In Junos OS, NAT rules are evaluated in top-down order . When a new rule is added, it is placed at the bottom of the rule set by default.
To move a rule to the top of the rule set, the command is:
set security nat source rule-set < name > rule < rule-name > top
Option A (top): Correct. Moves the specified rule to the top of the list.
Option B (run): Used to execute operational commands, not rule reordering.
Option C (up): Not valid for reordering NAT rules.
Option D (insert): Not a supported NAT reordering command in Junos.
Correct Command: top
[Reference: Juniper Networks – NAT Rule Evaluation Order and Rule Reordering, Junos OS Security Fundamentals., , ]
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