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Exam 400-007 topic 1 question 167 discussion

Actual exam question from Cisco's 400-007
Question #: 167
Topic #: 1
[All 400-007 Questions]

Which extensions to GRE tunneling provide session tracking and in-order packet delivery in exchange for additional state stored in 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
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Suggested Answer: A 🗳️

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re_j0hn
10 months, 1 week ago
The current specification of Generic Routing Encapsulation [1] specifies a protocol for encapsulation of an arbitrary protocol over another arbitrary network layer protocol. This document describes enhancements by which two fields, Key and Sequence Number, can be optionally carried in the GRE Header [1]. The Key field is intended to be used for identifying an individual traffic flow within a tunnel. The Sequence Number field is used to maintain sequence of packets within the GRE Tunnel
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J_W
11 months, 1 week ago
Selected Answer: A
The GRE Key and Sequence number extensions are specifically designed to provide session tracking and in-order packet delivery. The Key field helps identify the specific tunnel or session, allowing endpoints to associate packets with the correct session. The Sequence number field ensures that packets are delivered and processed in the correct order at the receiving end.
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bdp123
12 months ago
Selected Answer: A
https://datatracker.ietf.org/doc/html/rfc2890
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