多选题Which three restrictions apply to OSPF stub areas?（）AThe area cannot be a backbone area.BInter area routes are suppressed.CThe area has no more than 10 routers.DNo virtual links are allowed.ENo autonomous system border routers are allowed.FRedistributi

第1题：

Which of the following is an OSPF configuration parameter that is used on an ABR, but not on an internal router？（）

• A、A virtual link to area 0.
• B、OSPF summarization command.
• C、default - cost extension to the area command.
• D、no - summary extension to the area stub comm and.
• E、None of the other alternatives apply

第2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3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）.

第4题：

There are three static routes in the routing table that need to be announced to your OSPF peers. Which method is used to accomplish this?（）

• A、Apply an import policy to OSPF that injects the static routes into OSPF
• B、Apply an import policy to the static routes that injects the static routes into OSPF
• C、Apply an export policy to the static routes that injects the static routes into OSPF
• D、Apply an export policy to OSPF that injects the static routes into OSPF

第5题：

Which statement describes the process ID that is used to run OSPF on a router ?（）

• A、It is locally significant and must be the same throughout an area
• B、It is globally significant and is used to represent the AS number
• C、It is locally significant and is used to identify an instance of the OSPF database
• D、It is globally significant and is used to identify OSPF stub areas

第6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7题：

The maximum number of routers per OSPF area typically depends on which three factors?（）

• A、the kind of OSPF areas being implemented
• B、the number of external LSAs in the network
• C、the number of DRs and BDRs in the areas
• D、the number of virtual links in the areas
• E、how well the areas can be summarized
• F、the use of LSA filters

第8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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第13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14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

第15题：

Which of the following are true statements regarding the characteristics of OSPF areas? Select all that apply.（）

• A、All OSPF networks require the use of multiple areas
• 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16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17题：

Which two design recommendations are most appropriate when OSPF is the data center core routing protocol？ （）

• A、 Never use passive interfaces.
• B、 Use NSSA areas from the core down.
• C、 Use totally stub areas to stop type 3 LSAs.
• D、 Use the lowest Ethernet interface IP address as the router ID.
• E、 Tune OSPF timers to enable OSPF to achieve quicker convergence

第18题：

Which two design recommendations are most appropriate when OSPF is the data center core routing protocol? （）

• A、Never use passive interfaces.
• B、Use NSSA areas from the core down.
• C、Use totally stub areas to stop type 3 LSAs.
• D、Use the lowest Ethernet interface IP address as the router ID.
• E、Tune OSPF timers to enable OSPF to achieve quicker convergence.

第19题：

Which command would display OSPF parameters such as filters， default metric， maximum paths，and number of areas configured on a router？（）

• A、show ip protocol
• B、show ip route
• C、show ip ospf interface
• D、show ip ospf
• E、show ip interface
• F、None of the other alternatives apply

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