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Free H12-821_V1.0 Exam Braindumps (page: 18)

Page 17 of 56
PDF with 219 Questions

Which of the following statements regarding OSPF route summarization is false?

  1. OSPF supports two route summarization modes: ABR summarization and ASBR summarization.
  2. Any router in OSPF can summarize routes.
  3. Route summarization is the process of summarizing routes with the same prefix into one route and then advertising only the summarized route to other areas.
  4. Route summarization can reduce routing information, decrease the routing table size, and improve router performance.

Answer(s): B

Explanation:

Route summarization in OSPF is restricted to specific routers: Area Border Routers (ABRs) and Autonomous System Boundary Routers (ASBRs). These devices perform summarization to reduce routing table size and minimize advertised routing information between areas or across AS boundaries. Regular routers cannot perform route summarization, making this statement false .



Which of the following statements is false?

  1. If the current DR fails, the current BDR automatically becomes a new DR, and a BDR will be elected again.
  2. A device with a higher router priority has a higher election priority.
  3. When a router with the highest router priority joins an OSPF network, this router will become the new DR.
  4. If two devices have the same router priority, the device with a larger router ID has a higher election priority.

Answer(s): C

Explanation:

The election of a Designated Router (DR) and Backup Designated Router (BDR) occurs during the OSPF network's initial setup or upon the failure of an existing DR. A new router joining an OSPF network does not automatically preempt the current DR, even if it has the highest priority. DR and BDR elections are not preemptive. The other statements are correct regarding OSPF DR/BDR election processes .



Which of the following statements regarding the LSA age field are true?

  1. The unit of this field is seconds. In a LSDB, the LS age of a LSA increases with time.
  2. If the LS age of a LSA has reached the LSRefreshTime (30 minutes), any router can regenerate an instance of this LSA again.
  3. The unit of this field is seconds. In a LSDB, the LS age of a LSA decreases with time.
  4. If the LS age of a LSA has reached the LSRefreshTime (30 minutes), the originator of this LSA needs to regenerate an instance of this LSA again.

Answer(s): A,D

Explanation:

The LS age field in OSPF LSAs (Link State Advertisements) is measured in seconds and increments over time in the Link State Database (LSDB). If the LS age reaches the LSRefreshTime (30 minutes), the router that originated the LSA must regenerate it to keep the LSA valid in the network. Options C and B are incorrect since LS age does not decrease, and only the originator regenerates LSAs .



In the OSPF protocol, inter-area route calculation involves only Router LSA, Network LSA, and Summary LSA.

  1. TRUE
  2. FLASE

Answer(s): B

Explanation:

Inter-area route calculation in OSPF involves Summary LSAs (Type 3) for summarizing routes across areas and ASBR Summary LSAs (Type 4) for locating ASBRs.
While Router LSAs and Network LSAs describe the internal structure of an area, they do not directly participate in inter-area route calculation. Thus, the statement that only Router, Network, and Summary LSAs are involved is false .






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