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:
@vouchers
don’t use these vouchers, you can get a lifetime ban on all cisco exams and nullification of all previous certifications.
BEWARE!!!!!!
why was acl on the first one in outbound direction and not inbound?
don’t worry figured out was confused thinking the direction it was going was inbound but in affect its outbound
hey
how can i get the updated Simulation ?
reda_ashour@hotmail.com
For Mod 1 and 2, the third line “permit ip any any” doesn’t seem to work. Should it be “access-list 100 permit ip any any”?
@kindred: Yes, it means “access-list 100 permit ip any any”. We have just updated it so that no one will be confused.
@9tut: Thanks!
Please can someone help me out with WATSON and MATTHEW DUMPS (isa_muhd@yahoo.com)
I passed my CCNA yesterday with 1000/1000 , my prep materials includes ;
ccna routing & switching by odom
watson dumps
9tut
all questions are from watson aside from three new questions and the labs are ACL1 (word for word from 9tut) , ACL 2 (modification 3 from 9tut) & EIGRP (same concept from 9tut but router names are modified) . cheers
has anyone the vce simulator 1.1.4?
pkyr13@hotmail.com
Passed today. Scored 890. ACL2, ACL, EIGRP sim questions.
Prepared using watson dump and 9 tut after studying and watching CBT vdeos.
Hi, why was it outbound?
Is the vce simulator1.0 Watson 314q still valid?
i have passed ccna and get 1000/1000 …. thanx 9tut
if some body want dump send to me email i will send to
@ahmed ,, kindly send me the latest dump i will be thankful and the labs exam ,my exam will be next Sunday,,, maazoud90@gmail.com
B.R
Got passed day before yesterday 958. 9tut is the best
advice for one who z going to appear .
please carefully go through dums. there would be change of order of options. so don’t cram like 2nd 3rd is correct rather carefully learn the concept and content. otherwise problem.
NAT Lab. modification3rd is important, where 4 requirements to be covered in 3 commands. so please prepare all the modifications and subnet Masking very carefully.
Thanks CORVIT, Farman Sb, adnan, Shafqaat, Tahir sb.
ACL-1 is ditto . and EIGRP also need be prepared very carefully. copy running-conf start
also routes to be advertised on both Routers R1 and R3 after restarting EIGRP 212.
Pls pls be carefull.
@ Kamran
Is it NAT Lab or you are referring to ACL 2 Lab with mod 3?
@Ahmed, Hi could you kindly send the info to my mail add:mfrancis2@fnb.co.za it will be greatly appreciated.
Hi every one, Is the vce simulator1.0.2 Watson 314q still valid?
amaro.macedo@outlook.com
Hi Ahmed,
could you please send me the dumps.
ricky.dickinson@hotmail.co.uk
thanks, much appreciated.
Hi ahmad,,, Hi everybody
I’m having my exam tomorrow… I just concentrated on the question in 9tut…
Any advice ?
I’m preparing the labs ACL, ACL2, and eigrp…
I notice someone talking about NAt-lab… was it in the exam recently ?
This is my email:
husseinballout90@gmail.com
Hi I will be taking my exam this week. Can someone send me latest dumps from Watson and Matthew. Email is Benk4c@yahoo.com
Good day all,
I will be taking my ccna exam next Monday, can someone please send me the latest dumps from Watson and Matthew. You can email me at mnqchen@yahoo.com.
Thanks.
Is the lab eigrp and acl 1,2 in 9tut sill valid?
@Enrique,yes practice them well coz thats what you going to see on the exam.
can anyone send me the new vce 1.1.4 , plzzzzzz my exam is on Friday (i can’t open matthew with 1.1.3)
pkyr13@hotmail.com
passed 1000/1000
thanks to 9tut and to all you guys who’s comments were helpfull.
it’s true that in acl mod 3 “permit ip any any” is the right answer!
ospf and eigrp simlets are simple if you know show commands and concept of that protocols
acl simlet is the same
in eigrp lab was a little bug: after convergence, the next hop ip-s in some routes in central router’s table was matched interface ip’s of the same router, but exit interface is specified correctly.
dont pay any attention to this,it doesnt matter at all
passed 945/1000
9tut is the best. ACL mod 3 pc4. EIGRP AS 112.
@BESA
in the exam have ospf? so you mean have acl, eigrp and ospf lap? i can’t find ospf lab sim in 9tut :(
can you say about ospf sim ?i plan to do ccna exam in five days :(
@truong syh
can you talk about simlets in the exam?
@enrique it’s not config sim, there’s 6 router topology and 4 questions why adjacency not forming between two routers
see 9tut.net there’s some explanations about that sims
Thanks 9tut for giving the greatest tip ever. I passed my exam today. Thank you for sharing your comments and your experiences with us. ACL mod4, EIGRP 112 and OSPF questions about adjacency between routers. For OSPF you just need the show running-conf to check the problems and answer the questions. The questions are just similar to all 9tuts provided in the website.
Good luck for those who are taking it next!!!
@besa
thanks you, but my exam is 200-120 .thinks that different with ICND 1 and ICND 2 ?it’t right?
@besa
what do you test? ccna 200-120 or ICND ? i think it diffirent?
@enrique until this week that simlets were only in icnd exams, but now they added to 200-120 ;-)
@besa
really?:( hichic. thanks you so much. a have failed exam 9months ago. I’m very worried about it !
Is anyone take part in Ccna 200-120 today?
Yes I will today at 4:30 PM and will keep you updated about new questions
if i understand correctly,is there any changes about the exam..because i give on Friday
I did mine today and got 1000/1000, there were 2 others sims in the exam which you will be asked 4 questions for each. They’re ospf and eigrp troubleshooting sims
All the other questions were in the watson dumps plus a new etherchannel question which is in the new questions 2 section on 9tut (question 4)
@han25 can u post these labs with the answers of them…otherwise mail them to me
pkyr13@hotmail.com
https://www.youtube.com/watch?v=Q7cTJsVxebc&list=PLF3JXcGq4iLEYCucsr8acdiUvZ-AF198e&index=1
full ccna exam and dump
@pkyr13, I don’t have the labs and they’re not on 9tut as far as I know. You don’t have to configure anything you just have to answer 4 questions (each) about what is wrong with the configurations by using show commands (show run, show interfaces, etc) all from the privileged exec mode (you can’t enter the config terminal).
They’re all very straight forward (example: the interfaces are not on the same area or the eigrp AS does not match) just read all of the questions carefully
@han25, is that one of these two OSPF sims?
http://www.9tut.net/icnd1/labsim/ospf-neighbor-sim
http://www.9tut.net/icnd2/icnd2-labsim/ospf-sim
anybody can talk about new eigrp and ospf simlet ?
how question?
I passed the exam today. Almost all the questions were from 9tut. Labs were acl1, acl2 , two Eigrp labs ( One was posted here the other was new, it was about finding out information on why two end hosts are not communicating. There was no configuration, just finding out information, and a final new OSPF lab which were about troubleshooting area numbers and why routers are not forming adjacencies. I ran out of time and was not able to do the OSPF lab but still passed with 958.
@9tut
(All hosts in the core and on the local LAN should be able to access the Public web server )
can use this line?
access-list 100 permit ip host 192.168.33.0 0.0.0.255 host 172.22.242.17
because local LAN use address ranges 192.168.33.1-254
Public web server is 172.22.242.17