Wireless and mobile computing important short question

Wireless and mobile computing important short question

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Q.1 Differentiate Mobile Computing and Wireless Networking.

Q.2 Differentiate Mobile Computing and Wireless Networking.

Q.3 What are the basic building blocks for Mobile Computing

Q.4 What are the different types of applications in which Mobile Computing is                 used?

Q.5 What is Wi-Fi?

Q.6 What is a Wi-Fi hotspot?

Q.7 What do you mean by frequency reuse ?

Q.8What are the different types of transmission impairment ?

Q.9 What do you understand by WLAN?

Q.10 What is the difference between 3G and 4G?

Q.11 What are IBSS and BSS?

Q.12 What Is Bluetooth?

Q.13 What information is stored on a SIM card?

Q.14 What is GSM in Mobile Computing?

Q.15 Explain the GSM System Protocol Architecture.

Q. 1 What is wireless communication concept ? Ans: wireless communication is the transfer of information between

two or more points that are not connected by any physical medium.Wireless communications can be via:

1. Radio communication

2. Microwave communication.

3. Light, Visible and Infrared communication.

Q.2 What is Mobile Computing? Or What do you understand by Mobile Computing?

Ans:- Mobile computing is a technology that allows transmission of data, voice and video via a computer or any other wireless-enabled device /mobile device such as a handheld computer, laptop, smartphones, PDA etc. without having to be connected to a fixed physical wire.

Mobile Computing is the process of computation on a mobile device. In this technology, a set of distributed computing systems or service providers and servers participate, connect, and synchronize through mobile communication protocols.

Q.3 What are the basic building blocks for Mobile Computing?

Ans:- Mobile Computing requires portable computing devices such as laptops, smartphones, handheld computers etc. along with mobile communication technologies to enable users to access the Internet and mobile data on their home or work computers from around the world.

Q.4 What are the different types of applications in which Mobile Computing is used?

Ans:- Mobile Computing is used in the following types of applications:

Mobile and wireless devices

Location dependent services

Modern Vehicles

Medical Emergencies

Replacement of wired networks

Infotainment Services

Business etc.

Q.5 . What is Wi-Fi?

Ans:- Wi-Fi is a technology that uses radio waves to provide network connectivity. A wi-fi connection is established using a wireless adapter to create hotspots - areas in the vicinity of a wireless router that are connected to the network and allow users to access internet services. Once configured, wifi provides wireless connectivity to your devices by emitting frequencies between 2.4 GHz - 5 GHz, based on the amount of data on the network.

Q.6 What is a Wi-Fi hotspot?

Ans:- A hotspot is a physical location where people may obtain internet access, typically using wi-fi technology, via a wireless local area network (Wlan) using a router connected to an internet service provider.

Q.7 What do you mean by frequency reuse ?

Ans:- Each cellular Base Station is allocated a group of radio channels to be used. These radio channels can be used by another base station which is at a suitable distance away from it.

                                            Frequency Allocation

Q.8 What are the different types of transmission impairment ?

Ans:- . When the received signal is not as same as the transmitted signal then it is known as Transmission impairment. Three different types of transmission impairment are:-

1. Attenuation.

2. Noise.

3. Delay Distortion.

Q.9 What do you understand by WLAN?

Ans:- WLAN is an acronym that stands for Wireless Local Area Network. It is a wireless distribution method for two or more devices that use high-frequency radio waves and often include an access point to the Internet. WLAN is the core concept of mobile communication. It facilitates users to move freely within the coverage area, such as a home or a small office while maintaining a network connection. Sometimes, WLAN is also called a local area wireless network (LAWN).

Q. 10 What is the difference between 3G and 4G?

Ans:- Following are the differences between 3G and 4G:-

1. 3G stands for 3rd generation as it is just that in terms of the evolutionary path of the mobile phone industry. 4G means 4th generation. This is a set of standard that is being developed as a future successor of 3G in the very near future.

2. 4G speeds are meant to exceed that of 3G.

3. 3G uses the technique of circuit switching while 4G uses the technique of packet switching.

Q.11 What are IBSS and BSS?

Ans:- Independent Basic Service Set (IBSS) allows two or more devices to communicate directly with each other without a need for a central device.

Basic Service Set (BSS) wireless LAN is established using a central device called an Access Point that centralizes access and control over a group of wireless devices.

Q.12 What Is Bluetooth?

Ans:-

Bluetooth is a wireless technology standard used to exchange data over short distances.

The data is exchanged from fixed and mobile devices by creating Personal Area Network with security at high level.

Bluetooth was originally conceived as a wireless alternate to RS-232 cables.

It resolves the problems synchronization by connecting several devices.

It requires a low-cost transceiver chip that needs to be included in all the devices.

The connections can be point to point or multipoint.

A built in verification and encryption is also provided.

Q.13 What information is stored on a SIM card?

Ans:- SIM has an ID number or IMSI, which stands for International Mobile Subscriber Identity. This number is used to identify the phone number to the network. SIM basically specifies our phone number but can also store contact information, telephone numbers, SMS messages, billing information and data usage etc.

The Card type, serial no, and the list of subscribed services.

Personal Identity Number(PIN)

Pin Unlocking Key(PUK)

An Authentication Key(KI)

Q.14 What is GSM in Mobile Computing?

Ans:- GSM is an acronym that stands for Global System for Mobile Communications (GSM). It is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices.

Q.15 Explain the GSM System Protocol Architecture.

Ans:- The GSM System protocol architecture can be defined as a layered model that allows communications between two different systems. The lower layers provide the services to the upper-layer protocols. Each layer passes suitable notifications to ensure the transmitted data has been formatted, transmitted, and received accurately.

See the following diagram of the GSM System protocol architecture:

The GSM System protocol architecture consists of the following protocols:

MS Protocols

According to the architecture, the MS protocol is assembled into three general layers:

Layer 1: The layer 1 specifies the physical layer. It uses the channel structures over the air interface.

Layer 2: The layer 2 specifies the data-link layer. The data-link layer is a modified version of the Link access protocol for the D channel (LAP-D) protocol used in ISDN, called Link access protocol on the Dm channel (LAPDm).

Layer 3: The layer 3 specifies the GSM signaling protocol. it is divided into three sub-layers:

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