Multiple context mode Cisco and transparent firewall?

Question

Cisco

Please tell me what is the Cisco multiple context mode and the transparent firewall setting?
Which 5500 series ASA supports these settings?
What is the difference between Admin Context mode and System Configuration?

"You can run all your contexts in routed mode or transparent mode; you cannot run some contexts in one
mode and others in another." - it turns out only one Context can be launched in one of the modes and only on one device?

Answer 1

1) Global setting: Routed vs Transparent. Quite global. Transparent loses a lot of features, acquiring exactly one.
2) Then, you can choose whether to work in one context or in several (but regardless of the choice, all contexts will be in the mode selected in step 1).
Contexts can be roughly compared to virtual machines. Several logical ASAs in one piece of hardware, different interfaces are allocated to them, traffic between contexts is not transmitted, each of them has its own config.
If failover is activated, then in single-context mode one of the pieces of iron is always idle (as if inefficient), and in multi-context mode, you can spread contexts across ASAs, and if one of them dies, the contexts will be collected on the rest. But one context cannot work simultaneously on two devices.
Well, in the multi-context mode, VPN termination and a number of little features are lost. Although it will be fixed soon.
Somewhere like that.