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?
i’ll give route exam on 15th of july plz send me the latest dumps on bozo.tiger@gmail.com
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?.
Dear all friends,
Please send me Route link on my Id :dilippathak69@yahoo.com
@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