Exam F5CAB1 Topic 2 Question 1 Discussion

Actual exam question for F5's F5CAB1 exam
Question #: 1
Topic #: 2
Which one of the following is a port and protocol combination allowed by the Allow Default setting for Port Lockdown?

Suggested Answer: C Vote an answer

Port Lockdown controls which ports and protocols a Self IP will respond to.
The Allow Default setting permits only a predefined set of BIG-IP internal and required service ports.
The Allow Default list includes:
TCP 443 HTTPS (Management/TMUI access via Self-IP)
TCP 4353 CMI (device sync)
TCP/UDP ports related to HA communication
Other essential internal F5 ports
Why TCP 443 is correct:
It is one of the officially allowed ports under Allow Default.
It enables HTTPS/TMUI access through a Self IP.

by Osmond at Jun 22, 2026, 07:50 AM

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