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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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更多 “ Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed?() A. show ip protocolB. show ip ospfC. sho w ip ospf databaseD. show ip ospf interface ” 相关考题
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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-vectorB．link-stateC．flow-basedD．selective flooding
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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.AB.BC.CD.D
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A.AB.BC.CD.D
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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
考题
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.
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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 reformedB、The OSPF adjacencies are cleared and initiated againC、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 databaseE、None of the other alternatives apply
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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 50B、Th e router will prefer the shortest autonomous system pathC、If the command bgp always - compare - med has been given, then the router will prefer the route with the highest MEDD、The router will prefer the route with the lower MED
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Which statement is true about a routing table?（）A、It contains routers learned dynamically onlyB、It finds the best path to each destination by using a modified shortest-path-first calculationC、It contains only active BGP routesD、It contains all accepted routes to all destinations
考题
Why does IS-IS use the SPF algorithm?（）A、to determine the pseudonode IDB、to determine the next hop to a given destinationC、to determine the complete path to a given destinationD、to determine the number of routers present in a given area
考题
OSPF协议使用的算法是（）A、最短路径优先（Shortest Path First，SPF）算法B、Bellman-Ford算法C、路径向量（Path-Vector）算法D、最小生成树算法
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An Enterprise rou ter, Ent1, displays the following excerpt from the show ip bgp command. ENT1 has an eBGP connection to an ISP router with address 3.3.3.3 and an iBGP connection to a router with address 4.4.4.4. Which of the following is most likely to be true?（） Network Next Hop Metric LocPrf Weight Path * 3.3.3.3 0 0 1 1 1 1 2 18 iA、The Enterprise likely uses ASN 1.B、The neighboring ISP likely uses ASN 1.C、The route has been advertised through ASN 1 multiple times.D、Router Ent1 will add another ASN to the AS_Path before advertising this route to its iBGP peer (4.4.4.4).
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You have a multi-area OSPF network and you’re concerned because one of the sites is havingconnectivity problem to resources in a different area. Which IOS privileged mode command wouldyou enter to confirm that your network： （A） has a path to its ABR， （B） has a path to its ASBR， and （C）the SPF calculation is functional？（）A、show ip protocolsB、show running-configC、show ip ospf neighborD、show ip ospf border-routers
考题
Which of the following commands displays the number of system calls per second that are being executed？（）A、 sarB、 pstatC、 iostatD、 filemon
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Which command displays the number of packets transmitted for each NIC available on the system？（）A、entstat -vB、netstat -iC、entstat -aonD、netstat -na
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You executed the following command in Recovery Manager （RMAN）： RMAN REPORT NEED BACKUP days 3； What is the output of this command？（） A、 a list of files that require a backup within three daysB、 a list of files requiring more than 3 days of archive logs to applyC、 a list of files that RMAN recommends be backed up only once in every three days，based on low volatilityD、 a list of files for which a backup has already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them
考题
单选题Which of the following commands displays the number of system calls per second that are being executed？（）A
sarB
pstatC
iostatD
filemon
考题
单选题Which CLI command displays all OSPF LSAs received by the local router？（）A
show ospf neighborB
show ospf databaseC
show ospf interfaceD
show ospf adjacency
考题
单选题You executed the following command in Recovery Manager （RMAN）： RMAN REPORT NEED BACKUP days 3； What is the output of this command？（）A
a list of files that require a backup within three daysB
a list of files requiring more than 3 days of archive logs to applyC
a list of files that RMAN recommends be backed up only once in every three days，based on low volatilityD
a list of files for which a backup has already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them
考题
单选题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 reformedB
The OSPF adjacencies are cleared and initiated againC
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 databaseE
None of the other alternatives apply
考题
单选题You have amulti-area OSPF network and you’re concerned because one of the sites is having connectivity problem to resources in a different area. Which IOS privileged mode command would you enter to confirm that your network ：A.has a path to itsABR，B.has a path to itsASBR，and C.the SPF calculation is functional（）A
show ip protocolsB
show running-configC
show ip ospfneighborD
show ip ospfborder-routers
考题
单选题An Enterprise rou ter, Ent1, displays the following excerpt from the show ip bgp command. ENT1 has an eBGP connection to an ISP router with address 3.3.3.3 and an iBGP connection to a router with address 4.4.4.4. Which of the following is most likely to be true?（） Network Next Hop Metric LocPrf Weight Path * 3.3.3.3 0 0 1 1 1 1 2 18 iA
The Enterprise likely uses ASN 1.B
The neighboring ISP likely uses ASN 1.C
The route has been advertised through ASN 1 multiple times.D
Router Ent1 will add another ASN to the AS_Path before advertising this route to its iBGP peer (4.4.4.4).
考题
单选题Why does IS-IS use the SPF algorithm?（）A
to determine the pseudonode IDB
to determine the next hop to a given destinationC
to determine the complete path to a given destinationD
to determine the number of routers present in a given area
考题
单选题Which command displays the number of times that the OSPF Shortest Path First (SPF) algorithm has been executed?（）A
show ip protocolB
show ip ospfC
sho w ip ospf databaseD
show ip ospf interface
考题
单选题OSPF协议使用的算法是（）A
最短路径优先（Shortest Path First，SPF）算法B
Bellman-Ford算法C
路径向量（Path-Vector）算法D
最小生成树算法
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