Go back to EX0-106 - SCNS Tactical Perimeter Defense

Question :-

You are the firewall administrator for your company and you have just learned that the Server administrators are gearing up support an L2TP based VPN solution. You are told to be sure that your firewall rule sets will not hinder the performance of the VPN. Which port, from the following list, will you have to allow through the firewall?
TCP 1701
UDP 1701
TCP 443
UDP 443
TCP 1601

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