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:
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 ….. please why is it 0.0.0.15 and not The servers in the Server LAN that is been assigned addresses of 172.22.242.17 – 172.22.242.30 ?
‘passed my CCNA exam yesterday with a score of 972.
i’ve never been so happy :)) well anyways…
The exam has 51 questions. Labs were:
ACL1 – same as here at 9tut
ACL2 – it was a modification 3 (got wrong in 2nd syntax, so my suggestion is to read CAREFULLY in every instructions on this one and use the appropriate modification)
EIGRP – a slight change in topology, with an AS# of 12 (accg to my exp, instead of adding a network in Router1, you have to replace the wrong network by the network given in Router1)
these are things that helped me a lot:
Training Center, CBTNuggets Tutorials by Jeremy, 9tut (much appreciated! ^_^), Watson, Matthew & P.Tracer
I hope this helps :)
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@ temidayo
If you use wild-card mask 0.0.0.15 within the access list statement:
access-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15
then you ensure, that the host 192.168.33.2 would not be able to reach any of the servers.
Servers IP addressess are from the subnet 172.22.242.16 255.255.255.240 (wild-card mask 0.0.0.15 is ‘binary inversed’ subnet mask 255.255.255.240).
Hope this will help you ;)
Hi Guys just passed the exam on yesterday
very simple exam all sims r ACL, ACL2 and eigrp ACL and ACL2 are exactly the same as here in eigrp is just AS no is diffrent.
just relax and do it ur best u ll pass the exam
anyone need help just buzz me ur email here and i ll get back to u
wat abt eigrp lab sim. for ths we hav to verify in router r3 by command ping with all other router ips. ?? deepak.dav94@gmail.com
Please someone send me ccna 200 120 dumps at arshadraja17@yahoo.com id
@ccna passed .. is there one change in eigrp or two change. ?. because as here in 9tut there is 2 change AS number change and Network missing change !! pls reply
taking up ccna tom pls help me with some tips .. since july 1 is there any possiblities for change of questions? topics covered: watson dumps , examtut, lab: ACL , ACL2, EIGRP !! is this nuf to crack ccna ?
Please someone send me ccna 200 120 dumps at zulqurnan2010@hotmail.com plzzzzzz
i hav prblm wid that acl 2 modfcatn num 3
access list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
access list 100 deny ip any host 172.22.242.23
access list 100 permit ip any host 172.22.242.23
i hav enterd the command the above but i didnt get the ans pls help me wcich mistake i did here?????? plz solve that???
in second command access-list 100 deny ip any host 172.22.242.23 u made mistake after this command insert “eq 80″ it must work and after deny command access-list 100 permit ip any any must be given give this it ll work
@ranjit .. for clear view of modification 3 try this
access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
access-list 100 deny tcp any host 172.22.242.23 eq 80
access-list 100 permit ip any any
then insert
#int fa0/1
ip access-group 100 out
ex
ex
#copy run start
thanks @lia i got it but its similiar to modfcatn 2?
yea moreovr its similar in exam u ll b asked to allow access from any host may b pc2,pc3 as i hv listed above keep this as a default commands and just check which pc u hv to allow access to finance server .. if its B thn 192.168.33.2 (i think u r gettin me) in command 2 so … thats it dont get confused u ll mostly get modification 3…
@lia thanks 4 ur respnse
“Not allow anyone else in any way communicate with the financial server” for ths we hav to deny web access in server by all host or just denying ip for ths web browser by other host ???????? …. reply plz….
for ths command “access-list 100 deny ip any host 172.22.242.23″ if we give it just not allow ip packet to tht server but it allow web acces to ths server by all other host . ths answer s correct for mod. 2
Ya financial server blockd by that cment that s also used in mod 3
This Sim was there for my exam
ya but the question s to block only access to server or the acces to web access(http) in that server by other host?? … if i give ths command “access-list 100 deny ip any host 172.22.242.23″ all pc can access web (http) in financial server .. s ths correct /???
anyone send me the latest dumps wch one s to complicate to answering , i m having examtut,watson,mathew,gilbeast my email address ranjithkumar9328@yahoo.co.in
Hello Guys, Just today, I passed exam with 958 /1000, ACL 1, ACL 2 & EIGRP was exactly the same in 9tut, I could practice a lot wiht the help of 9tute, Remaining all questions were so simple to answer like drag & drops, HSRP etc, Best luck ! Thanks
@deepak:i think all service to b blockd
@balasahe wch dumps r u practse most
it’s pass4sure, all the questions was from the same, I completed exam in 70 mins only.
That was very easy questions, I thought questions would be related to interVLAN, summarization, RSTP, OSPF, etc. but thanks to 9tut, all questions are here only.
@ranjith but the question said to block any access to financial server it does not mention the web access(http) to tht server. ?? …….thts wat i cant understand…
Guys you should download dumps and many other helping materials from
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Its a direct and safe download and the download speed is ultra high.
Also the dumps is super easy to download.
Enjoy.?
@anonymous how to dwnload the abve dumps?
Anybody how to prepare the eigrp sim? There s oly as num change r nw mising type of sim available? If not tel me abt that
Hi guys I am preparing my CCNA. if someone can help me reply with dumps i would appreciate it, aamirbsohail@gmail.com
Did my exam yesterday///972/1000
this website is good…….labs acl1..acl 2 and eigrp…
i took the exam for 18min…
so easy
@ lia
yeah there are two change in eigrp
1. There is one wrong network advertised so u have to use no network X.X.X.X and advertise the missing one
2. Wrong eigrp AS no. Exactly like here
If you need more help dont hesitate to buzz me
@CCNA passed we hav to remove the unknow network and add the mssing network rite???
i have prepeard 24hrs 9.tut & got 900 marks.
is it still applicable to use the “permit ip any any” statement at the end instead of the “permit ip any ” as stated in the comments and by 9tut?
Passed today, 3 Jul, USA, 986
ACL, ACL2, EIGRP
51 questions total (with the sims, drag & drop, multiple choice).. as mentioned before, read the questions/instructions and answers carefully. Also, do the tutorial at the beginning to see how to answer each type of questions and how to move around in the sims.
ACL – same as here
ACL2 – I got the Mod #3, it was Host B (instead of Host C), IPs were also different
EIGRP – similar to here, different AS num, also different networks
I studied from ActualTests dump, which I have subscription for. I also studied all sims from here … Thank you 9tut.
Hope this info helps out others who are looking to take the test soon.
In the exam –> ACL2 MOD 3 :
shall we use
access-list 100 permit ip any host ” Public Web Server ip”
OR
“access-list 100 permit ip any any”
i heard the bug has been fixed ?!!?
please help if you got 1000/1000 or sure about exactly which one to use !
@bilo
I used:
access-list 100 permit ip any host
when I tested from each PC, Host B (in my test) was able to access both the Financial and Public web pages…while all other PC were only able to access the Public
so it worked for me on my test …
Hey I have my exam next friday. Which network should be removed from the eigrp lap? and should we remove the network in any modification of the eigrp lap?
@ Henry
thank you for the detailed information :)
@ Henry
Both should work in theory (and practice) but the thing is there was a bug that only gives the full mark when using “access-list 100 permit ip any any”.
Do you know what was your score on this question ?
What was your overall score ?
Thanks
@henry where those ip address been given on exam
Thank almighty God l passed after second attempt . My advice to students , please don’t depend on dump but know the principle’s on each topic, practise daily, configure daily, know the cmd very well , l assure you , you will pass 9tut is very very good for your success, know the modifications well enough you will pass because l passed excellently . Good luck people.
Thank you 9tut! I passed with score 972! Were 2 labs: one exactly like this with access-list and another one eigrp!
@lucky wat dumps u prepared.. ??? reply plzz……
@ Austin: I will repeat my failed exam on friday >___< I am so nervous. I learn with 9tut and the Gilbert 299 questions
@ Austin: Congratulations :)
I will repeat my failed exam on friday >___< I am so nervous. I learn with 9tut and the Gilbert 299 questions
hope why ur exam failed?