Some nested domains hierarchy appears in the case of directed ordered tree as for the Domain Name System or a directory structure; this similar to hierarchical design of postal addresses.
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The Domain Name System maps its names to (and from) network-specific addresses (usually IP addresses), which in turn may be mapped to link layer network addresses via Address Resolution Protocol.
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For example, compartment boundaries can be defined by a certain type of network technology (e.g., a specific wireless access network) or based on a particular communication protocol and/or addressing space (e.g., an IPv4 or and IPv6 network), but also based on a policy domain (e.g., a national health network that requires a highly secure boundary).
in Internet — Remote procedure call (RPC), a communication process that allows for executing a subroutine or procedure in another address space
Address decoding circuitry used with older processors like the 6502 or Z80 to divide up the processor's address space into RAM, ROM and I/O.
Some operating systems, such as OpenBSD with its W^X feature, and Linux with the Exec Shield or PaX patches, may also limit the length of the code segment, as specified by the CS register, to disallow execution of code in modifiable regions of the address space.
The W^X, Exec Shield, and PaX mechanisms described above emulate per-page non-execute support on machines x86 processors lacking the NX bit by setting the length of the code segment, with a performance loss and a reduction in the available address space.
Compared to the unified system and video memory used by other 8-bit computers of the time, such as the Apple II, ZX Spectrum, and Commodore 64, separate memory has the advantage of freeing up of the Z80 processor's 64 KiB address space for main RAM, and the VDP doesn't need to steal CPU cycles to access video memory.