Which of the following routing protocols are less likely prone routing loops and network reachability problems when used in discontiguous networks?()A. IGRPB. CDPC. OSPFD. RIP v1E. RIP v2F. EIGRP

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第2题：

Which of the following routing protocols are less likely prone routing loops and network reachability problems when used in discontiguous networks?（）

• A、IGRP
• B、CDP
• C、OSPF
• D、RIP v1
• E、RIP v2
• F、EIGRP

正确答案:C,E,F

第3题：

Which routing table stores IPv4 unicast routes and is used by multicast routing protocols to prevent loops?（）

• A、inet.0
• B、inet.1
• C、inet.2
• D、inet.3

正确答案:C

第4题：

In a switched LAN network, what is the Spanning-Tree algorithm used for?（）

• A、It is used to provide a mechanism for routing updates in switched environments.
• B、It is used to prevent routing loops in networks with redundant routes.
• C、It is used to prevent switching loops in networks with redundant switched routes.
• D、It is used to manage, the addition, deletion, and naming of VLANs across multiple switches.
• E、It is used to segment a network into multiple collision domains.
• F、None of the above.
• G、All of the above are functions of STP.

正确答案:C

第5题：

Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?（）

• A、Only routers can split boundaries (horizons) between concentric networks.
• B、Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
• C、Networks can only remain fully converged if all information is sent out all active interfaces.
• D、Information about a route should not be sent back in the direction from which the original update came.
• E、Distance vector protocols need fall back routers that are responsible for momentary loops.

正确答案:D

第6题：

Which of the following routing protocols are less likely prone to problems in non contiguous networks?（）

• A、IGRP
• B、ICMP
• C、OSPF
• D、RIP v1
• E、RIP v2
• F、EIGRP

正确答案:C,E,F

第7题：

The statements below compare and contrast link state and distance vector routing protocols. Which of these are true?（）

• A、Distance vector protocols send the entire routing table to directly connected neighbors.
• B、Distance vector protocols are responsible for sending updates to all networks listed in the routing table.
• C、Link state protocols are responsible for sending the entire routing table to the whole network.
• D、Link state protocols send updates regarding their own links status to all other routers on the network.

正确答案:A,D

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第13题：

Which of the following technologies can be used in distance vector routing protocols to prevent routing loops?（）

• A、Spanning Tree Protocol
• B、Shortest path first tree
• C、Link-state advertisements (LSA)
• D、Hold-down timers
• E、Split horizon
• F、VRP

正确答案:D,E

第14题：

Non-contiguous networks can pose a problem for network reachability in certain circumstances. Which of the following routing protocols have means of minimizing the risk?（）

• A、RIPv1
• B、RIPv2
• C、EIGRP
• D、IGRP
• E、OSPF
• F、VLSM

正确答案:B,C,E

第15题：

Two autonomous networks who wish to exchange routing data should use which of the following protocols?（）

• A、OSPF
• B、BGP
• C、EIGRP
• D、IS-IS

正确答案:B

第16题：

Which two statements are true about the role of split horizon？（）

• A、It is a function used by routing protocols to install routes into routing table
• B、It is a function that prevents the advertising of routes over an interface that the router is usingto reach a route
• C、Its function is to help avoid routing loops.
• D、It is a redistribution technique used by routing protocols

正确答案:B,C

第17题：

Which two are advantages of static routing when compared to dynamic routing?（）

• A、Security increases because only the network administrator may change the routing tables
• B、Configuration complexity decreases as network size increases
• C、Routing updates are automatically sent to neighbors
• D、Route summarization is compued automatically by the router
• E、Routing traffic load is reduced when used in stub network links
• F、An efficient algorithm is used to build routing tables,using automatic updates
• G、Routing tables adapt automatically to topology changes.

正确答案:A,E

第18题：

Which of the following statements are correct in regard to classless routing protocols?（）

• A、Discontiguous subnets are not allowed.
• B、Variable length subnet masks are allowed.
• C、RIP v1 is a classless routing protocol.
• D、IGRP supports classless routing within the same autonomous system.
• E、RIP v2 supports classless routing.

正确答案:B,E

第19题：

Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）

• A、Site Of Origin SOO.
• B、SHAM links with OSPF
• C、BGP cost community
• D、BGP feature allow-as in
• E、RPF Reverse Path forwarding.
• F、Access-list Control in Distance Vector protocol like RIP and EIGRP.

正确答案:A,F

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