It is a method of addressing I/O modules and external devices. The I/O address space is treated separately from main memory address space. Specific I/O machine instructions must be used.
Wednesday, January 29, 2014
What is a I/O processor
An I/O module, with its own processor, and capable of executing its own specialized I/O instructions, or in some cases, general purpose machine instructions.
What is I/O module
It is responsible for the control of one or more external devices (peripherals) and for the exchange of data between those devices and main memory and/or CPU registers.
What is I/O Controller
A relatively simple I/O module that requires detailed control from the CPU or an I/O channel. Synonymous with device controller.
What is I/O Channel
A relatively complex I/O module that relieves the CPU of the details of the I/O operations. A I/O channel will execute a sequence of I/O commands from main memory without the need for CPU involvement.
What is a Interrupt
It is a suspention of a process, such as execution of a computer program, caused by an event external to that process and performed in such a way that the process can be resumed. Synonymous with Interruption
What is Interrupt Driven I/O
It is a form of I/O. The CPU issues an I/O command, continues to execute subsequent instructions, and is interrupted by the I/O module when a latter has completed its work.
What is Interrupt Cycle
That portion of the instruction cycle during which the CPU checks for interrupts. If an enabled interrupt is pending, the CPU saves the current program state and starts processing an interrupt handler routine.
What is a Interpretre
An interpreter is a translator program for a high level programming language that translates and runs the program at the same time. The program that is being interpreted is still in its original source language, the way the programmer wrote it. The interpreter translates one program statement into machine language and then causes the machine language to be executed. It then translates the next statement and so on, until the program is finished.
Interpreted programs run more slowly than their compiler counterparts. However, it is convenient to write a program using an interpreter.
Interpreted programs run more slowly than their compiler counterparts. However, it is convenient to write a program using an interpreter.
What is Intermediate Language
An intermediate language is a language that is halfway between the source language and machine language. The intermediate language can not run by itself and must be run with a special interpreter for each CPU. Intermediate languages are used to make programming languages compatible with a number of computers. Since a large amount of the translation has already been done by the intermediate language compiler, it is faster to create an interpreter for a new CPU family than to create a entire new compiler all over again.
What is Device Interface
Electronic circuit used to interconnect I/O devices to a computer's CPU or memory.
What is Interactive system
One that permits direct communication and dialog between system users and the operating program in the CPU.
What is Integrate Circuit
A tiny piece of solid material, such as silicon, upon which is etched or imprinted a collection of electronic components and their interconnections.
What is a Instruction
An instruction is a command to the computer. The term usually refers to machine language instructions that only the computer understands. However, it may also refer to a command statement in a programming language or software package.
What is Instruction Format
The layout of computer instruction as a sequence of bits. The format divides the instruction into fields, corresponding to the constituent elements of the instruction (namely opcode, operands).
What is Instruction Address Register
A special purpose register used to hold the address of the next instruction to be executed.
What is I/O
Input-Output (I/O) is pertaining to either Input or Output or both. Refers to the movement of data between a computer and a directly attached peripheral.
What is Input Device
A device used to enter information into a computer or other data processing devices, for example, the keyboard, mouse etc.
What is Ink jet Printer
A printing device that uses a nozzle and sprays ink onto paper to form the appropriate characters.
What is Indirect Cycle
That portion of a instruction cycle during which the CPU performs a memory access to convert an indirect address into direct address.
What is Indexed Address
An address that is modified by the content of an index register prior to or during the execution of a computer instruction.
What is Index Register
A register whose contents can be used to modify an operand address during the execution of computer instructions. It can also be used as a counter. An index register may be used to control the execution of a loop, to control the use of an array, as a switch, for table lookup, or as a pointer.
What is Impact Printer
A printer which prints characters by causing impacts to strike against the paper on which information is to be printed.
What is Immediate Address
The contents of an address part that contains the value of operand rather than an address. Synonymous with zero-level address. The contents of an address part that contains the value of operand rather than an address. Synonymous with zero-level address..
What is Hard Disk
A hard disk is a magnetic disk made of metal and covered with a magnetic recording surface.
Tuesday, January 28, 2014
What is general software package
A software package, such as payroll and word processing, developed for a general market comprising many users.
What is general purpose registers
A register, usually explicitly addressable, within a set of registers, that can be used for different purposes, for example, as an accumulator, as an index register, or as a special handler of data.
What is Gate
An electronic circuit that produces an output signal that is a simple Boolean operation on its input signals.
What is Fourth Generation Computers
Computer built between 1975 and till date. They uses large scale integrated circuits, semiconductor memories and powerful high-level languages and operating systems.
What is Flowchart
A pictorial representation that uses pre-defined symbols to describe either the logic of a computer program (program flowchart) or the data flow and processing steps of a system (system flowchart).
What is Floating Point
Floating point is a method for storing and calculating numbers where the decimal points do not line up as in fixed point numbers. The significant digits (no zeroes on the right) are stored as a unit called the mantissa, and the location of the decimal point is stored in a separate unit called the exponent.
What is Flip-Flop
A circuit or device containing active elements, capable of assuming either one of two stable states at a given time. Synonymous with bistable circuit or toggle.
What is Fixed Point Representation System
A radix numeration system in which the radix point is implicitly fixed in the series of digit places by some convention upon which agreement has been reached.
What is FIFO
FIFO (First-in First-Out) is a technique for processing jobs on a first com, first served basis.
What is First Generation Computers
Computer built between 1949 and 1955 which is used vacuum tubes and were programmed in assembly language. An example is ENIAC.
What is Firmware
A category of memory chips that hold their contents when power supply is turned off. ROMs, PROMs, EPROMs and EEPROMs are example of firmware.
What is Fifth Generation Computers
These Computer will be introduced shortly. They will use a large number of processors working concurrently and independently. Simpler programming languages and knowledge based system implementations are expected in this generation of computers.
What is Fetch Cycle
That portion of the instruction cycle during which the CPU fetches from memory the instruction to be executed, next.
What is External interrut
An external interrupt is an interrupt caused by an external source such as the computer operator, external sensor or monitoring device, or another computer.
What is Execute Cycle
That portion of the instruction cycle during which the CPU performs the operation specified by the instruction opcode.
What is Execution Time
The time in which a single instruction is executed and makes up the last half of the instruction cycle.
What is Executatble Program
Executable program is a program that is capable of being run in the computer.
What is Error Detecting Code
A code in which each character or signal conforms to specific rules of construction so that deviations from these rules indicate the presence of an error.
What is Error Correcting Code
It is a code in which each character or signal conforms to specific rules of construction so that deviations from these rules indicate the presence of an error and in which some or all of the detected errors can be corrected automatically.
What is Erasable Optical Disk
A disk that uses optical technology but that can be easily erased and rewritten. A typical capacity is 650 MB.
Who is End user or What is End user
Any individual who uses the information generated by a computer based system.
What is Enable interrupt
It is a condition, usually created by the CPU, during which the CPU will respond to interrupt request signals of a specified class.
What is EBCDIC
EBCDIC stands for Extended Binary Coded Decimal Interchange Code. It is an 8-bit coding system developed by IBM that is used to represent characters in many modern computers.
What is Dynamic RAM (DRAM)
A RAM whose cells are implemented using capacitors. Dynamic RAM will gradually lose its data unless it is periodically refreshed.
What is Diskette?
A flexible magnetic disk enclosed in a protective container. Synonymous with flexible disk.
What is Disabled Interrupt?
it is a condition, usually created by the CPU, during which the CPU will ignore interrupt request signals of a specified class.
What is Direct Memory Access (DMA)?
It is a form of I/O in which a special module, called a DMA module, controls the exchange of data between main memory and an I/O module.
What is Direct Address?
An address that designates the storage location of an item of data to be treated as operand. Synonymous with one-level address.
What is Direct Access?
The capability to obtain data from a storage device or to enter data into a storage device in a sequence independent of their relative position, by means of addresses that indicate the physical location of the data.
What is Digital Computer?
Digital Computer is a computer that accepts and processes data that has been converted into discrete binary numbers. Almost all computers are digital.
What is Digit?
A digit is a single character in a numbering system. In the decimal system, the digits are 0 through 9. In the binary number system the digits are 0 and 1.
What is Destructive memory?
Destructive memory is a memory that loses its contents when it is read, requiring that the circuitry regenerate the bits after the read operation.
What is Demand Paging?
The transfer of a page from auxiliary storage to main memory at the moment of need.
What is Decoder?
It is a device that has a number of input lines of which any number may carry signals and a number of output lines of which not more than one way carry signal, there being a one-to-one correspondence between the outputs and the combination of input signals.
What is Debug?
To debug hardware or software is to correct it. Debugging software means finding the errors in the program logic. Debugging hardware means finding the errors in the circuit design.
What is Data?
Raw Facts and Figures, such as orders and payments, which are proposed into information such as balance due and quality on hand.
What is Daisy Chain?
A method for device interconnection for determining interrupt priority by connecting the interrupt sources serially.
Thursday, January 23, 2014
What is Cycle Time?
Cycle Time is the time interval between the start of one cycle and start of the next cycle.
What is Cycle Stealing?
Cycle stealing is CPU designed technique that periodically "grabs" machine cycles from the main processor usually by some peripheral control unit, such as a DMA (Direct Memory Access) device. In this way, processing and peripheral operations can be performed concurrently or with some degree of overlap.
What is Cross Assembler/Compiler?
A Cross Assembler/Compiler is a translator program that generates machine language for a different computer.
What is Counter?
A device, register or storage location for storing integers that are suitably incremented or decremented to represent the number of occurrences of an event.
What is Control Unit?
That part of the CPU that controls CPU operations, including ALU operations, the movement of data within CPU, and the exchange of data and control signals across external interfaces (Eg. System Bus).
What is Control Storage?
A portion of storage that contains micro-program/micro-code. Synonymous with Control memory.
What is Control Registers?
CPU registers employed to control CPU operations. Most of these registers are not user visible.
What is Control Program?
An operating system program which controls the operations and management of resources of a computer system. The control program's major functions are job scheduling, input/output scheduling, and program monitoring.
What is Conditional Jump?
A jump that takes place only when the instruction that specifies it is executed and specified conditions are satisfied. Contrast with Unconditional Jump.
What is Computer ?
A computer is a general purpose machine that processes data according to a set of instructions that are fed into it.
What is Computer System?
The various components such as input and output devices, storage, and CPU of a computer integrated together to perform the steps called for in the program being executed.
What is Computer Operator or Who is Computer Operator?
A person in the computer center whose duties include setting up the processor and peripheral equipment's, starting the program run, checking on processor operation, and unloading equipment's at the end of a run.
What is Computer Instruction?
An instruction that can be recognized by the processing unit of the computer for which it is designed. Synonymous with machine instruction.
What is Computer Instruction Set?
A complete set of the operators of the instructions of a computer together with a description of the types of meanings that can be attributed to their operands. Synonymous with machine instruction set.
What is Compute?
Compute is to perform mathematical operations, however, a computer's computing is called processing, and it entails more than just arithmetic calculations.
What is Compile Time?
Compile time is the time it takes to translate a program from source language into machine language.
What is Compilation?
A compilation is the process of converting a program written in high level language into machine language.
What is CD?
Compact Disk (CD) is a non erasable disk used for storing digitized audio information, using laser optical method.
What is Combinational Circuit?
A logic device whose output values at any given instant, depends only upon the input values at that time. A combinational circuit is a special case of sequential circuit that does note have a storage capability. Synonymous with machine instruction.
What is Clock Pulse?
A clock pulse is a signal that is used to synchronize the operations of an electronic system. Clock Pulses are continuous, precisely spaced changes in voltage.
What is Clear Memory?
To clear memory is to reset all RAM memory and hardware registers to their blank or non-value position. Rebooting the computer may or may not clear memory but turning the computer off and again ensures that all memory is cleared.
What is Chip?
A chip is a miniaturized electronic circuit. Chips are approximately 1/16th to 1/2 inch square and about 1/30th of an inch. They hold from a few dozen to several million electronic components (transistors, resistors etc). Synonymous with integrated circuit and microelectronic.
What is Character Printer?
A printer that prints one character at a time such as a daisy wheel or dot matrix printer.
What is CD-ROM?
CD-ROM stands for Compact Disk Read Only Memory. It is a non erasable disk used for storing computer data. The standard system uses 12-cm disks and can hold more than 550 MB.
What is Canonical Form?
It is a Boolean function whose terms contain all variables or their complements. This is the unreduced form of the Boolean function in the minterm or maxterm form.
Wednesday, January 22, 2014
What is Bus?
It is a shared communication path consisting of one or more connection lines. In some computer systems, CPU, Memory and I/O devices are connected by a common bus. Since the lines are shared by all components, only one component at a time can successfully transmit.
What is a Buffer?
Storage used to compensate for a difference in rate of flow of data, or time of occurrence of events, when transferring data from one device to another.
What is Bubble Memory?
It is a solid state magnetic memory device. Binary 1s and 0s are represented by the presence or adsense of tiny magnetic domains, called bubbles.
What is Boolean Operators?
A Boolean Operator is one of the Boolean logic operators such as AND, OR, NOT etc.
What is Boolean Expression?
A Boolean expression is a statement using Boolean Operators that expresses a condition which is either true or false.
What is Block?
It is a group of related items like as records, characters etc. handled as a unit during input and output. It is also a section of a program coding treated as a unit.
What is BLOB?
BLOB stands for Binary Large OBject. Essentially, a long bit string used for complex data.
What is BIOS?
BIOS stands for Basic Input Output System. BIOS is responsible for handling the details of input/output operations including the task of relating a program's logical records to peripheral device physical records.
What is Binary Number system?
A number system with a base of two. It consists of two digits, namely 0 and 1.
What is BCD Code?
BCD code stands for Binary Coded Decimal code. It is one of the early coding systems used by computers which is based on the idea of converting each digit of decimal number into its binary equivalent rather than converting the entire decimal value into a pure binary form.
What is Batch Processing?
The running of the several computer programs one after another without the need of a human operator to run each program individually. This is also known as stacked job processing because several jobs are stacked together and processed in groups (batches) for decimal value into a pure binary form.
What is Based/Displacement?
Based/Displacement is a technique that allows a program to be stored and run from any location in the main memory.
What is Base Address?
It is a numeric value that is used as a reference in the calculation of addresses in the executions of a computer program.
What is Base?
In numeric systems, the base is also called the radix. It is the number that determines the value of each digit position. For example, in a base 10 (decimal) system, each position is worth 10 times the value of the position just next to its right.
What is Autoindexing?
It is a form of indexed addressing in which the index register is automatically incremented or decremented with each memory reference.
What is Asynchronous Timing?
It is a technique in which the occurrence of one event on a bus follows and depends on the occurrence of a previous event.
What is Associative Memory?
It is a memory whose storage locations are identified by their contents, or by a part of their contents, rather than by their names or positions.
What is Assembly Language?
It is a computer oriented language whose instructions are usually in one-to-one correspondence with computer instructions and provide facilities such as the use of macro-instructions. Synonymous with computer dependent language.
What is Assembler?
It is a program that translates mnemonic statements into executable instructions. An assembler translates the programs written in the mnemonic assembler language into executable form. A compiler does the same thing for programs written in a high level language.
What is Artificial Intelligence (AI)?
It is a branch of computer science that deals with computers that possess reasoning learning and thinking capabilities that resemble those of human beings.
What is Array Processor?
It is a group of processors connected together and operating synchronously, often under the control of a central processor. Some computers use array processors for high speed floating point math operations or to speed up video operations.
What is Array Element?
An array element is a data value in an array. Each array element can (usually) be treated as a stand alone variable. A specific element can be referenced by combining the array name with an indexing expression.
What is Arithmetic Operators ?
Arithmetic operators are a type of operators. It is used to
perform some arithmetic operation on the variables like as addition, subtraction,
multiplication etc.
What is Arithmetic Operations?
Any of the standard calculations performed in arithmetic addition, subtraction, multiplication or division. The term is also used in reference to negative numbers and absolute values.
What is Arithmetic And Logical Unit?
It is a part of the CPU (Central Processing Unit) that performs arithmetic operations, logic operations and related operations.
What is Arithmetic Floating Point?
Arithmetic which automatically keeps track of the scaling for the results. In floating point operations, the numbers consists of two parts --
a signed mantissa and an integral exponent. Arithmetic is performed on both the mantissa and exponent for the result. It is contrasted with fixed point arithmetic in which the programmer must keep track of the decimal point.
a signed mantissa and an integral exponent. Arithmetic is performed on both the mantissa and exponent for the result. It is contrasted with fixed point arithmetic in which the programmer must keep track of the decimal point.
What is Arithmetic Fixed Point?
Arithmetic in which the computer does not consider the location of radix. For example, all number are considered to be integers.
Monday, January 20, 2014
What is Computer System Architecture?
Architecture is a general term referring to the structure of all or part of a computer system. The term also covers the design of system software such as the operating system as well as referring to the combination of hardware and basic software that links the machines on a computer network.
What is Application Processor ?
Application processor is a processor dedicated to a single application. A hardware circuit designed to speed the matching of text strings is an application processor.
What is ANSI Compatible?
ANSI compatible refers to a standard defined by the American National Standard Institute (ANSI).
What is ANSI?
ANSI stands for American National Standards Institute. ANSI is a membership organisation, found in 1918, that is devoted to the development if American industry standards. ANSI also coordinates and messages American Participation in the International Standards Organisation (ISO) and the International Electrotechnical Commision (IEC). Through ANSI, American business and industry is able to influence international standards that affect trade. ANSI has over 1300 numbers.
What is Analog Computer?
Analog computer is a computer that accepts and processes data made up of continuously varying voltages.
What is Alphanumeric?
A combination of letters, digits and special characters used to form an expression, such as a part number. An example of a alphanumeric expression follows.
PN A-10036-001
Notice that alphabetic, numeric, spaces and punctuation characters may exist in an alphanumeric expression.
PN A-10036-001
Notice that alphabetic, numeric, spaces and punctuation characters may exist in an alphanumeric expression.
What is Algorithm?
A sequence of precise and unambiguous instructions for solving a problem in a finite number of operations.
What is Address Space?
The address space is the total amount of memory that can be used by a program. The address space may refer to, if virtual memory is used, the virtual limit of memory, which includes physical memory and disk storage.
What is Address Register?
A register in a processing unit, that contains the address of the storage location being accessed.
What is Address Mode?
The address mode is how a machine instruction refers to memory and peripheral devices.
What is Address Bus?
The portion of a system bus used to transfer address. Typically, the address identifies a main memory location or an I/O device.
What is Address?
An address is the number of a particular memory or peripheral storage location. Every word of a memory and every sector on a disk have their own unique addresses.
What is Accumlater?
The name of the CPU register in a single address instruction format. The accumulator, or AC, is implicitly stores one of the two operands for the instruction.
What is Access Time?
Memory Access Time is how fast a character can be transferred to or from the processor. Access time for RAM chips vary from 50 to 80 nanoseconds or 10s power -9 seconds.
What is Access Control ?
Access control is a process that limits access to objects, files or directories. The control is typically achieved through passwords, the granting of privileges, or the setting of attributes. The operating system uses access control to determine how users, group of users, or resources can interact with the operating system, files, directories and network resources. The level of access is typically assigned by the network administrator.
Also it is providing security for a database system by controlling access to the system itself.
Also it is providing security for a database system by controlling access to the system itself.
What is Access Bus ?
Access bus is a new standard intended to connect relatively low-speed devices such as keyboards, mice, modems and printers.
What is Access or Direct Access ?
Pertaining to the process of obtaining information from or placing data in storage where the access to the storage location is independent of the location most recently accessed. An example of direct access storage medium is disk storage.
What is Absolute Address ?
An address in computer language identifies a storage location or a device without the use of any intermediate reference.
What is Abort ?
The abnormal end of the program because of a system fault error or operator intervention.
What is 8-bit, 16-bit and 32-bit in computer ?
The 8-bit, 16-bit and 32-bit specifications are the computer's internal word size, which is the amount of data the processor can hold in its registers and work on at the same time. Large scale supercomputers hold 64-bits. All things being equal, a 16-bit computer works twice as fast as an 8-bit computer; however, this specification measures only one aspect of a computer's performance.
What is 4 GL ?
A term applied to languages designed for interacting with the programmer, often used to define languages used with relational databases. The intent was a imply that such languages are a step forward from standard high-level programming languages such as C, Pascal and COBOL. 4 GLs are generally preferable for creating database applications and for use with popular development tools.
What is 3 GL ?
3 GL stands for Third Generation Language. It is a language such as C, COBOL, FORTON or Pascal that provides developers with considerable flexibility at the cost of ease of use. Most 3 GLs can handle such detailed tasks as direct memory manipulation and physical disk access, wich most 2 GLs can not handle. 3GLs, however, are complex and require more development time for applicaions.
What is 8088 ?
A microprocessor released by Intel Corporation in 1978; used in computers such as the IBM PC, PC/XT, Portable PC, PCir and compatible models. It is available in speeds of 4.77 MHz, and 8MHz. A 16-bit microprocessor, the 8088 is capable of manipulating 16-bits of data at a time and can access 1 MB of memory.
What is 8087 ?
A math, floating-point, coprocessor from Intel for use with the 8086/8088 and 80186/80188 microprocessors. Available in speeds of 5MHz, 8MHz and 10MHz, the 8087 can dramatically improve system performance.
What is 8086 ?
An Intel microprocessor introduced in 1978. It is a direct descendent of the 8080, but with 16-bit registers, a 16-bit data bus and 20-bit addressing. Available in speed of 4.77 MHz, 8MHz and 10MHz, it allows control over a full megabyte of memory.
What is 8080 ?
An Intel microprocessor with 8-bit addressing and an 8-bit data bus, introduced in 1974. It was one of the first chips which was suitable to serve as a base for a Personal Computer. The 8080 influenced the design of the Z80, the favorite microprocessor in the era of the CP/M operating system.
What is 6845 ?
A programmable video controller from motorola used in IBM's Monochrome Display Adapter (MDA) and color/ Graphic Adapter (CGA).
What is 6800 ?
An 8-bit microprocessor developed by Motorola. Although it failed to gain wide acceptance, it was the precursor of the popular 68000 family of microprocessors.
What is 6502 ?
An 8-bit microprocessor developed by Rockwell International that can address 64 KB of memory. A 1 MHz version was used in early models of apple II microcomputer and as part of early Atari systems, and is used in commodore 64 microcomputer.
Sunday, January 19, 2014
What is Xmodem ?
An error correction protocol used by the DOS application XMODEM and many other communication programs. Xmodem uses a CRC (Cyclical Redundancy Check), a means of detecting errors in transmission between modems or across wired serial links.
What is X.509v.3 ?
A certificate format used to prove identity and public key ownership that is based on a system of hierarchical trust. LAN
What is X.25 ?
It is a International standard that defines how a connection between a DTE and DCE is maintained for remote terminal access and computer communications in packet-switched networks.
What is X Window ?
Distributed, network transparent, device independent, multi tasking windowing and graphics system originally developed by MIT for communication between X terminals and Unix workstations. Also a graphical windowing system developed by MIT that enables a user to run applications on other computers and view the output.
What is Wrapper ?
A package that log requests for Internet services and provides an access control mechanism for Unix systems.
What is World Wide Web (WWW) ?
Also called the web, www, and w3c an interlinked collection of hypertext documents (web pages) residing on a web servers and other documents, menus and database, available via URLs (Uniform Resource Locaters). Web documents are marked for formatting and linking with HTML (HyperText Markup Language), and a web servers use HTTP (HyperText Transfer Protocol) to deliver the web pages. It is a non-proprietary, platform-independent, open document architecture based on ISO standard. It works equally well on stand alone computers, LANs, WANs, and the global Internet, on all major desktop computing platform (Unix, Mac, PC, OS/2).
What is Workstation ?
An access point in a local area network for services provided by the network. Also a desktop computer where network interface card is added with additional software to access the server. It usually has its own processing capability.
What is Web ?
The most commonly used name for the World Wide Web (WWW). It is an interlinked collection of hypertext documents (web pages) residing on web servers and other documents, menus and database, availabel via URLs. Web documents are marked for formatting and linking with HTML, and web servers use HTTP to deliver web pages.
What is Web Of Trust ?
A trust model used by PGP to validate public keys where trust is cumulative, not hierarchical and depends on trust of "introducer".
What is WDM ?
WDM stands for Wave Division Multiplexing. It is a type of multiplexing developed for use on fiber-optic cables. WDM modulates each of several data streams onto a different part of the light spectrum.
What is WAV Files ?
Named for the three character extension WAV (for sound wave), a file containing a digital sound. Depending on the sampling rate and resolution, the sound recorded in the WAV file seems realistic (provided you have the sound card and speakers to hear it). These files can be quite large, running into the multi-megabyte range for high quality recordings.
What is WAN ?
WAN stands for Wide Area Network. It is a data communication network that serves user across a broad geographical area and often uses transmission devices provided by common carriers.
What is VSAT ?
What is VPN ?
Tuesday, January 14, 2014
VOIP
Variable Length Subnet Mask (VLSM)
Virtual Network Perimeter
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A Network that appear to be a single protected network behind firewalls, which actually encompasses encrypted virtual links over untrusted networks.Video Conferencing
Conducting a conference between two or more participants at different sites by using networking devices and protocols to transmit digital audio and video data. Generally each participant has a video camera and microphone and equipment to transform analog signals into a digital bit stream for traversal across a LAN or WAN.Wednesday, January 1, 2014
Why 32 bit processor are called as x86 ?
This question was by one of our follower. So here is the answer to all The original x86 CPU was the Intel 8086. This was followed by the 80186 and the 80286.
All three were actually 16-bit. They were followed by the Intel 486, the Pentium, the Pentium 2, etc. These days, x86 usually refers to the 32 bit version
of the hardware architecture, although it occasionally is used in reference to the x86 processors, regardless of their "bit size".
The 64 bit version is most often referred to by x86-64 or AMD64, the latter due to AMD beating Intel to market with 64-bit x86 based hardware.
And not all 32-bit processors are x86. There are some non x86 32-bit
processors. The term x86 actually signifies backward compatibility with the original 8086 instruction set.
The 32 bit x86,actually x86-32
became so popular that they were referenced as x86.
The exact names would be x86-16 , x86-32 and x86-64(or x64) for the x86 chips.
Basic tips for Secure Browsing !!
1. Never keep same password for different services you use online like gmail , facebook, bank accounts
etc.,
2. Use multiple accounts so that you dont get spams in your personal/official email address.
3. Install good Antivirus and Two way firewall.
4. Use VPN for hiding identity and secure browsing when using internet out of your home.
5. Update your OS, Antivirus, Firewall and Browsers regularly.
6. Install a good spyware & Adware scanner .
7. Never provide personal information openly in public websites. Share your information carefully.
8. Never click on unwanted or suspiicious links. It may be hacking attempt.
9. Change your passwords regularly to increase the security of your daily actiivities.
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