400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ47

Security Design

Which GRE tunneling extensions provide session tracking and ordered packet delivery in return for additional state stored at the tunnel endpoints?

  • A GRE Key and Sequence number extensions
  • B GRE Protocol Type and Checksum extension fields
  • C GRE Version and Reserved0 extension fields
  • D No extension fields are available in the GRE header to track session data and packet sequences
Explanation

RFC 2890 defines optional GRE Key and Sequence Number extensions. The Key field identifies a tunnel session, and the Sequence Number field supports in-order delivery by requiring tunnel endpoints to maintain sequencing state.

Learn more

Community Discussion

No comments yet. Be the first to start the discussion!