Which time protocol offers security features and utilizes site-local IPv6 multicast addresses?

Question

Options

• ANTPv3
• BPTP IEEE 1588v1
• CNTPv4
• DPTP IEEE 1588v2

• A
  5% (3)
• B
  2% (1)
• C
  85% (53)
• D
  8% (5)

Explanation

NTPv4 is correct because it introduced significant security enhancements over its predecessor, including support for symmetric key cryptography and the Autokey security protocol, while also adding native IPv6 support - including the use of site-local IPv6 multicast addresses (such as FF05::101) for time synchronization across a local site.

NTPv3 (A) is incorrect because, while widely used, it lacks the built-in security features and IPv6 multicast support that were introduced in NTPv4. PTP IEEE 1588v1 (B) and PTP IEEE 1588v2 (D) are both Precision Time Protocol variants focused on high-accuracy hardware-timestamped synchronization in LAN environments; they do not utilize site-local IPv6 multicast addresses and are not primarily defined by their security features in the way NTPv4 is.

Memory Tip: Think "v4 = more features" - just like IPv6 upgraded IPv4 with security and broader addressing, NTPv4 upgraded NTPv3 with security and IPv6 multicast support. If the question mentions both security and IPv6 multicast, NTPv4 is your answer.

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