Routers A and B have an OC12c and a GE link between them and are running OSPF over both ofthese links. Which statement is correct, assuming the default JUNOS software OSPF metric calculation?（）A、There are two equal cost paths betweena and b.B、Thege link is the preferred path betweena and b.C、The oc12c link is the preferred path betweena and b.D、Manual metric assignment must be configured to determine the outcome
Routers A and B have an OC12c and a GE link between them and are running OSPF over both ofthese links. Which statement is correct, assuming the default JUNOS software OSPF metric calculation?（）
- A、There are two equal cost paths between a and b.
- B、The ge link is the preferred path between a and b.
- C、The oc12c link is the preferred path between a and b.
- D、Manual metric assignment must be configured to determine the outcome
相关考题：
How is the cost of a virtual link in OSPF 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 link neighbor.D. Uses a default of zero unless otherwise specified.
You are running OSPF between two ERX Edge Routers across an OC－12c link with HDLC encapsulation.How many designated routers are present for this link?() A.0B.1C.2D.3
Refer to the exhibit. Router B and router C are performing mutual redistribution between OSPF and EIGRP, and their default metrics are configured the same. Router D has equal cost paths to networks where both paths are not r eally equal cost. For example, network 172.16.54.0 shows equal cost through both router B and router C, though in reality the cost is greater using router C. Other routers, though not shown, are connected to the 172.16.54.0 and 172.16.55.0 networks, and the same issues exist to those routers and the networks connected to them. What can be done so that data will be routed along the most optimal path in the network? （）A. Redistribute connected interfaces on router B and router CB. Set the maximum nu mber of equal cost paths to1 in all routersC. When redistributing EIGRP into OSPF, set the external metric type to type E1D. Adjust the default metrics in router B and router C so that the values are different in each routerE. None of these solut ions will fix the problem. Migrate to a single dynamic routing protocol
How will router A choose a path to the 10.1.2.0／24 network when different routing protocols are configured (Choose three.)()。 A.If RIPv2 is the routing protocol, only the path AD will be installed in the routing table by default.B.If RIPv2 is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.C.If EIGRP is the routing protocol, only the path AD will be installed in the routing table by default.D.If EIGRP is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.E.If EIGRP and OSPF are both running on the network, the EIGRP paths will be installed in the routing table.F.If EIGRP and OSPF are both running on the network, the OSPF paths will be installed in the routing table.
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.OSPFB.RIPC.IS-ISD.EIGRP
If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）A、A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor linkB、A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchangedC、A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor doorD、A SHAM link is part of OSPF network of MPLS-VPN provider
Which statement is correct about an OSPF sham-link？（）A、A sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.B、A sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.C、A sham-link is a logical link between PE routers that carries OSPF LSAs and forwards customer traffic across it.D、A sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.E、A sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.
When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers?（）A、OSPF process IDB、OSPF router IDC、OSPF network typeD、OSPF memory usageE、OSPF CPU utilizationF、OSPF stub area configurations
You have two EBGP peers connected via two parallel serial lines. What should you do to be able to load-balance between two EBGP speakers over the parallel serial lines in both directions？ （）A、nothing，BGP automatically load-balances the traffic between different autonomous systems on all available linksB、peer between the eBGP speaker’s loopbacks， configuring eBGP multihop as required， and use an IGP to load-share between the two equal-cost paths between the loopback addressesC、configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the EBGP peer loopback address；it is also necessary to use the next-hop-self commandD、use the ebgp-load-balance command on the neighbor statement on both sidesE、configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the peer loopback address；it is also necessary to use the ebgp-multihop and next-hop-self commands
Which two statements are correct regarding default protocol preference values?（）A、RIP is preferred over OSPF external routes.B、Direct, local, and static routes have the same preference value.C、OSPF's preference value is lower than BGP.D、OSPF has a single preference value for both internal and external routes.
Which two commands would change the default OSPF metric calculation for interface ge-0/3/0 in JUNOS 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 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
You are running OSPF between two ERX Edge Routers across an OC-12c link with HDLC encapsulation. How many designated routers are present for this link?（）A、0B、1C、2D、3
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.
Which two statements are correct regarding the default protocol preference values? （）A、RIP is preferred over OSPF external routesB、Direct, local and static routes have the same preference valueC、OSPF's preference value is lower than BGPD、OSPF has a single preference value for both internal and external routes
Which two statements are correct regarding default protocol preference values?（）A、OSPF has a single preference value for both internal and external routes.B、RIP is preferred over OSPF external routes.C、Direct, local, and static routes have the same preference value.D、OSPF's preference value is lower than BGP (both IBGP and EBGP).
How is the cost of a virtual link in OSPF 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 link neighbor.D、Uses a default of zero unless otherwise specified.
Routers A and B have an OC12c and a GE link between them and are running OSPF over both of these links.Which item is correct， assuming the default JUNOS software OSPF metric calculation？（）A、There are two equal cost paths between A and BB、The GE link is the preferred path between A and BC、The OC12c link is the preferred path between A and BD、Manual metric assignment must be configured to determine the outcome.
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
单选题Routers A and B have an OC12c and a GE link between them and are running OSPF over both ofthese links. Which statement is correct, assuming the default JUNOS software OSPF metric calculation?（）AThere are two equal cost paths betweena and b.BThege link is the preferred path betweena and b.CThe oc12c link is the preferred path betweena and b.DManual metric assignment must be configured to determine the outcome
单选题How is the cost of a virtual link in OSPF calculated?（）ATakes the metric of the outgoing interface.BUses the metric that is assigned during configuration.CUses the path metric to reach the virtual link neighbor.DUses a default of zero unless otherwise specified.
单选题You are running OSPF between two ERX Edge Routers across an OC-12c link with HDLC encapsulation. How many designated routers are present for this link?（）A0B1C2D3
多选题If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）AA sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor linkBA sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchangedCA SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor doorDA SHAM link is part of OSPF network of MPLS-VPN provider
多选题Which two commands would change the default OSPF metric calculation for interface ge-0/3/0 in JUNOS software？（）Aset interfaces ge-0/3/0 unit 0 metric 10Bset protocols ospf reference-bandwidth 10gCset interfaces ge-0/3/0 unit bandwidth 10gDset protocols ospf area 0 interface ge-0/3/0 metric 10Eset protocols ospf area 0 interface ge-0/3/0 bandwidth 10g
单选题Which statement is correct about an OSPF sham-link？（）AA sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.BA sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.CA sham-link is a logical link between PE routers that carries OSPF LSAs and forwards customer traffic across it.DA sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.EA sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.
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.
多选题Which two commands would change the default OSPF metric calculation for interface ge-0/3/0 inJUNOS software?（）Aset interfaces ge-0/3/0 unit 0 metric 10Bset protocols ospf reference-bandwidth 10gCset interfaces ge-0/3/0 unit 0 bandwidth 10gDset protocols ospf area 0 interface ge-0/3/0 metric 10Eset protocols ospf area 0 interface ge-0/3/0 bandwidth 10g
多选题How will router A choose a path to the 10.1.2.0/24 network when different routing protocols are configured (Choose three.)（）。AIf RIPv2 is the routing protocol, only the path AD will be installed in the routing table by default.BIf RIPv2 is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.CIf EIGRP is the routing protocol, only the path AD will be installed in the routing table by default.DIf EIGRP is the routing protocol, the equal cost paths ABD and ACD will be installed in the routing table by default.EIf EIGRP and OSPF are both running on the network, the EIGRP paths will be installed in the routing table.FIf EIGRP and OSPF are both running on the network, the OSPF paths will be installed in the routing table.