Random OSPF fun time.

I L
Quiz by I L, updated more than 1 year ago
I L
Created by I L over 5 years ago
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Description

Random questions about OSPF

Resource summary

Question 1

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

Question 2

Question
What option matches the type 2 LSA?
Answer
  • 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.

Question 3

Question
What characteristics corresponds with the type 3 LSA?
Answer
  • 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.

Question 4

Question
The type 4 LSA contains information about?
Answer
  • The router ID of the DR.
  • How to reach the ABR.
  • How to reach a specific area.
  • How to reach the ASBR.

Question 5

Question
What routes-type sends out type 5 LSA for what purpose?
Answer
  • 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.

Question 6

Question
What is the purpose of the type 7 LSA?
Answer
  • 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.

Question 7

Question
Stub areas allow type 5 LSA's.
Answer
  • True
  • False

Question 8

Question
Stub areas allow type 3 LSA.
Answer
  • True
  • False

Question 9

Question
The AS summary LSA is created by the?
Answer
  • DR
  • ABR
  • ASBR
  • Backbone Router

Question 10

Question
What is the type 8 LSA called?
Answer
  • Link LSA
  • Intra-area prefix LSA
  • Inter-area prefix LSA
  • Link-local LSA

Question 11

Question
The type 9 LSA is used for what?
Answer
  • 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.

Question 12

Question
Which LSA types are renamed in OSPFv3?
Answer
  • Router LSA
  • Summary LSA
  • Network LSA
  • ASBR summary LSA
  • AS LSA
  • Type 7 LSA

Question 13

Question
OSPFv3 supports only IPv4
Answer
  • True
  • False

Question 14

Question
OSPF supports what types of authentication?
Answer
  • MD5
  • Plain text
  • SHA
  • Timed based MD5
  • Shared secret

Question 15

Question
Virtual link can be configured over stub areas.
Answer
  • True
  • False

Question 16

Question
To configure route summarization in OSPF, which command is used?
Answer
  • Area range
  • Summary-address
  • default-information originate
  • Auto-summary enable

Question 17

Question
How do you inject a default-route into OSPF?
Answer
  • 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.

Question 18

Question
Where is priority used in OSPF?
Answer
  • 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.

Question 19

Question
What is a Database descriptor packet?
Answer
  • 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.
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