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F5 Networks F5CAB1 Exam - Topic 3 Question 2 Discussion
Topic #: 3
Which one of the following is a port and protocol combination allowed by the Allow Default setting for Port Lockdown?
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.
Why the other options are incorrect:
A . TCP 80 (HTTP)
Not allowed under Allow Default
HTTP via Self-IP is blocked unless placed under Allow Custom
B . UDP 8443
Not an F5 default service
Not part of the Allow Default ports
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