SAP-C02 Q560 · Networking

Question

How should EC2 instances in AWS synchronize their clocks with an on-premises atomic clock NTP server, with the least administrative overhead?

Accepted Answer

**Option A: Configure a DHCP options set with the on-premises NTP server** is correct because:

1. **Requirement: Sync with on-prem atomic clock NTP server** — The question specifically asks EC2 instances to use an on-premises NTP server (not Amazon Time Sync or any other source).

2. **Requirement: Least administrative overhead** — VPC DHCP options sets allow you to specify custom NTP servers at the VPC level. When you associate a DHCP options set with a VPC, **all EC2 instances in that VPC automatically receive the NTP server configuration via DHCP**. No per-instance configuration is needed.

3. **How it works step-by-step:**
   - Create a DHCP options set specifying the `ntp-servers` parameter with the IP address of the on-premises atomic clock NTP server.
   - Associate this DHCP optio

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