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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
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 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.” 相关考题
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How does route poisoning work with holddown timers to prevent routing loops?()
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Which statement describes the rule of split horizon?()
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Which two statements are true regarding EIGRP?()
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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.
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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.
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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.
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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
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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.
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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 itD、The distribution of VPN routing information is controlled through the use of VPN RTsE、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.
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What is the BGP synchronization rule？（）A、Routing information received through an IBGP session is not forwarded to another IBGP neighbor， onlyto EBGP neighborsB、Routing information received through an EBGP session is not forwarded to another EBGP neighbor，only to IBGP neighborsC、BGP neighbor peerings are established and sychronized using the TCP 3-way handshakeD、BGP shall not advertise a route until that route has been learned via an IGP also
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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 routeB、the EIGRP routeC、the RIPv2 routeD、all three routesE、the OSPF and RIPv2 routes
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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.
考题
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.
考题
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.
考题
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.
考题
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.
考题
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.
考题
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.
考题
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.
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