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Free H12-261_V3.0 Exam Braindumps (page: 35)

Page 12 of 120
PDF with 479 Questions

OSPIn Fv3, the Router-LSA is generated for each router, which describes the interface address and cost of each link of the router, and also includes the RouterID of the neighboring router.

  1. True
  2. false

Answer(s): B

Explanation:

only interface ID, there is no interface address.





The following G about ISISIs R's description correct?

  1. ISIS GThe R feature is enabled by default.
  2. ISIS GR has a total of four timers.
  3. ISIS GR notifies events and maintains neighbor relationships through CSNP messages.
  4. ISIS GR defines a whole new TLV structure to support this feature.

Answer(s): D

Explanation:



IS-ISGR (Graceful Restart) is a high-reliability technology that supports the GR capability, enabling uninterrupted data forwarding. Other devices in the area will perform routing calculations based on the new link state database, resulting in routing interruptions or routing loops. IS-IS GThe R process is completed by the cooperation of GR-Restarter and GR-Helper. GR-Restarter: A

device that is capable of GR and needs to perform GR.
GR-Helper: A device that has the GR capability and assists the GR device to complete the GR function. GR-Restarter must have the ability of GR-Helper. To implement GR, IS-IS introduces TLV No.
211 (Restart TLV) andT1, T2, T3 three timers.
GR After the Restarter receives the CSNP from the Helper, it starts to synchronize the LSDB. IS-In the extension of the GR capability of IS, three timers are introduced, namely T1, T2 and T3.



The CSNP packets of ISIS and the DD packets of OSPF are both used in the MA network to describe the summary of the link state database.Which statements are correct

  1. Both types of packets need to be confirmed by the peer router after they are sent, otherwise they will need to be retransmitted.
  2. Once the adjacency is established successfully, CSNP packets and DD packets will stop sending
  3. Both types of packets do not need to be confirmed by the peer router after they are sent.
  4. OSPThe master-slave relationship in the DD packet interaction of F has no identity binding with DR/BDR; while CSNP packets are only generated by DIS

Answer(s): D

Explanation:

DD messages require implicit acknowledgement.



Regarding route introduction, which of the following descriptions is wrong?

  1. Support impo when BGP generates routes. There are two methods, rt and Network, and the Network method is more accurate.
  2. By default, the default metric value of external routes imported by OSPF is 1, and the type of imported external routes is Type2.
  3. ISIS level-2 netAfter the work route is imported to level-1, if the import policy is not manually configured, a routing loop will be formed.
  4. Importing IBGP routes into OSPF may cause routing loops.

Answer(s): C

Explanation:

ISIS routes leak and do not form loops. Manual policies are required to control which routes are leaked. Suboptimal paths may occur.






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