Test: OSPF And OSPF Configuration


25 Questions MCQ Test Computer Networks - Notes, Videos, MCQs & PPTs | Test: OSPF And OSPF Configuration


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QUESTION: 1

Open Shortest Path First (OSPF) is also called as

Solution:

Answer: a
Explanation: Each OSPF router monitors the cost of the link to each of its neighbours and then floods the link state information to other routers in the network. hence it is called so.

QUESTION: 2

The computation of the shortest path in OSPF is usually done by

Solution:

Answer: c
Explanation: Shortest path in OSPF is usually computed by Dijkstra’s algorithm.

QUESTION: 3

Which of the following is false with respect to the features of OSPF

Solution:

Answer: a
Explanation: Support for variable-length sunbathing by including the subnet mask in the routing message.

QUESTION: 4

 In OSPF, which protocol is used to discover neighbour routers automatically?

Solution:

Answer: d
Explanation: Hello protocol is used to discover neighbour routers automatically.

QUESTION: 5

Which of the following is not a type of OSPF packet?

Solution:

Answer: c
Explanation: Five types of OSPF packets are: Hello, Database description, Link-state request, Link-state update, Link-state ACK

QUESTION: 6

Correct order of the operations of OSPF
1. Hello packets
2. Propagation of link-state information and building of routing tables
3. Establishing adjacencies and synchronisation database

Solution:

Answer: b
Explanation: None.

QUESTION: 7

In OSPF header, which field is used to detect errors in the packet?

Solution:

Answer: c
Explanation: Checksum field is used to detect errors.

QUESTION: 8

In OSPF database descriptor packet, if more database descriptor packet flows, ‘M’ field is set to

Solution:

Answer: a
Explanation: M bit is set to 1.

QUESTION: 9

 In OSPF database descriptor packet, which field is used to indicate that the router is master

Solution:

Answer: b
Explanation: MS bit is set if the router is master, otherwise slave.

QUESTION: 10

In OSPF database descriptor packet, which field is used to detect a missing packet

Solution:

Answer: c
Explanation: Sequence number field is used to detect a missing packet.

QUESTION: 11

An OSPF router receives an LSA, the router checks its sequence number, and thisnumber matches the sequence number of the LSA that the receiving router already has.What does the receiving router do with the LSA?

Solution:

Answer: a
Explanation: An OSPF router receives an LSA, the router checks its sequence number, and this number matches the sequence number of the LSA that the receiving router already has Ignores the LSA.

QUESTION: 12

An OSPF router receives an LSA. The router checks its sequence number and finds thatthis number is higher than the sequence number it already has. Which two tasks doesthe router perform with the LSA?

Solution:

Answer: b
Explanation: An OSPF router receives an LSA. The router checks its sequence number and finds that this number is higher than the sequence number Adds it to the database, Floods the LSA to the other routers.

QUESTION: 13

 An OSPF router receives an LSA. The router checks its sequence number and finds thatthis number is lower than the sequence number it already has. What does the router dowith the LSA?

Solution:

Answer: c
Explanation: An OSPF router receives an LSA. The router checks its sequence number and finds that this number is lower than the sequence number sends newer LSU update to source router.

QUESTION: 14

Each LSA has its own age timer. By default, how long does an LSA wait before requiring an update?

Solution:

Answer: c
Explanation: Each LSA has its own age timer. By default, 30 minutes does an LSA wait before requiring an update.

QUESTION: 15

Distance vector protocols use the concept of split horizon, but link-state routing protocols, such as OSPF, do not. 

Solution:

Answer: b
Explanation: Distance vector protocols use the concept of split horizon, but link-state routing protocols, such as OSPF, do not use this.

QUESTION: 16

The outcome of Dijkstra’s calculation is used to populate the __________

Solution:

Answer: b
Explanation: The outcome of Dijkstra’s calculation is used to populate the Routing table

QUESTION: 17

What is the IP protocol number for OSPF packets?

Solution:

Answer: a
Explanation: 89 is the IP protocol number for OSPF packets.

QUESTION: 18

Which packet is NOT an OSPF packet type?

Solution:

Answer: d
Explanation: Query packet is NOT an OSPF packet type.

QUESTION: 19

Which multicast address does the OSPF Hello protocol use?

Solution:

Answer: a
Explanation: 224.0.0.5 is the multicast address does the OSPF Hello protocol use.

QUESTION: 20

The Hello protocol sends periodic updates to ensure that a neighbor relationship is maintained between adjacent routers.

Solution:

Answer: a
Explanation: The Hello protocol sends periodic updates to ensure that a neighbor relationship is maintained between adjacent routers.

QUESTION: 21

DBD packets are involved during which two states?

Solution:

Answer: a
Explanation: DBD packets are involved during which two states Exstart, Exchange.

QUESTION: 22

At which interval does OSPF refresh LSAs?

Solution:

Answer: d
Explanation: None.

QUESTION: 23

Which field is NOT a field within an OSPF packet header?

Solution:

Answer: d
Explanation: Maxage timeis NOT a field within an OSPF packet header.

*Multiple options can be correct
QUESTION: 24

Which two commands are required for basic OSPF configuration?

Solution:

Answer: b, c
Explanation: Network ip-address wildcard-mask area area-id, Router ospf process-id are required for basic OSPF configuration.

QUESTION: 25

 Which OSPF show command describes a list of OSPF adjacencies?

Solution:

Answer: d
Explanation: Show ipospf neighborOSPF show command describes a list of OSPF adjacencies.

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