单选题In IS-IS, how long will the restart helper keep the restarting router in the up state?（）Auntil the hello dead timer expiresBuntil the restart duration timer expiresCuntil the restarting router sets the down bitDuntil the restart helper sends out three CSNPs
单选题
In IS-IS, how long will the restart helper keep the restarting router in the up state?（）
A
until the hello dead timer expires
B
until the restart duration timer expires
C
until the restarting router sets the down bit
D
until the restart helper sends out three CSNPs
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单选题What is the purpose of the RSVP hello interval?（）AIt is the size of the RSVP hello packetBIt is how long it maintains RSVP neighborsCIt is the length of time between RSVP hello packetsDIt is how long the router waits before declaring a router to be down
单选题In IS-IS， how long will the restart helper keep the restarting router in the up state？（）AThe hello dead timer expires.BThe restart duration timer expires.CThe restarting router sets the down bit.DThe restart helper sends out three CSNPs.
单选题In IS-IS, how long will the restart helper keep the restarting router in the up state?（）Auntil the hello dead timer expiresBuntil the restart duration timer expiresCuntil the restarting router sets the down bitDuntil the restart helper sends out three CSNPs
单选题Within IS-IS, the restart helper performs which task?（）AIt sends CSNPs to the restarting router.BIt periodically sends TLV 211 to the restarting router.CIt informs other routers in the domain that a router has restarted.DIt tears down adjacency and sends its entire database after 30 seconds.
单选题What is the function of the helper router during a restart event in OSPF?（）ASends Rapid Hellos to the restarting router.BMaintains Adjancency with restarting router.CSends periodic DD packets to the restarting router.DFloods Type 9 LSAs to all routers indicating a restarting event.
单选题In IS-IS， how does the restarting router inform its helpers that a restarts event occurred？（）ASending out a graceful restart PDUBSending an LSP that contains no TLVs.CSending out a restarts TLV with the RR bit set.DReflooding its LSP with a maximum sequence number.
单选题How does route poisoning work with holddown timers to prevent routing loops?（）AInformation learned from one source is not distributed back to that source.BRouting updates from the poisoned source are ignored until a holddown timer expires.CFailed routes are advertised with infinite metrics.DNew routing updates are ignored until the network has converged.EA route is marked as unavailable when its time-to-live is exceeded.
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?（）AIt immediately sends its entire routing table to its neighbors.BEIGRP sends a Hello packet to the DR to inform it of the route failure.CIt automatically forwards traffic to a fallback default route until a successor route is found.DIt sends queries out to neighbors until a new successor route is found.EIt places the route in holddown until LSA updates inform it of a new route to the network.
多选题In which two ways does the BGP graceful capability preserve prefix information during a restart？（）AThe peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.BThe router establishes BGP sessions with other routers and relearns the BGP routes from others that are also capable of graceful restart. The restarting router waits to receive updates from the neighboringrouters. When the neighboring routers send end-of-RIB messages to indicate that they are donesending updates，the restarting router starts sending its own updates.CThe peer router sends an end-of-RIB message to the restarting router.DThe restarting router removes any stale prefixes after the timer for stale entries expires.EThe restarting router does not remove any stale prefixes after the timer for stale entries expires.
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