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CCNA Access List Sim

January 5th, 2019 Go to comments

Question

accesslist_sim

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://congressreiki.ranm.org/?all=download/9tut.com_CCNA_Access_List_Sim.zip

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

How can we fix the problem but only allow ping to work while disabling telnet?

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 will happen after issuing the command “ip access-group 114 in” to the fa0/0 interface?

A – Attempts to telnet to the router would fail
B – All traffic from the 10.4.4.0 network would be allow to go through
C – TCP and UDP traffic are not allowed to pass
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 will happen after issuing the command “access-group 115 in” on the s0/0/1 interface?

A – Hosts cannot connect to Router through s0/0/1
B – Telnet and ping would work but routing updates would fail.
C – FTP, FTP-DATA, echo, and HTTP traffic 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!

Comments
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  1. Ali
    November 2nd, 2019

    Is there any one who has given exam currently ? Please tell me about Current labs and simulations

  2. Anon
    November 10th, 2019

    Ali i took the exam on 9 Nov, this particular ACL sim came out, Ripv2 and IPV6 OSPF Sim too

    email me: greyhatnaija @ gmail . com

  3. David70154
    November 15th, 2019

    Hi guys, I took my exam today November 15th, 2019 and passed- 963/1000. This particular sim was in my exam

  4. Begzodbek
    November 16th, 2019

    Hi
    I’m going to have CCNA 200-125 examination.I would be glad if you share with me given in the last questions which were given in the exem.Thank you for your in attention (oa554537@gmail. (com)

  5. {email not allowed}
    November 19th, 2019

    Is there any one who has given exam currently ? Please tell me about Current labs and simulations

  6. Anonymous
    November 19th, 2019

    Is there any one who has given exam currently ? Please tell me about Current labs and simulations
    dj_emilio @ hotmail. com

  7. french from marseille
    November 20th, 2019

    pass 846. this lab was in the exam word by word

  8. Mani
    November 23rd, 2019

    Hi anyone given exam recently plz is it worth to do only these labs?

  9. Yes it came today
    November 24th, 2019

    @Mani , yes it is worth it With little modification on access-lists , try to understand the logic behind , if just experience this lab today

  10. Sham
    November 26th, 2019

    Mani plz do am from a paper now and this lab was there

  11. Naly
    December 1st, 2019

    I did the exam yesterday. Passed with 865. I got this simlet, “CCNA Access List Sim 2″ simulation ,”CCNA Access List Sim” simlet and 7 Drag and Drops. Please practice al the sims and Drag & drops before the exam. other questions also much similar to the dumps.

  12. Esam
    December 2nd, 2019

    @Naly, thanks for the info, so do you recommend for someone to get the sims and drag drops memorized he will pass? and what do you say if someone just practices the dumps? I have studied the material, but I have been failing the exam 2 times because I never relied on dumps and the sim questions came for me were surprising, so I wasn’t able to do much good.

  13. Anonymous
    December 3rd, 2019

    @Esam, NO!!! Not at all… Even though I practice the sims and dumps, I did that with the understanding. So first learn all the concepts behind and then do the questions. Then it will be easy. Don’t just memorize things. It is no point.

  14. Naly
    December 3rd, 2019

    @Esam, NO!!! Not at all… Even though I practice the sims and dumps, I did that with the understanding. So first learn all the concepts behind and then do the questions. Then it will be easy. Don’t just memorize things. It is no point.

  15. Sankara
    December 3rd, 2019

    Whats the password on RouterC of the PKT? I am a premium member but like packet tracer better then the premium member ‘sim’, would be nice to have the password ;)

  16. Sankara
    December 3rd, 2019

    Nvm, its cisco and its stated in the pkt.

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