It depends on the size of the address bus, which is often different than the size of the data bus.
216 = 65,536.
256
216 = 65,536.
A flat address space
Primarily it is being changed because the version 4 address space is now out of addresses for clients and needs a much larger address space for demand (version 6)
An address space is a range of discrete addresses, all of the address locations available in a particular named subset of a computer's memory.
No, it is impossible. The operating system kernel must remain in memory at all times, including the virtual memory manager, thus no single process can physically occupy every address. Indeed, all unused physical memory is allocated to the virtual memory manager. Processes are allocated addresses within the virtual address space but some of those addresses are reserved for system use only. As such, no process can ever use the entire virtual address space let alone the entire physical address space.
The address space of IPV4 is limited to 4294967296 possible unique addresses.
This 48-bit address space contains potentially 248 or 281,474,976,710,656 possible MAC addresses.
An address space is a range of discrete addresses, all of the address locations available in a particular named subset of a computer's memory.
The concept of a logical address space is simply involved the process of mapping the Logical addresses to their Physical Addresses . Logical addresses are generated by the CPU; also referred to as virtual addresses.while Physical Address is the actual address of the data stored on the physical device and mapped by MMU.
To reduce congestion & optimize the IP address space.
Logical address is the address generated by the CPU (from the perspective of a program that is running) whereas physical address (or the real address) is the address seen by the memory unit and it allows the data bus to access a particular memory cell in the main memory. All the logical addresses need to be mapped in to physical addresses before they can be used by the MMU. Physical and logical addresses are same when using compile time and load time address binding but they differ when using execution time address binding.
IP addresses are divided into five IP classes:IP address class AIP address class BIP address class CIP address class DIP address class E