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.

题目

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.

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第1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.

参考答案：A

第2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

正确答案:D,E

第3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

参考答案：C

第4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.

正确答案:C,D,E

第5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

正确答案:A,B

第6题：

Refer to the exhibit. Which statement is co rrect regarding the router configuration shown? ()

A. The router will rebroadcast any DHCP requests received by this interface out to all interfaces included in the ip helper - address commands.

B. The router will rebroadcast any UDP broadcasts received by this interface out to all interfaces included in the ip helper - address commands.

C. The router will unicast any DHCP requests received by this interface out to all addresses included in the ip helper - address commands.

D. This configuration will not do anything because the ip helper - address command needs to also be applied to the 192.168.23.1 IP address.

参考答案：C

第7题：

What is the purpose of configuring router R1 with the "IP Helper address" command？（）

A、IP Helper is used to direct BOOTP clients to a BOOTP server
B、IP Helper is used to prevent the router form forwarding IP broadcasts
C、IP Helper is used to allow IPX clients to communicate with IP-based servers
D、IP Helper is used to accommodate compatibility routers using different IP routing protocols
E、None of the other alternatives apply

正确答案:A

第8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

参考答案：C

第9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

正确答案:C

第10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.

正确答案:B

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.

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