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Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed?()

题目
Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed?()

A. show ip protocol

B. show ip ospf

C. sho w ip ospf database

D. show ip ospf interface

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相似问题和答案

第1题：

During OSPF adjacency formation, in which state is a router in when an OSPF hello packet has been sent but bi－directional communication has not been achieved?()

A.A

B.B

C.C

D.D


参考答案：A

第2题：

Open Shortest Path First (OSPF) was designed as an （ ） gateway protocol, for use in an autonomous system such as a local area network (LAN). It implements Dijkstra's algorithm, also known as the （ ） path first algorithm. As a link-state routing protocol it was based on the link-state algorithm developed for the ARPANET in 1980 and the IS-IS routing protocol. OSPF was first standardised in 1989 as RFC 1131, which is now known as OSPF version 1.Routing protocols like OSPF calculate the shortest route to a destination through the network based on an algorithm. The first routing protocol that was widely implemented, the （请作答此空）, calculated the shortest route based on hops, that is the number of routers that an IP packet had to traverse to reach the destination host. RIP successfully implemented dynamic routing, where routing tables change if the network topology changes. But RIP did not adapt its routing according to changing network conditions, such as data-transfer rate. Demand grew for a dynamic routing protocol that could calculate the fastest route to a destination. （ ） was developed so that the shortest path through a network was calculated based on the cost of the route, taking into account bandwidth, delay and load. Therefore OSPF undertakes route cost calculation on the basis of link-cost parameters, which can be weighted by the administrator. OSPF was quickly adopted because it became known for reliably calculating routes through large and complex local area networks.As a link state routing protocol, OSPF maintains link state （ ）, which are really network topology maps, on every router on which it is implemented. The state of a given route in the network is the cost, and OSPF algorithm allows every router to calculate the cost of the routes to any given reachable destination. Unless the administrator has made a configuration, the link cost of a path connected to a router is determined by the bit rate (1 Gbit/s, 10 Gbit/s, etc) of the interface. A router interface with OSPF will then advertise its link cost to neighbouring routers through multicast, known as the hello procedure. All routers with OSPF implementation keep sending hello packets, and thus changes in the cost of their links become known to neighbouring routers. The information about the cost of a link, that is the speed of a point to point connection between two routers, is then cascaded through the network because OSPF routers advertise the information they receive from one neighbouring router to all other neighbouring routers. This process of flooding link state information through the network is known as synchronisation. Based on this information, all routers with OSPF implementation continuously update their link state databases with information about the network topology and adjust their routing tables.OSPF has become a popular dynamic routing protocol. Other commonly used dynamic routing protocols are the RIP and the Border Gateway Protocol (BGP). Today routers support at least one interior gateway protocol to advertise their routing tables within a local area network. Frequently implemented interior gateway protocols besides OSPF are RIP, IS-IS, and the proprietary Interior Gateway Routing Protocol (IGRP) by Cisco.

A.OSPF
B.RIP
C.IS-IS
D.EIGRP

答案：B
解析：

第3题：

根据下面的文字资料回答 71～75 题 n the following essay，each blank has four choices．Choose the most suitable one from the four choices and write down in the answer sheet．

Open Shortest Path First(OSPF)is a（ 1 ）routing algorithm that（ 2 ）work done on the OSI IS-IS intradomain routing protocol．This routing，as compared to distance-vector routing，requires（ 3 ）processing power．The Dijkstra algorithm is used to calculate（ 4 ）OSPF routing table updates only take place when necessary，（ 5 ）at regular intervals．

第6题：文中（ 1 ）处正确的答案是（ ）。

A．distance-vector

B．link-state

C．flow-based

D．selective flooding


正确答案：B
OSPF(Open Shortest Path First)是一个内部网关协议(Interior Gateway Protocol，IGP)，用于在单一自治系统(Autonomous System，AS)内决策路由。与RIP相对，OSPF是链路状态路由协}义，而RIP是距离矢量路由协议。
链路是路由器接口的另一种说法，因此oSPF也称为接口状态路赢协议。0SPF通过路由器之间通告网络接口的状态来建立链路状态数据库，生成最短路径树，每个0SPF路由器使用这些最短路径构造路由表。

第4题：

Which statement is true about a routing table?（）

  • A、It contains routers learned dynamically only
  • B、It finds the best path to each destination by using a modified shortest-path-first calculation
  • C、It contains only active BGP routes
  • D、It contains all accepted routes to all destinations

正确答案:D

第5题：

The command "clear ipv6 ospf process" was issued on a router. What does this commandaccomplish？（）

  • A、The route table is cleared. Then the OSPF neighbors are reformed
  • B、The OSPF adjacencies are cleared and initiated again
  • C、The OSPF database is repopulated and then the shortest path first （SPF） algorithm isperformed.
  • D、The shortest path first （SPF） algorithm is performed on the LSA database
  • E、None of the other alternatives apply

正确答案:C

第6题：

Which command displays the results of a loopback test you executed on a CT3 line module in slot 5, port 0, t1 number 4?()

A.A

B.B

C.C

D.D


参考答案：C

第7题：

What does the command clear ipv6 ospf process accomplish?（）

  • A、The shortest path first (SPF) algorithm is performed on the LSA database.
  • B、The OSPF adjacencies are cleared and initiated again.
  • C、The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.
  • D、The route table is cleared. Then the OSPF neighbors are reformed.

正确答案:C

第8题：

View the Exhibit to examine the error during the database startup.You open an RMAN session for the database instance. To repair the failure, you executed the following as the first command in the RMAN session:RMAN> REPAIR FAILURE;Which statement describes the consequence of the command?（）

A. The command performs the recovery and closes the failures.

B. The command only displays the advice and the RMAN script required for repair.

C. The command produces an error because the ADVISE FAILURE command has not been executed before the REPAIR FAILURE command.

D. The command executes the RMAN script to repair the failure and removes the entry from the Automatic Diagnostic Repository (ADR).


参考答案：C

第9题：

A router has two paths to reach another network in a different autonomous system. Neither route was generated by the local router and both routes have the same default weight an d local preference values. Which statement is true about how BGP would select the best path?（）

  • A、To influence one route to be preferred, its default local preference value will be changed via the use of the command bgp default local - preference 50
  • B、Th e router will prefer the shortest autonomous system path
  • C、If the command bgp always - compare - med has been given, then the router will prefer the route with the highest MED
  • D、The router will prefer the route with the lower MED

正确答案:B

第10题：

Why does IS-IS use the SPF algorithm?（）

  • A、to determine the pseudonode ID
  • B、to determine the next hop to a given destination
  • C、to determine the complete path to a given destination
  • D、to determine the number of routers present in a given area

正确答案:B

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