单选题In IS-IS， how long will the restart helper keep the restarting router in the up state？（）A The hello dead timer expires.B The restart duration timer expires.C The restarting router sets the down bit.D The restart helper sends out three CSNPs.

第1题：

In which two ways does the BGP graceful restart capability preserve prefix information during a restart？（）

• A、The peer router sends an end-of RIB message to the restarting router
• B、The peer router immediately removes the BGP routes that it learned from the restarting router from its BGP routing table
• C、The restarting router does not remove any stale prefixes after the timer for stale entries expires
• D、The router establishes BGP sessions with other routers and relearns the BGP routes from other routers that are also capable of graceful restart. The restarting router waits to receive updates from the neighboring routers. When the neighboring routers send end-of-RIB messages to indicate that they are done sending updates， the restarting router starts sending its own updates
• E、The restarting router removes any stale prefixes after the timer for stale entries expires

第2题：

What is the purpose of the RSVP hello interval?（）

• A、It is the size of the RSVP hello packet
• B、It is how long it maintains RSVP neighbors
• C、It is the length of time between RSVP hello packets
• D、It is how long the router waits before declaring a router to be down

第3题：

What is the function of the helper router during a restart event in OSPF?（）

• A、Sends Rapid Hellos to the restarting router.
• B、Maintains Adjancency with restarting router.
• C、Sends periodic DD packets to the restarting router.
• D、Floods Type 9 LSAs to all routers indicating a restarting event.

第4题：

In which two ways does the BGP graceful capability preserve prefix information during a restart？（）

• A、The peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.
• B、The 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.
• C、The peer router sends an end-of-RIB message to the restarting router.
• D、The restarting router removes any stale prefixes after the timer for stale entries expires.
• E、The restarting router does not remove any stale prefixes after the timer for stale entries expires.

第5题：

In IS-IS， how does the restarting router inform its helpers that a restarts event occurred？（）

• A、Sending out a graceful restart PDU
• B、Sending an LSP that contains no TLVs.
• C、Sending out a restarts TLV with the RR bit set.
• D、Reflooding its LSP with a maximum sequence number.

第6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

第7题：

Which action does a BGP speaker take when it detects that the reset state bit is set in an openmessage?（）

• A、It tears down the BGP session.
• B、It sends a restart message to the peer.
• C、It marks all routes from that peer as stale.
• D、It sends a BGP refresh message to the peer

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第13题：

What are the two benefits of graceful restart？（）

• A、Graceful restart allows session information recovery without disruption to the network.
• B、A node can perform a graceful restart to help a neighbor recover its state. The label bindings are kepton state information， which helps the failed node recover faster and does notaffect the current for wardtraffic.
• C、Graceful restart allows a node to recover state from its neighbor when there is no RP or before thedevice undergoes SSO.
• D、Graceful restart does not allow session information recovery.
• E、During a graceful restart， the router removes any stale prefixes after a timer for stale entries expires

第14题：

Which three pre-conditions must be met before an OSPF router can perform graceful restart？（）

• A、Router must be ABR
• B、Router must contain one sham link.
• C、The network topology must be stable.
• D、Router must be able to forward packets.
• E、Neighbors must support graceful restart.

第15题：

Which two of the following actions must an OSPF NSF-capable router execute after a supervisor engine switchover?（） (Choose two.)

• A、Re-learn the available OSPF neighbors with neighbor relationship restart
• B、Send the graceful restart message
• C、Re-acquire the link state database content for the network
• D、Re-learn the available OSPF neighbors without neighbor relationship restart

第16题：

Within IS-IS, the restart helper performs which task?（）

• A、It sends CSNPs to the restarting router.
• B、It periodically sends TLV 211 to the restarting router.
• C、It informs other routers in the domain that a router has restarted.
• D、It tears down adjacency and sends its entire database after 30 seconds.

第17题：

In IS-IS， how long will the restart helper keep the restarting router in the up state？（）

• A、The hello dead timer expires.
• B、The restart duration timer expires.
• C、The restarting router sets the down bit.
• D、The restart helper sends out three CSNPs.

第18题：

Which pre-conditions must be met before an OSPF router can perform graceful restart？（）

• A、Router must be ABR
• B、Router must contain one sham link.
• C、The network topology must be stable.
• D、Router must be able to forward packets.
• E、Neighbors must support graceful restart.

第19题：

Which three pre-conditions must be met before an OSPF router can perform graceful restart? （）

• A、Router must be an ABR.
• B、Router must contain one sham link.
• C、The network topology must be stable.
• D、Router must be able to forward packets.
• E、Neighbors must support graceful restart.

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