Class 10 Computer Engineering Computer Network (Supplementary/Upgrade) 2073 (2017) Solved Question Paper

 

SEE (Supplementary/Upgrade) 2073 (2017)

Group A

1.       Mention two advantages of Computer Network.

à Two advantages of Computer network are:

·         It provides fast and easy way to communicate efficiently.

·         Network allows people to easily access their files form any computer throughout the network.

·         It allows us to share files and hardware resources.

 

2.       Define MAN.

à MAN is the type of computer network which is spread over the metropolitan area or city.

 

3.       Write any two advantages of Bus topology.

à Two advantages of bus topology are:

·         If one node fails, it doesn’t affect the whole network.

·         It is cheaper than star topology.

·         It is easier to setup.

·         It is easy to understand.

·         Length of cable required is less than a star topology.

·         Easy to expand by joining the two cables together.

 

4.       Define Gateway.

à A gateway is a network node used in telecommunications that connects two networks with different transmission protocols together.

 

5.       Write the full form of ISO-OSI model.

à The full form of ISO-OSI model is International organization for standardization – Open System Interconnection model.

 

6.       List any two different Network connecting device.

à Two different network connecting device are:

·         Router

·         Switch

·          

7.       What is cryptography?

à Cryptography is technique of securing information and communications through use of codes so that only those person for whom the information is intended can understand it and process it.

Group B

8.       Why is wireless network popular?

à Wireless network is popular for the following reasons:

·         Portable and mobile

·         Cheaper as it doesn’t require any cables

·         Easy to  setup

·         Wider Reach of the Network

 

9.       Describe LAN in brief.

àLAN is the computer network that interconnects computers within limited geographical area such as school, laboratory, college or office building. LAN is smaller, cheaper, and simpler than other networks. The number of computers in LAN may vary from just two or three to hundreds or thousands. LANs are typically owned, managed and controlled by single organization or person. The data is transferred at an extremely faster rate in LAN and it also provides higher security than other networks.

 

10.   Draw the figure of Bus topology

àNote

 

11.   List out any two advantages of ring topology.

à Two advantages of ring topology are:

·         This topology helps to reduce the chance of data collision.

·         Cheap to install and expand.

·         Addition of component doesn’t affect the performance of network.

·         Data traffic is reduced as data flows in only one direction

·         Each computer get equal opportunity to access the network resources.

 

12.   Why is Hub used?

àHub is used to connect multiple devices in a network generally in star topology.

 

13.   Define NIC.

àNIC is a hardware component typically a circuit board or chip, which is installed on a computer to provide dedicated network connection to the computer.

 

14.   Define OSI reference model. Why is it reference model? *

àOSI model is the conceptual model that standardizes and characterizes the communication functions of computing system or telecommunication. It is reference model because it is a generic model and acts as a guidance tool to develop any network model.

 

15.   List out any two functions of Presentation layer.

à 

Two functions of Presentation Layer are:

·         Translation: The processes in two systems exchange the information in the form of character strings, numbers and so on. Different computers use different encoding methods, the presentation layer handles the interoperability between the different encoding methods. It converts the data from sender-dependent format into a common format and changes the common format into receiver-dependent format at the receiving end.

·         Encryption/Decryption: The presentation layer encrypts the data at the sender's end and decrypts at the receiver's end.

·         Compression: It reduces the number of bits that need to be transmitted on the network.

16.   Name any three unguided transmission medium.

àThree unguided medium are:

·         Microwave

·         Satellite

·         Infrared

·         Radio waves

17.   Differentiate between TCP UDP

 

18.   What is Firewall?

àFirewall is a network security system that analyzes and controls the incoming and outgoing network traffic based on the predetermined security rules.

Group C

19.   Explain Home application of computer network.

à Note(after past question)

20.   What is MAN? Explain with example.

àNote

 

21.   Explain ring topology with diagram.

àNote

 

22.   Compare between peer to peer and client server architecture.

 

 

à

 

34.   Explain Network layer of OSI model.

à Network layer works for the transmission of data from one host (machine) to other host located in different networks. It also takes care of packet routing i.e. selection of shortest path to transmit the packet, from the number of routes available. The sender and receiver’s IP address are placed in the header by network layer. Network layer is implemented by networking devices such as routers.

Function of Network layer:

·         Routing: The network layer determine which route is suitable from source to destination. This function of the network layer is known as routing.

·         Logical Addressing: In order to identify each device on internetwork uniquely, the network layer defines an addressing scheme. The sender & receiver’s IP addresses are placed in the header by the network layer. Such an address distinguishes each device uniquely and universally.

·         Data Fragmentation: It deals with the fragmentation of data.

·         Internetworking: It deals with the internetworking between the two different subnets.

 

35.   Explain coaxial cable with neat and clean diagram.

à Coaxial cable is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric (insulating material); many coaxial cables also have a protective outer sheath or jacket.

Coaxial cable has a central core of stiff copper conductor for transmitting signals.  This is covered by an insulating material. The insulator is encased by a closely woven braided metal outer conductor that acts as a shield against noise. The outer conductor is again enclosed by a plastic insulating cover. The structure is shown in the following figure −

Coaxial cable carries data signal of higher frequency and at a faster speed than twisted pair cable. Its common use is for the transmission of signals in cable television system and broadband transmission. Coaxial has a large bandwidth and it is able to carry signals over a significant distance. However, it is difficult to install and bend as compared to twisted pair.

Types of coaxial cable:

·         Baseband transmission (Thinnet): A baseband coaxial cable transmits a single signal at a time at very high speed. A baseband cable is mainly used for LANs. It is suitable for 185m communication. They are 50 ohm cables that used for digital transmission. It supports frequency range of a 4kHz.

·         Broadband transmission (Thicknet): A broadband coaxial cable transmits a multiple signal simultaneously. It is suitable for 500 m long communication. They are 75 ohm cables used for analog transmission. It supports frequency range above 4 kHz.

 

36.   Point out any two functions of following layer of OSI Model.

a.       Physical Layer:

                                                               i.      It provides an interface between devices (like PC’s or computers) and transmission medium.

                                                             ii.      Physical Layer maintains the data rate (how many bits a sender can send per second).

                                                            iii.      It performs Synchronization of bits.

b.      Data Link layer:

                                                               i.      Framing: Data-link layer takes packets from Network Layer and encapsulates them into Frames. Then, it sends each frame bit-by-bit on the hardware. At receiver’ end, data link layer picks up signals from hardware and assembles them into frames.

                                                             ii.      Physical Addressing: This layer adds MAC (media access control) of sender and/or receiver in the header of each frame.

                                                            iii.      Error control: Data link layer provides the mechanism of error control by adding trailer at the end of each frame in which it detects and retransmits damaged or lost frames.

                                                           iv.      Flow control: If the rate at which the data are consumed by the receiver is less than the rate produced by the sender, the data link layer deals with a flow control mechanism to prevent overrun the receiver

                                                             v.      Access Control: When a single communication channel is shared by multiple devices, MAC sub layer of this layer helps to determine which device has control over the channel at the given time

c.       Transport Layer:

                                                               i.      Segmentation and Reassembly: This layer accept the message from the (session) layer, breaks the message into smaller units. Each of the segment produced has a header associated with it. The transport layer at the destination station reassembles the message.

                                                             ii.       Service point addressing: In order to deliver the message to correct process, transport layer header includes a type of address called service point address or port address. Thus by specifying this address, transport layer makes sure that the message is delivered to the correct process.

                                                            iii.      Error control: it provides the mechanism of error control in which it detects and retransmits damaged or lost segments.

                                                           iv.      End to end message delivery

                                                             v.      Multiplexing and de-multiplexing the data

d.      Application Layer:

                                                               i.      This layer allows users to access, retrieve and manage files in a remote computer.

                                                             ii.      This layer provides access to global information about various services.

                                                            iii.      It provides email services

                                                           iv.      It provides a virtual network terminal through which a user can log on to the remote host on the network.