Network
A. Fill in the blanks with the help of the given words.
1. A network in a confined are such as an ethernet is Local Area Network.
2. Bluetooth technology is a wireless technology.
3. Modem converts digital signals from the computer in another form that can be transmitted over telephone wires and vice versa.
4. The RJ-45 connector is commonly used for computer network cables.
5. Office is a networking technology used in LAN and MAN networks.
B. Tick (✓) the correct answer.
1. A network that is spread across cities, countries or continents.
a. WAN. [✓]
b. LAN. [ ]
c. PAN. [ ]
d. CAN. [ ]
2. A device which regenerates the incoming signal and again places it on the communication channel.
a. Bridge. [ ]
b. Hub. [ ]
c. Repeater. [✓]
d. Modulator. [ ]
3. A device that is used to link two same network.
a. Network. [ ]
b. Bridge. [✓]
c. Switch. [ ]
d. Plug. [ ]
4. The arrangements of the nodes connected in a network.
a. Network. [ ]
b. Topology. [✓]
c. Channel. [ ]
d. Partway. [ ]
5. What is used to transmit data from the network to your computer with the help of a network cable?
a. NIC. [✓]
b. IP. [ ]
c. Ethernet. [ ]
d. DP. [ ]
6. Which of the following is not a cloud-based service?
a. OneDrive. [ ]
b. GDrive. [✓]
c. Apple's iCloud. [ ]
d. Dropbox. [ ]
C. State True or False.
1. Internet is also a type of network. [T]
2. A Metropolitan Area Network is a network spread over an entire continent. [F]
3. Bluetooth technology is a standard for exchanging of data over long distances. [F]
4. Radio Link is a wireless interface. [T]
5. Star topology is more reliable than ring topology. [T]
6. OneDrive has a free online 17GB storage space. [F]
D. Answer the following questions.
1. What is a network?
= When two or more computers or peripherals are connected together for sharing data(files) or hardware resources such as printer, then they form a network.
2. List the components that are required for wired and wireless communication.
= Computers in a network can be wired (cables) or wireless(through radio signals, satellite, etc.).
The various types of transmission medium are: Twisted pair cable, Coaxial cable, Optical fibre, Radio Link, Satellite link and Infrared Transmission.
i) Twisted Pair Cable:- It consists of two insulated copper wires that are twisted together. The cable can cover a long distance.
ii) Coaxial Cable:- The data transmission characteristics of coaxial cable are much better than those of twisted pair cables. Coaxial cables are used by telephone companies, from their central offices to the telephones poles near the users.
iii) Optical Fibre:- It enables the digital data transmission over longer distances. It is also used as a medium for networking. The fibre of these wires is made of transparent plastic, gas or sometimes with a combination of both.
iv) Radio Link:- Radio Link is a wireless interface. The concept of radio link is used by cellular networks such as GSM(Global System for Mobile Communication) and CDMA(Code Division Multiple Access). The transmission is made by using radio frequencies.
v) Satellite Links:- The satellite is placed above the surface of the Earth. The function of the satellite is to receive data from the Earth Station and transmit the data to another station on the Earth.
vi) Infrared Transmission:- An infrared beam is used to replace the cables between rooms. This technique of data transmission is thus more suitable for offices where position of communication devices are changed constantly.
3. How are computer networks classified on the basis of geographical spread?
= Computer networks can be classified on the basis of geographical spread. They are -
i) Personal Area Network(PAN):- It is a network organized around an individual person. It usually involves a laptop, table or mobile phone. These devices are connected through a wired or wireless connection.
ii) Local Area Network(LAN):- It is a network is a confined area such as an office, a building or college campus is called Local Area Network(LAN). The basic purpose of LAN is to share resources.
iii) Campus Area Network(CAN):- Campus Area Network is an inter connection of local-area networks within a limited geographical space. It connects two or more buildings, such as a school campus.
iv) Metropolitan Area Network(MAN):- It is a network spread over an entire city. Hence, it is named as metropolitan. It is larger than LAN.
v) Wide Area Network(WAN):- In a WAN, the computers in a network are spread across the cities, countries or continents. It facilitates efficient exchange of information at a high speed. The Internet and ATMs are examples of WAN.
4. What is topology? Which topology is most reliable and why?
= Topology is the arrangement of the nodes connected to one another in a network. The most reliable topology is star topology. Because -
i) It is easy to add and remove nodes.
ii) If one connection fails, it does not affect other computers in a network.
iii) It has good network security as two nodes cannot communicate without going through the server.
5. Compare bus, star and ring topology. Write any four points to compare them.
=
|
Bus Topology |
Star Topology |
Ring Topology |
|---|---|---|
|
i. It consists of a long communication channel. |
i. It is consisted of a central point link called a hub or server. |
i. All the nodes are connected to each other forming a ring. |
|
ii. Both end of the cable is terminated. |
ii. The drop cables extend in all the directions. |
ii. The first and the last node connected to each other forms the
ring. |
|
iii. Less number of cable required. |
iii. Comparatively more cable required. |
iii. Less cable required. |
|
iv. If there is a problem in the main cable, the entire network stops
working., |
iv. If one connection fails, it does not affect o0ther computers in a
network. |
iv. If a singular node switched off, then, the network will not work. |
6. What do you understand by cloud computing ? List the advantages of cloud computing.
= Cloud computing in simple words means delivery of computing services. It provides a convenient environment where you can have access to share scalable resources, such as networks, servers, applications, services and storage whenever required.
The advantages of Cloud Computing are -
i) Universal Network Access:- Cloud computing allows you to work from anywhere3 over the network.
ii) Accessibility and flexibility:- You need only an Internet connection to share your files with friends.
iii) Reduced cost:- Cloud computing resources are only acquired when needed. Also, you are required to pay for the resources on cloud only when you use them. You need not worry about buying DVDs or flash drives to transfer data.
iv) Resource pooling and scalability:- The resources can be assigned or reassigned as per the requirement.
v) Data security:- You will not lose data as it is saved on the servers. In case, you think that is risk to your personal data, you can use a strong password.