Which of the following choices describe a condition when RAM and Secondary storage are used together?

A.
Primary storage

B.
Secondary storage

C.
Virtual storage

D.
Real storage

Explanation:
Virtual storage a service provided by the operating system where it uses a combination of RAM and disk
storage to simulate a much larger address space than is actually present.
Infrequently used portions of memory are paged out by being written to secondary storage and paged back in
when required by a running program. Most OS’s have the ability to simulate having more main memory than is
physically available in the system. This is done by storing part of the data on secondary storage, such as a disk.
This can be considered a virtual page. If the data requested by the system is not currently in main memory, a
page fault is taken. This condition triggers the OS handler. If the virtual address is a valid one, the OS will locate
the physical page, put the right information in that page, update the translation table, and then try the request
again. Some other page might be swapped out to make room. Each process may have its own separate virtual
address space along with its own mappings and protections.
Incorrect Answers:
A: Primary storage refers to the combination of RAM, cache and the processor registers. The data waits for
processing by the processors, it sits in a staging area called primary storage. Whether implemented as
memory, cache, or registers (part of the CPU), and regardless of its location, primary storage stores data that
has a high probability of being requested by the CPU, so it is usually faster than long-term, secondary storage.
The location where data is stored is denoted by its physical memory address. This memory register identifier
remains constant and is independent of the value stored there. Some examples of primary storage devices
include random-access memory (RAM), synchronous dynamic random-access memory (SDRAM), and readonly memory (ROM). RAM is volatile, that is, when the system shuts down, it flushes the data in RAM although
recent research has shown that data may still be retrievable.
B: Secondary storage holds data not currently being used by the CPU and is used when data must be stored
for an extended period of time using high- capacity, nonvolatile storage. Secondary storage includes disk,
floppies, CD’s, tape, etc. While secondary storage includes basically anything different from primary storage,
virtual memory’s use of secondary storage is usually confined to high-speed disk storage.
D: Real storage is another word for primary storage and distinguishes physical memory from virtual memory.
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition
((ISC)2 Press) (Kindle Locations 17164-17171). Auerbach Publications. Kindle Edition.
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press)
(Kindle Locations 17196-17201). Auerbach Publications. Kindle Edition.
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press)
(Kindle Locations 17186-17187). Auerbach Publications. Kindle Edition.