RDP enables users to remotely connect to their desktop computers from another device. Port 3389: Remote Desktop Protocol (RDP). Port 500: Internet Security Association and Key Management Protocol (ISAKMP), which is part of the process of setting up secure IPsec connections. Network services that use HTTPS for encryption, such as DNS over HTTPS, also connect at this port. HTTPS is the secure and encrypted version of HTTP. Autonomous systems use BGP to broadcast which IP addresses they control. BGP is essential for establishing efficient routes between the large networks that make up the Internet (these large networks are called autonomous systems). NTP allows computer clocks to sync with each other, a process that is essential for encryption. HTTP is the protocol that makes the World Wide Web possible. Port 80: Hypertext Transfer Protocol (HTTP). DNS is an essential process for the modern Internet it matches human-readable domain names to machine-readable IP addresses, enabling users to load websites and applications without memorizing a long list of IP addresses. It can scan all your ports or just those in. Port 25: Simple Mail Transfer Protocol (SMTP). Famatech's Advanced Port Scanner is a free tool that can help you figure how many ports your computer has, and where they are, and their status. SSH is one of many tunneling protocols that create secure network connections. FTP is for transferring files between a client and a server. Ports 20 and 21: File Transfer Protocol (FTP).
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