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单选题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

题目
单选题
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.

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相似问题和答案

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：

Which two conditions, when met, allow an IS－IS Level 2 router to be considered attached?()

A. You can reach other Level 2 routers.

B. It can reach at least one other defined area.

C. The router is reachable by at least two ES-IS nodes.

D. It has at least one enabled reachable prefix with a valid metric defined.


参考答案：B, D

第3题：

A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?()

A. It performs a label pop operation and an IP lookup.

B. It performs a label swap operation and an IP lookup.

C. It sends an error message toward the egress router.

D. It sends an error message toward the ingress router.


参考答案：A

第4题：

A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）

  • A、It performs a label pop operation and an IP lookup.
  • B、It performs a label swap operation and an IP lookup.
  • C、It sends an error message toward the egress router.
  • D、It sends an error message toward the ingress router.

正确答案:A

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：

Which CLI command shows if the router has formed any IS－IS adjacencies?()

A. show clns neighbor

B. show isis neighbor

C. show clns adjacency

D. show isis adjacency


参考答案：A

第7题：

Which three TLV types are valid in an IS－IS Hello PDU?()

A. TLV 10 Authentication

B. TLV 1 Area Addresses

C. TLV 211 Graceful Restart

D. TLV 137 Dynamic Hostname Resolution

E. TLV 14 ABRs


参考答案：A, B, C

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 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

第10题：

Which three TLV types are valid in an IS-IS Hello PDU?（）

  • A、TLV 10 Authentication
  • B、TLV 1 Area Addresses
  • C、TLV 211 Graceful Restart
  • D、TLV 137 Dynamic Hostname Resolution
  • E、TLV 14 ABRs

正确答案:A,B,C

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