1-Define hub.
Ans- A hub is a hardware device used to connect several computers together Hubs can be either active or passive Hubs usual. it can support 8, 12 or 24 RJ45 ports
2-Define modem.
Ans- MOdulator – DEModulator (or Modem) is a device that connects telephone line to computer
It converts digital signal to analog signal and vice versa.
3-What is a switch? Which is faster between hub and switch?
Ans- Switch is an intelligent hub, which is used to segment networks into different sub network called subnets.
Switch is faster and efficient over hub due to good traffic management capability.
4-Define the following: [Repeater, Router, Gateway, Bridge]
Ans-
Repeater:
A repeater is a device that amplifies or regenerating signals transmitted on the network
It is used in long network lines beyond 70 m
Router:
The device which connects two dissimilar networks and can handle different networks
Gateway:
It is a device that connects dissimilar networks.
Bridge:
A device that connects two similar networks.
5-Write two advantages of using an Optical Fibre Cable (OFC) over an Ethernet cable to connect two service stations, which are 190 m away from each other.
Ans-
Low power
Because signals in optical fibres degrade less, lower power transmitters can be used.
Higher datarate
Due to higher bandwidth, data rate of optical fibre is more than the data rate of ethernet cable (upto 1 Gbps).
6-Differentiate between packet switching and message switching technique in network communication.
Ans-
Message Switching
Data is stored in buffer form. The message is sent to the nearest directly connected switching node.This process continues until data is delivered to the destination computer.
Packet Switching
Data is transferring into packet form. A fixed size of packet that can be transmitted across the network is specified.
All the packets are stored in the main memory instead of disk.
7-What was the role of ARPANET in the computer network?
Ans-ARPANET (Advanced Research Projects Agency Network) goal was to connect computers at different universities and US defense. ARPANET started with a handful of computer but it expanded rapidly.
8-Which of the following is not an unit for data transfer rate?
- MBPS KBPS 3. SBPS 4. GBPS
Ans-SBPS
9-Name two switching techniques used to transfer data between two terminals (computers).
Ans-
- Switching techniques used to .transfer data between two terminals are:
1- Circuit switching
2- Packet switching. - Name two transmission media for networking.
1-Optical fibre
2-Satellite.
10- State two reasons for which you may like to have a network of computers instead of having standalone computers.
Ans-The two reasons for networking are:
- It helps the user to share data files.
- It allows the user to communicate.
11-How bit rate is differ from baud rate?
Ans-
Bit rate
The number of bits transmitted during one second
Bit rate = Number of bits/second
Baud rate
It refers to the number of signal units per second that are required to represent those bits.
Baud rate = Number of signal/second
Baud rate = bit rate/N
where, N is the number of bits represented by each signal shift.
12-How is co-axial cable different from optical fibre?
Ans- The data transmission characteristics of co-axial cable are considerably better than twisted pair but not better in relation to optical fibre.
[Remember : Optical Fibre > Coaxial Cable > Twisted Pair Cable]
The co-axial cable is being used as a shared cable network, with part of the bandwidth being used for data traffic.
Optical fibre is difficult to install because they are fragile and need special care to install.
One of the major advantage of optical fibre over co-axial cable is its complete immunity to noise, because the information is travelled on a modulated light beam.
13-Differentiate between Internet and Intranet.
Ans-
Internet
A vast international network that is the most preferred WAN across the globe by joining computer networks together with telephone lines to form a backbone
Intranet
A network that exists exclusively within an organization and that is based on Internet technology.
14-Which type of network (out of LAN, PAN and MAN ) is formed, when you connect two mobiles using bluetooth to transfer a picture file?
Ans- When two mobiles are connected using Bluetooth to transfer a picture file, a PAN(Personal Area Network) is created.
15-What is the difference between HTTP and FTP?
Ans- FTP is a protocol used to upload files from a workstation to a FTP server or download files from a FTP server to a workstation.
HTTP is a protocol used to transfer files from a web server onto a browser in order to view a web page that is on the Internet.
16-In networking, what is WAN? How is it different from LAN?
Ans- The network which connects the different countries network is known as WAN. It can be a group of LANs. The largest existing WAN is Internet. LAN is a group of computers and network devices connected together, usually within the same building whereas WAN is not restricted to geographical location, although it might be confined within the bounds of state or country.
17-What is the advantage of using SWITCH over HUB?
Ans- Switch provides a dedicated line at full bandwidth between two devices but hub doesn’t provide a dedicated line. Hub share the bandwidth.