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F5 Networks F5CAB1 Exam - Topic 3 Question 2 Discussion

Actual exam question for F5 Networks's F5CAB1 exam
Question #: 2
Topic #: 3
[All F5CAB1 Questions]

Which one of the following is a port and protocol combination allowed by the Allow Default setting for Port Lockdown?

Show Suggested Answer Hide Answer
Suggested Answer: C

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


by Paz at Nov 20, 2025, 11:38 PM

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Leigha
1 day ago
I thought UDP 8443 was allowed too?
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Malcolm
6 days ago
TCP 443 for the win! Gotta love those default settings.
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Giovanna
12 days ago
Haha, I bet the exam writers had a field day coming up with these tricky options.
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Nada
17 days ago
TCP 443 is the way to go. I remember that from my networking classes.
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Valentine
22 days ago
I always get these port and protocol questions mixed up. TCP 443 sounds about right.
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Chuck
27 days ago
C) TCP 443 is the correct answer.
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Eura
1 month ago
I believe TCP 443 is often used for HTTPS, so it might be the right answer, but I need to double-check my notes.
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Lizbeth
1 month ago
I'm a bit confused about UDP 8443; I don't recall seeing that in the default settings during my studies.
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Sherell
1 month ago
I remember practicing a question about port lockdowns, and I feel like TCP 443 was mentioned as a secure option.
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Ronna
2 months ago
Okay, I've got a strategy here. TCP 80 is for regular web traffic, UDP 8443 sounds a bit unusual, so I'm going to go with C) TCP 443 since that's the standard port for HTTPS.
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Vi
2 months ago
Ugh, I hate networking questions. There's just so much to remember with all these different ports and protocols. I'm going to have to guess on this one.
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Andra
2 months ago
I'm pretty confident I know the answer to this one. The "Allow Default" setting is all about the standard, commonly used ports and protocols, so I'd say C) TCP 443 is the right choice.
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Irma
2 months ago
Agreed, TCP 443 is standard for secure web traffic.
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Leontine
2 months ago
I think it's TCP 443. It's common for HTTPS.
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Hannah
2 months ago
TCP 443 is definitely a common one.
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Maybelle
3 months ago
I think TCP 80 is a common one for web traffic, but I'm not entirely sure if it's included in the default settings for Port Lockdown.
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Lanie
3 months ago
Okay, let's think this through. The question is asking about the "Allow Default" setting, so I'm guessing one of these options is the default allowed port and protocol. I'll have to weigh the pros and cons of each choice.
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Lennie
3 months ago
Hmm, I think I remember learning about port lockdown in class, but I'm a bit fuzzy on the details. I'll need to review my notes to be sure.
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Eun
3 months ago
I remember TCP 80 being mentioned too.
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