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 expiresB until the restart duration timer expiresC until the restarting router sets the down bitD until the restart helper sends out th

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单选题

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

until the hello dead timer expires

until the restart duration timer expires

until the restarting router sets the down bit

until the restart helper sends out three CSNPs

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相似问题和答案

第1题：

You are investigating routing problems on a device running the Junos OS. You receive the error shown in the exhibit when you attempt to restart the routing process.Which statement describes the problem?（）

A. You have typed an invalid command.

B. You must be in configuration mode to restart the routing process.

C. You do not have permission to restart the routing process.

D. You must wait until close of business to restart the routing process, based on user-defined policy.

参考答案：C

第2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：

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5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 best describes for how long a gas-free test is good ________．

A.For as long as is indicated on the gas-free certificate

B.For the instant that it is made

C.Until valves in line with the tank or compartment are reopened

D.Until changes in temperature or pressure affect the vapor content in the space

正确答案：B

第8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9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:C

第10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

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 expiresB until the restart duration timer expiresC until the restarting router sets the down bitD until the restart helper sends out th

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