IS-IS复习题.doc

IS-IS单选题1Which of the following is ES-IS responsible for? (下面哪一个是ES-IS负责的？) A) Level 0 routing （第0层路由）B) Level 1 routing （第1层路由）C) Level 2 routing （第2层路由）D) Level 3 routing （第3层路由）2Routing between areas is described as _. (区域之间的路由被描述为？) A) Level 0 routing （第0层路由）B) Level 1 routing （第1层路由）C) Level 2 routing （第2层路由）D) Level 3 routing （第3层路由）3Level 1 routing is responsible for which task? (第1层路由负载哪一个任务？) A) exchanging information about paths between areas （交换有关区域之间路径的信息）B) building topology of ESs and ISs in areas （构建区域中ES和IS的拓扑）C) using ES-IS to learn prefix information （使用ES-IS来了解前缀信息）D) CLNP routing （CLNP路由）4Level 2 routing is responsible for which task? (第2层路由负载哪一个任务？) A) exchanging information about paths between areas （交换有关区域之间路径的信息）B) building topology of ESs and ISs in areas （构建区域中ES和IS的拓扑）C) using ES-IS to learn prefix information （使用ES-IS来了解前缀信息）D) CLNP routing （CLNP路由）5Which component does a NET address identify? (NET地址标识哪一个组件？) A) interface （接口）B) device （设备）C) process （进程）D) protocol （协议）6Which characteristic describes a NET? (哪一个特征描述NET？) A) always has an AFI of 49 （AFI始终是49）B) always has a 3-byte HO-DSP （始终有3字节HO-DSP）C) always has an NSEL of 00 （NSEL始终为0）D) is never assigned to a router（绝不指派给路由器）7 Which prefix does private AFI use? (私有AFI使用哪一个前缀？) A) 49.0001 B) 37 C) 47 D) 49 E) 37.1921 8Which term describes an NSAP address? (哪一个术语描述NSAP地址？) A) NSCAR address （NSCAR地址）B) CLNS address （CLNS地址）C) protocol-specific port （协议指定的端口）D) replacement for BGP （BGP的替代品）9How are IS-IS PDUs transported? (IS-IS PDU是如何传输的？) A) within IP packets （在IP数据包中）B) within CLNS packets （在CLNS数据包中）C) directly within frames （直接在数据帧中）D) reliably using TCP（可靠地使用TCP）10What does TLV stand for? (TLV代表什么？) A) Time, Level, Value （时间、层次、值）B) Text, Level, Volume （文本、层次、容量）C) Time, Length, Volume （时间、长度、容量）D) Type, Length, Value（类型、长度、值）11How does IS-IS deal with DIS failures? (Source: Performing IS-IS Routing Operations) A) The Backup IS (BIS) asserts itself as the new DIS. B) The failure is recognized quickly and a new DIS is elected. Because IS-IS synchronizes LSDBs frequently on a LAN, this is rarely a problem. C) The network reverts to general topology, and every IS forms an adjacency with every other IS. D) It does not. The DIS must be restored quickly to prevent communication problems.12How does IS-IS adapt the directed graph approach (implicit in Dijkstras algorithm) for use in a multipoint environment such as Ethernet? (Source: Performing IS-IS Routing Operations) A) It uses a pseudonode. B) It uses a system ID. C) The algorithm is amended. D) Dijkstras algorithm is used only on point-to-point links. 13What is the function of CSNPs? (Source: Performing IS-IS Routing Operations) A) to request a missing LSP B) to acknowledge an LSP C) to provide alerts D) to maintain LSDB synchronization 14Which address component is used to identify the router in an IS-IS environment? (Source: Performing IS-IS Routing Operations) A) SNPA B) NRLI C) NET D) system number15What is an SPNA? (Source: Performing IS-IS Routing Operations) A) the OSI specification for SPF B) a data-link address C) level 2 routing D) the interdomain component of IS-IS, not supported by Cisco routers 16Which communication method is used by devices in two Level 1 areas? (Source: Performing IS-IS Routing Operations) A) tunnel B) Level 1 runs on broadcast multiaccess networks C) through Level 2 D) using PDUs17What does the network entity title identify in IP networks? (Source: Configuring Basic Integrated IS-IS) A) a router interface B) a router process C) a router D) a subnet 18When does Dijkstras algorithm run to determine the best path? (Source: Configuring Basic Integrated IS-IS) A) after the PRC process is completed B) when maximum age is reached C) after databases are synchronized D) at IS-IS startup 19Which command displays the IS-IS Level 1 routing table? (Source: Configuring Basic Integrated IS-IS) A) show clns route B) show ip neighbor C) show isis route D) which-route E) show clns neighbor20Which command provides a list of all IS-IS areas known to a router? (Source: Configuring Basic Integrated IS-IS) A) show clns route B) show ip route C) which-route D) show isis route 21A Level 1-2 IS with the NET 49.000A.0000.0C12.3456.00 receives traffic going to 49.001A.0000.0C78.9AB.00. Which table does it use to route the traffic? (Source: Configuring Basic Integrated IS-IS) A) IS-IS topology B) Level 1 routing table C) Level 2 routing table D) CLNS routing table22Which command reveals the redistribution processes in IS-IS? (Source: Configuring Basic Integrated IS-IS) A) show clns protocol B) show clns interface C) show isis route D) show isis database 23Which command would you use to view the router interfaces that are currently running CLNS? (Source: Configuring Basic Integrated IS-IS) A) show clns protocol B) show clns interface C) show isis route D) show isis database 24Which address does Integrated IS-IS require? (Source: Configuring Basic Integrated IS-IS) A) IP address to use as router ID B) IP addresses on interfaces C) CLNS address to identify the device D) CLNS addresses on interfaces25Routing from 49.BAD1.1921.6800.0111.00 to 49.BAD7.1921.6800.0112.00 takes place at what level? (Source: Configuring Basic Integrated IS-IS) A) Level 1 B) Level 2 C) not enough information to determine D) routing not possible between these networks26The router identifies which interfaces participate in IS-IS routing by the _. (Source: Configuring Basic Integrated IS-IS) A) network command B) NET that is configured for each interface C) ip router isis command D) NET that is configured for each router 27IS-IS summarization allows you to _. (Source: Configuring Basic Integrated IS-IS) A) summarize the list of NETs B) summarize the area address C) summarize a set of IP addresses into a less specific address D) enumerate the IS and ES neighbors28Which command shows the sources of Integrated IS-IS routing information? (Source: Configuring Basic Integrated IS-IS) A) show ip protocols B) show clns protocols C) show ip route isis D) show ip route 29What is the default IS-IS routing level of a Cisco router? (Source: Configuring Basic Integrated IS-IS) A) 0 B) Level 1 C) Level 2 D) 3 E) Level 1-2 30To configure IS-IS on an interface, which command must be executed from interface configuration mode? (Source: Configuring Basic Integrated IS-IS) A) router isis B) isis interface C) ip router isis D) is-type level-131What is the default IS-IS metric for Fast Ethernet interfaces? (Source: Configuring Basic Integrated IS-IS) A) 10 B) 16 C) 83 D) 100 32IP routing scalability is achieved by _. (Source: Configuring Basic Integrated IS-IS) A) NET assignment B) route summarization C) controlling ES-IS D) limiting IS-IS resynchronization issues多选题1Which two protocols does Integrated IS-IS support? (集成IS-IS支持哪两个协议？) A) IP B) IPX C) OSI CLNS D) AppleTalk 2 Which two characteristics describe IS-IS? (哪两个特征描述了IS-IS？) A) It is an IGP. （它是IGP）B) It is an EGP. （它是EGP）C) It is efficient in its use of network resources. （就其网络资源的使用而言，它是很有效的）D) It is an advanced distance vector routing protocol.（它是高级距离矢量路由协议）3Which two routing levels does IS-IS support? (IS-IS支持哪两个路由层？) A) Level 1 for IP （用于IP的第1层）B) Level 1 for interarea routing （用于区域间路由的第1层）C) Level 2 for interarea routing （用于区域间路由的第2层）D) Level 2 for CLNS （用于CLNS的第2层）E) Level 0 for interdomain routing （用于域间路由的第0层）F) Level 1 for intra-area routing （用于区域内路由的第1层）G) Level 2 for intra-area routing （用于区域内路由的第2层）4Which two of the following are IS-IS responsible for? (以下哪两个是IS-IS负责的？) A) Level 0 routing （第0层路由）B) Level 1 routing （第1层路由）C) Level 2 routing （第2层路由）D) Level 3 routing （第3层路由）5A good IS-IS design features which two properties? (哪两个属性是良好的IS-IS设计特征？) A) CLNS addresses confined to Level 1 （限定在第1层的CLNS地址）B) a summarizable address plan （可汇总的地址规划）C) two-level hierarchy （两级层次）D) routers with minimal memory and CPU（最低内存和CPU要求的路由器）6Which two characteristics describe IS-IS advantages over OSPF? (哪两个特征描述了IS-IS优于OSPF) A) better support from the IETF （来自IETF的更好支持）B) more documentation and support （更多技术文档与支持）C) ubiquitously implemented （无所不在的实现）D) support for CLNS （支持CLNS）E) more extensible （更易扩展）F) faster convergence（更快的收敛）7Which two statements are true with reference to CLNS? (提到CLNS时，哪两句是对的？) A) Within an area, all system IDs must be unique. （在一个区域中，所有系统ID必须是唯一的）B) Within an area, all area addresses (AFI, IDI, HO-DSP) must be identical. （在一个区域中，所有区域地址（AFI、IDI、HO-DSP）必须是一致的）C) Within an area, AFI and IDI must be identical, but HO-DSP may vary. （在一个区域中，AFI和IDI必须是一致的，但HO-DSP可以不同）D) Within an area, all IP addresses must be in the same classful network.（在一个区域中，所有IP地址必须在相同的有类网络中）8Which two terms are SNPAs? (哪两个术语是SNPA？) A) MAC address （MAC地址）B) Frame Relay DLCI （帧中继的DLCI）C) IP address （IP地址）D) CLNS address including NSEL （包含NSEL的CLNS地址）E) delivery point for traffic（流量交付点）9Which three conditions are system ID requirements? (系统ID需要哪三个条件？) A) must be 8 bytes （必须8个字节）B) must be unique in an area （在区域中必须唯一）C) must be classless （必须是无类的）D) must be unique within Level 2 routers in a routing domain （在一个路由域的第2层路由器中必须是唯一的）E) must be 6 bytes on a Cisco router （在Cisco路由器上必须是6字节）10Which two statements are parts of OSI routing logic? A Level 1-2 router should compare the destination area address to its own area address and if they are _ (Choose two.) (Source: Performing IS-IS Routing Operations) A) the same, route at Level 1. B) different, route at Level 1. C) the same, route at Level 2. D) different, route at Level 2.11Adjacencies are formed in IS-IS between _. (Choose two.) (Source: Performing IS-IS Routing Operations) A) ISs in the same area B) pseudonodes C) two ISs doing routing at the same level (Level 1 or Level 2) D) interfaces on a broadcast network 12What are the four types of IS-IS PDUs? (Choose four.) (Source: Performing IS-IS Routing Operations) A) hello B) SNAP C) LSP D) PSNP E) CSNP F) IP/IPX G) OSPF 13Which three topology types are supported by IS-IS? (Choose three.) (Source: Performing IS-IS Routing Operations) A) broadcast for LAN links B) broadcast for multipoint WAN links C) stub for networks with a single exit D) point-to-point for LAN links E) point-to-point for point-to-point WAN links F) NBMA for WAN links 14Which four technologies are appropriate for point-to-point topology? (Choose four.) (Source: Performing IS-IS Routing Operations) A) ATM PVC B) leased line C) Ethernet D) Frame Relay E) Token Ring F) ISDN Dial-on-Demand15Which two network representations are supported by IS-IS? (Choose two.) (Source: Performing IS-IS Routing Operations) A) broadcast B) NBMA C) stub D) point-to-point E) NSSA 16Which two criteria does a router running Integrated IS-IS use to determine which routes to place in the IP routing (forwarding) table? (Choose two.) (Source: