OSPF Hotspot
Here you will find answers to OSPF Hotspot Questions
Question
The company and the company network have both been growing rapidly. Multiple adds, moves and changes have been applied to the network. Your boss has asked you to troubleshoot a recent OSPF synchronization problem that has arisen. There have been synchronization problems at separate locations in the OSPF area 0. There have been reported link failures during the rapid growth of the company network. You are required to resolve the OSPF problem. OSPF must be able to converge when the network changes.
Refer to the information above to answer the following 4 questions:
Question 1
Examine the following excerpt from the “show ip ospf” command on D1:
| Area BACKBONE (0) Number of interfaces in the this area is 1 Area has no authentication SPF algorithm last executed 00:00:31.280 ago SPF algorithm executed 5 times Area ranges are Number of LSA 13. Checksum Sum 0x16F0FD Number of opaque link LSA 0. Checksum Sum 0×000000 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 Area 16 Number of interfaces in this area is 2 Area has message digest authentication SPF algorithm last executed 00:00:34.928 ago SPF algorithm executed 7 times Area ranges are Number of LSA 5. Checksum Sum 0x02FCD3 Number of opaque link LSA 0. Checksum Sum 0×000000 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 |
Based on the information shown above, what is most likely causing the different missing routes throughout the network?
A. Area 16 is configured with authentication.
B. Area 16 has been configured to use the same interfaces as Area 0.
C. Area 0 and Area 32 have been configured with mismatched LSA numbers.
D. Area 16 has been configured as a total stub network
E. Area 16 has been configured as a stub network
F. Area 0 is discontiguous.
G. None of the above
Answer: F
Explanation
From the topology, we see D1 has 2 interfaces belong to Area 0, that are interfaces Fa0/1 & Fa0/2 but the output says there is only one interface in Area 0 (Number of interfaces in the this area is 1). Therefore we can deduce that a link in area 0 was down and area 0 is discontiguous.
Question 2
Which configuration command on D1 (with a similar command on D2) will provide an immediate solution to the missing route problem?
A. no area 16 stub
B. no area 16 authentication message-digest
C. area 16 virtual-link 8.187.175.82
D. area 16 virtual-link 172.16.4.2
E. no area 16 stub no-summary
F. network 172.16.0.0.0.0.255.255 area 16
G. None of the above
Answer: C
Explanation
To fix this problem immediately without changing the topology we need to create virtual link between D1 & D2. If you are still confused how to use the virtual link, check out the IPv6 OSPF Virtual Link Sim article.
Question 3
The log of d1 reports the following:
| %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down %OSPF-5-ADJCHG: Process 1, Nbr 8.187.175.82/32 on FasstEthernet0/1 from FULL to DOWN, Neighbor Down: Interface down or detached |
This event was anticipated due to maintenance; however, it resulted in excessive lost routes. Which route should be the only one removed from the routing tables of the routers?
A. 8.187.175.82/32
B. 10.138.43.0/30
C. 10.206.180.0/30
D. 4.249.113.59/32
E. 10.201.0.0/30
F. None of the above
Answer: E
Explanation
From the log we learn that the link of Interface Fa0/1 has been down. This link belongs to network 10.201.0.0/30 so we just need to remove this route from the routing table.
Question 4
The R2 router has lost connectivity to R1. The following is R1′s current route table:
| 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks O IA 172.16.230.0/24 [110/21] via 10.138.43.1, 00:00:03, FastEthernet0/0 O IA 172.16.209.0/24 [110/22] via 10.138.43.1, 00:00:03, FastEthernet0/0 O IA 172.16.1.0/30 [110/21] via 10.138.43.1, 00:00:03, FastEthernet0/0 10.0.0.0/30 is subnetted, 1 subnets C 10.138.43.0 is directly connected, FastEthernet0/0 |
Which expected route is missing from R1′s route table based on the topology during the maintenance period?’
A. o 172.16.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0
B. o IA 9.152.105.122 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
C. o IA 10.138.0.0 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
D. o IA 10.249.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0
E. o IA 4.249.113.59 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0
F. o 8.187.175.82 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
G. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
H. O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
Answer: G
Explanation
In the past, I used to choose answer F as the correct answer but the explanation from DOX3003 (commented on November 19th, 2010) seems to be correct:
“Which expected route is missing from R1′s route table based on the topology during the maintenance period?
X…….
X. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
X. O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
X…….
You can see there are 2 options for the network between D2 and R2. One with “IA” and one without. O – OSPF, IA – OSPF inter area.
Before link failures between D1 and D2 the network 10.206.180.0/30 has been appearing as “intra area” network in R1′s routing table.
Because they were in the same Area 0.
So the correct answer should be
X. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0″”
kindly , confirm if that exam is valid or chenged
kindly , confirm if that exam is valid or changed
my email is : syd_hn@yahoo.com
are there no comments in here because this question is not on the exam anymore or what?
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The answer for Question 4 is the loopback Interface of D2.
During Maintenance period means they have catered that OSPF Area 0 will be dis contiguous hence one needs to assume that Virtual Link is created.
@all: I updated the answer of Question 4 based on DOX3003. Thanks for all!
looks like we have to areas called 0
can we even have that in a design ?
ty
looks like we have two areas called 0
can we even have that in a design ?
ty
@Assem: yes it possible. I didn’t know this tip but I configured it on GNS and I saw the result. another way is tunnel which we can use for solving this problem, anyway in this question our duty is memorizing the answer :D
Guys is 642-902 exam updated recently?
Thanks!
In the last question, why is the option: “F. o 8.187.175.82 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0″, not the correct one. I think both F and G are correct?.
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@guru o 8.187.175.82 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0 is not an advertised route into the ospf procesds. this is configured to be used as the router-id. Please correct me if wrong….
hey guys i have an exam on 2nd NOV KINDLY tell me that is this exam still valid or it has been changed. and link to new exms if possible cheers…… my e-mail is amy_911@live.com.
In question number 2nd is doubtful ,If the router/switch D1 already have one interface in area 0 why do we need virtual-link?I think the answer should be B
Will this hotspot come out in exam? Seems like there are different opinion for the answer, who has the correct answer?
i pass 965 scores yestoday, 4 labs:EIGRP OSPF Redistribution- Policy Based Routing -OSPF -IPv6 OSPF Virtual Link,no OSPF Hotspot question
very good!
Q4 according to test-king (updated Nov4th) answer F is right. There is no even options
given
O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
for q 2,i dont understand why we need virtual link here,when area 16 is directly connected to area 0.as per my understanding,we need virtual link when an area is not directly connected to area 0.please someone explain.thanks
I think answer F is correct because if link from R2 to R1 down means that D2 would not advertise the subnet 10.206.180.2/30 to anyother routers. So you are not expected to see them anyway on the router R1. So only missing subnet is the D2 loopback. Isnt it ?..
Could some one confirm if options below are present in the actual exam?
O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
Hello…! Digitaltut,
Have we no Tutorial like CCNA? If, you have pl.. tell me were I see link of this. It’s help to me claer.
Thank you.
Can some one confirm the answer for question 4 at present please
Can someone tell why in question #3 the answere is not option: C. 10.206.180.0/30, because we are losing that address from D1 routing table.
I think the answer to question 1 is A (reason; area 16 has authention MD5)
I think the answer to question 2 is B ( reason: authentication needs to be removed)
Virtual link not needed because area 16 is directly connected to area..
Hi Guys,
Which three statements accurately describe the result of applying the exhibited route map? (Choose three.)
router eigrp 1
redistribute ospf 1 route-map ospf-to-eigrp
default-metric 20000 2000 255 1 1500
!— Output suppressed.
!
route-map ospf-to-eigrp deny 10
match tag 6
match route-type external type-2
!
route-map ospf-to-eigrp permit 20
match ip address prefix-list pfx
set metric 40000 1000 255 1 1500
!
route-map ospf-to-eigrp permit 30
set tag 8
!
The ans given are:
B. All routes that do no match clauses 10 and 20 of the route map are redistributed with their tags set to 8.
D. The map permits the redistribution of all type 1 external OSPF routes.
F. The map prohibits the redistribution of all type 2 external OSPF routes with tag 6 set.
Why is “E. The map redistributes into EIGRP all routes that match the pfx prefix list and the five metric values?0000, 1000, 255, 1, and 1500.” – Not the Answer ? I know that
the last route-map (30) will set all other routes that do not already match 10 or 20 with a tag of 8.
But have a look at this –
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008047915d.shtml
It says “E. The map redistributes into EIGRP all routes that match the pfx prefix list and the five metric values?0000, 1000, 255, 1, and 1500.” is one of the answer.
Correct me if i am wrong?
Thx.
@JS
The option E clearly shows the manipulation of the statement given here and that shown in the link that u have mentioned.
In the link there is a comma and it says with five metric value
But in the option it says match pfx list and metric value which is wrong because ur setting the metric value and not mactching it.
its like they are playing with the words… :)
SO option E is not correct.
Hope this clears ur doubt
Thank you, COOL for clarifying. Bugger me.
I should have been more careful with the tricky wordings of the answers.
Very tricky.
kindly , confirm if that exam is valid or chenged
i have exam
is this exam till valid tilldate
I doubt the answer for q3. Won’t the route 10.201.0.0 appear as a connected route in the routing table,,, I think the answer should be 10.206.180.0…
Hello Friends,
I just started to study the ROUTE test after taking almost two years off from passing the CCNA. I am planning to take the ROUTE test in two months. Are the Sims, Drag and Drop, Questions, and everything else on this site still valid for the ROUTE test?
Thank you all!
Please share latest dump at sanjeevkumargirdhar@gmail.com
Please is this dump still valid? i’m to take exams in 2 weeks….i’ll highly appreciate if anyone can send me a link.
Thanks
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Regards
Q4:
via is the next hop right ? Why is all routing on R1 pointing to its own interface address?
Hi guys,
this is what I think we need virtual linik in question no2.
You do have only 2 areas, but if you look closer you will see that if fa0/0 on D1 goes down than you will have no connection between 10.138.43.0/30 and 10.206.180.0/30. So there is no connection between two Area0 networks.
To correct that you will create virtual link betwee two area 0 over area 16:
Area 0 —- Area 16 —- Area 0.
I hope this helps :)
I atalculy passed the Written the day after you took it. I agree that some of the questions were in the WTF realm, but I didn’t feel like any of the questions didn’t provide the information needed to answer it, it was just a little tough sometime figuring out what they were getting at.I do recommend the Boson MaxSim product, it was pretty good. And if you have a copy of the CCIE R&S Cert guide from odom, use the code provided to unlock the boson exam for that text. Those questions are *excellent*. They’re hard because almost all of them are choose all that apply’, and they don’t tell you how many apply, so you have to evaluate every single answer for whether or not it’s correct. This helped me greatly when it came to evaluating the questions the actual Written threw at me. Between the Odom book questions, and the Boson questions, I felt it was very representative of the actual exam, but only if you take the time to figure out why you missed the questions you missed.
Hi guys,
I am going to write this paper in march end. Anyone please conform me if the dumps are still valid.
Thanks
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am writing ccnp route next week. can someone please send the latest dump(pdf format please or any other format) to my email yenkataiwo@gmail.com
thanks in advance
for Q 2)
all ospf routers in an area must have the same LSDB. since D1 and d2 are connected (in area 0) they will not share their LSU with each other, thats the reason we need a virtual link.
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what i dont get is that the link in area 0 between D1 y D2 is treated like its not there , they shouldve meintioned that link was not going to be used again.
Verified today on GNS3, question #4 ANSWER:
G. O 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
IS CORRECT – with virtual-link in area 16 between D1 and D2 this route is marked as “O” in “sh ip route” output
except next-hop IP address – it should be 10.138.43.2, D1′s Fa0/2 address
Hi guyz,
Can anyone tell me what D1/D2 are ?
D1—to —D2 got two links one thru area 0 and one thru area 16 right !–the link thru area 16 got SAME ip address of 172.16.1.1/30 ( how that works–typo ?) on D1/D2′s interface F0/24. Even so, If that link between D1–to–D2 thru area 0 is down, dont we still have both the area connected thru ( R1–D1–area 16—D2—R2 ) area 16 !
Please help me understand ! Thank you everone.
Hi,
Just to add to my last post on the link between D1—area 16—D2. If the picture is right and lets say its a technical mistake becoz of upgrade/maintance, then that link would be down as well ! And thats when area 0 and area 16 wud be seperated ( considering the the link thru 10 is already down as described earlier. If this is the true picture —why wud D1 have 2 interfaces in area 16 as per—”excerpt from the “show ip ospf” command on D1 “. I cud only see Fa0/10 active. Fa0/24 on D1 wud be down becoz of mismatch ip.
And also
“” The R2 router has lost connectivity to R1. The following is R1′s current route table:
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
O IA 172.16.230.0/24 [110/21] via 10.138.43.1, 00:00:03, FastEthernet0/0
O IA 172.16.209.0/24 [110/22] via 10.138.43.1, 00:00:03, FastEthernet0/0–>Where this come from!!.
O IA 172.16.1.0/30 [110/21] via 10.138.43.1, 00:00:03, FastEthernet0/0—This network wud be down as per “IP Mismatch”( If the Picture is right ). Shudnt show up then!!
10.0.0.0/30 is subnetted, 1 subnets
C 10.138.43.0 is directly connected, FastEthernet0/0 “”
I got stuck on this big time–so any insight wud be greatly appriciated. Once again thanks for amazing effort put into this site !
Preparing for route exam has anyone got the latest dump that I can practice please send to mohbah101@gmail.com
Also can anyone please confirm whether this labsims are still valid…
Thanks for everyone effort
Long live 9tut!!!!!
Can somebody please confirm one way or the other if this hotspot is still part of the exam? I’ve heard rumors on another site that it is NO LONGER PART OF THE EXAM. Again, can somebody confirm it is or is not part of the exam? Thanks.
i have booked for the 25 July. i hope to pass.
Passed with a 970. This hotspot was not included in my exam.
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Hi guys,
I passed my route exam yesterday with 988 score. The labs are same as above, except please enter distance eigrp 90 105 on Router R2 in OSPF and EIGRP Redistribution lab so that route can pass through R>R2>R3>R4.
Also note, there are three GRE questions .. which I was suprised to see..
I honestly recommend you to go through the CBT nuggets, practise labs on GSN3.
Do the digital tut labs, actual tests questions and wheel man dumps and give a shot at exam. Trust me you will be fine.
For me I practised 2-4 hrs everyday for nearly two months and this helped me pass the exam.
Good luck for all new exam takers
Yoman
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Hi!
Question 3
Which route should be the only one removed from the routing tables of the routers?
A. 8.187.175.82/32
B. 10.138.43.0/30
C. 10.206.180.0/30
D. 4.249.113.59/32
E. 10.201.0.0/30
F. None of the above
Answer is E, but now Area 0 is discont. and route 10.206.180.0/30 (C) also wil be removed from OSPF!
Shamik,
D1 know the 10.206.180.0/30 via 2 way. Intra Area (Area0) & Inter Area (Area 16).
Area 0 learned route lost due to maintenance. Second best choosed.
Selection criteria.
1.Intra Area
2.Inter Area
3.External E1
4.External E2
Q 4 explanation have a confusing route
X. O IA 10.206.180.0/30 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0
if we are discussing given topology , how it would be O IA at R1.
R1 and R2 are in same area 0.
If we don’t have any connectivity between D1 and D2 on area 0.
f0/1 is down and no virtual links as well
We wont receive any of 10.206.180.0 route.
Although the best answer is G.
As for Q4, the topology doesn’t state which area the loopback interfaces are in, so you can rule out E and F. There’s simply no way to tell from the topology whether they should be intra or inter-area routes. In fact, we don’t even have reason to believe that loopbacks on D1 and D2 are being advertised through OSPF; they could simply be router-ids.
Since we can safely rule out A – D, that leaves us with G and H. Since 10.206.180.0/30 is in the same area as R1′s F0/0 interface, we know that it would be an intra-area route, so we can rule out H, thus leaving G as the only possible answer.
Remember that all the question is asking is what route is missing from R1 based on the known topology. If everything were working (i.e., D1′s f0/1 interface were up), O 10.206.180.0/30 is the only route from the routing table missing.
I’m confused what the correct answer on these questions?!! there are many possibilities
Hi please some one tell how many papers are there in CCNP..What is the exam fee..?
@Dhina: Please read it here: http://www.digitaltut.com/route-faqs-tips
Q1, Why is A not correct ?
The excerpt below.
“Area 16
Number of interfaces in this area is 2
Area has message digest authentication”
@Rafi,
because the question is not “What the output states”, but “What is most likely causing the issue”.
I am not clear on Q2. Why do we need a virtual link when the two areas are connected? R1 and R2 can still communicate and keep their updates thru 172.16.1.0 network. What am I missing here? Anyone, please clarify for me. Thank you.
does this question still appear in the exams? Pliz those who have done the exams this month, answer back.
@Mumin Q6
Your explanation helps me to understand the meaning of the question. In my opinion the question is not clearly formulated.
None of the above were on my exam today.
Hello guys, the information that is in the yellow boxes in each question are to be found inside the routers with console commands or find the info directly in a box in the question?
thanks a lot
Hi All,
I took the exam last week with max score.
Not this OSPF Hotspot, not EIGRP Simlet.
The other 5 configuration labs are present in the exam and valid.
Don’t worry if you can’t do a ‘copy run start’ in the real exam (type it and good).
Ip addresses, names, areas and processes can change!
Don’t type blind!!! Know the concept and the commands!!!
And you are on the safe side.
Thanks digitaltut, Boyi n Peter (All question from these only).
I hope the test wont be changed anytime soon as what happened with ccna
type : PDF
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update date 15 MAR
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and dont Forg8 5 labs
1-OSPF EIGRP Redistribute Lab
2-OSPF Sim
3-IPv6 OSPF Virtual Link Sim
4-EIGRP Simleter
5-Policy Based Routing Sim
for Lab
Yes it is an valid exam :)
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