R2 received an OSPF update from R1, and it received the same update from R3. Referring to the exhibit, what will R2 do?

Question

Exhibit

Options

• AR2 ignores the update from R1.
• BR2 does nothing with R3's update.
• CR2 ignores the update from R3.
• DR2 acknowledges R3 and discards it.

• A
  14% (6)
• B
  10% (4)
• C
  74% (31)
• D
  2% (1)

Explanation

In the exhibit, R2 receives the same OSPF update from both R1 and R3. OSPF has mechanisms to prevent unnecessary processing of duplicate LSAs (Link-State Advertisements). OSPF LSA Processing: OSPF uses LSAs to exchange link-state information between routers. When a router receives an LSA, it checks if it already has a copy of the LSA in its Link-State Database (LSDB). If R2 has already received and processed the update from R1, it will ignore the update from R3 because it already has the same LSA in its database. OSPF uses the concept of flooding, but it does not reprocess LSAs that it already knows about. R2 will keep the update from R1 (the first one it received) and will ignore the same LSA from R3, as it is already in the LSDB.

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