Exam JN0-231 topic 1 question 11 discussion

A Enable the device to assign the same, statically chosen, IP address from a source pool to a host for multiple sessions that require the same source IP address for each session. This option is a global configuration and is applied to all source pools. After a session is established from a host and NAT is performed, the subsequent session from the same host will always use the same translated address. https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/security-edit-address-persistent.html

Use the persistent-nat feature to ensure that all requests from the same internal transport address are mapped to the same reflexive transport address (the public IP address and port created by the NAT device closest to the STUN server). The source NAT rule action can use a source NAT pool (with or without port translation) or an egress interface.