A SysOps administrator needs to register targets for a Network Load Balancer (NLB) using IP addresses.
Which prerequisite should the SysOps administrator validate to perform this task?
Ensure the NLB listener security policy is set to ELBSecurityPolicy-TLS-1-2-Ext-2018-06, ELBSecurityPolicy-FS-1-2-Res-2019-08, or ELBSecurityPolicy-TLS- 1-0-2015-04.
Ensure the health check setting on the NLB for the Matcher configuration is between 200 and 399.
Ensure the targets are within any of these CIDR blocks: 10.0.0.0/8 (RFC 1918), 100.64.0.0/10 (RFC 6598), 172.16.0.0/12 (RFC 1918), or 192.168.0.0/16 (RFC 1918).
Ensure the NLB is exposed as an endpoint service before registering the targets using IP addresses.
From my perspective, the answer is:
Ensure the targets are within any of these CIDR blocks: 10.0.0.0/8 (RFC 1918), 100.64.0.0/10 (RFC 6598), 172.16.0.0/12 (RFC 1918), or 192.168.0.0/16 (RFC 1918).