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:
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Thanks
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Can someone please explain to me what the modifications mean? My idea is that if the questions are asked in a different way then just add the extra commands given to me on the right side. Do I add the extra commands or change the commands and replace it with those? Because on my practice simulation i add in the basic commands and it got me a score. but when added the modifications it lowered my score.
Cleared 1000….yeeeeeeeeeeee
ACL 1
ACL 2 with modification 4
EiGRP with no eigrp and advertise new router on main
Watson
Gillbeast
9tut
GOODLUCK
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Passed CCNA with 927/100 marks today on 16/6/2014
simulations are ACL, ACL 2 & EIGRP
both acl s are same as it is. eigrp with different AS 221
used examtut, 9tut (simulations) & N.S 32q ( for syslog & netflow) dumps.
passed CCNA today with 945
kindly send me any dumps i can use to review..ill be taking my ccna exam soon. markiemark.delavega@gmail.com
guys today i have complete my ccna examination with 972 marks …
hey guys please update me on which modification you got on the CCNA
Hey Guys.. Took the test at 10:00 on 18.06.2014 .. 903/1000 :))))
Thanks to 9.tut …
Labs were ACL 1 & 2 ( exactly same as on 9.tut ) , and EIGRP ( again exactly same but with 112 proess ID )
There were just some questions about NetFlow ( Again , exactly like on 9.tut)
Good luck for the ones who will take the test soon !
Cleared today with 950 Score, Labs were ACL1, ACL2 (Mod 3), EIGRP (this had 1 passive interface applied on int going to ISP), IPs were different.
Dumps Matthew, Watson, Examtut, MORE than enough… Best Wishes for all
@ MMASU, dear…first of all congrats… i’m going to take my CCNA exam at the end of this month….A little bit of anxious…as you know….this is my mail address (msilsa26112@gmail.com)….it will be a great help for me if i get any help from you…..:)
cleared CCNA with the score of 1000/1000, it was so easy
anyone need dumps or other helping material email me at elegance_96@live.co.uk
Please share the dumps with me as well because I am going to take the exam within this week “In shaa Allah”
Nasratullah.wahidi@gmail.com
Passed today with 1000 Thanks for all help i got from this great website
i got acl1, acl2 modification 4 and eigrp simulations,
Note that you should put in acl2 at the end permit ip any any cos there is implicit deny at the end and we should permit connections for this we put permit ip any any not just the public server ip
could you forward on dumps MMASU my email address is chrisburt21@hotmail.com got exam on monday
any one have an up to date crack for vce only getting examtut with the one I currently have, if so can you mail to chrisburt21@hotmail.com
Can anyone clear up the ACL1 question #3 answer for me? Still having a hard time understanding it. The wildcard mask looks incorrect. It looks as if A should be the answer. I would very much appreciate your feedback. Thanks!
How to do you test if Modification 2 worked?
mashallah i passed with 972/1000 acl1,acl2 and EIGRP it was easy gys
Hello All,
Cleared my exam on 20th June 2014, 986/1000,
thanks to 9tut :)
Dumps i referred – Matthew, waston, examtut(All qiestions are from dumps only – total 51quest)
Labs i got in exam – ACL, ACL2 and EIGRP
Regards,
Keep rocking :p
can you help me guys?? i want to pass the exam pls send to my email your reference for the exam thank you johnbincent_ebido@yahoo.com tnx
Dear all,
Can anyone tell me which software will be used in the exam, I heard it will not be packet tracer and the other software which will be used has no help ‘? ‘ feature, so am I supposed to memorize all these commands by heart ?
Dear Aysha
The CLI that you will use is not a software, but rather a simulator, where some of the commands work,(not all of them) so far I have heard of everyone saying that nor the Tab or ? features are able, meaning that YES YOU WILL have to MEMORIZE all the steps by heart.
Which from my personal opinion is not a big deal, my advice to you is :
PRACTICE PRACTICE – PRACTICE- PRACTICE – PRACTICE – REPETITION – PRACTICE! –
- Organize
- Focus
- Go step-by-step, if you still feel doubts, Re-do it, re-Read, if you still are not able to, then as last resort look for help on the internet.
Good Luck! and once again PRACTICE !
In real exam dey doesn’t give those ip address so what command iz used to know the ip addreses of both pcs and servers
Hi all i passed today with 890 as i have prepared within 2 days for exam .
Here is it
I got 3 total sim
acl – just select correct options
acl 2 – with c accessing http and rest of alll will deny and at last permit ip any any
please be careful while selecting multiple choice question you will easily get confuse if u don’t know ans – for example default-network and default-gateway so prepare question solution fully so you don’t get confuse
in Eigrp sim i got as number 122
they have given you ip address for particular routers make sure your central router have 3 routes when u do sh ip eigrp nei
fault is wrong AS number and one router missing in central router just check routes given in question if any missing routes are there then add that network
this eigrp is my last question 51 i have completed it and suddenly i got error so they restart pc and i got same eigrp sim but with as no 23 same faults
no passive command found
core to isp there is default route already present
at last ping every ip given in question if ping is successful then you are good to submit your sim don’t forgot to save config multiple times
if any one have any queries you can skype me
Got 1000/1000 today 24june2014
CCNA exam is so easy i took this without any pressure ACL1 same ACL2 different Ips 3rd modification eigrp different AS value and totally different Ips topology diagram is al little bit change DNS server was not included OK chill man!!!!!
just to clarify something, i have passed the exam 5 days ago with 1000 and in the simulator the tab key and the question mark are enabled, everything like real devices were there so dont be worry about it
Thanks 9tut, i passed with 1000 (yesterday 25 juny 2014)
All questions of 9tut and lab sim : acl,acl2 and eigrp
In my exam, modification 3 of this acls lab
please, i just want to write my exam..i have read several times but i was advice to get dumps and practice with the question over and over again.. how can i get the latest dump ?
I have passed my CCNA exam today with 986 score. The was 51 questions, ACL1, ACL2 with small changes and EIGRP. Just my advice practice, practice and practice, all questions were from 307 brain dumps practise examtut, 9tut and pass4sure damps. Also be familiar with exam portal itself. However, there will 15 mins exam tutorial practice available for you to be familiar with the exam portal itself. Read the questions very well as you cannot go back.
Good luck.