Test: OSPF & OSPF Configuration - Computer Science Engineering (CSE) MCQ

# Test: OSPF & OSPF Configuration - Computer Science Engineering (CSE) MCQ

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## 25 Questions MCQ Test Computer Networks - Test: OSPF & OSPF Configuration

Test: OSPF & OSPF Configuration for Computer Science Engineering (CSE) 2024 is part of Computer Networks preparation. The Test: OSPF & OSPF Configuration questions and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus.The Test: OSPF & OSPF Configuration MCQs are made for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: OSPF & OSPF Configuration below.
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Test: OSPF & OSPF Configuration - Question 1

### Open Shortest Path First (OSPF) is also called as

Detailed Solution for Test: OSPF & OSPF Configuration - Question 1

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.

Test: OSPF & OSPF Configuration - Question 2

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 2

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

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Test: OSPF & OSPF Configuration - Question 3

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 3

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

Test: OSPF & OSPF Configuration - Question 4

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 4

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

Test: OSPF & OSPF Configuration - Question 5

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 5

Test: OSPF & OSPF Configuration - 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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 6

Explanation: None.

Test: OSPF & OSPF Configuration - Question 7

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 7

Explanation: Checksum field is used to detect errors.

Test: OSPF & OSPF Configuration - Question 8

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 8

Explanation: M bit is set to 1.

Test: OSPF & OSPF Configuration - Question 9

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 9

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

Test: OSPF & OSPF Configuration - Question 10

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 10

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

Test: OSPF & OSPF Configuration - 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?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 11

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.

Test: OSPF & OSPF Configuration - 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?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 12

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.

Test: OSPF & OSPF Configuration - 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?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 13

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.

Test: OSPF & OSPF Configuration - Question 14

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 14

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

Test: OSPF & OSPF Configuration - Question 15

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 15

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

Test: OSPF & OSPF Configuration - Question 16

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 16

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

Test: OSPF & OSPF Configuration - Question 17

What is the IP protocol number for OSPF packets?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 17

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

Test: OSPF & OSPF Configuration - Question 18

Which packet is NOT an OSPF packet type?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 18

Explanation: Query packet is NOT an OSPF packet type.

Test: OSPF & OSPF Configuration - Question 19

Which multicast address does the OSPF Hello protocol use?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 19

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

Test: OSPF & OSPF Configuration - Question 20

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 20

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

Test: OSPF & OSPF Configuration - Question 21

DBD packets are involved during which two states?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 21

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

Test: OSPF & OSPF Configuration - Question 22

At which interval does OSPF refresh LSAs?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 22

Explanation: None.

Test: OSPF & OSPF Configuration - Question 23

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

Detailed Solution for Test: OSPF & OSPF Configuration - Question 23

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

*Multiple options can be correct
Test: OSPF & OSPF Configuration - Question 24

Which two commands are required for basic OSPF configuration?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 24

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

Test: OSPF & OSPF Configuration - Question 25

Which OSPF show command describes a list of OSPF adjacencies?

Detailed Solution for Test: OSPF & OSPF Configuration - Question 25

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

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## Computer Networks

21 videos|107 docs|66 tests