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Use in the case of the FW is place between machine in the same subnet ( where Zone is not need ?)

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! Mixed-mode : l2 and L3 interface, but no IRB interface!!!

! set protocols l2-learning global-mode transparent

interface @ layerhttps://community.juniper.net/communities/community-home/digestviewer/viewthread?MID=72245#bm6cc37a88-cd7c-4755-9c1b-03abc1f2dcbf
transparent-mode put physical interfaces into zones, but you would configure them with family bridge rather than with family ethernet-switching.
ethernet-switching mode, then you put irb interfaces into security-zones rather than physical interfaces



https://www.juniper.net/documentation/en_US/idp5.0/topics/concept/intrusion-detection-prevention-standalone-transparent-mode-overview.pdf

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https://www.juniper.net/documentation/en_US/junos/topics/example/security-mixed-mode-configuring.html

Mixed mode supports both transparent mode (Layer 2) and route mode (Layer 3); it's the default value.