch, the switch usually forwards this IP packets to the layer 3 device example router connected to it.

Step1: Find the default-gateway(Router or layer 3 device) configured on the switch.

use the Show run command to view the IP address used to configure default-gateway on the switch.

Step2: Look for the router VLAN-R1 after using the show cdp neighbor detail command

Sample output of show cdp neighbor detail command for better understanding the output details

Device ID: C2950-1
Entry address(es):
Platform: Cisco WS-C2950T-24, Capabilities: Switch IGMP
Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/15
Holdtime : 139 sec

Two things to notice from above output

Interface: FastEthernet0/0 this statement provides that the neighbor(c2950-1) is connected to fa 0/0 on the c3660-2 local switch.

Port ID (outgoing port): FastEthernet0/15 this explains that neighbor (c2950-1) uses fa 0/15 port to reach c3660-2 switch.

FOR OUR QUESTION WE SHOULD LOOK FOR THE ROUTER VLAN-R1 corresponding details and to which port it is connected on local switch Sw-Ac3.

Step3: The port number to which the routerVLAN-R1 is connected on switch Sw-Ac3 is used to forward the packets with destination address that is not on a local LAN.

Question 6:

What address should be configured as the default-gateway for the host connected to interface fa 0/4 of SW-Ac3 ?

Answer:

Step1: Find the details of the VLAN assigned to interface fa 0/4 by using the show vlan command on Sw-Ac3.

The above exhibit question has fa 0/4 configured has VLAN1 based on the output from show vlan command.

Step2: From the exhibit question we know that VLAN1 is configured on router using sub-interface fa 0/0.1 with IP address 192.168.1.254 /24.

Step3: 192.168.1.254 should be configure as default-gateway address for the host connected to fa 0/4 on switch.

Because VLAN1 corresponds to fa 0/4 on Sw-Ac3 and host connected to fa 0/4 will be member of vlan1.

Question 7:

Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded ?

Answer:

Step1: Use Show mac-address-table command on the switch.

The output of a show mac-address-table provides the mapping of mac address with port numbers. Search the output for the two mac-addresses provided in the question and select the destination mac address corresponding port number for correct answers.

Step2: If you do not find the above destination mac-address in SHOW MAC-ADDRESS-TABLE output , then the frame will be broadcast or flooded to all ports ( all ports may be ports of particular vlan on switch ,Selection of VLAN will be depending on the source mac-address port vlan membership) except the port it recieved from.

Question 8:

From which switch did Sw-Ac3 receive VLAN information ?

Answer:

Step1: Use Sw-Ac3#show vtp status command .

Sample output of show vtp status command

switch# show vtp status
VTP Version : 2
Configuration Revision : 255
Maximum VLANs supported locally : 1005
Number of existing VLANs : 35
VTP Operating Mode : Server
VTP Domain Name : Lab_Network
VTP Pruning Mode : Enabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0x08 0x7E 0x54 0xE2 0x5A 0x79 0xA9 0x2D
Configuration last modified by 127.0.0.12 at 8-7-02 11:21:43
Local updater ID is 127.0.0.12 on interface EO0/0 (first interface found)

The local updater ID in the above output identifies the ip address of the device which is providing the VLAN information. The address could also be of the switch itself.

Step 2: Show cdp neighbor detail provides the hostname for corresponding to that IP address.

Question 9:

Refer to the exhibit. SwX was taken out of the production network for maintenance. It will be reconnected to the Fa 0/16 port of Sw-Ac3. What happens to the network when it is reconnected and a trunk exists between the two switches?


Answer:

Step1: On switch Sw-Ac3 use show vtp status command. Notice the output for domain name, Both switches must have same domain name configured to exchange vtp messages (exhibit domain name: home-office ).

Step2: If domain name matches, Then note Configuration Revision number of the Sw-Ac3 and compare it with the SwX , Whichever switch has highest configuration revision number will become the vtp updater. The switch which becomes vtp updater will replace other switch vlan information with its own vlan information.

Example if SwX revision number is highest , Then VLAN information that is configured in Sw-Ac3 will be replaced by the VLAN information in the SwX.


{ If you have any doubts or questions please comment here }

58 comments:

ekaja said...

THANK YOU SO MUCH

Anonymous said...

hello,

You said from pool of 10 questions if am not wrong for the simlet. But you have gone through just 9. Any ideas which was the other one?

Anonymous said...

hello,

thank you for this great post.

you are the best :0).

Anonymous said...

hii!! hey thanx a lot 4 all ur answers!! it helped me a lot!!
But i've one qs....answer to qs. no.6 is 192.168.1.254..i agree wd ur explanation also...but in testinside and p4s the answer is different its 192.168.44.254!!!!????

pls help!! wots d rite ans...m planning to give d xam next week!!

thanx in advance!

a3tips said...

Hi,

correct answer (IP address) for Question 6 may depend on the exhibit provided for the question.
For the above exhibit on this SIM the correct answer is 192.168.1.254
You can check the P4s and testinside question exhibit for VLAN1 IP address may be they have provided VLAN 1 IP has 192.168.44.254


Hope this helps

Anonymous said...

Thanks for this, came across this question is Pass4Sure and was getting horribly confused. This certainly helped prepare me for my exam, and I am sure it will help many other people.

Anonymous said...

Thanks to the person who posted all these explanations here. It really helps me when i took my exam last week. Cheers and gd luck to all who are taking soon.

Anonymous said...

thanks dude, your answers made it very clear... :)

Anonymous said...

I just cleared today 29th June with 974. thanks so much for posting these explanations and questions. on the VTP sim, i cud not manage question to do with finding port where a frame moved from source MAC address to destination and finding associated interfaces. i tried sh mac-address-table command but still cud not find the answer. I was however successful on the ACL sim and tests were all good. thanks once more

DJ Ice said...

Very very descriptive.
Nice explanation.

Bry said...

Hi, I have to say this site is absolute gold dust!!! Seriously, I failed the CCNA exam twice (mid 70s scores). Both times I got stuck on this simulator question - everything else i'm fine on. The problem is on the exam you just do not have the time to explore the question fully. Especially the first time you see it (and see it you will). I tried to do a 'mock' version of this question in my simulator but it didnt really help. Then I discovered this site on the eve of my last attempt and studied it all night. I passed yesterday with 860 (849 passmark). Without a doubt it was the extra lift i needed in order to get over the line. Sometimes there just comes a point where all the reading/simulators just cant tell you enough about a particular subject in order to answer questions like these in the time allowed. I can now get on with my life. Thankyou so much.

Anonymous said...

I would just like to ask about the test would give you grade on this 5 random question.. Lest say I only get 4 will I automatically get 0 in this sim..

Im sorry if this sounded like a stupid. But I just wanna make sure..

a3tips said...

Hi,

If you get 4 correct then you will be graded for 4 and not 0.. so dont worry

Cheers!!!

ROBIN said...

in q.4 the answer can be viewed frm the first command itself?
then what is reason 4 giving other two commands?
plz do explain

a3tips said...

Hi Robin,

Q4 options are given in switch hostnames.. for this reason we need to find out the Root bridge mac address corresponding hostname.
thats why setp2 and 3.

Hope this helps
Cheers!!!

Jigar Balani said...

Hey dude,

You did a fantastic job of explaining every thing here. Thanks a lot for helping me clearing my life's one of the biggest hurdles.

I got the ACL and VTP sams simlet with a wrong ip. After struggling for first 30 mins with VTP simlet atlast I was able to solve that.

With the help of this blog, TI and Pass4sure it became easy to pass.

And by the way forgot to tell, I got 974/1000

Thanks a lot buddy
and
keep your good work going.

Next planning for Security+ and ccsp. Any help on that would be welcomed.

Regards,
Jigar H. Balani

Anonymous said...

Having failed CCNA in April with a score of just 730, I passed today with 936.

This site is the reason I was able to do the SIM questions.

I got the ACL and VTP SIMS that are explained here.

Thanks.

Anonymous said...

awesome site. thanks for the explanations. really helped me a lot in clearing my ccna.

the explanations you made in the VTP sims really help me to fully understand VTP itself.

thanks,dude! you are great, just really great!


cheers,
jaguar

Anonymous said...

Thanks a lot for the wonderful blog on CCNA bhai.. I got both your ACL and VTP Sim.. Even though I knew how to do, pre preparation from your site really help me a lot.. I manage to finish my exam in less than 1 hour and scored 936/1000

Thanks a lot.. This site really helps a lot..

Regards
Rahul

Anonymous said...

gr8 work man.keep up the good work.
i passed my ccna exam securing 949/1000.

regards,
rohit

Taha said...

Hi guys,
I just cleared my CCNA Exam and u know what i got 1000/1000. I am feeling great and wants to thank for all the effort u guys are doing on this blog. It's very worthful to have such a great blog.

Also wants to give my regards to the organizer of this blog from my heart.

Regards
M Taha

Anonymous said...

Question 7: Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded ?

This question i not so understand how to get answer from ????

Help.... i plan to sit the exam 2omolo .....

HELP! !!!

a3tips said...

Question 7: Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded ?

Explanation:

The question asks about which port on switch will a frame (Source and destinations MAC address given) will be forwarded to reach the destination.

1. use show mac-address-table command

Search in the output for the desitnation mac address of the frame.

Corresponding Port number for the destination mac address will be used to forward the frame to reach destination.

(or)

2. If you were unable to find the destination mac address of the frame on switch mac-address-table

It will flood(forward) to all ports except the source port of the frame ( considering all ports are on the same VLAN as source switch port vlan).

Hope this helps

Cheers

Anonymous said...

Question 7: Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded

Sorry... i still not understanding for the second part !!....

if unable to find the destination mac address of the frame ?

what command should i use ?

Anonymous said...

Hi,

I will be sitting the exam tomorrow so I really need the answer for Question 5 urgently. I am a bit confused with the output of the show cdp neighbor details command:
Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/15

Which port number is the correct answer?

a3tips said...

Q5:
output of the show cdp neighbor details command:

which port is written for Port ID is the correct answer

for sample output fa 0/15 is correct port.

cheers

a3tips said...

Q7

Second part...
You need not use any command if destination mac is not found.
You need to select an option which says frame forwarded to all ports except the port from where it came on.

Cheers!!!

MMx said...

I passed it a few days ago, 1000/1000 ... I still think that in Q.4 "Step 2: show mac-address-table" is not necessary - in my exam this command didn't show me a Root ID mac at all,better is to use "sh span vlan 1" and looked at Interface Role and Sts:

1) if all 3 are Desg => Ac3 is the root Bridge
2) if 2 are Desg and 1 is Root => we are using the port accosiated to this Root,and then Step 3
3) if one is in Sts BLK => Ac1 is the Root Bridge(p.s. sh cdp neigh won't show such BLK port)

Regards,MMx!

Lonewolf said...

Hi there,

Thank you very much for the information that you've shared.

Me and two of my colleagues just passed our CCNA (640-801) this morning!

All thanks to your clear and concise explanation on the VTP and the ACL simulation.

Cheers,
Lonewolf

blindswitch said...

Hey a3tips.. do you have a site like this for CCNP subjects?

thanks!

a3tips said...

Hi Blindswitch,

Yes I have started one for CCNP with BSCI exam starting..

http://ccnp-bsci.blogspot.com/

I am currently trying to finish CCNA 640-802 this blog then finish the remaining ccnp exams..

Cheers

Primus Pilus said...

I missed passing with an 847

In regard Q7:
“Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded? “
The destination mac was not in mac address table. I found the source mac -address and used show vlan to found the vlan, but the test requested 3 interfaces that the message would be broadcast out. I could only find 1 interface that was in the same vlan as the source mac address, I guessed the other 2 interfaces by not choosing the trunking interfaces? I am not sure if that was correct? Thanks

In regard Q7 “Refer to the exhibit. SwX was taken out of the production network for maintenance. It will be reconnected to the Fa 0/16 port of Sw-Ac3. What happens to the network when it is reconnected and a trunk exists between the two switches?”
On switch Sw-Ac3 use show vtp status command illustrates a higher revision number than Switch X, and set to client, but Switch X is in server mode. What is the correct answer? Thanks

Primus Pilus

a3tips said...

Hi Primus,

For the question
Out of which ports will frame with source mac-address 0015.5A0Cc.A086 and destination mac-address 000A.8A47.0612 be forwarded? “

You were correct still selecting the interface VLAN to which source belongs .The other correct options would have been the trunk ports since they carry all VLAN info which includes the source VLAN also.

For your other question.

Sw-AC3 is in client mode and with higher revision number.
SwitchX which is connected back is in server mode will update the VLAN database of Sw-AC3 with that of SwitchX because sw-AC3 even though it has higher rev number but in client mode a switch can not update its vlan database to others.

Best of luck.. next time around
Cheers!!

Primus Pilus said...

In regard to Q5, you stated fa 0/15 is correct. The description from the show cdp neighbor command for fa 0/15 is that of a switch, not a router ? Thanks


Port ID (outgoing port): FastEthernet0/15 this explains that neighbor (c2950-1) uses fa 0/15 port to reach c3660-2 switch.

Q5:
output of the show cdp neighbor details command:

which port is written for Port ID is the correct answer

for sample output fa 0/15 is correct port.

a3tips said...

Hi,

Thats sample output fot show cdp neighbors... to explain only

In my sample output its a switch but a layer3 switch that has functionality of a router...

Hope this helps

Cheers

Anonymous said...

I just failed my exam. I got in to a panic in the ACL sim after a typo and screwed up.

In the VTP sim I hit the wrong (next) button and skipped to the next question, missing 6 questions in the sim. How many points are the VTP and the ACL sim worth.

In appreciation of all your help

Machers

a3tips said...

Sims have the highest weightage.. its hard to pass a exam if you get both sims wrong.. its like 30% of your exam
Best of luck next time

Cheers!!

Anonymous said...

Hi,

I click on the exhibit for larger picture, but get nothing.

Can upload this pictures again ?

Thanks !

a3tips said...

Re-uploaded the pictures.. chk now

Cheers!!

Stephanie said...

hi a3tips, i'm freaking nervous for my upcoming exam this month! i don't want to pospone taking it coz i might not have enough time than now... please give some advice to overcome this. is there any chance that the exam will be revise this month?

a3tips said...

Hi Stephan,

If you are confident in topics about whats on this blog then you are on correct path to acheive ur CCNA...

Best of Luck be brave and take it early to relive urself from nervousness..

Cheers!!

Stephanie said...

thanks a3tips! i'm studying tonight...i just can't sleep. i want to get this thing! it is burning into my soul man...

berad said...

Question 5 :

Great blog and I want to contribute!

The way question #5 is written wouldn't the answer be fastethernet0/0?

Out of which port on switch Sw-Ac3 would a frame containing an IP packet with destination address that is not on a local LAN be forwarded?

If we are running the show cdp neighbors detail on the Sw-AC3 then the output would indicate that the Interface: fastethernet0/0 would be the local port on Sw-AC3 and the Port ID(outgoing port): FastEthernet0/15 would be on VLAN-R1.
CCNA Study Guide 6th ed Lammle output of the show cdp neighbors command:
Local Interface The port or interface on which you are receiving the CDP packet.
Port ID The neighbor device's port or interface on which the CDP packets are multicast.
If we are running the sh cdp neighb detail on Sw-AC3 then to find the outgoing port on Sw-AC3 that would be the local interface not the (remote) Port ID sending us cdp packets from VLAN-R1.
Maybe you were considering the output as the result of running the show cdp neighbor detail command on VLAN-R1 in which case the switch would be remote and the Port ID would then be the correct answer.

But, according to the diagram we have a console connection to Sw-AC3 and we would most likely be running the commands on the switch so I think that fastethernet0/0 would then be the switch port where packets destined for a remote lan would exit the Sw-AC3.

Taking the test in a few days.

Dan said...

Hi

do you know if this sim comes up in 640-802?

Many thanks in advance

a3tips said...

Hi Dan,

Yes this SIM might also be part of 640-802 exam

Cheers!!

a3tips said...

Hi Dan,

Yes this SIM might also be part of 640-802 exam

Cheers!!

Anonymous said...

Hi ,

Thank you so much for this post..it helped me a lot in the exam...and i cleared lastweek...

cheers.

warren said...

Hey guys, just wrote and passed my CCNA and scored 941 on second sitting. I really wish i found this blog before the first exam. Big thanks to this blog cos it really help me to prepare very well.Thanks a lot u guys.

Mike said...

Hi berad :

I don't see any difference between your comment and a3tips 's answer,if you read this part of his answer:
Two things to notice from above output

Interface: FastEthernet0/0 this statement provides that the neighbor(c2950-1) is connected to fa 0/0 on the c3660-2 local switch.

Port ID (outgoing port): FastEthernet0/15 this explains that neighbor (c2950-1) uses fa 0/15 port to reach c3660-2 switch.

does is make sense?

cheers

Mike

Anonymous said...

Thanks a lot for this very informative and helpful site for CCNA candidates. I just passed CCNA with 965. I got this VTP sim together with EIGRP sim and 3R+1SW topology lab. Keep it up, a3tips! It's people like you and blogsites like this that really defines the essence of what the Internet is all about-sharing information, reaching out a helping hand to others and changing lives. A world of thanks!!!




Darwin from the Philippines

Win said...

Hi a3tips

Just wish to clarify on Q5. It seems like we have 2 different opinion here.

Could I confirm that the solution is fa0/15 is the correct answer?

I thought that fa0/15 = Port on router and
fa0/0 = Port on Switch

If that is the case, shouldn't fa0/0 be the answer (since packet is forwarded out of fa0/0 of switch)

Thanks alot.
Win

a3tips said...

Hi Win,

The Q5 fa 0/15 is only a sample output to get to the answer not based on the above exbihit .. so follow the explanation provided for Q5 to get to the correct answer .

Hope this helps

Cheers!!!

Anonymous said...

In question 4:

you did:
First: show spanning-tree vlan 1
second: show mac-address-table
last: show cdp neighboors detail

Question: would it work in the test if as second steep we use show ip arp command instead?

I ask this because if the the root bridge is itself, the show mac-address-table will not show its own mac address, while in the other hand show ip arp will show its own mac address associated to its IP (IP can be previously pulled from show running config)

so it will go like this

show spanning-tree vlan 1
show run
show ip arp (would this work in the test?

thanks in advance for your help

Alfredo

maguphe said...

When will you update your blog for the new ccna exam? there are two critical questions that is not in this site.

a3tips said...

will try to update the blog very soon mostly next week

cheers

paviarul said...

hi a3tips, i hav a doubt, there was a que in my ccna exam yesterday, "If you want to manage ur switch remotely what should be done?"
I was confused b/w the options "setting telnet password on the switch" or "ip default-gateway". I choose default-gateway option, is this right? Anyways i have passed my exam.Update this que with ans,wil b helpful for others.

a3tips said...

cofiguring switch vty lines with password and allowing logins is important to manage it remotely.

Telnet is used to remotely manage devices that's where your corect option for this Q.

default-gateway is used when you want to reach outside network from switch perspective traffic.

Its not used to reach the switch instead it fwds traffic out to the cofigured gateway

HTH

Anonymous said...

thanks a lot to whoever u are.. :)