Which two are characteristics of the IS －IS protocol but not OSPF?()A. forms adjacencies with all neighborsB. supports demand circuit routingC. provides routing support for multiple network layer protocolsD. utilizes SPF algorithmE. provides for network s

第1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2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3题：

Which two statements are correct regarding default protocol preference values?（）

• A、RIP is preferred over OSPF external routes.
• B、Direct, local, and static routes have the same preference value.
• C、OSPF's preference value is lower than BGP.
• D、OSPF has a single preference value for both internal and external routes.

第4题：

Which two statements are correct regarding default protocol preference values?（）

• A、OSPF internal routes have a lower preference than static routes.
• B、Both direct and local routes have the same preference value.
• C、OSPF's preference value is lower than BGP.
• D、OSPF has a single preference value for both internal and external routes.

第5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6题：

Which two of these are characteristics of the 802.1Q protocol?（）

• A、it is a layer 2 messaging protocol which maintains vlan configurations across network.
• B、it includes an 8-bit field which specifies the priority of a frame.
• C、it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.
• D、it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.
• E、it is a trunking protocol capable of carring untagged frames.

第7题：

Which two statements are correct regarding the default protocol preference values? （）

• A、RIP is preferred over OSPF external routes
• B、Direct, local and static routes have the same preference value
• C、OSPF's preference value is lower than BGP
• D、OSPF has a single preference value for both internal and external routes

第8题：

第9题：

第10题：

第11题：

第12题：

第13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

第14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15题：

Which two items should you know when configuring OSPF to dynamically learn routes? （）(Choose two.)

• A、OSPF area ID
• B、OSPF neighbor address
• C、OSPF loopback address
• D、OSPF authentication type

第16题：

Which two characteristics describe the UDP protocol?（）

• A、limited error checking
• B、defined timers
• C、no recovery mechanisms
• D、three-way handshake

第17题：

Which two are characteristics of the IS -IS protocol but not OSPF?（）

• A、forms adjacencies with all neighbors
• B、supports demand circuit routing
• C、provides routing support for multiple network layer protocols
• D、utilizes SPF algorithm
• E、provides for network scalability by allowing the network to be separated into areas
• F、three layers of hierarchical routing

第18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

第19题：

Which command allows viewing of only OSPF routes?（）

• A、show ip ospf route
• B、show ip route protocol ospf
• C、show route protocol ospf
• D、show ospf table

第20题：

第21题：

第22题：

第23题：