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.

相似考题

1.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.

2.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.

3.Which CLI command shows if the router has formed any IS－IS adjacencies?()A. show clns neighborB. show isis neighborC. show clns adjacencyD. show isis adjacency

4.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

更多“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”相关问题

  • 第1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：

    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.

    正确答案:B,D

  • 第5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

    正确答案:A

  • 第6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.

    正确答案:B

  • 第7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.

    正确答案:B,D

  • 第8题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第9题：

    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


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    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： D
    解析： 暂无解析

  • 第11题：

    单选题
    Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）
    A

    The ERX router sends an Active Discovery Offer message.

    B

    The ERX router sends an Active Discovery Initiation message.

    C

    The customer device sends an Active Discovery Offer message.

    D

    The customer device sends an Active Discovery Initiation message


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    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： C
    解析： 暂无解析

  • 第13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14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15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

  • 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.

    正确答案:A

  • 第17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.

    正确答案:C

  • 第18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

    正确答案:B

  • 第19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

    正确答案:C

  • 第20题：

    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.


    正确答案： B
    解析： 暂无解析

  • 第21题：

    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.


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    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


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    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.


    正确答案： A
    解析： 暂无解析

  • 第24题：

    多选题
    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.


    正确答案： B,D
    解析： 暂无解析

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