CCNA Access List Sim 2
Question
A network associate is adding security to the configuration of the Corp1 router. The user on host C should be able to use a web browser to access financial information from the Finance Web Server. No other hosts from the LAN nor the Core should be able to use a web browser to access this server. Since there are multiple resources for the corporation at this location including other resources on the Finance Web Server, all other traffic should be allowed.
The task is to create and apply a numbered access-list with no more than three statements that will allow ONLY host C web access to the Finance Web Server. No other hosts will have web access to the Finance Web Server. All other traffic is permitted.
Access to the router CLI can be gained by clicking on the appropriate host.
All passwords have been temporarily set to “cisco”.
The Core connection uses an IP address of 198.18.196.65
The computers in the Hosts LAN have been assigned addresses of 192.168.33.1 – 192.168.33.254
Host A 192.168.33.1
Host B 192.168.33.2
Host C 192.168.33.3
Host D 192.168.33.4
The servers in the Server LAN have been assigned addresses of 172.22.242.17 – 172.22.242.30
The Finance Web Server is assigned an IP address of 172.22.242.23.
The Public Web Server is assigned an IP address of 172.22.242.17
Answer and Explanation
(Note: If you are not sure how to use access-list, please check out my access-list tutorial at: http://www.9tut.com/access-list-tutorial, also some modifications about the access-list have been reported so you should read the “Some modifications” section at the end of this question to understand more. You can also download this sim to practice (open with Packet Tracer) here: http://www.9tut.com/download/9tut.com_Access-list_sim2.pkt
Corp1>enable (you may enter “cisco” as it passwords here)
We should create an access-list and apply it to the interface which is connected to the Server LAN because it can filter out traffic from both Sw-2 and Core networks. The Server LAN network has been assigned addresses of 172.22.242.17 – 172.22.242.30 so we can guess the interface connected to them has an IP address of 172.22.242.30 (.30 is the number shown in the figure). Use the “show running-config” command to check which interface has the IP address of 172.22.242.30.
Corp1#show running-config
We learn that interface FastEthernet0/1 is the interface connected to Server LAN network. It is the interface we will apply our access-list (for outbound direction).
Corp1#configure terminal
Our access-list needs to allow host C – 192.168.33.3 to the Finance Web Server 172.22.242.23 via web (port 80)
Corp1(config)#access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
Deny other hosts access to the Finance Web Server via web
Corp1(config)#access-list 100 deny tcp any host 172.22.242.23 eq 80
All other traffic is permitted
Corp1(config)#access-list 100 permit ip any any
Apply this access-list to Fa0/1 interface (outbound direction)
Corp1(config)#interface fa0/1
Corp1(config-if)#ip access-group 100 out
Notice: We have to apply the access-list to Fa0/1 interface (not Fa0/0 interface) so that the access-list can filter traffic coming from both the LAN and the Core networks. If we apply access list to the inbound interface we can only filter traffic from the LAN network.
In the real exam, just click on host C and open its web browser. In the address box type http://172.22.242.23 to check if you are allowed to access Finance Web Server or not. If your configuration is correct then you can access it.
Click on other hosts (A, B and D) and check to make sure you can’t access Finance Web Server from these hosts.
Finally, save the configuration
Corp1(config-if)#end
Corp1#copy running-config startup-config
(This configuration only prevents hosts from accessing Finance Web Server via web but if this server supports other traffic – like FTP, SMTP… then other hosts can access it, too.)
Notice: In the real exam, you might be asked to allow other host (A, B or D) to access the Finance Web Server so please read the requirement carefully.
Some modifications:
Modification 1:
| permit host B from accessing finance server | access-list 100 permit ip host 192.168.33.2 host 172.22.242.23 |
| deny host B from accessing other servers (not the whole network) | access-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15 |
| permit everything else | access-list 100 permit ip any any |
Modification 2:
| Only allow Host C to to access the financial server | access-list 100 permit ip host 192.168.33.3 host 172.22.242.23 |
| Not allow anyone else in any way communicate with the financial server | access-list 100 deny ip any host 172.22.242.23 |
| Allow all other traffic | access-list 100 permit ip any any |
Modification 3:
| - Host C should be able to use a web browser(HTTP)to access the Finance Web Server | access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80 |
| - Other types of access from host C to the Finance Web Server should be blocked - All access from hosts in the Core or local LAN to the Finance Web Server should be blocked |
access-list 100 deny ip any host 172.22.242.23 (because the requirement says we can not use more than 3 statements so we have to use “any” here for the hosts in the Core and hosts in local LAN) |
| - All hosts in the Core and local LAN should be able to access the Public Web Server * | 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” |
Modification 4:
| Host C should be able to use a web browser to access the financial web server | access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80 |
| Other types of access from host C to the finance web server should be blocked | access-list 100 deny ip host 192.168.33.3 host 172.22.242.23 |
| All hosts in the core and on the local LAN should be able to access the Public web server * | access-list 100 permit ip any host (The IP of Public Web Server will surely be given in this question) but in the exam you should use “access-list 100 permit ip any any” |
* There are some reports about the command of “All hosts in the core and on the local LAN should be able to access the Public web server” saying that the correct command should be “access-list 100 permit ip any any”, not “access-list 100 permit ip any host (IP of Public Web Server)”. Although I believe the second command is better but maybe you should use the first command “access-list 100 permit ip any any” instead as some reports said they got 100% when using this command (even if the question gives you the IP address of Public Web Server). It is a bug in this sim.
(Note: Don’t forget to apply this access list to the suitable interface or you will lose points
interface fa0/1
ip access-group 100 out
And in the exam, they may slightly change the requirements, for example host A, host B instead of host C… so make sure you read the requirement carefully and use the access-list correctly)
I created this sim in Packet Tracer v5.2.1 so you can practice with it. You will need new version of Packet Tracer to open it (v5.1+).
Download this sim here
Notice: After typing the commands above, if you make a “ping” from other hosts (PC0, PC1, PC3) then PC4 (Finance Web Server) can still reply because we just filter HTTP traffic, not ICMP traffic. To generate HTTP traffic, select “Web Browser” in the “Desktop” tab of these PCs. When a web browser opens, type the IP address of Finance Web Server and you can see how traffic flows in Simulation Mode.
And notice that in the initial configuration of this sim the Core network can ping Finance Web Server. We have to create an access-list that can filter this traffic too.
Other lab-sims on this site:
Hi, I passed CCNA 200-120 today with 1000/1000. Thanks for 9tut and examcollection.
The lab sim are EIGRP, ACL, ACL2 modification third.
* Host C should be able to use a web browser(HTTP)to access the Finance Web Server Access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
*Other types of access from host C to the Finance Web Server should be blocked
*All access from hosts in the Core or local LAN to the Finance Web Server should be blocked
Access-list 100 deny ip any host 172.22.242.23
*All hosts in the Core and local LAN should be able to access the Public Web Server
Access-list 100 permit ip any
can anyone explain me , is it the same ?
Corp1(config)#access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
Corp1(config)#access-list 100 permit ip host 192.168.33.3 host 172.22.242.23
The first statement will allow host C only to access to the finance webserver through port 80
The second statement will allow the host C to access to other ip services of the finance webserver such ftp, telnet, ping… etc.
Hope this helps
Can any one please tell me how many sim questions in the CCNA exam? and what are the total questions in the exam?
Abdullahi : Thanks for ur explanation.
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Phillip mwale
What is ACL2 modification third ?
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Thank you 9tut ..got 945 marks.
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Passed today. All questions were on the dumps. Had ACL 2 with modification 3 as well.
congrats Bubba. could you give me the latest dumps I am planning to give the exam this month
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Thanks
congratulation Bubba. could you give me the latest dumps!!!
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for those who passed the exam. did you use the permit ip any any? or you use the ip address
of the public web server?
This one was in today exam
I passed CCNA today, a million thanks to 9tut. All the material is here!! lab : acl1,acl2,eigrp . I notice 2 new questions in multiple choice with etherchannel but i didnt remember. my score is 945/1000 . Thanks!!!!
i did not pass my error in acl2 the modification is The user on
host C should not be able to a access financial information with any other way just Finance Web Server how that could be blase i well re exam
Hey Every one Passed my ccna exam today….. Got 989
Labs were ACL,Acl2,EIGRP….
In Acl we just have to use Show Running-config command and select the correct answers for the three questions..
In Acl2 permit host c web access for financial web server and no other host and host c could not access finance web server , and permit every thing else… in the serial interface which connects to the core router had wrong ip address and i changed it
In EIGRP same as hear no passive interaface and default network errors were found..
I used EXAMTUT and Mathew’s dumps and from 9tut…All the questions were from hear and the dumps which i studied
Thank YOU 9TUT AND EXAMTUT AND MAthews
Didnt strained too much …. just relaxed and under stood the topics …. The EXAM is Just a Piece of CAKE if u have under stood the topics….
Cheers Every One …. Alll the best…
Hi Yesterday , I passed my ccna exam with 986 marks. All questions are from 9tut and Watson314.
LAB : ACL1 ACL2 and EIGRP
ACL2:
-Host C should be able to use a web browser(HTTP)to access the Finance Web Server
-Other types of access from host C to the Finance Web Server should be blocked
-All access from hosts in the Core or local LAN to the Finance Web Server should be blocked
and EIGRP with AS no 22.
Good Luck and Wishing you all the best….
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Hi 9tut team
What is ACL2 modification third,Anyone can provide some full example.
Please provide.I take exams 30 May and sent latest dump on anury2007@yahoo.com
Conglaturations for all passed ccna exam
Thanks team
Hi friends….
Alhamdulillah ….
Ive passed CCNA 24-5-2014 :-))
just dont have words to thnx this awsome site.
my lab was EIGRP, ACL1,ACL2.
90%of the questions are from this site and again thnxxxxxxxx a lotssssss
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I will expect to do my ccna exam 30th may 2014 please send new dumps dear ranganab@live.com
Alhamdulillah
Today I have clear 200 120 with 90% marks
There was same ACL lab with little changes.
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Can any one send me the latest dumps 200-120.
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thanks guys…
This was on my exam today.
Modification 3 with host B instead of C. Used “permit ip any any”, 100% good luck
we think the answer on modification 3 is in error;
- there is no need to block c after we have allowed him to access only port 80, he is already denied further access implicit deny all in ACLs! basic rule
- all hosts are the permitted web browser access to PWS so we only give them port 80 access
No other comments required permit all would leave a huge hole in your defences!
thoughts please?
awww omg this shitt really comes just the way its
in my exam , the word “host” wasn’t aceptted >> so i used 0.0.0.0
guys in the real exam can we click on any of the hosts to verify?
as avinash said we need to know ?
please send latest dumps to andrew.mccoy37@gmail.com registered for 6/10 thank you so much
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I will expect to do my ccna 200-101 exam next week please send new dumps dear
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Thnx a lot to 9tut. Just cleared my exam today with 931 marks.
thanx a lot for give this questions……………….
Got 1000/1000 in my CCNA exam on 9th of June.
Labs ACL1, ACL2(third modification) and EIGRP.
Passed my exam today, scored 917, made a few mistakes on a few questions. Labs were eigrp, ACL 1 and 2 with modification 2. This site is very useful. I have some useful dumps(307) questions if anyone is interested.
@ MMASU, Congrats I would appreciate you the dumbs to ekinslarinde@gmail.com. scheduled to take the exam soon. Regards
admin check ur modification 2 command 1 , its not write , CMD should be access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
@correction: The question does not ask to allow only HTTP traffic so we don’t need “eq 80″ part.
@MMASU , Congrats man ! i would be really happy if you can send me the dumps ..And if you can give some more infos about the questions u got in the exam. I will take the exam on 19th june, next week .. Hope you read it soon :)
@ Bodmas, if u already have got the dumbs from MMASU , can you also send them to me ?
Thanks in advance guys.. and Good luck for the other ones!
Forgot to write my mail add :) you can send them to denizas07@gmail.com …
Passed yesterday , scored 986. Labs were eigrp ACL1 and 2 with 2 midification, all questions from 9tut.
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