A company has implemented PPTP as a VPN solution. Which of the following ports would need to be opened on the firewall in order for this VPN to function properly? (Select TWO).

The correct answer is C. TCP 1723 D. UDP 47. PPTP (Point-to-Point Tunneling Protocol) requires two components to function: TCP port 1723 for the PPTP control channel, which establishes and manages the VPN session, and GRE (Generic Routing Encapsulation) - IP protocol 47 - for the actual data tunnel that carries…

Security architecture

Question

Options

AUDP 1723
BTCP 500
CTCP 1723
DUDP 47
ETCP 47

How the community answered

(25 responses)

A
8% (2)
C
88% (22)
E
4% (1)

Explanation

PPTP (Point-to-Point Tunneling Protocol) requires two components to function: TCP port 1723 for the PPTP control channel, which establishes and manages the VPN session, and GRE (Generic Routing Encapsulation) - IP protocol 47 - for the actual data tunnel that carries encapsulated packets. On this exam, GRE protocol 47 is listed as 'UDP 47.' TCP 500 is used by IKE/IPSec, not PPTP. The control port is TCP (not UDP) 1723, making option A incorrect.

Topics

#PPTP VPN#firewall ports#GRE protocol#VPN protocols

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