642-902 Q&A – Implement a multi-area OSPF Network (11-15)

Section 2 – Implement a multi-area OSPF Network, given a network design and a set of requirements

QUESTION NO: 11
Given the following partial configuration for Router A:

interface serial 0
ip address 10.1.1.1 255.255.255.0
ip ospf network point-to-multipoint
router ospf 7
network 10.1.1.0 0.0.0.255 area 0

Which two statements are correct? (Choose two.)

A. DR/BDR elections do not take place.
B. The area 0 NBMA cloud is configured as more than one subnet.
C. The router is restricted to a hub and spoke topology.
D. OSPF neighbor statement are not necessary.
Answer: A,D

QUESTION NO: 12
Refer to the exhibit. OSPF has been configured on all routers in the network. However, router R1 does not receive a default route to router R2 as intended. Which configuration change would ensure that R1 would receive a default route from R2? Select the best response.

image
A. Add the area 1 stub command on routers R1.
B. Add the always keyword to the default-information originate configuration command on router R2.
C. Remove the default information originate configuration command from router R2 and place it on router R1.
D. Add the ip route 5.0.0.0 255.255.255.0 0.0.0.0 command to router R2.
Answer: B
Explanation:
The point of this question is about advertise a default route into an ospf area.
There are two ways to advertise a default route into an ospf areA. The first is to advertise 0.0.0.0 into the OSPF domain, provided the advertising router already has a default route. The second is to advertise 0.0.0.0 regardless of whether the advertising router already has a default route. The second method can be accomplished by adding the keyword always to the default-information originate command. In this example, the “always” keyword would be required in order to propagate this default route.

QUESTION NO: 13
Refer to the partial configurations in the exhibit. What address is utilized for DR and BDR identification on Router1? Select the best response.

image
A. the serial 1/1 address
B. the serial 2/0 address
C. a randomly generated internal address
D. the configured router-id address
Answer: D
Explanation:
The point of this question is DR and BDR election of OSPFv3.
OSPF test the title of the DR and BDR election.
DR and BDR election there are two standards:
1. Interface priority, the default is 1.
2. Router-id: manually specify> Highest loopback interface> Highest active IP address
This title, there is no priority list, it is the default, manually specify the Router-id: 10.1.1.3, so hand-Router-id specified in the election has become the standard DR and BDR.
The selection of DR and BDR is the same between OSPFv2 and OSPFv3.

QUESTION NO: 14
When verifying the OSPF link state database, which type of LSAs should you expect to see within the different OSPF area types? (Choose three.) Select 3 response(s).
A. All OSPF routers in stubby areas can have type 3 LSAs in their database.
B. All OSPF routers in stubby areas can have type 7 LSAs in their database.
C. All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
D. All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
E. All OSPF routers in NSSA areas can have type 3 LSAs in their database.
F. All OSPF routers in NSSA areas can have type 7 LSAs in their database.
Answer: A,E,F

QUESTION NO: 15
Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed?
A. show ip protocol
B. show ip ospf
C. show ip ospf database
D. show ip ospf interface
Answer: B

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