Secure Shell (SSH) - allows for secure interactive control of remote systems. All communication is encrypted and is typically used to remotely login to a network device(22), Telnet - used to remotely connect to another system. Be aware that all data is transmitted in cleartext. (23), File Transfer Protocol (FTP) - a generic method of transferring files. It can include usernames and passwords to provide file security. (20,21), Simple Mail Transfer Protocol (SMTP) - used when sending email. (25), Domain Name System (DNS) - provides address to name resolution. For example, it identifies the IP address for the name www.testout.com. (53), Hypertext Transfer Protocol (HTTP) - used by web browsers and web servers to exchange hypermedia (such as web pages) through the World Wide Web and intranets. (80), Post Office Protocol 3 (POP3) - email messages are downloaded to the client. (110), Internet Message Access Protocol (IMAP) - an email retrieval protocol designed to enable users to access their email from various locations without transferring messages or files between computers. (143), Remote Desktop Protocol (RDP) - a proprietary Microsoft protocol that allows a user to view and use the graphical desktop of a remote computer system as if they were sitting in front of it. (3389), Lightweight Directory Access Protocol (LDAP) - the protocol used to access this information across the network.is an open-source, vendor neutral protocol. It can work with other directory services, not just Microsoft’s Active Directory. (389), Hypertext Transfer Protocol over Secure Socket Layer (HTTPS) - a secure form of HTTP that uses TLS to encrypt all communication. (443), Server Message Block (SMB)/Common Internet File System (CIFS) - enables the sharing of folders and printers on the network. Remote users can access files in a shared folder on a server or workstation. Likewise, a remote user can send print jobs to a shared printer. (445),

Ports and Protocols

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