Exam JN0-648 topic 1 question 18 discussion

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/radius-server-configuration-ex-series-cli.html#id-configuring-radius-server-fail-fallback-cli-procedure Configure an interface to _move_ an end device to a specified VLAN if a RADIUS server timeout occurs: [edit protocols dot1x authenticator] user@switch# set interface interface-name server-fail vlan-name

Answer is B Permit authentication, allowing traffic to flow from the end device through the interface as if the end device were successfully authenticated by the RADIUS server. Deny authentication, preventing traffic from flowing from the end device through the interface. This is the default. Move the end device to a specified VLAN if the switch receives a RADIUS access-reject message. The configured VLAN name overrides any attributes sent by the server. (The VLAN must already exist on the switch.) Sustain authenticated end devices that already have LAN access and deny unauthenticated end devices. If the RADIUS servers time out during reauthentication, previously authenticated end devices are reauthenticated and new users are denied LAN access.