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:
Help me guys when I enter the MOD3 config on the cisco packet tracer
access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
im having error on it why? please help.
nevermind I resolved it, just a glitch! :)
I’M a new student who want to make exam , thanks for you are comment and thank it will helps us
can some one send me the lastst dump?
fett47@hotmail.com
pls does anyone have an idea if these dumps and aims are gonna be valid in sept (next month). thanks!
passed the exam today with 1000/1000 labs eigrp acl,acl1 with mod 1, dumps watson!!
labs acl1 and acl2 eigrp same
pls anyone with a short material on syslog, pls forward to ayolatinwo@gmail. com would really appreciate, thanks!
@Ayo…on the page where u have Syslog Questions (the right pane on this page), there’s a link to syslog tutorial there.
Thnx 9tut! I passed 986/1000 29th of August.
Labs EIGRP, ACL1 and ACL2 (modification 3).
thanks 9tut! i passed the questions are accurate no need any dump
Thank you 9tut…. ALL THE QUESTIONS FROM THIS WEBSITE……..SIMS ( ACL 1 , ACL 2 , EIGRP)
EIGRP WITH AS NUMBER 23 …… ACL 2 MOD 4
9 TUT ROCKSSSSSSSSSS
i have passed my ccna exam with 1000 on ist of September.
This simulation was present with little modification .
9tut is best for ccna exam.
All question was from 9tut.
i failed exam today and want to retake it, will i pay money for it again ?
Hi Ali,
Kind I know what kind of modification that have been made for this simulation?
@Mran could you plesae tell me what is for the LAB u get?
why do u fail?
I fail before two month ago.
thanks you good luck all
@seagiant
how did you retake your exam again?
@seagiant
how did you retake your exam again?
Hello guys,
I passed my exam today. 945/1000 i dont know where I lost points but now I dont care … Labs was EIgrp, acl, alc 2 modif 3. Good luck and thanks 9tut.
Hi Mathew,
Congratulation! Is there any modification been made for the simulation? thx:)
@Mran i pay the money again.
Pay full again.
Good luck.
Hi Sam,
thank you.
No there was no modification. Only in EIGRP I had to configure router on the right side and not in the middle, thats all.
@Mathew Thanks alot!! ^^v
to Daniel
modification number 3 is in my test
but the ip sachem was different
Thanks @Ali.. Already passed today.. ^^
LAB :
> ACL 1
> ACL 2 : MOD 3. Host B
> EIGRP : IP Address diff
Thanks 9tut. Watson as well.
:)
@Dainel
Can we use the Short-Command, like the TAP?
And what is it mean IP Address diff?
And did you have to go througnt all the questions in DUMP or just fews.
Thank you .
@seagiant
nope. TAB cannot being used in exam.
Ip different mean not as same as in this 9tut example. In the other word, they just change the ip. hehe
Yes. I had go through all questions in the watson dump. But make sure you dont just memorize the answer arrangement. But remember what is the answers. Because in the exam the arrangement is different not as same as in the dump.
:)
@Danial
thank you for ur reply.
if cant use TAB then we must chk if our command us right by “Show running configure” right?
do we have too use “end”. can we use “exit”. ex.(Corp1(config-if)#end)
thank you so much
I have just passed the exam with 945 points…. Thanx to 9tut…
EIGRP, ACL1 and ACL2…..
hi 9tut im confused in modification 1
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
could u tell me where u got 172.22.242.16
i will appreciate that.
@mcp3228
172.22.242.16 is the ip summary of the three servers (172.22.242.17, 172.22.242.20, 172.22.242.23) with subnet mask 255.255.255.240 increment is 16 . Since the servers using class C address 172.22.242.0 add the increment on the last octet you will get the ip 172.22.242.16 ….< 255.255.255.240 (11111111.11111111.11111111.11110000) = 0.0.0.15 (00000000.00000000.00000000.00001111) i hope it helps to you! :)
Thank you 9tut the questions are 100% valid and the sims also are up to date. I passed 972 out of 1000 and the sims were ACL1, ACL2, EIGRP. Watson dumps are great for practice however do not rely only on this read the info and understand it how it works (my opinion).
hi mathew!
can u send me the lastst dump
in mbydonat@gmail.com
thx
THANKS FOR 9 TUT I PASSED THE EXAM YESTERDAY 931/1000
Passed the exam yesterday with score 972 ,, studied from 9tut and watson dump ,,, sims were ACL1 , ACL2 and EIGRP,, thanks 9tut and good luck for all passing the exam ,,for any help contact me on abdohanafy@gmail.com
ahi abdo…
can u send me the watson dump?
i was planning to take the exam this coming weekend..
adonai_o7@yahoo.com
tnks..
BY the Grace of ALMIGHTY ALLAH.
i have passed CCNA 200-120 with score 972/100
i would like to thanks 9tut, CBT Nuggets, Urdu I.T Academy & Cisco Live Training:
in exam Faced same Sims as 9tut have,
ACL
ACL2: Modification 2
EIGRP: Internet addressing changed
51 Questions :)
thanks again all who support
~Murtaza~ University of the Punjab, Lahore-Pakistan
BY the Grace of ALMIGHTY ALLAH.
i have passed CCNA 200-120 with score 972/100
i would like to thanks 9tut, CBT Nuggets, Urdu I.T Academy & Cisco Live Training:
in exam Faced same Sims as 9tut have,
ACL
ACL2: Modification 2
EIGRP: Internet addressing changed
51 Questions :)
thanks again all who support
~Murtaza~ University of the Punjab, Lahore-Pakistan
Dears,
please let me know, which one is ACl 2 mode 3..?
Is it Ext-ACL or PAT ..?
yes,,,get it
I got a test yesterday and my score = 972/1000. i missed one multiple choice.
simulation is ac1,2 and eigrp. almost the same u can say exactly as 9tut
muliple choices and drag and drops 9tut and actual test
thanks 9tut!
hallo congratulation
please can you specifiy about drag and drop please ????
for million
http://www.bubblews.com/news/7026831-cisco-ccna
can someone explain me what is difference between using tcp and ip that using in access list command?
thank you
(ip) = all protocol (TCP, UDP)
but (TCP) or (UDP) you specified, for example: access-list 101 permit tcp host xxxx host xxxx eq = 80 (http or www) specifies you
http … ftp use tcp protocol (tcp)
purpose in (ip) for the router you tell use all protocol
@mbmxp3
Thank you very much i got it now.
I passed my exam today 958/1000. simulations acl, acl2 and eigrp (minor changes, read carefully the questions!!!), 2 drag and drops. I used 9tut for the labs and actualtest for questions.
hey guys im writing the exam tomorow morning wat changes are there please help.. have ust been reading Watson abd 9tut dumps what else?
@marian, can u pls specify the minor changes you came across, thanks. ayolatinwo@gmail. com