NETWORK SECURITY
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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42
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80
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666
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1723
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Detailed explanation-1: -Point-to-Point Tunneling Protocol (PPTP) uses TCP port 1723 and IP protocol 47 Generic Routing Encapsulation (GRE).
Detailed explanation-2: -Description. A PPTP tunnel is instantiated by communication to the peer on TCP port 1723. This TCP connection is then used to initiate and manage a GRE tunnel to the same peer.
Detailed explanation-3: -Commonly used to provide remote access to mobile devices, Point-to-Point Tunneling Protocol (PPTP) uses TCP port 1723 for key exchange and IP protocol 47 (GRE) to encrypt data between peers.
Detailed explanation-4: -Press the Windows key + R, then type “cmd.exe” and click OK. Enter “telnet + IP address or hostname + port number” (e.g., telnet www.example.com 1723 or telnet 10.17.xxx.xxx 5000) to run the telnet command in Command Prompt and test the TCP port status. If the port is open, only a cursor will show.
Detailed explanation-5: -Make sure the following ports are open: TCP port 1723 and GRE (IP protocol 47) Double check your configurations as follows: Login to the firewall and click Firewall-> Service. At the bottom click ADD. On the new window, name the service GRE. From the protocol drop down, click on GRE (47) and Click OK.