OSPF is a link-state routing protocol。It is designed to be run internal to a single __（71__system。Each OSPF router maintains an identical __（72）__ describing the autonomous system’s topology。From this database，a routing table is calculated by constructing

题目

OSPF is a link-state routing protocol。It is designed to be run internal to a single __（71__system。Each OSPF router maintains an identical __（72）__ describing the autonomous system’s topology。From this database，a routing table is calculated by constructing a shortest-path __（73）__。OSPF recalculates routes quickly in the face of topological changes，utilizing a minimum of routing __（74）__ traffic。OSPF provides support for equal-cost multipath。An area routing capability is provided，enabling an additional level of routing protection and a reduction in routing protocol __（75）__。

A.autonomous

B.network

C.computer

D.server

相似考题

1.Last year she _designed_______ a new symbol for the company.A. wroteB. designedC. builtD. drew

2.The following output on Router R1 lists details of a BGP route for 190.1.0.0/16. Which of the following is true based on this output?（）R1 show ip bgp 19 0.1.0.0/16BGP routing table entry for 190.1.0.0/16, version 121Paths: (1 available, best 1, table Default - IP - Routing - Table)Advertised to update - groups:11 2 3 41.1.1.1 from 2.2.2.2 (3.3.3.3)Origin IGP, metric 0, localpref 100, valid, internal, bestA. R1 has a neighbor 1.1.1.1 command configured.B. R1 has a neighbor 2.2.2.2 command configured.C. The show ip bgp command lists a line for 190.1.0.0/16 with both an ">" and an "i" on the left.D. R1 is in ASN 1.

3.ThenetworksetupforthistroubleticketisshowninFigure3.TroubleTicketStatementDSW1andR4cannotpingR2’sloopbackorR2’ss0/0/0/0.12IPv6address.InitialtroubleshootingshowsandR2isnotanOSPFv3neighboronR3.ConfigurationonR2ipv6unicast-routing!ipv6routerospf6router-id2.2.2.2!interfaces0/0/0/0.23ipv6address2026：：1：1/122ConfigurationR3ipv6unicast-routing!ipv6routerospf6router-id3.3.3.3!interfaces0/0/0/0.23ipv6address2026：：1：2/122ipv6ospf6area0Figure3OnWhichdeviceisthefaultconditionlocated?（）

4.Which configuration command allows the ERX Edge Router to advertise customer networks into the provider’s IGP?()A.redistribute directB.redistribute staticC.redistribute connectedD.redistribute access-internal

参考答案和解析
正确答案：A
OSPF是一种链路状态路由协议。该协议被设计成运行在单一的自治系统内部。每一个OFPF路由器都保持了同样的数据库，该数据库可以描述自治系统的拓扑图。通过该数据库，可以搭建的最短路径树以此计算路由表。OSPF在拓扑发生变化时，利用最小路由组播流量的快速重新计算路由。OSPF支持多条等价路径。OSPF提供区域路由的能力，在路由协议流量中赋予一个额外的路由保护和路由剪截能力。
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