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Symmetric active mode

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

Symmetric active mode is an NTP peering mode in which each peer acts as a time source for the other.

Symmetric active mode is an NTP peering relationship in which two devices act as time sources for one another, rather than using a client–server hierarchy. section 2.3.2

Configure the peering relationship on both devices:

  • Use `ntp peer ip-address`, specifying the other device’s IP address. section 2.3.2
  • Unlike `ntp server`, the relationship makes each peer a time source for the other. section 2.3.2
  • Symmetric active mode is outside the listed CCNA exam topics. section 2.3.2

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines the mode and gives its Cisco IOS command, but does not provide verification output or troubleshooting procedure.
Examples
Uses `ntp peer ip-address` on each device, with each command naming the other peer.
What you can do after
Apply it via Cisco IOS by configuring matching NTP peer relationships on two devices.
How it connects
Contrasts NTP client/server mode and server mode while relating peers to time sources.
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