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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
更多 “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.” 相关考题
考题
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.
考题
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
考题
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.
考题
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
考题
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.
考题
Which three TLV types are valid in an IS－IS Hello PDU?()
A. TLV 10 AuthenticationB. TLV 1 Area AddressesC. TLV 211 Graceful RestartD. TLV 137 Dynamic Hostname ResolutionE. TLV 14 ABRs
考题
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 routerB、The peer router immediately removes the BGP routes that it learned from the restarting router from its BGP routing tableC、The restarting router does not remove any stale prefixes after the timer for stale entries expiresD、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 updatesE、The restarting router removes any stale prefixes after the timer for stale entries expires
考题
Which three statements about OSPF areas are true?（）A、Areas introduce a boundary on the link - state updates.B、Areas are logical definitions specific to any given router.C、All routers within an area have the exact link - state database.D、The calculation of the Dijkstra algorithm on a router is limited to changes within an area.E、The area designated router will always have a priority of 0.
考题
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.
考题
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.
考题
Which three TLV types are valid in an IS-IS Hello PDU?（）A、TLV 10 AuthenticationB、TLV 1 Area AddressesC、TLV 211 Graceful RestartD、TLV 137 Dynamic Hostname ResolutionE、TLV 14 ABRs
考题
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.
考题
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
考题
In IS-IS， how does the restarting router inform its helpers that a restarts event occurred？（）A、Sending out a graceful restart PDUB、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.
考题
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
考题
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.
考题
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 three CSNPs
考题
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.
考题
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
考题
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.
考题
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.
考题
多选题Which two conditions, when met, allow an IS-IS Level 2 router to be considered attached?（）AYou can reach other Level 2 routers.BIt can reach at least one other defined area.CThe router is reachable by at least two ES-IS nodes.DIt has at least one enabled reachable prefix with a valid metric defined.
考题
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.
考题
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
考题
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
考题
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.
考题
多选题In which two ways does the BGP graceful capability preserve prefix information during a restart？（）AThe peer router immediately removes the BGP routers that it learned from the restarting router from itsBGP routing tables.BThe 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.CThe peer router sends an end-of-RIB message to the restarting router.DThe restarting router removes any stale prefixes after the timer for stale entries expires.EThe restarting router does not remove any stale prefixes after the timer for stale entries expires.
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