In computing, a bus is a communication system that transfers data between components inside a computer, or between computers. This expression covers all related hardware components (wire, optical fiber, etc.) and software, including communication protocols.

The hierarchical structure of buses in a computer system can be broken down as follows:

1. System Bus: This is the bus that connects the CPU to the main memory on the motherboard. The system bus is also called the front-side bus, memory bus, local bus, or host bus.

2. Back-side Bus: This bus connects the CPU with the level 2 (L2) cache, also known as secondary or external cache. The back-side bus operates at a faster speed than the front-side bus.

3. Internal Bus: Also known as the Internal Data Bus, it connects all the internal components of a computer to the motherboard.

4. External Bus: It connects all the external devices like the mouse, keyboard, and printer to the computer.

5. Expansion Bus: This bus allows for new devices to be added to a computer. Examples of an expansion bus include the Peripheral Component Interconnect (PCI), and Industry Standard Architecture (ISA).

6. Address Bus: This is used by the systems to specify the location of data.

7. Data Bus: This is used by the system to transfer actual data.

8. Control Bus: This is used by the CPU to direct and monitor the actions of the other functional areas of the machine.

Each bus has a certain size (measured in bits), and operates at a certain speed (measured in MHz), both of which help to determine its overall bandwidth, or how much data it can transfer at one time.

Question

In computing, a bus is a communication system that transfers data between components inside a computer, or between computers. This expression covers all related hardware components (wire, optical fiber, etc.) and software, including communication protocols.

The hierarchical structure of buses in a computer system can be broken down as follows:

1. System Bus: This is the bus that connects the CPU to the main memory on the motherboard. The system bus is also called the front-side bus, memory bus, local bus, or host bus.

2. Back-side Bus: This bus connects the CPU with the level 2 (L2) cache, also known as secondary or external cache. The back-side bus operates at a faster speed than the front-side bus.

3. Internal Bus: Also known as the Internal Data Bus, it connects all the internal components of a computer to the motherboard.

4. External Bus: It connects all the external devices like the mouse, keyboard, and printer to the computer.

5. Expansion Bus: This bus allows for new devices to be added to a computer. Examples of an expansion bus include the Peripheral Component Interconnect (PCI), and Industry Standard Architecture (ISA).

6. Address Bus: This is used by the systems to specify the location of data.

7. Data Bus: This is used by the system to transfer actual data.

8. Control Bus: This is used by the CPU to direct and monitor the actions of the other functional areas of the machine.

Each bus has a certain size (measured in bits), and operates at a certain speed (measured in MHz), both of which help to determine its overall bandwidth, or how much data it can transfer at one time.

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