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Random questions about OSPF

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Random OSPF fun time.

Question 1 of 19

1

Which LSA sends out information about known networks in an area?

Select one of the following:

  • Type 1 Router LSA

  • Type 2 Network LSA

  • Type 3 Summary LSA

  • Type 4 ASBR Summary LSA

  • Type 5 Autonomous system external LSA

  • Type 7 NSSA LSA

Explanation

Question 2 of 19

1

What option matches the type 2 LSA?

Select one of the following:

  • The type 2 LSA is used for DR/BDR to let them know which routers belong to the multi-access network.

  • The type 2 LSA is used to propagate the "tree" for each router in an area.

  • The type 2 LSA is only used in PPP-network types when DR and BDR is not used.

  • The type 2 LSA is used by the DR/BDR to tell the other routers in a segment which prefix they belong to and who the DR/BDR are.

Explanation

Question 3 of 19

1

What characteristics corresponds with the type 3 LSA?

Select one or more of the following:

  • Type 3 LSA is only propagated inside an area.

  • Type 3 LSA's are created from internal routers.

  • Type 3 LSA's needs an ASBR.

  • Type 3 LSA's needs an ABR.

  • Type 3 LSA's is only propagated between areas.

Explanation

Question 4 of 19

1

The type 4 LSA contains information about?

Select one of the following:

  • The router ID of the DR.

  • How to reach the ABR.

  • How to reach a specific area.

  • How to reach the ASBR.

Explanation

Question 5 of 19

1

What routes-type sends out type 5 LSA for what purpose?

Select one of the following:

  • ASBR sends out type 5 LSA to let other areas know how to reach it.

  • ASBR sends out type 5 LSA with summary information between areas.

  • ABR sends out type 5 LSA with external summary information between areas.

  • DR sends out type 5 LSA to propagate the multi-access segment with prefixes to other networks.

  • ASBR sends out type 5 LSA with summary information to other networks outside the OSPF-domain.

Explanation

Question 6 of 19

1

What is the purpose of the type 7 LSA?

Select one of the following:

  • The type 7 LSA is used to propagate redistributed networks into Not-so-stubby-areas.

  • The type 7 LSA is used instead of type 3 LSA's that are blocked in totally stubby areas.

  • The type 7 LSA is exactly the same as the type 5 LSA.

  • The type 7 LSA carries information about external networks.

Explanation

Question 7 of 19

1

Stub areas allow type 5 LSA's.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 19

1

Stub areas allow type 3 LSA.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 19

1

The AS summary LSA is created by the?

Select one of the following:

  • DR

  • ABR

  • ASBR

  • Backbone Router

Explanation

Question 10 of 19

1

What is the type 8 LSA called?

Select one of the following:

  • Link LSA

  • Intra-area prefix LSA

  • Inter-area prefix LSA

  • Link-local LSA

Explanation

Question 11 of 19

1

The type 9 LSA is used for what?

Select one of the following:

  • The intra-area prefix LSA is the same as the type 1 and 2 LSA in OSPFv2.

  • The inter-area prefix LSA is the same as the type 1 and 2 LSA in OSPFv2.

  • The intra-area prefix is used to summarize networks between areas.

  • The inter-area prefix is used to summarize networks between areas.

Explanation

Question 12 of 19

1

Which LSA types are renamed in OSPFv3?

Select one or more of the following:

  • Router LSA

  • Summary LSA

  • Network LSA

  • ASBR summary LSA

  • AS LSA

  • Type 7 LSA

Explanation

Question 13 of 19

1

OSPFv3 supports only IPv4

Select one of the following:

  • True
  • False

Explanation

Question 14 of 19

1

OSPF supports what types of authentication?

Select one or more of the following:

  • MD5

  • Plain text

  • SHA

  • Timed based MD5

  • Shared secret

Explanation

Question 15 of 19

1

Virtual link can be configured over stub areas.

Select one of the following:

  • True
  • False

Explanation

Question 16 of 19

1

To configure route summarization in OSPF, which command is used?

Select one of the following:

  • Area range

  • Summary-address

  • default-information originate

  • Auto-summary enable

Explanation

Question 17 of 19

1

How do you inject a default-route into OSPF?

Select one of the following:

  • Use the default-route command in router-configuration mode.

  • Create a static default-route and use the redistribute command.

  • Use the default-information originate command.

  • Use the default-information originate always command.

Explanation

Question 18 of 19

1

Where is priority used in OSPF?

Select one of the following:

  • In the election of master and slave when database description packets are exchanged.

  • The calculation of shortest path.

  • The election of DR and BDR

  • In the creation of stub areas where priority 0 is used to flag an area as stub.

Explanation

Question 19 of 19

1

What is a Database descriptor packet?

Select one of the following:

  • A database descriptor packet is another name for hello-packets which keeps the databases synchronized across all routers in an area.

  • It's used to compare the LSDB between routers in an area to see if more link-state Query packets need to be sent.

  • It describes the database of the router, what RID, prefix and if it's a DR or BDR.

  • it compares the LSDB of the routers participating in order to see what is missing in each database to get a fully synchronized topology of the area.

Explanation

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