CHN ONE MARK QUESTIONS AND ANSWERS
DIPLOMA IN ELECTRICAL AND ELECTRONICS ENGINEERING
SUBJECT CODE : 24682
SEMESTER : VI SEMESTER
SUBJECT TITLE : COMPUTER HARDWARE AND NETWORKS
STAFF-IN-CHARGE: N.SURESH KUMAR
ONE MARK QUESTIONS AND ANSWERS
UNIT-1
MOTHERBOARD COMPONENTS AND MEMORY
STORAGE DEVICES
1. What is Computer?
A computer is defined as an electronic data processing machine. It receives and stores large amount of information and process them at a high speed according to the given instructions.
2. What are the classifications of computer?
The computer are classified as below,
*PC or personal computer.
*PC-XT or personal computer with extended technology.
*PC-AT or personal computer with advanced technology.
*PC- Pentium.
3. What Is Daughter boards (Interface Cards)?
Interface cards are electronic circuits that enable a PC to connect to or interface with another device. These are inserted into one of the I/O expansion slots available in the motherboard.
4. What are the types of daughter boards?
*IDE card.
*SCSI card.
*Network interface cards.
5. What is expansion slots?
The I/O devices like FDD,HDD, printers and mouse are connected to the CPU through their respective interface cards. These interface cards are connected in the I/O expansion slots available in the motherboard.
6. What are the front panel controls & rear side connectors?
*Front Panel Controls:
This unit include LED‟s and Switches.
*Rear Side Connectors:
The serial port connectors , parallel port connector , VGA video port, keyboard connect, Audio Video connectors and BNC/RJ-45 connectors.
7.What is RAM?
RAM stands for Random Access Memory. It is used for storing programs temporarily. RAM is located on SIMMs ( Single Inline Memory Module) and DIMMs( Dual Inline Module).
8. What is memory?
The cache is a fast memory which lies between the CPU and RAM. It speeds up the overall performance of the system CPU can access frequently needed data from the cache more than from RAM.
9. What are the motherboard components?
Components of mother boards are
*CPU
*BIOS
*RAM
*Cache RAM
* Bus expansion slots
* On-board I/O connectors
*On-board IDE connectors
10. What is CPU?
The CPU(Central processing unit) is the brain of the computer in which the majority of the computing tasks are carried out. The CPU may have a heat sink installed on it for dissipate the heat generated by the CPU.
11. What are the different types of memory modules?
*SIMM-Single Inline Memory Module.
*DIMM- Dual Inline Memory Module.
*RIMM.
12. What are types of bus?
*PC/PC-XT Bus.
*Local bus.
*PCI Bus.
*AGP bus.
*USB.
13. What is chipsets?
A chipset or PCI set is a group of microcircuits. This controls and co-ordinate the flow of data to and from the CPU, main memory, the devices connected on the ISA and PCI buses, the hard drives, any devices connected to the IDE channels.
14.What is processors?
Processor is the central component of the computer. So it is otherwise called as CPU. It is responsible for all operations of the computer. The quality (speed, accuracy etc) of a computer is determined by the CPU.
15.What is hard disk drive ( HDD)?
Hard disk is a secondary storage memory device. This is used to store large amount of data permanently. This was invented in 1954 by IBM with a storage capacity of 5 MB.
16.What is IDE( Integrated Drive Electronics)?
IDE stands for integrated drive electronics . It was developed in the year 1986 by western digital and Compaq. The main features are
*IDE drives can be connected directly to the system bus.
*IDE drives can be connected to all the type of systems.
*IDE design supports two internal hard disks.
17. What is SCSI (Small computer system interface)?
SCSI refer to small computer system interface. This was introduced in 1986.
18.What is SATA (Serial Data)?
This was introduced in 1999 by serial DATA working group. This is a serial interface for connecting hard disk drives with the system. The main features are
*It requires low signal voltage of 500mv peak to peak.
*It can have flexible connector cable upon one meter. So it is easy to route inside the PC‟s chassis.
*The number of pins in the connectors is reduced below 40.
*It „s data transfer rate is 150MB/s to 600MB/S.
19. What is FAT?
FAT refers to file allocation table. This acts as a table of contents for the disk. This contains
*Name of the file and its location in the disk.
*Free sectors details and its status.
This table helps while reading and writing of data from/ to the disk.
20.What is DVD-ROM?
DVD-ROM refers to digital versatile disk read only memory. This is used to store large amount of data.
UNIT-2
I/O DEVICES AND INTERFACE
1. What are the different types of keyboard?
PC/PC-XT keyboard
PC-AT keyboard
Enhanced PC-AT keyboard
Windows keyboard
Multimedia keyboard
Remote keyboard
2. What is the keyboard signal?
The keyboard is connected to the system board through a flexible Standard DIN connector. There are two types of DIN connector:
i) 5 PIN DIN connector
KBD clock, KBD data, N/C, GND, +5V (VCC)
ii) 6PIN DIN connector
KBD clock, GND, KBD data, N/C, +5V, N/C
3. What is the operation of mouse?
(i)Click
(ii)Double Click
(iii)Drag
4. What is the optical mouse?
The optical mouse eliminates the mouse ball, replacing it with a optical sensors that track movement of the mouse against the background of the mouse pad.
5. What is display?
A display device is an output device for presentation of information for visual, stored or transmitted in various forms. When the input information is supplied as an electrical signal, the display is called electronic display.
6. What is the LCD?
LCD - Liquid Crystal Display.
This was discovered in 19th century by an Austrian, botanist Friendrich Reinitzer. In this, the display is made up of liquid crystal. Liquid crystals are transparent substance having a property of both solid and liquid.
7. What is TFT display?
TFT-Thin Film Transistor display
Active-matrix display is called thin-film transistor (TFT) display. It uses a separate transistor for each color pixel arranged in matrix on a glass substrate. It can display high-quality color that is viewable from all angles.
8. What is MODEM?
MODEM means Modulator and Demodulator. This is the device used to link two PCs which are at long distance using telephone lines.
9. What DIP switches?
These switches are present in the interface card and are used to change the printer settings that can be changed are
1. Printing of graphics and accented characters.
2. Page length
3. Slashed zeros
4. Print quality
5. Line spacing
6. Auto line feed.
7. Character set for different countries.
10. What is ink jet printer?
Inkjet printers are non-impact printers. The characters are formed by spraying ink droplets on the paper by pumping ink through
a nozzle from a ink tank.
11. What is the SMPS?
SMPS-Switched Mode Power Supply.It converts A/C electrical power into suitable D/C voltage. The SMPS voltage levels and functions are DC Output : +5v, +12v,-5v,-12v.
12. What is USB?
USB - Universal Series Bus.
This was developed jointly by Intel, Compaq, IBM, Microsoft, etc. In September 1995.
The features are,
1. Maximum of 127 devices can be connected to a port using a hub or daisy chaining,
2. It carries 5v power supply. So we connect hand held scanners, hand disks etc directly to this port. No need for giving a separate power supply.
3. Its data transfer rate is 12M bits/sec.
13. What is the classification of cables?
Internal cables are
1. Motherboard power cable
2. All 4 pin drive power cable
3. Floppy drive ribbon cable
4. Hard drive cable
External cables are
1. AC power cable for the PC
2. AC power cable for the monitor
3. AC power cable for the printer
4. Keyboard cable
5. Mouse cable
UNIT-3
TROUBLE SHOOTING OF DESKTOP AND LAPTOPS
1. What is BIOS?
BIOS stands for basic input output system. All motherboard has a small block of read only memory(ROM).This contain a set of program that are used to supervise the operation of the computer these program are called bios or ROMBIOS. This acts as an interface between the processer and other motherboard component
2. What is different function of BIOS?
*Start up routines
*Service handling routines
*Hardware interrupts handling routines
3. What are different types of CMOS set up?
*Standard setup
*advanced setup
*chip set setup
*power management setup
*load fail save default
4. What is post?
Post is a series of program routine in the motherboard ROM firm ware and is used to check the system components .they was introduced IBM in 1981.when we switch on the computer, POST is executed first and automatically perform a series of test that checks the various component in the system the components tested by POST are CPU, ROM motherboard supports circuitry, memory and major peripherals.
5. What is IPL hardware?
IPL hardware is a minimum hardware need to begin post successfully.
At once the computer is switch on or reset, the IPL hardware transfers control to post. After the completion of all test, post transfer the control to the bootstrap program. Bootstrap program can be either from hard disc or floppy disk
6. What is post test sequence?
The different types of test can be performed by post. It gives the address if an error is encountered in the sequence of the test the halt address tells us how for the post has progressed and indicates where the problem is lies
7. What are the beep codes and error messages?
Beep code error message
No beep - power supply
Continuous beep - power supply, memory
Repeating short beeps - power supply
1 long beep and 1 short beep - motherboard
1 long beep and 2 short beep - video adapter card
1 short beep and bad/no display - video cable and/ or display
1 short beep and no boot - disk cable, adapter or disk
8. What is diagnostic software?
They used to identify the installed computer parts, analyses disk drives and test the working condition of the device and ports some of the diagnostic software are used to perform the machine level task like low-level formatting sector reading, fat and partition table analyzing
9. What is bench mark program?
A bench mark program is a act of running a computer program, a set of program or other operations, in order to asses a relative performance of an work. Normally by running a number of standard tests and trials against it
10. What is computer virus?
Viruses are malicious computer program. These programs attach themselves as executable code and replicate to diskettes, LANS and WANS, telecommunication links. It damage the data or executable files without the user knowledge
11. What are the precautions of virus?
*Execute CHK DISK and check the size of the base of RAM memory.
*Important files or data should be given read only attributes.
*note down the size of the command .com file .it should not change.
*check hidden files and bad sector.
*Install the good antivirus software in computer system
12. What is antivirus software?
These softwares are called virus scanners, which are used to search the system area as well as program files known virus infections these are created as response to known viruses.
13. What are the popular antivirus software?
*Kesperskey
*Vx2000plus
*quick heal
*Dr. soloman antivirus
*Microsoft antivirus
*Norton antivirus
14. What is signature of virus?
Antivirus scanners are used to protect against known viruses. These
Scanners are used a file called signature file to detect the viruses. A signature file is a database that list all known viruses, Along with their specific attributes these are sample of each virus code , the type of files is infects, any other useful information.
15. What is firewall?
A firewall is a device installed between the internal network of an organization and the test of the internet. It is design to forward some packet and filters.
UNIT-4
COMPUTER NETWORK DEVICES AND OSI LAYERS
1. What is network? Mention its types.
A network is a set of device connected by communication links.
A node can be a computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the network.
Networks are categorized into three types:
1. Local Area Network (LAN)
2. Metropolitan Area Network (MAN)
3. Wide Area Network (WAN)
2. What is LAN?
A LAN is a data communication system within a moderated sized geographical area over a physical communication channel of moderate data rate, allowing a number of independent devices to communicated directly with each other.
LAN is usually links the devices in a single office, building or campus.
3. What is WAN?
A WAN is generally an extension of an internal network into the wide area using private circuits.
4. What is CAN?
A campus area network is a computer network interconnecting a few local area network (LAN) within a university campus or a corporate campus.
This network may link a variety of campus buildings including departments, the university library and student halls of residence.
5. What is Home Area Network (HANs)?
A network contained within a user’s home that connects a person’s digital devices.
This network is a small area network.
It connects computer and entailment appliance.
Found mainly in the home.
6. What is internet?
A collection of network being connected physically via routers or gateway is called internet. Machines on one network communicate with other networks by sharing data with each other.
Internet that uses the TCP/IP protocol suite.
7. What are the ways of internet connection?
There are two ways in establishing the internet connection:
1. Dialing into an ISP through a telephone line.
2. Direct connection to the ISP through leased line.
8. What is Intranets?
An intranet is an internal network that implements internet and web technologies such as Web servers and Web browsers that use HTTP and HTML.
9. What is Extranets?
Extranet are private network that uses internet protocols and public telecommunication system.
These are used to share the operation of the host organization with suppliers, venders, partners, customers or other businesses.
10. Mention the uses of extranets?
1. Extranet can be used to exchange large volumes of data.
2. Reduced time to market.
3. Lower cost.
4. Faster access.
5. More users –friendly.
11. What is Peer-to-Peer (P2PN)?
Most modern operating system allow peer - to –peer network.
This network does not have a central computer or dedicated server; in other words, all computers are independent.
This type of network is the type of network you would most likely find in home networks or small networks.
12. What are advantages of twisted pair?
1. It can be used for transmitting either analog or digital signals.
2. Common application is telephone system.
13. What are the advantages of coaxial cable?
1. Coaxial cable is a good idea for a home network because it is easy to install.
2. Low cost.
3. Easy to wire.
4. No hub is needed.
5. Easy to expand.
14. What is fiber optics?
1. Fiber optic is a glass or plastic cable. It is a perfect media to connect buildings and campuses together.
2. Fiber optics are used to carry digital data signals in the form of modulated pulses of light.
15. What are the advantages of fiber optic cable?
1. High speed and distance.
2. Noise resistance.
3. Good for network “back bones” point to point.
4. Bandwidth of more than two Gbps (Giga bits per second).
5. Transmission loss is low at long distance.
16. What is switch?
• A switch is a small device that joins multiple computers together at low –level network protocol layer.
• Technically, switches operate at layer two (Data link layer) of the OSI model.
17. What is router?
1. It operates at network layer.
2. Opens network packet and routes based on network layer addresses.
3. Used to connect LANs to WAN.
4. Translates LAN to WAN formats.
5. Router connects to a combination of local remote networks.
18. What is gateway?
The gateway provides both the basic system interconnection and the necessary translation between the protocols in both directions.
1. Gateway is a hardware/software package that runs on OSI application layer and allows incompatible protocols to communicate.
2. It is an internetworking device in connecting device.
19. What is simplex?
• Data in a simplex channel is always one way unidirectional communication.
• Simplex channels are not often used because it is not possible to send back error or control signals to the transmit end.
20. What is half duplex?
• A half duplex channel can send and receive, but not at the same time.
• It‟s like a one –lane bridge where two-way traffic must give way in order to cross.
• Only one end transmits at a time, the other end receives.
21. What is full-duplex?
Data can travel in both directions simultaneously. There is no need to switch from transmit to receive mode like in half-duplex. It‟s like a two bridge on a two-lane highway.
UNIT-5
802. X AND TCP/IP PROTOCOLS
1) What is the type of protocol?
*transmission control protocol (TCP).
*internet protocol (IP).
2) What is OSI?
Open system interconnection is a set of protocols that allows any two different system to communicate regardless of their underlying architectures .the purpose of OSI is to show how to facilitate communication between different system without requiring changes to the logic of the underlying hardware and software.
3) What is TCP/IP?
TCP/IP is usually called transport layer it designed to allow peer entities on the source and destination hosts to carry on a conversation, just as in the OSI transport layer.
4) What are sockets?
Sockets are defined in the operating system as a structure .two processes need a socket at each to communicate with each other.
5) What is TCP?
TCP (Transmission Control Protocol). TCP is a connection oriented protocol, a connection can be made from client to server and from then on any data can be send along the connection.
6) What is UDP?
UDP (User Datagram Protocol). The symbol unreliable transport layer protocol in the internet is called user datagram protocol. It does not add anything to the services of IP except for providing process to process communication instead of host to host communication.
7) What is IP?
* It consists of IP header that includes source address, destination address and other information use by the receiving host.
* Purpose of IP is to address and route packets accordingly through the network.
8) What is IGMP?
Internet Group Management Protocol (IGMP) helps multicast routers create and update a list of royal members related to routed interface. IGMP not a multicasting routing protocol.
9) What is ICMP?
Internet Control Message Protocol ICMP message type is encapsulated in a IP packet. ICMP sends five type of errors report in messages and four pairs of query messages to support the unreliable and connectionless internet protocol.
10) What is ARP?
The address resolution protocol is dynamic mapping method that finds physical addresses given an IP addresses.
12) What is RARP?
Reverse address resolution protocol. It maps the Mac addresses to an IP addresses but is replace by Dynamic Host Configuration Protocol (DHCP).
13) What is IP addressing?
*Each network card on a TCP/IP network has one or more IP address assigned to it. An IP addresses is the 32 bit value that is said by the system administrator at a work station or at the server. The format of IP addresses is a, b, c, d where a, b, c, d are decimal values between 0 and 255. Example : 198.168.1.1
14) What is sub netting?
Sub netting allows an additional level of hierarchy in IP addressing. A subnet is a network connected to another network via a router. Routers are used to connect complicated networks with many segments.
15) What is super netting?
Super netting allows the addresses assigned to a single organization to span multiple class prefixes, instead of using single IP network prefix for multiple physical network.
16) What is dotted to decimal notation?
To make the IP addresses more compact and easier to read ,internet address are usually return in decimal form with decimal point(dot)separating the bytes.
17) What is ipv6?
It is the latest version of the internet protocol has a 128 bit address space, revised header format, new options, allocation for extension, support for resource allocation, and increased security measures. It provides host to host communication between systems in the internet.
18) What is FTP?
File transfer protocol. It is the standard mechanism provided by the internet for copying a file from one host to another. Transferring files from one computer to another is one of the most common tasks expected from a networking or internetworking environment.
19) What is Ethernet?
* The IEEE 802.3 standard defines Ethernet at the physical and data link layers of the OSI network model.
*The types of Ethernet is 10base5, 10base2, 10baset, 10basef, 100baset.
20) What is fast Ethernet?
Fast Ethernet refers to a set of specifications developed by the IEEE 802.3 committee to provide a low cost, Ethernet-compatible LAN operating at 100mbps.
21) What is TEL NET?
Terminal networking provides a remote login capability, which enables a user at a terminal or personal computer to log on to a remote computer and function as if directly connected to that computer. The protocol was designed to work with simple scroll-mode terminals.
22) What is simple mail transfer protocol (SMTP)?
It is the standard mechanism for electronic for electronic mail in the internet. A feature of SMTP includes mailing lists, return receipts, and forwarding.
23) What is HTTP?
Hypertext transfer protocol is used mainly to access data on the World Wide Web. The protocol transfers data in the form of plain text, hyper text, audio, video and so on.
24) What is POP (post office protocol)?
Pop is a simple, but it is limited in functionality. The client pop3 software is installed on the recipient computer ,the servers pop software is installed on the mail server.
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