You are implementing a directly connected routing plan using OSPF on an HPE Aruba Networking CX 6200 and ISP router. What would be the impact of changing the network type to point-to-point?

Question

Options

• AIt will reduce the number of LSA type-2 advertisements
• BA larger number of OSPF routes would be supported
• CIt will increase the number of LSA type-3 advertisements
• DThe configuration would remain as the default

• A
  60% (24)
• B
  23% (9)
• C
  10% (4)
• D
  8% (3)

Explanation

Changing the OSPF network type to point-to-point eliminates the need for a Designated Router (DR) and Backup Designated Router (BDR) election on that segment. Since LSA Type-2 (Network LSAs) are generated only by the DR to describe a multi-access broadcast segment, removing the DR means no Type-2 LSA is produced - reducing (eliminating) Type-2 advertisements, making A correct.

Why the distractors are wrong:

• B is wrong because OSPF network type has no effect on how many routes the protocol can support; route capacity is a platform/memory concern.
• C is wrong because LSA Type-3 (Summary LSAs) are generated by ABRs between OSPF areas - they are unrelated to the network type configured on a single link.
• D is wrong because the default OSPF network type on an Ethernet interface is broadcast, so switching to point-to-point is explicitly a change from the default.

Memory tip: Think "point-to-point = no crowd, no crowd pleaser." On a broadcast segment, the DR is the "crowd pleaser" that sends Type-2 LSAs for the group - remove the crowd (go point-to-point), and the DR (and its Type-2 LSAs) disappears.

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