Which two protocols are supported on service-port interfaces? (Choose two.)

Telnet is a network protocol used to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection, commonly used for remote command-line access to network devices, which service ports facilitate.

SCP (Secure Copy Protocol) is a protocol for securely transferring computer files between a local host and a remote host, or between two remote hosts, using SSH. While related to SSH, it's for file transfer, not directly a 'service-port interface' management protocol in the same way as Telnet/SSH.

TACACS+ is an authentication, authorization, and accounting (AAA) protocol that is used *by* the device to authenticate users, not a protocol *run on* the service port interface for direct device interaction.

SSH (Secure Shell) is a cryptographic network protocol for operating network services securely over an unsecured network, providing secure remote login and command-line execution, making it a common choice for managing network devices via service ports.

RADIUS is an authentication, authorization, and accounting (AAA) protocol that is used *by* the device to authenticate users, similar to TACACS+, not a protocol run on the service port interface for direct device interaction.