1.write the difference between RAM and DRAM？SRAM is very tast and fit better with the speed of the cpuis much more expensivetakes more spaceless power consumeis made of four to six transitor to hold the datait is used in cache memoryDRAM：is the most after used RAM in today computerit is slowercheapertake less space about one fourth of SRAM 1/4, one capacitior, and one transiter used to hold one bit of information 。

2.write the different between application s/w and system s/w？System software:The simple answer is that system software is the stuff that makes your computer work. Application software:Application software trains the PC’s brain for higher cognitive functions rather than just keeping the PC alive and connected to the other computers .3.write the difference between ,LAN & WAN?LAN:A LAN is a high-speed data network that covers a relatively small geographic area .It typically connects workstations, personal computer, printers, servers, and other devices.Wan :A WAN connect multiple geopgraphically nearby LANs to one another over great geographic distances. The speed available on a W AN waries depending on the cost of the connections and may be low. WANs opeate using routers , which can “choose ” the most appropriate path for data to take to reach a network node4.write the difference between 3GPL and .4GPL?3GPL:the third programming language high level language.it is assembly language, it will not only a lot of machine instructions into a single instruction, and removed and specific operation but with the work of irrelevant details, such as the use of the stack, a register, thus greatly simplifying instructions in a program Advanced language programming can not directly by the computer recognition, must be converted to be executed4GPL er friendly2.a professional programmen car obtain result with it3.it employs the database management system directly.4.A fourth generation programming language is a programming language designed witha specific purpose in mind such as the development of commercial business software.9.write the difference between windows os and unix os?As far as operating system wiuld seem as if unix has a clear aduntage over windows , unix offers grester flexibility than windows,further more,its more stable abd it dosen't crash as much aswindows。

To some,unix is just as easy to use as windows ,offering a GUI interface as well as command line ,but there are user out there that believe unix is for only forcomputer gurus only,claiming that the fragmentation of the UNIX GUI is its greatest competitive wesknesswrite the different between CRT & LCD?CRT: Calhoole ray lube displays had a standarditool form factor owing to the required shape of heavriy vacuum tubeLCD;Liquid cryslal Displays have a new seirse of style.Free from the bulky shap of CRT,today's flat panel vendors arelelting their imaginations run free with monitors that are colourd and shaped to match a design concept.10.write the difference between DBMS and SMTP?A database management system is a software package with computer programs that control the creation,mountenance and use of a database,it allows organizations to converiently develop databases for various application by database administrators and other specialistSmtp :short for simple mail transfer protocol,a protocol for sending e-mail messages between servers most e-mail systems that send mail over the internet use smtp to send message from one server to another,the message can than be retrieved with an e-mail client using either pop or imap 11.write the difference between switches and routers ?Switches: A network switch is a device that forwards and filters OSI layer 2 datagrams between ports based on the MAC addresses in the packets. Routers: A router is an internetworking device that forwards packets between networks by processing information found in the datagram or packet (Internet protocol information from Layer 3 of the OSI Model).12.what are the Advantage of LCD monitor①LCD monitor consume less power②Do not produce electromagnetic radiation as CTRs do③Are right and slim in size④Do not flickers like CRT’s⑤Full viewable size39.what is data warehouse?data warehouse are computer based information system that are home for "second hand"data that originated from either another application or from an external system source data warehouse are read only integrated databases designed to answer comparative and "what it"questionyers of the OSI Model:1)application: provides services to user apps2)presentation: data representation3)session: communication between hosts4)transport: flow ctrl,error detection/correction5)network: end to end delivery,logical addr6)data link: media access ctrl,physical addr7)physical: medium,interfaces,puts bits on med18.how many bus in the computer ？1paralleld bus ：it carry data across multiple wireas data rates increase , the problem of timing across parallel buses become more and more difficult to go around2serial bus ：serial bus which carry data in bit serial formserial bus can actually be operated at higher over all data rates than a parallel bus19.what is bus ？it is used to transfer the data or power inside the computer or between the computer20.what is computer software ？computer software is the manifestation of a computer program in the form of data store in the memory of a computer 。