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CCNA Access List Sim

February 10th, 2014 Go to comments

Question

accesslist_sim

An administrator is trying to ping and telnet from Switch to Router with the results shown below:

Switch>
Switch> ping 10.4.4.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.4.4.3,timeout is 2 seconds:
.U.U.U
Success rate is 0 percent (0/5)
Switch>
Switch> telnet 10.4.4.3
Trying 10.4.4.3 …
% Destination unreachable; gateway or host down
Switch>

Click the console connected to Router and issue the appropriate commands to answer the questions.

Answer and Explanation

Note: If you are not sure about Access-list, please read my Access-list tutorial. You can also download this sim to practice (open with Packet Tracer) here: http://www.9tut.com/download/9tut.com_CCNA_Access_List_Sim.pkt

For this question we only need to use the show running-config command to answer all the questions below

Router>enable
Router#show running-config

accesslist_sim_showrun1

accesslist_sim_showrun2

accesslist_sim_showrun3

Question 1:

Which will fix the issue and allow ONLY ping to work while keeping telnet disabled?

A – Correctly assign an IP address to interface fa0/1
B – Change the ip access-group command on fa0/0 from “in” to “out”
C – Remove access-group 106 in from interface fa0/0 and add access-group 115 in.
D – Remove access-group 102 out from interface s0/0/0 and add access-group 114 in
E – Remove access-group 106 in from interface fa0/0 and add access-group 104 in

 

Answer: E

 

Explanation:

Let’s have a look at the access list 104:

accesslist_sim_answer1

The question does not ask about ftp traffic so we don’t care about the two first lines. The 3rd line denies all telnet traffic and the 4th line allows icmp traffic to be sent (ping). Remember that the access list 104 is applied on the inbound direction so the 5th line “access-list 104 deny icmp any any echo-reply” will not affect our icmp traffic because the “echo-reply” message will be sent over the outbound direction.

Question 2:

What would be the effect of issuing the command ip access-group 114 in to the fa0/0 interface?

A – Attempts to telnet to the router would fail
B – It would allow all traffic from the 10.4.4.0 network
C – IP traffic would be passed through the interface but TCP and UDP traffic would not
D – Routing protocol updates for the 10.4.4.0 network would not be accepted from the fa0/0 interface

 

Answer: B

Explanation:

From the output of access-list 114: access-list 114 permit ip 10.4.4.0 0.0.0.255 any we can easily understand that this access list allows all traffic (ip) from 10.4.4.0/24 network

Question 3:

What would be the effect of issuing the command access-group 115 in on the s0/0/1 interface?

A – No host could connect to Router through s0/0/1
B – Telnet and ping would work but routing updates would fail.
C – FTP, FTP-DATA, echo, and www would work but telnet would fail
D – Only traffic from the 10.4.4.0 network would pass through the interface

 

Answer: A

Explanation:

First let’s see what was configured on interface S0/0/1:

accesslist_sim_answer3

Recall that each interface only accepts one access-list, so when using the command “ip access-group 115 in” on the s0/0/1 interface it will overwrite the initial access-list 102. Therefore any telnet connection will be accepted (so we can eliminate answer C).
B is not correct because if telnet and ping can work then routing updates can, too.
D is not correct because access-list 115 does not mention about 10.4.4.0 network. So the most reasonable answer is A.

But here raise a question…

The wildcard mask of access-list 115, which is 255.255.255.0, means that only host with ip addresses in the form of x.x.x.0 will be accepted. But we all know that x.x.x.0 is likely to be a network address so the answer A: “no host could connect to Router through s0/0/1” seems right…

But what will happen if we don’t use a subnet mask of 255.255.255.0? For example we can use an ip address of 10.45.45.0 255.255.0.0, such a host with that ip address exists and we can connect to the router through that host. Now answer A seems incorrect!

Please comment if you have any idea for this sim!

Other lab-sims on this site:

CCNA NAT SIM Question 1

CCNA NAT SIM Question 2

CCNA Frame Relay Sim

CCNA Configuration SIM Question (RIPv2 SIM)

CCNA VTP SIM

CCNA EIGRP LAB

CCNA Drag and Drop SIM

CCNA Implementation SIM

Comments
Comment pages
1 19 20 21 22 39
  1. Agya
    March 20th, 2015

    The answer to Q3 is not clear. Only one access list per direction (in or out) can be applied to any interface at any time, Fao/o already has one access list (105) applied inbound. So adding a second access list (116) will make no difference to the original configuration with the first access list, unless the new access list will over write the first one, or the commands typed on the console will take precedence over the running configuration!
    Any take on this?

  2. Agya
    March 20th, 2015

    Sorry, I meant Q2. And the second ACL was 114 not 116

  3. 9tut
    March 20th, 2015

    @Agya: Applying the “ip access-group 114 in” to the fa0/0 interface will overwrite the 106 access-list.

  4. Agya
    March 20th, 2015

    Thanks 9tut

  5. Agya
    March 20th, 2015

    But if the second ACL would overwrite the first, why did the answer to question 1 require removing access-group 106 before applying access-group 104?

  6. suhas
    March 24th, 2015

    Hi 9tut,

    im not able to telnet from switchc

  7. Abdul Basit
    March 25th, 2015

    I Passed 24.03.2015, with 917/1000
    thanks u SO much 9tut…
    THIS LAB WAS IN YESTERDAY PAPER.

  8. abody
    March 26th, 2015

    thank you soo much 9tut

  9. liork
    March 26th, 2015

    for Q3 the correct answer is A for sure!
    ACL use wild card insted of subnetmask. N.A 0.0.0.0 + W.C 255.255.255.0 will permit (or deny) only address 0.0.0.X what we all know that is Invalid network address…

  10. Ayah
    March 27th, 2015

    I passed 3-25-15, with 968/1000.
    -ACL, ACL2 mod2 and EIGRP.
    Thanks 9tut!

  11. suhas
    March 27th, 2015

    Hi 9tut,

    let me know for retake exam again we have to pay fees or not .

  12. Mike
    March 27th, 2015

    yes!! every time you have to pay :(

  13. osman
    March 27th, 2015

    are watson + 9tut enough to pass the ccna 200/120 exam ???
    another point about labs would i make the confiuration then answer or they just show me run-config then i will answer ?? i thing it is main point i have to know it so can somebody tells me !!!

  14. Alex
    March 30th, 2015

    Question 1:
    Which will fix the issue and allow ONLY ping to work while keeping telnet disabled?
    B – Change the ip access-group command on fa0/0 from “in” to “out”

    why isn’t this answer good ? can someone explain ?

    If we change current ACL 106 to out instead of in then echo-reply is allowed so ping will work from the switch.
    Telnet will not be allowed because it denied on the outbound from the router.

    i don’t get it why this answer is wrong.

  15. liork
    March 30th, 2015

    @Alex

    Change ACL 106 from in to out will not permit ping from the SW to the route.
    you dont have any rule in ACL 106 that permit icmp (icmp protocol) but only echo-reply that only allow reply for echo-request.

    remember that ACL by default are blacklist – you have a cleanup rule in the and of every ACL that deny any any…

  16. Mike
    March 30th, 2015

    still valid in London?

  17. Alex
    March 31st, 2015

    @liorK

    you right that there is no ICMP allowed but we don’t need it.
    when we change the ACL to be on OUT instead of IN that mean that echo can get inside the router (because there is no ACL on the IN).
    The router sees that the echo message is for him then he sends echo-reply (which is allowed in the ACL OUT) and then the switch receive positive answer.

    I simulated this in the lab and it works great, still have no idea why it isn’t the right answer.

  18. Noha 92
    March 31st, 2015

    Passed CCNA Today with SCORE = 1000/1000
    Thanks to 9tut
    Labs ACL 1 ACL 2 mod 3 EIGRP Sim AS 221

    All Questions from Watson 325Q Dump which is enough to pass the exam.

  19. Mike
    March 31st, 2015

    I passed today with 31/03 986/1000 in London – still valid. The questions 90% from 9tut and some you can find in the other VCE file on the internet. ACL, ACL2 and EIGRP but with different names and IPs for the hosts and others. You can easily pass if you study a few times this questions from 9tut plus a little from books(very important to know about ospf, eigrp, vlans and others). I can help with any tips if somebody wants.

    michael.pat86@ymail.com

    Thanks 9tut and thanks God!!!

  20. veeshu
    April 8th, 2015

    i cleared my ccna on 1st april…..it was dead easy….labs ACL1 ND ACL2 mod3 nd eigrp.. nd all questions from dumps itself.

  21. asoro79
    April 11th, 2015

    Passed the CCNA today April 11, 2015 with a score of 917. The EIGRP labs and the Access List labs are both on the exam.

  22. sanamchowdhury007@gmail.com
    April 12th, 2015

    Hey everyone…I just Passed my CCNA composite exam two days ago. I was scared as hell but once I sat for the exam, everything started to become smooth as water. I was really amazed to see that the question were exactly the same as 9tut. Even the options are same. Not only I PASSED, i GOT 1000/1000. Credit goes to 9tut. Without you guys, it would have been impossible. So those of you who wants to sit for the exam just do this 3 things to prepare.
    1) Finish all the questions available in 9tut.( Dont just do them, understand them and do them
    2) Finish some latest dumps such as Watson
    3) Try to practice all types of lab but certainly practice and learn ACL1, ACL2 and EIGRP.
    If this 3 things are done properly, be sure that you will get 1000/1000. (email me only if you really need more help) Thank you.

  23. oguz
    April 12th, 2015

    I will be taking the exam tomorrow and at question 3
    i discovered in @Abdel-Hameed ‘s lab examples
    if you use show ip interface brief
    you will see that s0/0/1 is shutdown

  24. ahmed
    April 12th, 2015

    passed 1000/1000
    11/4/2015
    watson 314 & 9tut
    labs acl1 + acl2 + EIGRP 23

  25. train2bpro
    April 13th, 2015

    Question 3, Answer A is correct.
    Just add another router to SIM using serial interface and configure it in same network as Router C.
    Enable s0/0/1 interface on Router C. Ping Router C from newly added Router (D) before changing 102 ACL. Ping should be successful. Now apply ACL 115 in on s0/0/1 interface on Router C as directed by question. Ping from new Router (D) to Router C should fail with unreachable (UUUU). that proves Answer A is correct as no host will be able to reach Router C after ACL 115 is applied.

  26. raf
    April 17th, 2015

    passed 917/1000
    17/4/2015
    9tut & pass4sure
    labs acl1 + acl2 + EIGRP 23

  27. Question 3 Answer
    April 20th, 2015

    Question 3 Answer

    Hello everybody,

    I racked my brain and I could understand the question. Based on the current scenario of the question that the interface is down wisely the correct answer is the letter A. But considering the scenario proposed by “train2brpro april 13th, 2015,” where it connects to another router serial 0/0/1 really ping becomes valid only when the connected new Router IP has final “0″. The mask says that any IP address ended with IP 0 because it is a wild card in the truth and the mask is “0.0.0.255″ the same forces that the first three octets of the IP may vary and the last must have to be “0 “. Taking this into consideration the answer “A” would be partially correct, assuming only accept connections IPs addresses ending in “0″ thus rejecting any connection “Host”. I hope it was clear in the explanation.

  28. gilsilva1985
    April 20th, 2015

    Question 3 Answer

    Hello everybody,

    I racked my brain and I could understand the question. Based on the current scenario of the question that the interface is down wisely the correct answer is the letter A. But considering the scenario proposed by “train2brpro april 13th, 2015,” where it connects to another router serial 0/0/1 really ping becomes valid only when the connected new Router IP has final “0″. The mask says that any IP address ended with IP 0 because it is a wild card in the truth and the mask is “0.0.0.255″ the same forces that the first three octets of the IP may vary and the last must have to be “0 “. Taking this into consideration the answer “A” would be partially correct, assuming only accept connections IPs addresses ending in “0″ thus rejecting any connection “Host”. I hope it was clear in the explanation.

  29. col
    April 20th, 2015

    hell 9tut , I really love this site I will soon enroll for the CCNA class I need more dump site to do configuration and more explanation ACL, EIGRP, NAT, AND OSPF

  30. nata
    April 23rd, 2015

    Hi All / 9tut,
    Thank you so the for 9tut given clear information and also helped clear my CCAN exam.
    This I have got this qn in the exam , for this qn no need enter in the router and also no need change the configuration .
    If you go though9tut sight clearly, CCNA exam will become very very easy just like dinking of water.
    All the best ….

  31. ALi
    April 24th, 2015

    hey guys. i want to book my CCNA. I signed up on their site today …person VUE.

    when I wanted to book the test I saw many options…

    is this the right one?

    Exam:
    200-120PT: CCNA Test Bundle + MeasureUp Practice Test (includes 200-120 exam and practice test)
    View Testing Policies
    Price*:
    USD 370.00
    Language:
    English

    Please confirm.. My email is torontoman66@gmail.com. Just tell me f it is the the right one or not.

    Thank you.

  32. John
    April 24th, 2015

    Hello there

    I have the latest dumps to share them with anyone share with me access to the exam simulator software. I paid for the dumps and all i need is someone to share with me the access to the software.

    email me onegoodlife3@gmail.com

  33. Bruce
    April 28th, 2015

    THANKSS HEAPS 9TUT !!! I passed with 950 marks… many questions came from here n some new ones, but there were changes in the simulations though, so having a good understanding of these stuff is important.
    Thanks again.

  34. dodoi
    April 29th, 2015

    i have a question in this sim in the exam does it mean to answer a choices only or there is some modifications i will configure on router

    i am wondering is in the exam this lab question is such choices ?????

  35. EHAB
    April 29th, 2015

    Hi guys

    one question please.. regarding the ACL AND EIGRP packet tracer..
    in the exam do we have to do everything from scratch? or we will have the project ready and all we need to do is to apply ACL AND EIGRP?

    please confirm

  36. Waseem
    April 29th, 2015

    hello everyone.. I have one question I noticed that this lab is multiple choice.. so in the exam will be like this too? same thing for troubleshooting EIGRP

    Please guys clear this as my exam in on May6th…

  37. poyraz
    May 2nd, 2015

    Hello everybody,
    Elhamdulillah (All praise is due to Allah), Allah’a şükürler olsun (Thanks to Allah ) I passed the CCNA exam on the 22/April/2015. I want to provide some advice for the exam. First of all, WATSON, EXAMTUT, 9tut questions are correct. This dumps are valid.

    1- There was total 51 questions. {2 simulations(EIGRP, ACL2 Modification1), 1 simlet (CCNA Access List Sim- ACL1), There was no drog and drop}

    2- There are some small changes in questions. For example, place of answers are different. IP address can be different in simulation questions. AS numbers can be different. Pay attention to them.

    3- There was a new question about Etherchannel.

    Please forgive me for my bad English. I wish you success.

  38. poyraz
    May 2nd, 2015

    and
    Thank you very much 9tut.

  39. Isaias Azeredo
    May 4th, 2015

    Q3: I think there is no correct answer. However, if someone see something different than me, please advise.

    As We can see, the 115 acces-list has a wildcard format error of: “255.255.255.0″. It should be 0.0.0.255.
    Wildcard mask “255.255.255.0″ will permit any ip address with the last octet with “0″: 192.168.1.0 (or) 1.1.1.0 (or) 172.16.33.0, and so on…

    Just remember that ip addresses ending with “0″ are a network addresses (in a /24 network), not a valid ip address ideal for a host.
    In that way, no other ip address will be accepted by the ACL 115 with that wildcard.
    So, the “most” correct answer is “A”: No host could connect to Router through s0/0/1

    The statement “115 in” issued on s0/0/1 will block any host from accessing the router (except the valid ip address ending in “0″, for instance, network mask /20 could have a valid ip address like 192.168.1.0/20 and that ip could be accepted by the ACL 115) –> The diagram does not show what device is connected through s0/0/1. However, if We assume there is a router in the other end of the link, that router would probably have a lot of routes behind him and one of that routes could be a /20 (or anything else with a valid ip address ending in “0″), so, that observation could be valid to say that no answer is correct or “A” is most correct.

  40. phil
    May 5th, 2015

    Hello guys who spent the CCNA 200-120 recently and can tell me what the laboratory has found in the exam?

    Thanks

  41. Phil
    May 5th, 2015

    @poyraz

    Where are : 2 simulations(EIGRP, ACL2 Modification1), 1 simlet (CCNA Access List Sim- ACL1)
    on 9tut because i had already passed the ccna 5 year ago and i had failed due to SIM LAB !

    ??

  42. Felipe
    May 6th, 2015

    Can someone send me watson.pdf please? felipewarms@gmail.com

  43. ahmet
    May 6th, 2015

    Hello Guys,

    I didn’t understand overwrite means in ACL.For question 3 answers said that (Recall that each interface only accepts one access-list, so when using the command “ip access-group 115 in” on the s0/0/1 interface it will overwrite the initial access-list 102. Therefore any telnet connection will be accepted (so we can eliminate answer C).Instead of telnet connection will be accepted, “access-list 102 deny tcp any any eq telnet” Should’t it be deny telnet

    Thanks for your answer

  44. Fatih
    May 7th, 2015

    Hi all,

    I have passed the CCNA exam last week (30/04/2015) with a score of 1000/1000. All the questions were from WATSON dump plus 9tut “New Questions”.

    Labs were ACL, ACL 2 and EIGRP.

    Best Regards.

  45. Aiman Mustafa
    May 7th, 2015

    I passed the Ccna exam on 6/MAY/2015 972/1000 , thaaaaaaaaaaaanks 9tut
    EXAM :
    EIGRP 212 – ACL modification 3 .
    Q1 – Q2 -Q3

  46. Phil
    May 7th, 2015

    @Aiman Mustafa

    Modification 3:
    Any or Host x.x.x.x in the real exam ?

    access-list 100 permit ip any host
    (If the question asks this, surely it has to give you the IP of Public Web Server) but in the exam you should use “access-list 100 permit ip any any”

  47. Han
    May 9th, 2015

    Hi 9tut

    I’ve download practice file however ping is already go through R1 to SW.
    It seems like answer file isn’t it?

  48. NAT
    May 10th, 2015

    Praise the almighty OVERLORD!!!!
    Passed May 9th
    LABS: ACL Simlet, ACL(MOD 1, Host D instead of B), EIGRP AS 112
    3 Drag n Drops

  49. jfheisenger
    May 11th, 2015

    Can somebody please send me the Watson 325Q Dump at fernando.nj@gmail.com ? Im going to be taking the CCNA exam on may 29 for the first time and i really want to pass on the first try!

  50. Ali
    May 13th, 2015

    Hi All,

    Can someone explain Q3? The answer should be “Telnet and ping would work but routing updates would fail” OR “No host could connect to Router through s0/0/1”. I would like to know which one is correct? Please…..

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