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

承力索断线抢修后，应对整锚段进行巡视测量，特别要注意中心锚结、线岔、绝缘锚段关节等处是否达到要求。