A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table.What will the router do in this situation?（）A. It will ignore the update and take no further action.B. It will add the update information to its routing table.C. It will replace the existing routing table entry with the update information.D. It will delete the existing routing table and will send out hello packets to rebuild the routing table.
A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table.What will the router do in this situation?（）
A. It will ignore the update and take no further action.
B. It will add the update information to its routing table.
C. It will replace the existing routing table entry with the update information.
D. It will delete the existing routing table and will send out hello packets to rebuild the routing table.
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阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the routers network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the routers routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table
下列对RIP的配置中，合法的命令是（）A.router rip 100 network 10.12.0.0B.router rip 100 network 10.0.0.0C.router rip network 10.12.0.0D.router rip 100 network 10.0.0.0
Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)A. Inspect the routing table to select the best path to the destination network addresses.B. Validate sources of routing information.C. Inspect the ARP table to verify a legitimate source MAC address for each packet.D. Identify the destination network address of each packet.E. Verify the receipt of routed packets by the next hop router.F. Identify the source network address of each packet.
To a router, a flow is a(66)of packets that share the same Characterstics, such as traveling the same(67),using the same(68),having the same kind of security, and so on. A router that supports the handling of flow labels has a(69)table. The table has an entry for each active flow label; each entry defines the(70)required by the corresponding flow label.A．sequenceB．streamC．QueuesD．flow
Refer to the exhibit and the partial configuration on router R2. On router R4 all RIP routes are redistributed into the OSPF domain. A second redistribu tion is configured on router R2 using a route map. Based on the configuration on router R2, which EIGRP external routes will be present in the routing table of R1?（）A. the routes originating from the RIP routing domainB. the routes originating from the OSPF stub areaC. all OSPF inter and intra - area routesD. all routes originating from RIP and OSPF routing domains
You have just configured a static default route on router TK1. What is the purpose of a default route?() A. It is a route to be used when the routing protocol fails.B. It is a route configured by an ISP that sends traffic into a corporate network.C. It is a route used when a packet is destined for a remote network that is not listed in the routing table.D. It is a route manually configured for a specific remote network for which a routing protocol is not configured.E. It is used to send traffic to a stub network.
Which of the following are shared distribution tree characteristics() A.Memory requirements are higher for shared distribution tree than for source distributiontree.B.Creates a tree from a central RP to all last-hoprouters.C.Uses a rendezvous point.D.An optimal path is created between each source router and each last-hoprouter.E.Place（S，G）entry in each router’smulticast routing table.F.Place（*，G）entry in a router’smulticast routing to 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
Open Shortest Path First (OSPF) was designed as an （请作答此空） 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 （ ）, 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.exteriorB.interiorC.borderD.routing
The Testking router is running both RIP and IGRP, and the same route is learned by this router from both of these methods. However, when you issue the command"show ip route" you see only the IGRP route, and not the RIP route. Why is this?（）A、IGRP has a faster update timer.B、IGRP has a lower administrative distance.C、RIP has a higher metric value for that route.D、The IGRP route has fewer hops.E、The RIP path has a routing loop.
A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782.The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?（）A、Router R2 will not form a neighbor relationship with R1.B、Router R2 will obtain a full routing table, including a default route, from R1.C、R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.D、R2 will not have a route for the directly connected serial network, but all other directly connected
Which two statements describe the forwarding table in the Junos OS?（）A、The forwarding table contains all known routes.B、The forwarding table stores a subset of information from the routing table.C、Junos devices use the forwarding table to compare incoming packets against existing entries to determine the next hop.D、If multiple matches exist, the forwarding table uses the least-specific entry to forward packets toward the destination.
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.
Which two statements are characteristics of a distance vector routing protocol?（）A、RIP is an example of distance vector routing protocols.B、Updates are periodic and include the entire routing table.C、Routing updates are sent only after topology changesD、The protocol can be useful in hub-and-spoke and hierarchical networks.E、Convergence is usually faster than with link state protocolsF、Each router has its own view of the topology
The routers named Testking1 and Testking2 are both configured with RIP only.What will happen in the event of Testking1 receiving a routing update that contains a higher cost path to a network already in its routing table?（）A、The update information will be added to the existing routing table.B、The update information will replace the existing routing table entry.C、The update will be ignored and thus no further action will occur.D、The existing routing table entry will be purged from the routing table and all routers will attempt convergence.
Which of the following are shared distribution tree characteristics？ （Choose all that apply.）（）A、Memory requirements are higher for shared distribution tree than for source distribution treeB、Creates a tree from a central RP to all last-hop routersC、Uses a rendezvous pointD、An optimal path is created between each source router and each last-hop routerE、Place （S，G） entry in each router’s multicast routing tableF、Place （*，G） entry in a router’s multicast routing to table
A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table. What will the router do in this situation?（）A、It will ignore the update and take no further action.B、It will add the update information to its routing table.C、It will replace the existing routing table entry with the update information.D、It will delete the existing routing table and will send out hello packets to rebuild the routing table.
What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?（）A、It routes all traffic that is addresses to the destination network to the interface indicates in the routing table.B、It sends a copy of its neighbor table to all adjacent routers.C、It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.D、It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.
You are designing a strategy to ensure that VPN users are able to access all internal resources. What should you do？（）A、 Specify a static routing table entry on VPN1 for the Dallas network.B、 Specify a static routing table entry on VPN1 for the Seattle network.C、 Implement Internet Authentication Service （IAS） on VPN1.D、 Define a User Class option for Routing Remote Access Clients on the DHCP Server.
You are a systems engineer for your company. Your company has 20，000 users in a large campus environment located in Los Angeles. Each department in the company is located in its own building. Each department has its own IT staff， which is responsible for all network administration within the building. The company’s network is divided into several IP subnets that are connected to one another by using dedicated routers. Each building on the company’s main campus contains at least one subnet， and possibly up to five subnets. Each building has at least one router. All routers use RIP version 2 （RIPv2） broadcasts. The company acquires a new business unit located in Denver. The Denver office has 25 users. The network in the Denver office is connected to the network at the main campus by using a leased frame relay connection. The network administrator at the Denver office installs a Windows Server 2003 computer and configures Routing and Remote Access on this server. The network administrator at the Denver office configures this server as a router and implements RIPv2 in Routing and Remote Access. Later， the Denver administrator reports that his router is not receiving routing table updates from the routers on the main campus network. He must manually add routing entries to the routing table to enable connectivity between the locations. You investigate and discover that the RIPv2 broadcasts are not being received at the Denver office. You also discover that no routing table announcements from the Denver office are being received on the main campus network. You need to ensure that the network in the Denver office can communicate with the main campus network and can send and receive automatic routing table updates as network conditions change. What should you do on the router in the Denver office？（）A、 Configure the router to use RIPv1 broadcasts.B、 Configure the router to use auto-static update mode.C、 Add the IP address ranges of the main campus network to the router’s Accept list and Announce list.D、 Add the IP addresses of the main campus routers to the router’s Neighbors list.
单选题What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?（）AIt routes all traffic that is addresses to the destination network to the interface indicates in the routing table.BIt sends a copy of its neighbor table to all adjacent routers.CIt sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.DIt broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.
多选题Which two statements describe the forwarding table in the Junos OS?（）AThe forwarding table contains all known routes.BThe forwarding table stores a subset of information from the routing table.CJunos devices use the forwarding table to compare incoming packets against existing entries to determine the next hop.DIf multiple matches exist, the forwarding table uses the least-specific entry to forward packets toward the destination.
单选题You have just configured a static default route on router TK1. What is the purpose of a default route?（）AIt is a route to be used when the routing protocol fails.BIt is a route configured by an ISP that sends traffic into a corporate network.CIt is a route used when a packet is destined for a remote network that is not listed in the routing table.DIt is a route manually configured for a specific remote network for which a routing protocol is not configured.EIt is used to send traffic to a stub network.
单选题The routers named Testking1 and Testking2 are both configured with RIP only.What will happen in the event of Testking1 receiving a routing update that contains a higher cost path to a network already in its routing table?（）AThe update information will be added to the existing routing table.BThe update information will replace the existing routing table entry.CThe update will be ignored and thus no further action will occur.DThe existing routing table entry will be purged from the routing table and all routers will attempt convergence.
多选题Your boss， Miss ，is interested in CEF. What should you tell her？ （）AThe FIB lookup is based on the Layer 3 destination address prefix （shortest match）.BThe adjacent table is derived from the ARP table.CThe FIB table is derived from the IP routing table.DWhen the adjacency table is full， a CEF TCAM table entry points to the Layer 3 engine to redirect the adjacency.ECEF IP destination prefixes are stored in the TCAM table， from the least specific to the most specific entry.FWhen the CEF TCAM table is full， packets are dropped.
单选题A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table. What will the router do in this situation?（）AIt will ignore the update and take no further action.BIt will add the update information to its routing table.CIt will replace the existing routing table entry with the update information.DIt will delete the existing routing table and will send out hello packets to rebuild the routing table.
多选题Which of the following are shared distribution tree characteristics（）AMemory requirements are higher for shared distribution tree than for source distributiontree.BCreates a tree from a central RP to all last-hoprouters.CUses a rendezvous point.DAn optimal path is created between each source router and each last-hoprouter.EPlace（S，G）entry in each router’smulticast routing table.FPlace（*，G）entry in a router’smulticast routing to table.
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.