ISC2 ISSAP Exam - Topic 3 Question 111 Discussion

Actual exam question for ISC2's ISSAP exam

Question #: 111
Topic #: 3

Which of the following ports must be opened on the firewall for the VPN connection using Point-to-Point Tunneling Protocol (PPTP)?

BTCP port 443

ATCP port 110

CTCP port 5060

DTCP port 1723

Show Suggested Answer

Suggested Answer: D

by Alton at Jan 26, 2026, 08:36 AM

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Shawna

5 days ago

I remember something about GRE protocol needing to be allowed too, but I can't recall the specifics.

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Kiley

10 days ago

I think PPTP typically uses TCP port 1723, but I’m not entirely sure if there are others involved.

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Gearldine

15 days ago

I've got this! PPTP uses port 1723 for the control channel, and also requires GRE (port 47) to be open. Time to put that networking knowledge to use.

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Paris

21 days ago

Ugh, firewall port questions are the worst. I'm going to have to review my VPN protocol knowledge before I can answer this confidently.

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Jarvis

26 days ago

Okay, let me see... PPTP, that's the older VPN protocol. I believe it uses a combination of ports, but I can't remember the exact ones off the top of my head.

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Cecilia

1 month ago

Hmm, I'm not totally sure about the specific port numbers for PPTP. I'll have to think this through carefully.

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Andra

1 month ago

I think I know the answer to this one. PPTP uses port 1723, right?

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