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OSPF Sim

March 18th, 2015 in Simlets Go to comments

Note:

To understand this lab you need to grasp about the OSPF network types, DR/BDR requirements and if “neighbor” command should be used in each type. We summarized all of them into this table for your quick reference:

Interface Types Use DR/BDR? Default Hello interval Require “neighbor” command?
Broadcast Yes 10 No
Point-to-point No 10 No
Point-to-multipoint No 30 No
Non-broadcast (NBMA) Yes 30 Yes
Point-to-multipoint non-broadcast No 30 Yes

Question 1

Explanation

Although we do believe the answer B “A neighbor statement needs to be configured in R1 and R3 pointing at each other” is better but in the exam you should choose answer C. Please read the explanation below.

Check the ports connecting between R1 and R3 via the “show running-config” command:

R1#show running-config
<<output omitted>>
interface Serial0/0
ip address 192.168.13.1 255.255.255.0
ip ospf network non-broadcast
<<output omitted>>
router ospf 1
 router-id 1.1.1.1
 network 1.1.1.1 0.0.0.0 area 0
 network 192.168.23.0 0.0.0.255 area 0

————————————————————————-

R3#show running-config
<<output omitted>>
interface Serial1/1
ip address 192.168.13.3 255.255.255.0
ip ospf network point-to-multipoint non-broadcast
<<output omitted>>
router ospf 100
 router-id 3.3.3.3
 area 1 virtual-link 4.4.4.4
 network 3.3.3.3 0.0.0.0 area 1
 network 192.168.13.0 0.0.0.255 area 0
 network 192.168.23.0 0.0.0.255 area 0
 neighbor 192.168.13.1

Or you can check these interfaces via the “show ip ospf interface S0/0” on R1 or “show ip ospf interface S1/1” on R3 you will see the Network types are “NON_BROADCAST” or “POINT_TO_MULTIPOINT”, respectively. For example:

R1_show_ip_ospf_interface_serial.jpg

Although the OSPF network types are mismatched but the Hello and Dead timers are still the same (30 seconds and 120 seconds, respectively) so an OSPF neighbor relationship can still be formed. But both interfaces are in “Non Broadcast” mode (no DR/BDR election) so they must have the “neighbor …” command under OSPF processes to form neighbor relationship.

Question 2

Explanation

We can check the OSPF neighborship on R3 first via the “show ip ospf neighbor” command:

R3_show_ip_ospf_neighbor.jpg

We don’t see the OSPF neighborship between R3 and R4 (neighbor 4.4.4.4) so something was wrong with OSPF. So we continue checking with the “show running-config” command and pay attention to the OSPF config between R3 and R4.

R3_show_running-config_missing_network.jpg

We can realize the link between R3 and R4 is not running OSPF (missing the command “network 192.168.34.0 0.0.0.255 area 1”).

Question 3

Explanation

Check the configuration of R5 with the “show running-config” command:

R5_show_running-config_authentication.jpg

Interface E0/0 of R5 is configured with OSPF authentication so we should check the configuration on interface E0/1 of R4:

R4_show_running-config_no_authentication.jpg

There is no OSPF authentication under E0/1 of R4 so R4 cannot establish OSPF neighborship with R5.

Question 4

Explanation

Only the 6.6.0.0 subnets are not reachable from R4 so maybe something blocking it (OSPF neighborship is still formed between R4 and R6. You can verify with the “show ip ospf neighbor” command). Check the configuration of R6 with the “show running-config” command and pay attention to the OSPF part of R6:

R6_show_running-config-distribute-list.jpg

From the output we learn that R6 is using distribute-lists to filter routes. Especially distribute-list 64 (note: 64 is the access-list number) is applied to:
+ Inbound direction on E0/1 (distribute-list 64 in Ethernet0/1): this distribute-list is no harm because it only prevents 6.0.0.0/8 prefix from learning back from E0/1. Notice that R6 can still advertise this prefix to the outside.
+ Outbound direction of all interfaces (distribute-list 64 out): this distribute-list is causing problem because it prevents 6.0.0.0/8 prefix from advertising to the outside ->R4 does not know how to reach 6.6.0.0 subnets. To fix this problem we should remove “distribute-list 64 out” on R6.

Note: Although the next line of this distribute-list allows prefix 6.6.0.0/16 but traffic for this prefix can never reach this line because the above line “access-list 64 deny 6.0.0.0 0.255.255.255” is always matched first and this prefix is dropped.

Comments (46) Comments
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  1. sirmonkey
    September 1st, 2016

    Passed with 1000.
    I had the OSPF sim. In Q1 above the wording on the actual exam asked what should be configured on BOTH R1 and R3. One of the routers already had a neighbour statement so this did not need to be configured on both devices. So the best answer available was to change network type on both devices.

  2. Rezabfa
    September 1st, 2016

    @sirmonkey

    congratulation on passing the exam.

    i am taking the TSHOOT in 14 Sept, i would really appreciated if you could send me any lab or study material so hopefully i can pass this exam.
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  3. Anonymous
    September 6th, 2016

    Congrats sirmonkey. tell me please they give the tickets one by one and we have to ask the 3 questions regarding the ticket or they give one question from ticket 1 for example and then the next question from ticket 10??

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    September 15th, 2016

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    ______________________________________________________________________

    You have to ask your self Is it ipv4 or ipv6?

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    R2: (T12) IPv6: enable ospf 0
    R3: (T15) IPv6: remove “tunnel mode ipv6″
    R4: (T16) missing Redistribution from RIPng to OSPFv3

    If its IPv4 do the following to narrow it down:

    From Client 1 ping 10.1.1.1 if its :

    OK? = 3 tickets on R1:
    (T03) Wrong IP of BGP neighbour
    (T04) NAT – ACL mis-configured
    (T05) WAN ACL statement missing

    If you cant ping 10.1.1.1 try to ping 10.1.1.2 from client 1

    OK? = 1 ticket on R1:
    (T01) OSPF Authentication

    If you cant ping 10.1.1.2 try to ping 10.2.1.1 from client 1

    OK? = 2 tickets on R4:
    (T11) Redistribute ospf to eigrp (“to” & -> )
    (T14) EIGRP Passive Interface

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    NO? = 1 ticket on DSW1:
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    (T08) Access port not in VLAN 10
    (T09) Port Channel not allowing VLAN 10,200
    (T07) Port Security

    I also had multiple choice questions and Eigrp and ospf simlets

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  5. Anonymous
    September 22nd, 2016

    Hi, does the ipv4 and ipv6 questions differs?

  6. td
    September 22nd, 2016

    Hi, does the ipv4 and ipv6 questions differs?

  7. Anonymous
    September 24th, 2016

    Anyone can help
    I am going to take exam next week. I want to know is there mention in question like..
    T06 Nat -Acl
    And can we see three questions of ticket before answering first one or second or cant we go back

    ?

  8. sinole
    September 25th, 2016

    For question 1, I now understand why it’s Answer C. From Cisco:

    “You must define the network type on non-broadcast networks in order to avoid configuration of neighbor statements.”

    http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13690-18.html
    last paragraph under “Introduction”

  9. moamen
    September 27th, 2016

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    13 Tickets (As mentioned in this site except TT 2,10,13)
    2 Sim ( Switch Sim 4 Q’s as mentioned here & OSPF Sim 4 Q’s as mentioned here )
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    in this Sim Q1 (C) is the correct answer.

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    October 5th, 2016

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    October 11th, 2016

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  35. @
    January 5th, 2017

    hi @networktut, for this is sim. what is the real answer is B or C? As per your statement, “Although we do believe the answer B “A neighbor statement needs to be configured in R1 and R3 pointing at
    each other” is better but in the exam you should choose answer C.” Should we really choose C in the exam? thanks

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    January 18th, 2017

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  42. netwarrior33
    January 30th, 2017

    Hello to everybody and special for http://www.networktut.com for the nice job you are doing. I like to understand things and seeing all the answers I also came to the idea that B could be a kind of answer but I sending you a link in case you want to review this just to clear some thoughts about if is answer B or c . I will stay with C and the reason you will find it int this video attached (is a video from INE with some sort of explanation that maybe will clear your minds better)
    I agree with the C answer

    https://www.youtube.com/watch?v=Zz7eAv6sHAw

  43. netwarrior33
    January 30th, 2017

    Hi to everybody and special for http://www.networktut.com for the nice job you are doing. I like to understand things and seeing all the answers I also came to the idea that B could be a kind of answer but I sending you a link in case you want to review this just to clear some thoughts about if is answer B or c . I will stay with C and the reason you will find it int this video attached (are videos from INE with some sort of explanation that maybe will clear your minds better)
    I agree with C answer …see videos for explanation . Second video even better to understand why. Minute 20:09 in the second video.

    https://www.youtube.com/watch?v=Zz7eAv6sHAw
    https://www.youtube.com/watch?v=mD-K_tgbyIQ

  44. netwarrior33
    January 30th, 2017

    I agree with C answer …see videos for explanation . Second video even better to understand why. Minute 20:09 in the second video.

    https://www.youtube.com/watch?v=Zz7eAv6sHAw
    https://www.youtube.com/watch?v=mD-K_tgbyIQ

  45. Chimpcat
    February 3rd, 2017

    Agree with @Sinole OSPF Sim – Answer C has some validity, so thanks for providing the link; http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13690-18.html

    Refer to Section – Configurations for NBMA (Use Neighbor Statements)
    Under the Notes you will find this sentence:

    Though configuration of the neighbor statement on one end is sufficient to form adjacency, it is a good practice to have it configured on both the ends as shown.

    Good luck to all.

  46. OSPF Sim Q3
    April 3rd, 2017

    Just to clarify – is C the answer which Cisco want for question 1?

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