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单选题
What is the default metric used on IS -IS routers for each interface?（）
A
The cost is set to 10 for all interfaces.
B
The cost is set to 10 for LAN interfaces and 20 for WAN interfaces.
C
The cost is based on the speed of the interface.
D
The cost is based o n a composite of bandwidth and delay of the interface.
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考题
What is the meaning of the default value of the EIGRP variance command of 1? ()
A. Only the path that is the feasible successor should be used.B. Load balancing is disabled on t his router.C. The router only performs equal - cost load balancing on all paths that have a metric greater than 1D. The router performs equal - cost load balancing.
考题
What is the default metric used on IS －IS routers for each interface?()
A. The cost is set to 10 for all interfaces.B. The cost is set to 10 for LAN interfaces and 20 for WAN interfaces.C. The cost is based on the speed of the interface.D. The cost is based o n a composite of bandwidth and delay of the interface.
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Refer to the exhibit.The actual speed of the serial links between R2 and R3 are 256 kb/s and 512k b/s respectively. When configuring EIGRP on routers R2 and R3, the network administrator configured the bandwidth of both serial interfaces to 512 kb/s. What will be the effect?（）A. EIGRP will overutilize the 512 kb/s link.B. The interface delay value used in the EIGRP metric calculation will be inaccurate on the 256k b/s serial interface.C. The amount of bandwidth used for EIGRP routing protocol traffic on the 256 kb/s link can become excessive.D. EIGRP can load balance between the two serial links only if the variance is set to 2 or higher.E. Unequal cost load balancing will be disabled.
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考题
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
考题
Traditional network layer packet forwarding relies on the information provided by network layer（ ）protocols,or static routing,to make an independent forwarding decision at each（本题）within the network．The forwarding decision is based solely on the destination（ ）IP address．All packets for the same destination follow the same path across the network if no other equal-cost（ ）exist．Whenever a router has two equal-cost pathstoward a destination,the packets toward the destination might take one or both of them,resulting in some degree of load sharing．Enhanced Interior Gateway Routing Protocol（EIGRP）also supports non-equal-cost（ ）sharing although the default behavior of this protocol is equal-cost．You must configure EIGRP variance for non-equal-cost load balancing．A.switch
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D.customer
考题
Which two statements about spanning tree path cost are true？（）A、The path cost can be changed for an interface using the spanning-tree cost commandB、The path cost can be changed for an interface using the stp path-cost commandC、The SPT default path cost depends on the interface speedD、The STP default path cost is similar for all interface
考题
To make OSPF area 4 totally stubby, the following command was issued on the ABR in router configuration mode: area 4 stub.Which two things need to be done to finish making area 4 a totally stubby area?（）A、Apply the area 4 stub command to all routers in the areaB、On the ABR, use the area 4 stub command with the no - summary keywordC、On the ABR, specify a default cost for the area with the area default - cost commandD、On the ABR, use the default - information originate command to inject a default route into area 4E、Use the auto - cost command on each router in the area to automatically determine the cost to other OSPF areas
考题
What is the default metric used on IS -IS routers for each interface?（）A、The cost is set to 10 for all interfaces.B、The cost is set to 10 for LAN interfaces and 20 for WAN interfaces.C、The cost is based on the speed of the interface.D、The cost is based o n a composite of bandwidth and delay of the interface.
考题
Which two are characteristics of link-state routing protocols?（） (Choose two.)A、Routers choose a best path for a destination based on the SPF algorithm.B、All routers in a given area or level build a consistent database describing the network's topology.C、Routers choose the best path for a destination based on the interface on which they received the link stateadvertisement with the lowest cost.D、All routers in a given area or level forward link state advertisements between interfaces in the same area or level, adding their metric to the link state advertisement's cost information when they forward it.
考题
What is the meaning of the default value of the EIGRP variance command of 1? （）A、Only the path that is the feasible successor should be used.B、Load balancing is disabled on t his router.C、The router only performs equal - cost load balancing on all paths that have a metric greater than 1D、The router performs equal - cost load balancing.
考题
Spanning Tree Protocol calculates path cost based on which of these？ （）A、 interface bandwidthB、 interface delayC、 interface bandwidth and delayD、 hop countE、 bridge priority
考题
By default, which of the following factors determines the spanning-tree path cost?（）A、It is the individual link cost based on latencyB、It is the sum of the costs based on bandwidthC、It is the total hop countD、It is dynamically determined based on load
考题
Which two commands would change the default OSPF metric calculation for interface ge-0/3/0 inJUNOS software?（）A、set interfaces ge-0/3/0 unit 0 metric 10B、set protocols ospf reference-bandwidth 10gC、set interfaces ge-0/3/0 unit 0 bandwidth 10gD、set protocols ospf area 0 interface ge-0/3/0 metric 10E、set protocols ospf area 0 interface ge-0/3/0 bandwidth 10g
考题
单选题How is the cost of a virtual link in OSFP calculated？（）A
Takes the metric of the outgoing interface.B
Uses the metric that is assigned during configuration.C
Uses the path metric to reach the virtual neighbor.D
Uses a default of zero unless otherwise specified.
考题
多选题Which two statements about spanning tree path cost are true？（）AThe path cost can be changed for an interface using the spanning-tree cost commandBThe path cost can be changed for an interface using the stp path-cost commandCThe SPT default path cost depends on the interface speedDThe STP default path cost is similar for all interface
考题
单选题What is the meaning of the default value of the EIGRP variance command of 1? （）A
Only the path that is the feasible successor should be used.B
Load balancing is disabled on t his router.C
The router only performs equal - cost load balancing on all paths that have a metric greater than 1D
The router performs equal - cost load balancing.
考题
单选题Spanning Tree Protocol calculates path cost based on which of these？ （）A
interface bandwidthB
interface delayC
interface bandwidth and delayD
hop countE
bridge priority
考题
单选题By default, which of the following factors determines the spanning-tree path cost?（）A
It is the individual link cost based on latencyB
It is the sum of the costs based on bandwidthC
It is the total hop countD
It is dynamically determined based on load
考题
多选题Which two are characteristics of link-state routing protocols?（） (Choose two.)ARouters choose a best path for a destination based on the SPF algorithm.BAll routers in a given area or level build a consistent database describing the network's topology.CRouters choose the best path for a destination based on the interface on which they received the link stateadvertisement with the lowest cost.DAll routers in a given area or level forward link state advertisements between interfaces in the same area or level, adding their metric to the link state advertisement's cost information when they forward it.
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