Refer to the exhibit. A network engineer just replaced five routers on this OSPF network. When the routing protocol is brought up, R5 cannot reach routes that originate on R1. The engineer verified th

Question

Exhibit

Options

• AConfigure an OSPF virtual link to bridge Area 0 on routers R3 and R4.
• BConfigure automatic neighbor discovery on R1 and R5.
• CConfigure OSPF to have a contiguous Area 0.
• DConfigure each link to be point-to-point.

• A
  82% (41)
• B
  4% (2)
• C
  12% (6)
• D
  2% (1)

Explanation

In OSPF, all non-backbone areas must connect directly to Area 0 (the backbone). If Area 0 is discontiguous (split into two isolated segments), inter-area route exchange fails between the disconnected segments. The symptom here is that R5 can reach routes from R3 and R4 (which are in or adjacent to one segment of Area 0) but cannot reach routes originating on R1 (which is in a disconnected segment). All neighbor relationships are up, confirming the links themselves are functional. A virtual link, configured on R3 and R4 as the transit-area endpoints, creates a logical point-to-point link that bridges the two disconnected Area 0 segments, allowing LSA flooding and route propagation to work correctly between R1 and R5.

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