cisco security plus certification

cisco security plus certification.Figure 8-3 Page Representation ExampleThe virtual address space of each process can be smaller or larger than the total amount of physical memory available to the computer. A working set is a subset of the virtual address space of an active process. If a thread of a process attempts to use too much physical memory (more physical memory than is available), the system writes some memory contention pages to disk. The total amount of virtual address space available for use by a process within a given system is limited by the amount of physical memory and the space available on the hard disk used to hold the paging file.Some other concepts related to memory allocation on Windows systems will now be introduced. Although they all end up allocating memory, the allocation methods are slightly different. VirtualAlloc is a dedicated allocation method for the OS virtual memory system, in the form of reserved memory blocks that are allocated directly in virtual memory. HeapAlloc allocates whatever size of memory is requested, meaning it allocates it by default regardless of the size of the memory to be allocated. Malloc is another memory allocation method, but it is more programming oriented and does not rely on the Windows0SECFND exam does not require candidates to understand the operational details of each memory allocation method, only a general understanding of memory allocation.Taste The important memory allocation concepts are shown below. Volatile memory is memory that loses data when a computer or hardware storage device loses power.Non-volatile memory (NVRAM) does not lose the data it holds whether it is powered up or not. Static memory allocation refers to the allocation of memory by a program at compile time. Dynamic memory allocation is when a program allocates memory at runtime.344 Chapter 8 Windows-Based Analysis Heap refers to memory set aside for dynamic allocation. The stack is memory set aside for thread execution. Virtual address space is the virtual memory used by a process. A virtual address is a reference to the physical location of an object in memory, and the page table converts the virtual memory to the corresponding physicalAddresses. The virtual address space for each process can be smaller or larger than the total amount of physical memory available to the computer.8.4 The Windows registryAfter describing the components of an application and how it uses memory, this section describes the Windows registry (registration). o Any action performed in Windows essentially points to or is recorded in the registry. Therefore, any action performed by the user will refer to the Windows registry. The Windows registry is a hierarchical database that stores the information needed to configure the system for one or more users, applications, and hardware devices.The functions of the Windows registry include loading device drivers, running startup programs, setting environment variables, and storing user settings and operating system parameters.