H12-711 Web TestEngine demo

Select all that apply.

• A

  The main task of port device management is to complete the I/O requests made by users and classify I/
  O devices for users.

• B

  Whenever a process makes an I/O request to the system, as long as it is secure, the device allocator will assign the device to the process according to a certain policy.

• C

  Device management can virtualize a physical device into multiple logical devices through virtualization technology, providing multiple user processes to use.

• D

  In order to alleviate the problem of speed mismatch between CPU and I/O devices and improve the parallelism of CPU and I/O devices, in modern operating systems, almost all I/O devices are exchanging numbers with processors Buffers are used at all times.