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Question 1
Question
Which LSA sends out information about known networks in an area?
Answer
-
Type 1 Router LSA
-
Type 2 Network LSA
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Type 3 Summary LSA
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Type 4 ASBR Summary LSA
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Type 5 Autonomous system external LSA
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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.
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The type 2 LSA is only used in PPP-network types when DR and BDR is not used.
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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.
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Type 3 LSA's are created from internal routers.
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Type 3 LSA's needs an ASBR.
-
Type 3 LSA's needs an ABR.
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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.
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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.
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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.
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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
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Inter-area prefix LSA
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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.
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Create a static default-route and use the redistribute command.
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Use the default-information originate command.
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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.
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The calculation of shortest path.
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The election of DR and BDR
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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.
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It's used to compare the LSDB between routers in an area to see if more link-state Query packets need to be sent.
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It describes the database of the router, what RID, prefix and if it's a DR or BDR.
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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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