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:
If there is a passive interface, where do we remove it from? Assuming we are removing it from fa0/0 (2 following lines, 1 with router, 1 without router) HELP!!!
R1(config-router)#no passive-interface fa0/0
OR
R1(config)#no passive-interface fa0/0
Nevermind. I tried it on my packet tracer. Answer is to apply the command on the router R1(config-router)#no passive-interface fa0/0
very very thanq 9tut actually i got 973 marks but i did not mistake very was it mistake i could not understand…..but not the marks first pass or fail best once again tanq 9tut,…………………
very very thanq 9tut actually i got 973 marks but i did not mistake where was it mistake i could not understand…..but not the marks first pass or fail best once again tanq 9tut,…………………
9tut seriously you are the most useful site I’ve seen so far .. and the people here were very helpful.
I passed today with 933 .. I used Cisco.Lead2pass.640-802.v2013-09-19.by.Kraven.670q.vce
The Labs was ACL2, VTP, and EIGRP. When I started the exam I faced the EIGRP and forgot everything about EIGRP cuz I was so nervous and didn’t it coming, actually It took me 15 mins to calm down and think properly.
To everyone who wants to enter the exam just bite the bullet and study very very well, I studied this KRAVEN exam 670 Qs twice in four days. Just study well and be confident about yourself and GO FOR IT.
hope you all pass it :))
I have passed my CCNA certification today “alhmdoulillah” with score of 920, Labs ACL, VTP and EIGRP sim, my suggestion for clearing the exam practice the dums and be clear of the concepts of each and every Qn. and Answers. My special thanks to 9tut site which helps me to understand the concept to pass my CCNA and thanks to sybex.
I passed my exam today….@Mziwanda…..I got the same access list sim-2 as yours….thanx for your idea….Thanx sybex!!!Thanx 9tut and spike!!!!…………………CCNP alllllllllllllllll the waaaaaaaaaaaaaay
Passed today with 907 score!! thanks so much 9tut!!!
Passed the test today! 986/1000 Labs ACL2 host B modification, VTP and EIGRP
Thank GOD !!!
I passed the exam today, last day! lol … Brazil in the exam had acl and frame relay (5 questions), the command show frame-relay map did not work at all! I lost points on that question!!
command show frame-relay map did NOT work!!!!!!!!!!
hey guys a failed the test 640-802 today any inputs about the 200-120 new test? Or the new 200-120 dumps. please help.
passed the 640-802 exam yesterday Sept. 30th…973/1000 thanks to spike and 9tut. Sims where VTP, ACL2, EIGRP.
I have a question though, the preliminary report says “CISCO policy requires that you wait a minimum of 180 days before retaking an exam (with identical exam number)” even though I passed the exam. what does it mean? or what is it for?
Hi 9tut, thank you very much. This site is very useful. I’ve passed the exam last 9/28… I reviewed labs only here.
@ B/Gen not sure why someone would pass and want to take the same test over again after 6 months.
Anyone – Did your exam say anything about under Please Read Important Information – The score information displayed in this report does not constitute and official score report…. a) classified as indeterminate…. b) Classified as valid….etc?”
Passed CCNA yesterday, the very last day with a whooping overall score of 973/1000…sims tested were on Access-list2, VTP and EIGRP. for ACL2 host A was to be allowed http access only to the finance web server. then all host was to be allowed access to the public web server… for eigrp AS number was 12….
All thanks to Jeremy Cioara CBTNuggets, Spike dumps, and 9tut…
See y”all on my way up the trail to CCNP…God bless this forum.
I found it on gns3 forum. I must say, awesome lab manuals.
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HELLO CCNA GUY MANY THANK TO 9TUT I VALIDATED THE EXAM ON THE 27/0902013 SCORING 889/1000 AND I MADE A ?MISTAKE IN VTP SIM QUESTION SO WHAT UP NEXT I MEAN CCNP GLORY BE TO GOD 9TUT IS A GOOD SITE TO STUDY FOR THOSE OF YOU WHO WANT TO DO CISCO NETWORKING I SHALL SENT MY OWN DONATION WENT I HAVE MY CREADIT CARD
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Thanks !! guys
I’ve just passed my 640-802 CCNA exam with 960/1000. VTP, ACL 2 , and EIGRP were on my exam. EIGRP lab is just area changing into 221. Q & A is spike and acme is valid. These two are enough for your exam. For lab, 9tut is the best. Thank 9tut.com. The exam is as easy as a piece of cake. You are just worried for $300. Don’t worry !! It is easy one. If you want to know more information contact me.
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Thankz 9tut
Congrats 2 u all for making it in the CCNA Old Syllabus. Please could anyone direct me to a site similar to 9tut for CCNP exams. Thanks and my Appreciations
jst studied 3 days and i have passed the exam .
thanx to Allah.
thnx spike and 9tut
any body help me what difference the new version… thank you
Hi everybody this lab was in my test 200-120 today! with the another host D.
Thank You Jesus, i’ve passed it on monday 920/1000!!!
First attempt. Labs were EIGRP, ACL2 and VTP.
Used ACME dumps v694q, which are almost with no errors and valid 100%. All questions were from this dump as far as I remember.
EIGRP and VTP labs were a bit difficult for me, cause for example in EIGRP Lab I had
— passive-interface serial1/0 — line.
But the lines
— ip gefault-network 198.0.18.0 —-
— ip route 0.0.0.0 0.0.0.0 198.0.18.5 —-
were also in config-file!
ALso I wasn’t able to ping 198.0.18.5(ISP-Router) anyway. I’ve tried to delete “passive-int…” – no effect. Then I’ve added it back – no effect still. I’ve lost my time – and no effect… Other pings went well. Don’t know if it’s bug or not.
VTP lab was close to the one given here. But Other numbers and interfaces.
Anyway, I’m glad. Thank you Lord, thank you guys, thank you 9TUT and examcollection.com
Good luck to anyone. God bless!
@ George I had the same problem with EIGRP lab Spent about 40 minutes on it. The only passive interface it had was the one you mentioned on S1/0 on ISP. No point removing that but I too tried to remove it as I was not able to ping ISP. I even removed the default-network 198.0.18.0 but added it back. Definitely a bug with eigrp. I left what I did and moved on and passed but EIGRP shook me up and I panicked. Anyone experiencing such, just stay calm, remove your wrong eigrp #, add the correct eigrp #, add the missing networks on Perimeter and fiddle a little with the rest – look for any passive interfaces. Leave the Default-Network ALONE!! Not much you can do if there is a bug but once you can do the above remove/add eigrp # you will be ok.
@Anonymous
True, looks like it’s a bug. There was also one extra network at EIGRP config at the main router. There’s no IP any address of that network anywhere in the hosts, so I’ve just deleted it with a command “no network x.x.x.x”
passed the exam with 986/1000
thanks to 9tut and exam collection, peace of cake after a lot of effort and study
Is there a site like this CISSP?
anyone guyz who knows how to remove a “passive interface s1/0″? is it correct to use this command (config)#no passive interface
I am nervous for CCNA Exam……
Just passed This Friday Oct 4. Test Is valid. Thank you.
@ diza55 RouterName(config-router)#no passive-interface interface {s0/1} in this case. But do not remove the passive interface on the ISP.
passed the CCNA 200-120 exam
scored 972/1000 and this was the same Lab.
The criteria was:
- 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
- All hosts in the Core and local LAN should be able to access the Public Web Server
thanks 9tut.com finished the complete exam in just 20 minutes.
Some one who finished this exam recently verify the new question in the below like are valid.
http://www.examcollection.com/cisco/Cisco.Actualtests.200-120.v2013-10-01.by.examtut.278q.vce.file.html
Thanx to 9tut for CCNA exam…now can anybody help me for my CCNP …..shall i do ccnp switching first or routing first. And where will i get the study material ???? pls friendz help me i have only 2 months to do what ever i want ??
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in the secound modifications for Host B why 16 not 17
-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15
sir i want to know all the information about ccna
This is for the all the people who get confuse for
“deny host B from accessing other servers (not the whole network)”
answer 9tut has given was “access-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15”.
it because of this reason.question says deny it from accessing ALL OTHER SERVERS. In the top of the question there is a address range for server lan (172.22.242.17 – 172.22.242.30).from it we can derive it network address which is 172.22.242.16 .so best way to block multiple address range is putting its wild card mask with it which is 0.0.0.15 .In wild card mask 0 is prominent which is if wild card mask has 0 it says to compare the address with the address given in the access list and the other numbers which are not 0 will be ignored.
So access-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15 means,
172.22.242.16 (which is network) plus any addresses that can be made with it will be blocked.
172.22.242.16+1 …. Upto 172.22.242.16+15 (logically u have to deduct 1 for broadcast).
So some may will get a question like if its block the whole address range will it affect to 172.22.242.23(finance server) which is in the same address range. No its not, it’s because like in some of the computer programming switch read the statements from top to bottom.
So
First – access-list 100 permit ip host 192.168.33.2 host 172.22.242.23 (If first true execute,if not true go to the second)
Second- access-list 100 deny ip host 192.168.33.2 172.22.242.16 0.0.0.15(If Second true execute ,if not true go to the third)
Third- permit ip any any (if above not true execute)
In fact, I appreciate your explanation i was confuse for
16 now i know it is the network address
and also the command affecting the finance server 172.22.242.23
and now it is clear thanks alot Man Jay
@Man Jay thanks a lot u have cleared my all confuse about that access list statement
Can someone please tell which sim are there on the 200-120 exam, i want to write ASAP
Just passed my test today! 931/1000. Labs were Acl Acl2.
can someone please send the latest CCNA 200-120 dumps to shams54@aol.com
Thank you
what is wild card mask for the range of 10.0.0.16 to 10.0.0.23.. and tell me how???????? thanks rely soon