多选题Area Border Router （ABR） is a router located on the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two types of areas？（）AArea 0BNSSACTotally stubbyDStub

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第3题：

From a design perspective which two of the following OHPF Statements are most relevant？（）

• A、 OSPF stub areas can be thought of as a simple form of summarization
• B、 OSPF cannot filter intra area routes
• C、 An ARR ran only exist in two areas - the backbone and one adjacent area
• D、 Performance issues in the Backbone area can be offset by allowing some traffic to transit anon-backbone area
• E、 the size of an area （the LSDB） will be constrained by the size of the IP MTU

第4题：

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?（）

• A、Each OSPF area requires a loopback interface to be configured. 
• B、Areas may be assigned any number from 0 to 65535.
• C、Area 0 is called the backbone area.
• D、Hierarchical OSPF networks do not require multiple areas.
• E、Multiple OSPF areas must connect to area 0.
• F、Single area OSPF networks must be configured in area 1.

第5题：

Which three statements about OSPF areas are true?（）

• A、Areas introduce a boundary on the link - state updates.
• B、Areas are  logical definitions specific to any given router.
• C、All routers within an area have the exact link - state database.
• D、The calculation of the Dijkstra algorithm on a router is limited to changes within an area.
• E、The area designated router will always  have a priority of 0.

第6题：

An OSPF non-backbone area follows external routes to be flooded within the area. These external routes are propagated into other areas. However， external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe？（）

• A、stub area
• B、transit area
• C、border area
• D、not-so-stubby area

第7题：

Area Border Router （ABR） is a router located on the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two types of areas？（）

• A、Area 0
• B、NSSA
• C、Totally stubby
• D、Stub

第8题：

Which of the following is true about an OSPF area border router (ABR)?（）

• A、The ABR must have multiple interfaces connected to the backbone areA
• B、An ABR is a router with two interfaces, each connected to a different nonbackbone areA
• C、The only requirement to be considered an  ABR is at least one interface connected to the backbone areA
• D、An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA

第9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.

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第14题：

To make OSPF area 4 totally stubby, the following command was issued on the ABR in router configuration mode: area 4 stub.Which two things need to be done to finish making area 4 a totally stubby area?（）

• A、Apply the area 4  stub command to all routers in the area
• B、On the ABR, use the area 4 stub command with the no - summary keyword
• C、On the ABR, specify a default cost for the area with the area default - cost command
• D、On the ABR, use the default - information originate  command to inject a default route into area 4
• E、Use the auto - cost command on each router in the area to automatically determine the cost to other OSPF areas

第15题：

When an OSPF design is planned, which implementation can help a router not have memory resource issues?（）

• A、Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations
• B、Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF
• C、Have less OSPF areas to reduce the need for interarea route summarizations
• D、Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2

第16题：

Which three restrictions apply to OSPF stub areas？ （）

• A、 No virtual links are allowed.
• B、 The area cannot be a backbone area.
• C、 Redistribution is not allowed unless the packet is changed to a type 7 packet.
• D、 The area has no more than 10 routers.
• E、 No autonomous system border routers are allowed.
• F、 Interarea routes are suppressed.

第17题：

An OSPF non-backbone area allows external routes to be flooded within the area. These external routes are propagated into other areas. However， external routes from other areas are not allowed to enter this area. Which type of SPF area does this describe？（）

• A、stub area
• B、transit area
• C、border area
• D、not-so-stubby area

第18题：

Which of the following are characteristics of OSPF areas?（）

• A、Hierarchical OSPF networks need to be in one area
• B、Multiple OSPF areas must connect to area 0
• C、Single area OSPF networks must be configured in area 1
• D、Areas can be assigned any number from 0 to 63535
• E、Area 0 is called the backbone area
• F、Each OSPF area need to be configured with a loopback interface

第19题：

Into which two types of areas would an area border router (ABR) inject a default route?（）

• A、stub
• B、the autonomous system of an exte rior gateway protocol (EGP)
• C、NSSA
• D、totally stubby
• E、the autonomous system of a different interior gateway protocol (IGP)
• F、area 0

第20题：

An OSPF non-backbone area allows external routes to be flooded within the area. These externalroutes are propagated into other areas. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）

• A、stub area
• B、transit area
• C、border area
• D、not-so-stubby area

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