[单项选择]

OSPF is a link-state routing protocol. It is designed to be run internal to a single (1) system. Each OSPF router maintains an identical(2) describing the autonomous system's topology. From this database, a routing table is calculated by constructing a shortest-path (3).OSPF recalculates routes quickly in the face of topological changes, utilizing aminimum of routing (4) 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 (5).

空白（2）处应选择（）
A. tree
B. table
C. database
D. record

[单项选择]

OSPF is a link-state routing protocol. It is designed to be run internal to a single (1) system. Each OSPF router maintains an identical(2) describing the autonomous system's topology. From this database, a routing table is calculated by constructing a shortest-path (3).OSPF recalculates routes quickly in the face of topological changes, utilizing aminimum of routing (4) 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 (5).

空白（1）处应选择（）
A. autonomous
B. network
C. computer
D. server

[单项选择]

OSPF routing protocol typically runs over （）.

A. IP
B. TCP
C. UDP
D. ARP

[单选题]在进行网络故障排除时，你发现可能是某台路由器上的 OSPF 配置有问题，但是在登
录网络设备查看 OSPF 的配置时，发现 OSPF 与 BFD 联动的配置也是错误的，于 是你又
修改了 OSPF 和 BFD 的配置，这种网络故障排除方法属于下列哪一种？
A.分块法
B.对比配置法
C.分段法
D.自底向上法

[单选题]OSPF 只有在 Hello 报文中有验证信息。OSPF 支持 MD5 密文验证。
A.TRUE
B.FALSE

[单项选择]While doing calculation for the project, the designers ______ a new solution to a geological problem.
A. fell into
B. stumbled upon
C. set out
D. discovered

[单项选择]The writer would be less critical if fashion designers placed more stress on the ______ of clothing.


A. cost
B. appearance
C. comfort
D. suitability

[单选题]OSPF NSSA.区域的 ASBR 可以在区域内引入外部路由，但 NSSA.区域的 ABR 不 会区域内泛洪第四类和第五类 LSA，而是会将第七类 LSA.转换成第五类 LSA.泛洪 给其他区域
A.TRUE
B.FALSE

[单项选择]A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (26) , and that it has a mechanism for (27) graphical files. Display text, display graphics, and (28) hyperlinks-there’s 99 percent of the (29) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (30) for application development Remember frames and all their nasty side effects

A. plane
B. plant
C. plate
D. platform

[单项选择]OSPF和RIP都是Internet中的路由协议，与RIP相比，OSPF有许多优点，但（）项不是OSPF的优点。
A. 没有跳步数的限制
B. 更快的收敛性
C. 扩大了网络规模
D. 更低的路由开销

[单选题]OSPF协议中，通过划分区域减少网络中OSPF报文、邻居建立数量，其中骨干区域的区域号为：
A.0.0.0
B.0.0.1
C.0.0.2
D.0.0.3

[单选题]关于 OSPF 的 AS-External-LSA.中 LSA.头部信息描述错误的是:
A. Link State ID.表示日的网络地址。
B. Advertising Router 表示 ASBR 的 Router ID。
C.Net mask 表示目的网段的网络掩码。
D. Forwarding Address 永远为 0.0.0.0.

[单选题]下面关于 OSPF LSA .格式的描述，不正确的是:
A.LS age 字段表示 LSA .已经生存的时间,单位是秒。
B.Ls type 字段标识了 LSA .的格式和功能。
C.第一类 LSA .中 Advertising Routes 字段表示产生此 LSA .的路由器的 RouterID。
D.Ls sequence number 越小则 LSA .越新。

[单项选择]I must congratulate you ______ the excellent design of the new bridge.
A. with
B. of
C. at
D. on

[多选题]当前企业网络中常常会使用 OSPF 作为路由协议，那么在使用 OSPF 做路由协议的时
候，需要注意哪些问题？（多选）
A.确认骨干区域不会出现分裂的情况
B.确认在 OSPF 的选路规则下，网络是否会出现次优路由
C.确认所有的非骨干区域与骨干区域有正确可靠的链接
D.确认 OSPF 网络拓扑结构，保证 OSPF 在路由计算时不会出现环路
E.确认 OSPF 的 COST 能够正确反映百兆以上链路的真实带宽

[单选题]下面关于 OSPF 中的 ABR,描述错误的是:
A.ABR 上有多个 LSDB、ABR 为每一个区域维护一个 LSDB。
B.ABR 将连接的非骨干区域内的链路状态信息抽象成路由信息，发布到骨干区城 中。
C.ABR 也要将骨干区域的链略状态信息抽象成路由信息，并发布到所有的非骨干 区域。
D.ABR 能够产生 LSA3、LSA4 和 LSA5 类信息。