You have recently installed a second Routing Engine (RE) in your router
Which two statements correctly describe the expected behavior if the primary RE fails?
(Choose two.)
A.
The backup RE will assume the master role once the packet forwarding engine restarts
B.
The backup RE will immediately assume the master role
C.
The new master RE restarts the routing protocol process (rpd) and establishes any required
adjacencies based on the configuration.
D.
The new master RE maintains the existing protocol adjacencies initially established by the
previous master RE
Explanation:
Again wrong, the PFE is restarted by the Routing engine when it becomes master.
B and C are correct
When a failover or a switchover occurs, the backup Routing Engine takes control of the system as the new master Routing Engine.
If graceful Routing Engine switchover is not configured, when the backup Routing Engine becomes master, it resets the switch plane and downloads its own version of the microkernel to the Packet Forwarding Engine components. Traffic is interrupted while the Packet Forwarding Engine is reinitialized. All kernel and forwarding processes are restarted.
http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/routing-engine-redundacny-overview.html#section-re-redundancy-default-behavior
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