Free F5 Networks F5CAB1 Exam Dumps May 2026

The HTTPD allow list controls which IP addresses or subnets may access the Configuration Utility (TMUI) on the BIG-IP system. The Administrator already has two subnets allowed and needs to add a single host IP to the existing list.

The object /sys httpd allow supports actions such as add, delete, and replace-all-with.

Because the goal is to add one more entry without removing the existing permitted subnets, the correct command is:

modify /sys httpd allow add { 172.28.32.22 }

This appends the new host to the existing list while preserving the previously configured networks.

Why the other options are incorrect:

Option A (replace-all-with) would overwrite the entire allow list, removing existing permitted subnets---unacceptable.

Option B (delete) would remove the existing networks and not add the required host.

Therefore, the correct administrative action is to add the jump host's IP.

The Port Lockdown feature controls which services a Self-IP will respond to.

Setting a Self-IP to Allow None means:

The Self-IP will not accept any traffic except the very limited, hard-coded HA ports such as TCP 4353 used for device trust and configuration sync.

All other HA ports, including those needed for network failover and other HA mechanisms, are blocked.

When essential HA services cannot communicate, each device assumes its peer is down.

This results in:

HA failover misbehavior

Both devices thinking the other is offline

Potential active-active condition, which is not intended and can cause traffic disruption

Thus, Allow None can break HA functionality unless the Self-IP is not used for HA links.