Which two external authentication servers are supported for administrative access to a Junos device? (Choose two.)
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Junos OS, the network operating system used by Juniper Networks devices, supports several external authentication servers for remote access to a device's configuration and management interfaces. Among them, the two most commonly used are RADIUS and TACACS+.
RADIUS, which stands for Remote Authentication Dial-In User Service, is a widely adopted protocol for remote authentication and accounting. It is often used in conjunction with a user database, such as Active Directory or a dedicated RADIUS server, to provide centralized authentication and access control for a network. RADIUS servers can be configured to use a variety of authentication methods, including passwords, digital certificates, and biometric factors. Once authenticated, users are granted access to the network based on their assigned role and permissions. In the context of Junos OS, RADIUS is typically used to authenticate administrators who need to access the device's command-line interface (CLI) or web-based management interface.
TACACS+, which stands for Terminal Access Controller Access-Control System Plus, is a similar protocol that provides centralized authentication, authorization, and accounting services for network devices. Unlike RADIUS, TACACS+ separates authentication and authorization, allowing for more granular access control. TACACS+ servers typically use a two-factor authentication process, requiring users to provide both a username/password and a shared secret key. This provides an added layer of security and helps prevent unauthorized access to the network. In the context of Junos OS, TACACS+ is also used to authenticate administrators who need to access the device's CLI or web-based management interface.
LDAP, which stands for Lightweight Directory Access Protocol, is a protocol used for accessing and maintaining distributed directory information services over an IP network. LDAP is often used in conjunction with an authentication server, such as Microsoft Active Directory or OpenLDAP, to provide centralized user authentication and access control for a network. In the context of Junos OS, LDAP can be used as an external authentication source for administrators who need to access the device's CLI or web-based management interface.
ACE, which stands for Access Control Server, is a Cisco proprietary protocol used for centralized authentication and authorization of network devices. ACE servers typically use a TACACS+ or RADIUS backend to authenticate users and provide access control policies. In the context of Junos OS, ACE is not a supported external authentication server for administrators.