单选题Which statement best describes OSPF external LSAs （type 5）？（）A OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.B External LSAs (type 5) are automatically changed to t

题目

单选题

Which statement best describes OSPF external LSAs （type 5）？（）

OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.

External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.

Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.

External network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area

参考答案和解析

正确答案： C

解析：暂无解析

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相似问题和答案

第1题：

Which of the following is true about routers internal to a totally NSSA area?()

A. Routers cannot redistribute external routes into the area.

B. Routers should have zero Type 3 LSAs in their LSDBs.

C. Routers should have zero Type 5 LSAs in their LSDBs.

D. Routers should learn default routes from the ABRs attached to the area.

参考答案：C, D

第2题：

Refer to the exhibit. OSPF is running throughout the network. You want to minimize the propagation of LSAs into and out of A rea 1. Which OSPF feature would best achieve this goal? ()

A. stub

B. totally stubby

C. NSSA

D. totally NSSA

参考答案：D

第3题：

OSPFv3 interarea－prefix－LSAs are most similar to which OSPFv2 LSA type?()

A. Type 7 LSAs

B. Type 4 summary LSAs

C. Type 3 summary LSAs

D. Type 5 AS-external LSAs

参考答案：C

第4题：

OSPF stub areas are an important tool for the Network designer； which of the following two shouldbe considered when utilizing OSPF stub areas？（）

A、 OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs
B、 OSPF not so stubby areas are particularly useful as a simpler form of summarization
C、 OSPF stub areas are always insulated from external changes
D、 OSPF totally stubby cannot distinguish among ABRs for the best route to destinationsoutsidethe areas
E、 OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPFdomain

正确答案:B,D

第5题：

When verifying the OSPF link state database, which type of LSAs should you expect to see within the different OS PF area types?（）

A、All OSPF routers in stubby areas can have type 3 LSAs in their database.
B、All OSPF routers in stubby areas can have type 7 LSAs in their database.
C、All OSPF routers in totally stubby areas can have type 3 LSAs in their database.
D、All OSPF routers in totally stubby areas can have type 7 LSAs in their database.
E、All OSPF routers in NSSA areas can have type 3 LSAs in their database.
F、All OSPF routers in NSSA areas can have type 7 LSAs in their database.

正确答案:A,E,F

第6题：

Refer to the exhibit. OSPF is configured on all routers in the network. Area 5 is configured as an NSSA areA. The RIPv2 routes are redistributed into the OSPF domain on router R5. What two types of LSAs will be originated by router R5?（）

A. type 1 Router LSA

B. type 2 Network LSA

C. type 3 Network Summary LSA

D. type 4 ASBR Summary LSA

E. type 5 AS External LSA

F. type 7 NSSA External LSA

参考答案：A, F

第7题：

Which show command will display only the Type 5 LSAs in the OSPF topology database?()

A. show ip ospf database external

B. show ip ospf database nssa - external

C. show ip route ospf

D. show ip ospf datab ase summary

E. show ip route

参考答案：A

第8题：

Which router translates the Type 7 LSAs into Type 5 LSAs, according to RFC 1587 (OSPF NSSAOption) in an OSPF NSSA with more than one ABR?()

A. The router receiving the route translates the Type 7 LSA into a Type 5 LSA.

B. The ABR with the lowest router ID translates all Type 7 LSAs into Type 5 LSAs.

C. The ABR with the highest router ID translates all Type 7 LSAs into Type 5 LSAs.

D. All ABRs translate the Type 7 LSAs into Type 5 LSAs depending on which one has the lowest cost to the route.

参考答案：C

第9题：

The show ip ospf database external command displays information about which OSPF LSA type？（）

A、LSA type 1
B、LSA type 2
C、LSA type 7
D、LSA type 3
E、LSA type 9
F、LSA type 5

正确答案:F

第10题：

Which one of these statements is true of OSPF type 5 LSAs？（）

A、 They are used to summarize area routes to other areas.
B、 They are used in not-so-stubby areas to propagate external routes.
C、 They are used to notify areas of the ASBR.
D、 They are flooded to all areas except stub areas （external route）.

正确答案:D

Which statement best describes OSPF external LSAs （type 5）？（

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