Which protocol provides secure remote CLI access to a Junos device?

Secure Shell (SSH) provides encrypted transport, strong authentication, and protection against replay attacks, making it the supported protocol for secure, remote CLI sessions to Junos devices. Junos disables Telnet by default and recommends SSH for all administrative access.

A. FTP transfers files and is not used for interactive CLI access.

B. SNMP is for management polling/traps, not an interactive CLI.

C. Telnet offers CLI access but transmits data in clear text and is therefore insecure.

1. Junos OS System Basics Configuration Guide, “Using Secure Shell (SSH) to Access the Routing Engine,” Section Configuring SSH, https://www.juniper.net/documentation (accessed 14 May 2026).

2. Juniper Networks Day One: “Securing the Routing Engine,” Chapter 2, p. 17.