Which of the following ports should be opened on a firewall for secure, remote server administration? (Choose two.)

TCP 22 is the assigned port for SSH (Secure Shell), which provides fully encrypted command-line remote access and is the standard secure administration protocol for Linux, Unix, and network infrastructure. It replaced Telnet specifically because it encrypts all traffic including credentials.

TCP 23 is Telnet, which transmits all data including passwords in plaintext and is explicitly considered insecure - it should never be opened for remote administration.

TCP 389 is LDAP (Lightweight Directory Access Protocol), used for querying and modifying directory services, not for remote server administration sessions.

TCP 3268 is the Microsoft Global Catalog port used for cross-domain Active Directory LDAP queries, not for initiating remote administration sessions.

TCP 3389 is the assigned port for RDP (Remote Desktop Protocol), which provides encrypted graphical remote desktop access and is the primary secure remote administration method for Windows Server environments.