多选题Which statements describe the routing protocol OSPF?（）AIt supports VLSM.BIt is used to route between autonomous systems.CIt confines network instability to one area of the network.DIt increases routing overhead on the network.EIt allows extensive contr

第1题：

Which two statements are characteristics of a distance vector routing protocol?（）

• A、RIP is an example of distance vector routing protocols
• B、Updates are periodic and include the entire routing table
• C、Routing updates are sent only after topology changes
• D、The protocol can be useful in hub-and-spoke and hierarchical networks
• E、Convergence is usually faster than with link state protocols
• F、Each router has its own view of the topology

第2题：

Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?（）

• A、A routing protocol is assigned to an interface and determines the method of packet delivery.
• B、A routed protocol is assigned to an interface and determines the method of packet delivery.
• C、A routing protocol determines the path of a packet through a network.
• D、A routed protocol determines the path of a packet through a network.
• E、A routing protocol operates at the transport layer of the OSI model.
• F、A routed protocol updates the routing table of a router.

第3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

第4题：

Open Shortes t Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) working group of the Internet Engineering Task Force (IETF). Which two statements best describe the OSPF link - state routing pro tocol?（）

• A、OSPF sends updates every 10 seconds
• B、OSPF sends triggered updates when a network change occurs
• C、When a link state is changed, the router that detected the change creates a link - state advertisement (LSA) and propagates it  to all OSPF devices using the 224.0.0.6 multicast address
• D、OSPF sends summaries of individual link- state entries every 30 minutes to ensure LSDB synchronization

第5题：

How will router A choose a path to the 10.1.2.0/24 network when different routing protocols are configured (Choose three.)（）。

• A、If RIPv2 is the routing protocol, only the path AD will be installed in the routing table by default.
• B、If RIPv2 is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.
• C、If EIGRP is the routing protocol, only the path AD will be installed in the routing table by default.
• D、If EIGRP is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.
• E、If EIGRP and OSPF are both running on the network, the EIGRP paths will be installed in the routing table.
• F、If EIGRP and OSPF are both running on the network, the OSPF paths will be installed in the routing table.

第6题：

Which statements describe the routing protocol OSPF?（）

• A、It supports VLSM.
• B、It is used to route between autonomous systems.
• C、It confines network instability to one area of the network.
• D、It increases routing overhead on the network.
• E、It allows extensive control of routing updates.
• F、It is simpler to configure than RIP v2.

第7题：

Select the three best answers which best describe Private Network-to Network Interface （PNNI） in an ATM network.（）

• A、It is the Routing protocol used between ATM switches
• B、PNNI uses the same Dijsktra algorithm for SPF calculation
• C、PNNI and OSPF use the same Database to make cohesive decision for packet forwarding
• D、PNNI measures line capacities and delays in addition to simple cost metrics

第8题：

Which two are NOT characteristics of the OSPF routing protocol?（）

• A、It confines network instability to a single area of network.
• B、It increases the routing overhead of the network
• C、It supports VLSM
• D、It routes between Autonomous Systems.
• E、It allows extensive control of routing updates

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第13题：

When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? As a Network Engineer, it is necessary for you to know how to implement MPLS VPNs between Customer Edge and Provider Edge routers. Refer to the following descriptions, which one is making sense?（）

• A、If using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution
• B、If using IS-IS as the PE-CE routing protocol, no redistribution is required
• C、If using static routes between the CE and PE routers, no redistribution of other VPN routes is required
• D、If PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required

第14题：

Which of the following statements regarding routed and routing protocols are true?（）

• A、A routed protocol is assigned to an interface and determines the method of packet deliver.
• B、A routing protocol determines the path of a packet through a network.
• C、A routed protocol determines the path of a packet through a network.
• D、A routing protocol operates at the transport layer of the OSI model.
• E、A routed protocol updates the routing table of a router.

第15题：

A routing protocol is required that supports: 1)routing update authentication 2)an addressing scheme that conserves IP addresses 3)multiple vendors 4)a network with over 50 routers Which routing protocol fulfills these requirements（）。

• A、RIPv1
• B、RIPv2
• C、EIGRP
• D、OSPF

第16题：

Which two statements about route redistribution when implementing OSPF are true?（）

• A、Routes learned using any IP routing protocol can only be redistributed into non IP routing protocols.
• B、OSPF can import routes learned using EIGRP, RIP, and IS - IS.
• C、OSPF routes cannot be exported into EIGRP, RIP, an d IS - IS.
• D、At the interdomain level, OSPF cannot import routes learned using BGP.
• E、OSPF routes can be exported into BGP.

第17题：

What are three characteristics of the OSPF routing protocol?（）

• A、It converges quickly.
• B、OSPF is a classful routing protocol.
• C、It uses cost to determine the best route.
• D、It uses the DUAL algorithm to determine the best route.
• E、OSPF routers send the complete routing table to all directly attached routers.
• F、OSPF routers discover neighbors before exchanging routing information.

第18题：

Which of the following statements describe the characteristic of link state routing protocols?（）

• A、The exchange of an advertisement is triggered by a change in the network.
• B、All routers exchange routing tables with each other in a multipoint network.
• C、Packets are routed based upon the shortest path to the destination.
• D、Paths are chosen depending on the cost efficiency factor.
• E、Every router in an OSPF area is capable of representing the entire network topology.
• F、Only the designated router in an OSPF area can represent the entire network topology.

第19题：

When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? （）

• A、If using IS-IS as the PE-CE routing protocol, no redistribution is required.
• B、If using static routes between the CE and PE routers, no redistribution of other VPN routes is required.
• C、If the PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required.
• D、If RIP is the routing protocol that is used between the PE-CE routers, no redistribution is required, but any other protocol will require redistribution.
• E、If using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution.

第20题：

Which of the following routing protocols is strictly a distance vector protocol?（）

• A、IS-IS
• B、BGP
• C、EIGRP
• D、OSPF

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