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【单项选择题】

The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）

A、A.Reverse Path Forwarding

B、B.Hardware-based forwarding

C、C.UDP forwarding

D、D.Layer 2 Forwarding

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更多“The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）”相关的问题
第1题
[多选题] Which of the following data structures exist on a router for the OSPF routing protocol？（）

A、OSPF topology table  B、OSPF interface table  C、OSPF routing information base  D、OSPF link-state database  E、OSPF adjacency table  F、OSPF neighbor table  

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第2题
[单选题] Which information will the Cisco IOS command show ip ospf rib display？（）

A、only the local OSPF routes  B、only the OSPF routes installed in the routing table  C、only the remotely learned OSPF routes  D、all the OSPF routes from the OSPF database that are eligible to be put in the routing table  

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第3题
[单选题] You have a router running BGP for the MPLS network and OSPF for the local LAN network at the sales office. A route is being learned from the MPLS network that also exists on the OSPF local network. It is important that the router chooses the local LAN route being learned from the downstream switch running OSPF rather than the upstream BGP neighbor. Also， if the local OSPF route goes away， the BGP route needs to be used. What should be configured to make sure that the router

A、static route needs to be added  B、floating static route needs to be added  C、bgp backdoor command  D、ospf backdoor command  

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第4题
[单选题] You have a router running BGP for the MPLS network and OSPF for the local LAN network at the sales office. A route is being learned from the MPLS network that also exists on the OSPF local network.It is important that the router chooses the local LAN route being learned from the downstream switch running OSPF rather than the upstream BGP neighbor. Also，if the local OSPF route goes away，the BGP route needs to be used. What should be configured to make sure that the router will cho

A、static route needs to be added  B、floating static route needs to be added  C、bgp backdoor command  D、ospf backdoor command  

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第5题
[多选题] An OSPF link can be in multiple states at any given moment （ie. Exstart， exchange， full）. Whichtwo IOS commands let you view the state of the link？（）

A、show ip ospf  B、show ip protocols  C、show ip ospf neighbor  D、show ip ospf interface  

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第6题
[单选题] Which CLI command displays all OSPF LSAs received by the local router？（）

A、show ospf neighbor  B、show ospf database  C、show ospf interface  D、show ospf adjacency  

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第7题
[多选题] The OSPF External LSA for prefix x.x.x.x exists in the OSPF database， but the prefix is not installed in therouting table. Which are possible explanations？（）

A、Inbound distribute-list is configured under the ospf process and it is denying x.x.x.x  B、ASBR origination the LSA is not reachable  C、Route to the Forwarding Address in not an internal OSPF route  D、Route to the Forwarding Address is an internal OSPF route  E、Route to the ASBR does not follow the same path as the one to the Forwarding Address  

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第8题
[多选题] 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  

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第9题
[单选题] A switch has been configured with two vlans and is connected to a router with a trunk for inter-vlan routing.OSPF has been configured on the router，as the routing protocol for the network.Which statement about thisnetwork is true？（）

A、For the two vlans to communicate，a network statement for the trunk interface needs to be added to the OSPF configuration.  B、For the two vlans to communicate， a network statement for each subinterface needs to be  added  to the OSPF configuration.  C、Direct inter-vlan communication does not require OSPF  D、OSPF cannot be used if router-on-a-stick is configured on the router  

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第10题
[单选题] Which command is used to display the collection of OSPF link states？（）

A、show ip ospf lsa database（not A）  B、show ip ospf link-state  C、show ip ospf neighbors  D、show ip ospf database  

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