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:
@zaw, you can’t because with that range of soure ip addresses (192.168.33.0 – 192.168.33.255), you will permit access only from the local LAN, but not from the Core, because there is an implicit deny at the end of ACL, so it will deny access from the Core if you don’t explicitly permit it.
The last statement for the acl has to be:
access-list 100 permit ip any any
Hi, I passed ccna today 972/1000, LAB ACL1, ACL 2 mod3 and EIGRP
Thanks 9tut
Arai you got questions
exactly as they are in 9tut site ?
@Arai you can talk about new eigrp and ospf simlet ?
I passed yesterday, there are new simulations in CCNA, one OSPF and another EIGRP, @Arai mentions three, the others sims have six router and a switch… thanks 9tut
@JC, did you have this ospf sim? http://www.9tut.net/icnd1/labsim/ospf-neighbor-sim
where can I download this watson dumps, or can anybody mail me them(amandiprity@gmail.com) thank you!!
@ fillip, the ospf troubleshooting sim is the one in the first link you posted, yes. The second link sim isn’t in the exam. The eigrp troubleshooting sim is similar to the ospf 1st link you posted
i passed today the exam , mathew was enough for the exam , i had just 3 lab questions eigrp +ac11 and acl2
tnx, han25 :)
passed today the exam with 1000/1000. just 3 LABs ACL 1, ACL 2 mod 3, Eigrp AS 12.
there are 4 question came up. Etherchannel, OSPF.. i didnt encounter the new simlet OSPF and EIGRP..
Passed today. ACL1 ACL2 EIGRP sims.
Passed!!!! same ACL1 ACL2 EIGRP sims….Etherchannel question came up. Make sure you fully understand and practice sims
Passed today! 3 labs . acl1 ,acl2 , eigrp as 112.
there are 1 qns each from new questios, (hsra, snmp, netflosw,ethernet channel,syslog, ospf3)
..etc.
Acl 2 to , ip changed , and connectivity between host b and finannce server. (not host c).
Acl 1 :- choice qns .
Eigrp 122
Dont forget to study new qns also , from 9tut…
Passed Today! 3 Labs (ACL1, ACL2 and EIGRP as 112) + 48 Multiple Options questions (Watson and 9tut are the best. Thanks a lot for your help).
¡Good luck!
in my packet tracer don’t have “eq” parameter….anyone can help ??
Hey cleared my exam yesterday….All questions from watson and ACL, ACL2 AND EIGRP. I did not encounter new lab in my exam…its party time…All the best guys :)
my exam pass today 972.Sims ACL, ACL2 different ip mode 3 and EIGRP AS112.
thanks 9tut and watson.
everybody good luck.
@ anaonymous re: in my packet tracer don’t have “eq” parameter….anyone can help ??
You’re probably starting your statement with the ip parameter, in this case you need to use tcp so that you can include/exclude web (www/80) access to the server
Hi everyone. pass my exam today 986. Sims ACL, ACL2 different IP – mode 3 – looking for Host B to get access to Web Server. EIGRP AS22.
I think all question are in 9tut, 90% any way. I only study watson dumps and 9tut.
Good luck to everyone!!
Thanks 9tut.
Hi to all,i just passed my exam today, 1000/1000 in 35 minutes….
52 questions and 4 labs…acl1,acl2(mod2 differents hosts and ip`s),eigrp and ospf adjacencies
All u have to to is study from 9tut,watson and matthew and it`s SUPER enough
P.S 1 question about speed mismatch in etherchannel
Good luck to all
Thanks 9tut.
There is no need to go for any dump or VCE just read and understand all the question of this site one time.
Best of luck
I want CCNA exam plz send me the latest dump(mdzilani1989@gmail.com)
passed today 1000/1000. 3 sims: eigrp 212, acl1 and acl2 mod 3 (my answer to 3rd command is; access-list 100 permit ip any any). There were slight variation on some questions like; which ipv6 address is valid? same approach/scenario but diff. hex values are given. Also the new question about trunking the interfaces and where to configure the ip address came out. The rest are pure dumps, 9tut and Watson. Only used Todd Lammle for review. Good Luck and God Bless to everyone! :)
Hi everyone
Yes third command should be “Access-list 100 permit ip any any”. Because multiple resources means it include the “DNS server”. So if the users need to use WWW they need to resolve hostnames, which means before they try to use Finance Server in the server location they need to communicate with DNS server. So it should be “Access-list 100 permit ip any any”.
Thank you.
is Nat sim is necessary?
No, there is no NAT sim in the exam
Can anyone send the latest dumps to donaldmbusch@gmail.com? Thanks!
me pass my ccna exam today
i got 958
great job 9tut
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TD, Asa@ yes, new questions were troubleshooting new EIGRP and OSPF
TD, Asa@ yes, new questions were troubleshooting new EIGRP and OSPF
thanks very useful
Thanks 9tut +Watson dump.
I passed Yesterday, score: 1000
3 sims: eigrp 2, acl1 and acl2 – mod 3 (my answer to 3rd command is: access-list 100 permit ip any any).
There were slight variation on some questions.
there are one question each from new questions (hsrp, snmp, netflosw,ethernet channel,syslog, ospf3).
“?” and short commands are ok.
Thanks and Best regards.
@CCNA
“Eigrp 2″ did you mean eigrp modification 2 or AS 2?
Hi,
no Eigrp configuration on central router and no gateway of last resort.
Good luck.
Just passed. Score 958.
In this question, beside the already notice IP in interface to core wrong (i wans’ t able to ping Core, using 198.18.196.65 or 198.18.196.66. I used .65), ther is a neighbor that didnt show in any configuration of any routers. I take it off too (since isnt in use by no one router).
I dont know i which part os % grades thisnlab are included, but i got 90% in routing, 100% in TS and 80% in WAN)
I wish the best for every one that are trying. Good luck!
Hi all,
In the Modification 1 it says “deny host B from accessing other servers (not the whole network)”. Shouldn’it it be access-list 100 deny ip host 192.168.33.2 172.22.242.17 0.0.0.13, knowing that “The servers in the Server LAN have been assigned addresses of 172.22.242.17 – 172.22.242.30″?
Thanks in advance.
Lliure (lliureferre@hotmail.com)
CCNA Access List SIM 2 is wrongly configured in this example..
Here we want to block web browser access (tcp 80) and we must be used extended access list range not standard. so the right confg are:
access-list 101 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
access-list 101 deny tcp any host 172.22.242.23 eq 80
access-list 101 permit ip any any
i have done the lab and extended acl is working.
Pass 917. thanks 9tut , just read 9tut questions, the simulations questions are EIGRP,ACL1,ACL2
Pass the exam today 986/1000
Labs include EIGRP AS 212,ACL1 and ACL2 mod 3(different IP and host used)
1 question each(etherchannel,SNMP,syslog,VRRP)
No additional simlet
Huge thanks to 9tut and matthew.
Good luck guys!!
Adnan, the acces list number 100 is correct for an extended access list, so the question is correct: standard acces-list {1-99} , extended acces-list {100-199}, IP Extended Expanded Range 2000–2699
i have just passed CCNA with 917/1000,3 hours ago, thanks to the one and only Allah , the sims were :
ACL 1 , ACL2 , EIGRP & EIGRP + 48 Questions , No Drag and Drop Questions were in the exam.
, if you need any help you may contact me on Mohmmedbugazia@gmail.com
i wish you the best of luck, Peace!
Oh , and Thanks 9tut for the great Help, you won’t need anything other than 9tut it’s all here (ofcourse after you have already studied and understood the CCNA Topics) i would recommend CBT Nuggets or INE Training , both are amazing , INE is more in depth , while CBT Nuggets is more interesting and fun .
Which version of VCE player did you guys use to open mathew and watson dumps? I am using version 1.1.5 and its not opening those vce files. Hope to hear guys.
Thanks..
thanks 9tut i have passed ccna exam wiht 890 marks. eigrp and acl labs very important for ccna exam
passed with 958 marks today…. thanks a lot 9tut …. (Y)
Hi, I have just passed CCNA with 986/1000
ACL1, ACL2, EIGRP 2 and 48 questions from 9tut.
Good Luck