OSPF Questions
Here we will find answers to OSPF questions
Question 1
An administrator Pipes in the command router ospf 1 and receives the error message: “OSPF process 1 cannot start.” (Output is omitted.) What should be done to correctly set up OSPF?
A – Ensure that an interface has been configured with an IP address
B – Ensure that an interface has been configured with an IP address and is up
C – Ensure that IP classless is enabled
D – Ensure that the interfaces can ping their directly connected neighbors
Answer: B
Question 2
During a recent OSPF election among three routers. RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of the DR while RTC becomes the new BDR. What will happen when RTA comes back online?
A – RTA will take the place of DR immediately upon establishing its adjacencie
B – RTA will take the place of DR only if RTB fails
C – RTA will take the place of DR only if both RTB and RTC fail
D – A new election will take place establishing an all new DR and BDR based on configured priority levels and MAC addresses
Answer: C
Question 3
Refer to the exhibit. During the process of configuring a virtual link to connect area 2 with the backbone area, the network administrator received this console message on R3:
*Mar 1 00:25:01.084: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0
How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?
A – R1(config-router)# area 1 virtual-link 30.30.30.3
R3(config-router)# area 1 virtual-link 20.20.20.1
B – R1(config-router)# area 1 virtual-link 20.20.20.2
R3(config-router)# area 1 virtual-link 30.30.30.2
C – R1(config-router)# area 0 virtual-link 1.1.1.1
R3(config-router)# area 2 virtual-link 3.3.3.3
D – R1(config-router)# area 1 virtual-link 3.3.3.3
R3(config-router)# area 1 virtual-link 1.1.1.1
E – R1(config-router)# area 1 virtual-link 2.2.2.2
R3(config-router)# area 1 virtual-link 2.2.2.2
Answer: D
Explanation
When designing a multi-area OSPF network, all areas should be connected to the backbone area. However, there may be instances when an area will need to cross another area to reach the backbone area like area 2 in this case. A virtual link has the following two requirements:
+ It must be established between two routers that share a common area and are both ABRs.
+ One of these two routers must be connected to the backbone.
In this case, two routers that satisfy the above requirements are R1 and R3. The syntax for creating a virtual link across an area is:
area area-id virtual-link neighbor-router-id
The area-id is the number of the transit area, in this example Area 1 and neighbor-router-id is the IP address of the highest loopback interface configured or can be manually set on the neighboring router.
Question 4
As shown in the exhibit ,OSPF is configured over a Frame Relay network. All PVCs are active. However, P4S1 and P4S3 fail to see all OSPF routes in their routing tables. The show ip ospf neighbor command executed on P4S2 displays the state of the neighbors. In order to fix the problem , what should be done?
A – The neighbor command should be configured under the OSPF routing process on all routers
B – The ip ospf network broadcast command should be configured on each Frame Relay interface
C – The ip ospf network non-broadcast command should be configured on each Frame Relay interface
D – The ip ospf priority value on the spoke routers should be set to 0
Answer: D
Explanation
In an NBMA network topology, neighbors are not discovered automatically. OSPF tries to elect a DR and a BDR due to the multi-access nature of the network, but the election fails since neighbors are not discovered because NBMA environment doesn’t forward broadcast and multicast packets. Neighbors must be configured manually to overcome these problems.
Also, additional configuration is necessary in a hub and spoke topology to make sure that the hub routers, which have connectivity with every other spoke router, are elected as the DR and BDR. You must set the spoke interfaces to an OSPF priority of zero, this ensures that the spokes will not become the DR or BDR.
Question 5
The following exhibit shows ipv6 route output. What would the metric be for a summary route that summarizes all three OSPFv3 routes displayed?
A – 160
B – 140
C – 120
D – 100
Answer: D
Explanation
The cost of the summarized routes is the highest cost of the routes being summarized. In fact, in the old RFC 1583 standard, the cost of the summary route was the cost of the lowest metric. But when OSPF was updated in RFC 2178 and RFC 2328, the summary route should have the same cost as the highest-cost summarized route. In this case, the highest-cost is 100 according to the second entry.
Question 6
Study the exhibit below carefully. In order to summarize all routes from area 0 to area 1, what must be configured on the router?
A – area 0 range 172.16.96.0 255.255.224.0
B – area 1 range 172.16.96.0 255.255.224.0
C – area 1 range 172.16.96.0 255.255.0.0
D – area 0 range 172.16.96.0 255.255.255.0
Answer: A
I think in question 6 the answer should be B.
Oh, sorry. Answer A is correct, ofcourse.
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!
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VERY GOOD ANSWER
For some reosan this sounds familiar to me wasn’t it designed by the same designer my colleague worked with on certain customer’s network? Seriously, he showed me very similar setup to this. One non-backbone stub area with 4 or so routers (to minimize traffic and processing from OSPF), made as NSSA (to be able to redistribute couple of connected routes to/from BGP). We were all just shaking our heads. I do not remember if he managed to talk him away from this nonsense
Hello,
Question – What are OSPF ABR functions (Choose three)
- flooding Summary LSAs to connected areas?
- flooding ASBR Summary LSAs to connected areas?
- flooding NSSA External LSAs to Area 0?
- performing summarization on routes headed to Area 0?
- Generating all Router LSAs for connected neighbors?
Thanks!
i think first 3 statements are correct
Hi guys,
Is it true we can skip all Frame Relay and NBMA questions?
Q 6 is incorrect
summary address shoulde be
255.255.128.0 coz 01100000 to
01111111
Please correct me if m wrong
Question 6 is correct.
Your summary boundary is established where the bit pattern in your range of network addresses changes. All networks summarized will have the same network portion. In this example the change takes place at the 20th bit, making the first 19 bits the same:
011 00000
011 11111
Therefore 255.255.224.0 is the correct mask for this example.
When a router analyzes the OSPF LSDB to calculate the best route to each subnet for internal
routes, it does the calculations in a specific order. Which answer below puts the calculations in
the correct order of operation?
Choose the best answer.
A. 1. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.
2. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs and
based on any Type 2 network LSAs.
3. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.
B. 1. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs
and based on any Type 2 network LSAs.
2. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.
3. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.
C. 1. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs
and based on any Type 2 network LSAs.
2. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.
3. Runs SPF to find all possible paths through the area’s topology, from itself to each subnet.
D. 1. Runs SPF to find all possible paths through the area’s topology, from itself to each
subnet.
2. Finds all subnets inside the area, based on the stub interfaces listed in the Type 1 LSAs and
based on any Type 2 network LSAs.
3. Calculates the OSPF interface costs for all outgoing interfaces in each route, picking the
lowest total cost route for each subnet as the best route.
what should be answer?? anybody?? pls
@Raj
Answer is C. OSPF router must first analyze its LSDB (find all subnets), calculate its own interface cost using 10^8/bandwidth formulae and then run SPF algorithm to find all possible paths.
@Dejan: Thank you :)
Can somebody please confirm rumors on a different site this hotspot is no longer part of the exam? Thanks.
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@Raj; Dejan
I believe the answer is B. The OSPf process firstly, finds the subnets in its area, then it finds all possible paths from itself to the subnets found before it can determine the best paths by calculating each path together with its interface metric.
Is all the questions on digitaltut is latest….?
For question 3 – how can answer D be correct since router 1and router 3 cannot be neighbors? Isn’t it true that neighbors must have interfaces on the same link? I believe answer E is correct.
For question 3 D is correct. Sorry. When configuring a virtual link you must specify the router ID of the far end router of the transit area. The far end router is the ABR linking the transit area to the area the virtual link is connecting.
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Is the diagram labeled incorrectly in #3 to have area 0 to the left instead of the center ring?
@ all, on question # 2, pls help me on the answer, cause I think it should be A, Ive tried tested this on PT , and after I shut down Router A, as expected Router B and Router C assumes their respective roles. but after you make Router A operational , as soon as it establishes adjacency, it immediately assumes the role of DR. I taught that DR/BDR election is not pre- empted but my tests shows different.
thanks in advance.!
hi, regarding Q#2, I’ve retested it in GNS3 and I must admit that A was not the answer due to inconsistencies on my config. sorry folks, but then indeed “C” was the best answer but take note that if Router B and Router C is down, then no neighbor adjacency will be formed on Router A, so basically Router A is not a DR, since no neighbor is up. thanks,!
@kel
Answer C is correct,
No matter what the IP of the routers are or how many Loopback interface there is, once router A starts it will become the BDR then DR because is the only router. However when the second router comes into play, the B router will be selected as BDR and Router A will be DR because it was the first router on line up. When the C router comes in it will be selected as DROTHER because DR/BDR is already elected and they will not preempt. The election process will not start unless one of the DR/BDR is down. they will have another election which is to replace the BDR. It will not replace the position of the DR because the original BDR will be automatically elected as DR. Until both router B & C is down router A won’t be elected as DR.
Hope this helps
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cleared with 1000/1000.
Exam duration is 2.5 hours, so take your time, think and complete your exam in no hurry.
IP addresses have changed, the option’s order has changed so be patient and careful, while selecting the answer.
The simulators don’t support neither “wr” nor “copy running-config start-config”, except an OSPF sim which is about “stub”.
im sorry but can any one explain q6 for me
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