What is the difference between an LSA 3 and an LSA 4?

Last Updated: Jun 29, 2026
IT Exam Items Repository › Category: CCNP ENARSI v9 › What is the difference between an LSA 3 and an LSA 4?

What is the difference between an LSA 3 and an LSA 4?

  • LSA 3 is a summary of the directly connected Area, and LSA 4 is E1.
  • LSA 3 is a summary of the directly connected Area, and LSA 4 is a summary of the ASBRs.
  • LSA 3 is E1, and LSA 4 is a summary.
  • LSA 3 is a summary of the ASBRs, and LSA 4 is a summary of the directly connected Area.

Explanation: Type 3 LSAs (Inter-Area Prefix) are generated by ABRs to advertise network prefixes from one area into another. Type 4 LSAs (Inter-Area Router) are also generated by ABRs, but their specific purpose is to inform other areas how to reach an ASBR located outside those areas.

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