How does route poisoning work with holddown timers to prevent routing loops?（）A、Information learned from one source is not distributed back to that source.B、Routing updates from the poisoned source are ignored until a holddown timer expires.C、Failed route

题目

How does route poisoning work with holddown timers to prevent routing loops?（）

  • A、Information learned from one source is not distributed back to that source.
  • B、Routing updates from the poisoned source are ignored until a holddown timer expires.
  • C、Failed routes are advertised with infinite metrics.
  • D、New routing updates are ignored until the network has converged.
  • E、A route is marked as unavailable when its time-to-live is exceeded.
相似考题

1.Which routing algorithm is described below?It is a mechanism in which the sending station determines the route the frame. will follow andincludes the routing information with the flame；bridges read the routing information to determineif they should forward the frame．A．Fixed RoutingB．Spanning TreeC．Source RoutingD．Frame. Forwarding

2.Split horizon has been enabled within the Ezonexam routed network. Which one of the following statements best explains the split horizon rule?A．Only routers can split boundaries (horizons) between networks in separate AS numbers.B．Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.C．Once a route is received on an interface, advertise that route as unreachable back out the same interface.D．Information about a route should never be sent back in the direction from which the original update came.E．None of the above

3.Which option is true regarding the synchronization rule ?()A. Do not use or internally advertise a route until the route is lear ned from a source other than BGP.B. Do not use or advertise a route until the route is learned from a BGP peer.C. Do not use or advertise routes marked PARTIAL.D. Wait until a CONFIRM message is received before using routes from BGP neighbors.

4.When you display the routing table by entering the show route command, what does the* indicate?()A.The route is a direct route.B.The route was selected as active.C.The route is a default route.D.The route was learned using a dynamic routing protocol.

参考答案和解析
正确答案:C
更多“How does route poisoning work with holddown timers to prevent routing loops?（）A、Information learned from one source is not distributed back to that source.B、Routing updates from the poisoned source are ignored until a holddown timer expires.C、Failed route”相关问题

  • 第1题：

    How does route poisoning work with holddown timers to prevent routing loops?()

    A. Information learned from one source is not distributed back to that source.

    B. Routing updates from the poisoned source are ignored until a holddown timer expires.

    C. Failed routes are advertised with infinite metrics.

    D. New routing updates are ignored until the network has converged.

    E. A route is marked as unavailable when its time-to-live is exceeded.


    参考答案：C

  • 第2题：

    Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?()

    A. Only routers can split boundaries (horizons) between concentric networks.

    B. Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.

    C. Networks can only remain fully converged if all information is sent out all active interfaces.

    D. Information about a route should not be sent back in the direction from which the original update came.

    E. Distance vector protocols need fall back routers that are responsible for momentary loops.


    参考答案：D

  • 第3题：

    Which statement describes the rule of split horizon?()

    A. Only router can split boundaries(horizons)between concentric networks.

    B. All distance vector protocols require fall routes that may cause momentary loops as the topology changes.

    C. Networks can only remain fully converged if all information about routes is sent out all active interfaces.

    D. Information about a route should not be sent back in the direction from which the original update came.

    E. Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.


    参考答案：D

  • 第4题：

    Which two statements are true regarding EIGRP?()

    A. Passiveroutes are in the process of being calculated by DUAL.

    B. EIGRP supports VLSM, route summarization, and routing update authentication.

    C. EIGRP exchanges full routing table information with neighboring routers with every update.

    D. If the feasible successor has a higher advertised distance than the successor route, it becomes the primary route.

    E. A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.


    参考答案：B, E

  • 第5题：

    Which one of the following statements best explains the split horizon rule?（）

    • A、Only routers can split boundaries (horizons) between networks in separate AS numbers.
    • B、Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
    • C、Once a route is received on an interface, advertise that route as unreachable back out the same interface.
    • D、Information about a route should never be sent back in the direction from which the original update came.

    正确答案:D

  • 第6题：

    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

    正确答案:B

  • 第7题：

    Which three statements about the route target （RT） are true？ （）

    • A、The RT is a BGP extended community.
    • B、The RT is an 8-byte field that is prefixed to an IPv4 address to make it a unique VPNv4 address.
    • C、When a VPN route that is learned from a CE router is injected into BGP， one or more RTs are associated with it
    • D、The distribution of VPN routing information is controlled through the use of VPN RTs
    • E、When a VPN route that is learned from a CE router is injected into BGP， there is always one RT that is associated with it.

    正确答案:A,C,D

  • 第8题：

    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、the OSPF route
    • B、the EIGRP route
    • C、the RIPv2 route
    • D、all three routes
    • E、the OSPF and RIPv2 routes

    正确答案:B

  • 第9题：

    单选题
    When you display the routing table by entering the show route command, what does the* indicate?（）
    A

    The route is a direct route.

    B

    The route was selected as active.

    C

    The route is a default route.

    D

    The route was learned using a dynamic routing protocol.


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    Which one of the following statements best explains the split horizon rule?（）
    A

    Only routers can split boundaries (horizons) between networks in separate AS numbers.

    B

    Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.

    C

    Once a route is received on an interface, advertise that route as unreachable back out the same interface.

    D

    Information about a route should never be sent back in the direction from which the original update came.


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    How does route poisoning work with holddown timers to prevent routing loops?（）
    A

    Information learned from one source is not distributed back to that source.

    B

    Routing updates from the poisoned source are ignored until a holddown timer expires.

    C

    Failed routes are advertised with infinite metrics.

    D

    New routing updates are ignored until the network has converged.

    E

    A route is marked as unavailable when its time-to-live is exceeded.


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    A router has EIGRP configured as the only routing protocol. How does EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?（）
    A

    It immediately sends its entire routing table to its neighbors.

    B

    EIGRP sends a Hello packet to the DR to inform it of the route failure.

    C

    It automatically forwards traffic to a fallback default route until a successor route is found.

    D

    It sends queries out to neighbors until a new successor route is found.

    E

    It places the route in holddown until LSA updates inform it of a new route to the network.


    正确答案： C
    解析： 暂无解析

  • 第13题：

    A router has EIGRP configured as the only routing protocol. How does EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?()

    A. It immediately sends its entire routing table to its neighbors.

    B. EIGRP sends a Hello packet to the DR to inform it of the route failure.

    C. It automatically forwards traffic to a fallback default route until a successor route is found.

    D. It sends queries out to neighbors until a new successor route is found.

    E. It places the route in holddown until LSA updates inform it of a new route to the network.


    参考答案：D

  • 第14题：

    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.


    参考答案：B

  • 第15题：

    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. the OSPF route

    B. the EIGRP route

    C. the RIPv2 route

    D. all three routes

    E. the OSPF and RIPv2 routes


    参考答案：B

  • 第16题：

    Which statement describes the rule of split horizon?（）

    • A、Only routers can split boundaries (horizons) between concentric networks.
    • B、All distance vector protocols require fall back routers that may cause momentary loops as the topology changes.
    • C、Networks can only remain fully converged if all information about routers is sent out all active interfaces.
    • D、Information about a route should not be sent back in the direction from which the original update come.
    • E、Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.

    正确答案:D

  • 第17题：

    In BGP routing，what does the rule of synchronization mean？（）

    • A、A BGP router can only advertise an EBGP learned route，provided that the route is an IGP route in the routing table.
    • B、A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route in the routing table.
    • C、A BGP router can only advertise an IBGP learned route，provided that the route is an IGP route that is not in the routing table.
    • D、A BGP router can only advertise an EBGP learned route，provided that the route is a metric of 0 in the BGP table.

    正确答案:B

  • 第18题：

    When you display the routing table by entering the show route command, what does the* indicate?（）

    • A、The route is a direct route.
    • B、The route was selected as active.
    • C、The route is a default route.
    • D、The route was learned using a dynamic routing protocol.

    正确答案:B

  • 第19题：

    What is the BGP synchronization rule？（）

    • A、Routing information received through an IBGP session is not forwarded to another IBGP neighbor， onlyto EBGP neighbors
    • B、Routing information received through an EBGP session is not forwarded to another EBGP neighbor，only to IBGP neighbors
    • C、BGP neighbor peerings are established and sychronized using the TCP 3-way handshake
    • D、BGP shall not advertise a route until that route has been learned via an IGP also

    正确答案:D

  • 第20题：

    If the PFE does not have a route to the destination address of a packet, which action will be taken?（）

    • A、The PFE floods the packet out of all interfaces.
    • B、The PFE drops the packet and sends a destination unreachable notification back to source device.
    • C、The PFE forwards the packet to the routing engine for furtherprocessing.
    • D、The PFE queues the packet and sends are quest for a layer3 lookup to the routing engine.

    正确答案:B

  • 第21题：

    单选题
    Which one of the following statements best explains the split horizon rule used in distance vector routing protocols?（）
    A

    Only routers can split boundaries (horizons) between concentric networks.

    B

    Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.

    C

    Networks can only remain fully converged if all information is sent out all active interfaces.

    D

    Information about a route should not be sent back in the direction from which the original update came.

    E

    Distance vector protocols need fall back routers that are responsible for momentary loops.


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Which statement describes the rule of split horizon?（）
    A

    Only routers can split boundaries (horizons) between concentric networks.

    B

    All distance vector protocols require fall back routers that may cause momentary loops as the topology changes.

    C

    Networks can only remain fully converged if all information about routers is sent out all active interfaces.

    D

    Information about a route should not be sent back in the direction from which the original update come.

    E

    Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    In BGP routing， what does the rule of synchronization mean？（）
    A

    A BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table.

    B

    A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table.

    C

    A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table.

    D

    A BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.


    正确答案： B
    解析： 暂无解析

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