Home > CCNA – OSPF Questions 2

CCNA – OSPF Questions 2

April 7th, 2015 Go to comments

Note: If you are not sure about OSPF, please read our OSPF Tutorial.

Question 1

Explanation

A is not correct because configure EIGRP on these routers (with a lower administrative distance) will force these routers to run EIGRP, not OSPF.

B is not correct because the backbone area of OSPF is always Area 0.

C and D are correct because these entries must match on neighboring routers:

Hello and dead intervals
Area ID (Area 0 in this case)
– Authentication password
– Stub area flag

Question 2

Explanation

The well-known formula to calculate OSPF cost is

Cost = 108 / Bandwidth

so B is the correct answer.

Question 3

Explanation

D is correct because these entries must match on neighboring routers:

Hello and dead intervals
Area ID (Area 0 in this case)
– Authentication password
– Stub area flag

In this case Ethernet0 of R1 has Hello and Dead Intervals of 5 and 20 while R2 has Hello and Dead Intervals of 10 and 40 -> R1 and R2 cannot form OSPF neighbor relationship.

Question 4

Question 5

Question 6

Explanation

To form an adjacency (become neighbor), router A & B must have the same Hello interval, Dead interval and AREA number.

Question 7

Explanation

OSPF LSA Type 1 (or Router LSA) is generated by all routers in an area to describe their directly attached links. An example below shows this type of LSA:

show_ip_ospf_database.jpg

As you can see, the LSA Type 1 uses the router ID to advertise itself (1.1.1.1 or 2.2.2.2).

The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence:
+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
+ The router ID can be manually assigned

Question 8

Explanation

From the output of the “show ip ospf database”:

show_ip_ospf_database.jpg

We can see OSPF Router ID will be used as source of Type 1 LSA (1.1.1.1 & 2.2.2.2). Also the router will chose the highest loopback interface as its OSPF router ID (if available).

Question 9

Question 10

Explanation

The ‘network … area …’ command under OSPF process has the following meaning: It searches all the active interfaces, if the IP address of that interface belong to the ‘network …’ configured under OSPF process then the router will run OSPF on that interface. Therefore when we configure ‘network 0.0.0.0 255.255.255.255 area 0’ command, all interfaces are matched -> OSPF is enabled on all active interfaces on the router.

Comments (27) Comments
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  1. Hope
    February 26th, 2016

    Hello Everyone. I am taking my exam next week. Can someone please send me the latest dumps for 200-120 to {email not allowed}

  2. Anonymous
    March 3rd, 2016

    are these questions valid yet ?

  3. VG
    March 10th, 2016

    hi one doubt on question 1 R3 is already on the circle of backbone area 0 on the picture right ? then how will C will be correct ?

  4. Vasily
    March 20th, 2016

    Q1 how we can know about all this staff?

  5. pk
    March 28th, 2016

    hello admin…. im wonna write CCNA xam on april 2.so will u plz guide me for practicle session…?????

  6. pk
    March 28th, 2016

    i need vry imp practicle questions will u plzz suggest me…

  7. bil
    April 5th, 2016

    Hello Everyone. I am taking my ccna exam next week. Can someone please send me the latest dumps for 200-120 to {email not allowed}

  8. Ritu
    April 15th, 2016

    Ques: 6’s Answer is incorrect
    It should be A

  9. kotomoto
    April 25th, 2016

    VG..q1.
    C is correct..as is apparent all routers (should) be configured to area 0.. now look at the answers A is totally incorrect because we are talking about OSPF not EIGRP. answer B also is incorrect because it mentioned a different area (1)..so we have to chose the last two answers by default.. although we couldn’t access the configuration then we have to guess that R3 have been configured in different areas.

  10. kotomoto
    April 25th, 2016

    Ritu.. Q 6..

    A is not correct, there is no problem if the looback interfaces are in different subnets, actually they are in different routers and each router has its won network. check OSPF Tutorial in 9tut to see that.

  11. Mo
    April 30th, 2016

    Where are the Question ?

    This link from 9tut.com (http://www.mediafire.com/download/q5dbz8mpn12j45n/CCNAquestions_Mar_2016.pdf)

    does not match up with above questions, refers to the CCNA- OSPF Questions in the above link

    or am i looking at the wrong link…

    Can somebody please clarify ….

  12. suresh
    May 2nd, 2016

    I am planning to write exam this week,PLZ any one send me the latest dumps – 200-120

  13. Paul
    May 25th, 2016

    Please could some one send me the latest dumps, {email not allowed}. Cheers

  14. Anonymous
    May 29th, 2016

    Hello all, I am taking my ccna 200-120 exam in next two weeks. I need proper labs and dumps for that can anyone e-mail me on {email not allowed}.

  15. maldito
    May 29th, 2016

    Buen dia para todos,

    Los vertederos siguen siendo igual? acl1- acl2-ospf-?

  16. Anonymous
    June 7th, 2016
  17. Ted
    June 30th, 2016

    Hello
    Has anyone had this question in the exam? I am asking as I have seen the answer be ‘ 4 ‘ and I have seen the answer being ‘ 8 ‘ in different dumps. I also saw depends on the IOS, was wanting to know if on the exam what is the correct answer in the exam
    What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

  18. Mohd Taleb
    July 10th, 2016

    pls .. can someone explains Q9: what is the virtual links??

  19. Anonymous
    July 13th, 2016

    Is CCNA 200-120 Syllabus going to change by next month 20th..? Kindly give me the info..

    Thanks in Advance..

  20. £
    July 16th, 2016

    last day to take current exam August 20th. check Cisco website for new subjects
    probably won’t be updated dumps for awhile i would guess

  21. Anonymous
    July 18th, 2016

    By default max number of equal paths in ospf is 4. This can however be increased to 16. The keyword here is DEFAULT.

  22. mat
    July 19th, 2016

    Hi. I am taking my exam next week. Can someone please send me the latest dumps for 200-120 to moojtaba_alirezaei @ yahoo . com
    tnx

  23. Ted
    July 21st, 2016

    Anonymous ,

    Did you get the default number of OSPF equal cost paths in your exam?
    I am asking as some dumps the answer is 4, some it is 8 , apparently depends on the
    IOS version. I am hoping if I have this question in the exam with the choices for the answer, there is an option for 4 OR 8 ONLY, then I can choose the available choice….

  24. fossible CCNA
    August 19th, 2016

    Will http://www.fossible.net support ccna ?

  25. Anna
    September 12th, 2016

    Hi..OSPF is really the main topic of routing part in CCNA I think…
    Here is a related link…
    http://ipcisco.com/ospf-area-types-on-packet-tracer-part-1/

  26. Miral
    December 14th, 2016

    How does lsa knows where to send the packet?

  27. kiki
    January 10th, 2017

    Can anyone send me latest dumps to {email not allowed}
    Thanks.

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