Computer Networks And Communications Assignment

 

MOBILE COMPUTING

DEFINITION

Mobile computing means using a computing device while in transit. Mobile computingimplies wireless transmission, but wireless transmission does not necessarily imply mobilecomputing. Fixed wireless applications use satellites, radio systems and lasers to transmit between permanent objects such as buildings and towers.

SPECFIACTION, SERVICES AND FREQUENCIES OF MOBILECOMPUTING

SPECIFICATION

The S60 5th Edition has a lot of goodness in technology. It has3.5-inch TFT and 16 million colours. The widescreen also about mHDIt has 640×360 pixels and it use the Nokia Battery BP-4L that is about 1500 mAh. The memoryis about up to 48GB which is 32GB Internal Memory and 16GB Micro SD Expansion Slot. Themain camera use the Carl Zeiss Tessar Lens and it is about 5MP (2584 x 1938). The format of the picture is JPEG/EXIF (16.7 Million / 24-bit color) and the video capture is MPEG-4 VGA,640×480 at 30fps. The camera aperture is about F2.8 and the focal length is 5.4mm. Thistechnology use Dual LED Camera for the flash.

SERVICES

For its service, it has WLAN IEEE 802.11 b/g with UPnP support, Micro USB Connector  plus 3.5 mm stereo headphone plug. It also has TV-Out Support, data transfer via Bluetooth 2.0,A-GPS and Internet surfing

FREQUENCIES

Its frequencies are up to 2G Network GSM 850 / 900 / 1800 / 1900 and 3G Network HSDPA 900 / 1900 / 2100.

Computer Network Assignment Help Online

Computer network, by definition, is a set of computer system and other computing hardware devices interconnected for the purpose of sharing resources. Networks are commonly identified based on their characteristics. Availing professional computer network assignment help is the best way to improve your grades. If you decide to write a technical article on computer networking, you need to implement many technical facts in your writing. But how do you get hold of effective information? The answer is computer network assignment help offered by us.

Functions of computer networks

Computer network is used to link the different computer users within the defined parameters. Computer network assignment help experts highlight that the chief functions of computer networks are to store, update, share and classify data. Generally computers are linked to create a network via cables and electronic gadgets like modems. The networks are used to:

  • Facilitate communication via email, video conferencing, instant messaging etc
  • Allow multiple users to share a single hardware device like a printer or scanner
  • Enable file sharing across the network
  • Allow sharing of software or operating programs on remote systems
  • Make the information easier to access and maintain among network users.

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Types of computer network

The most common categories of computer network are described in details below by our experts:

WAN (Wide Area Network)

WAN is defined as the computer network that covers a broad area which may span across provinces and even whole country. In the sector of telecommunications, this type of system is utilized. This network is of extreme high speed. So the users have to spend a huge amount of money to get the services from this network.

Government entities, business organizations and other education facilities use WAN to get connected and transmit data to each other. Different technologies are used to develop the wide area network links from integrated telephone lines, radio wave transmission and the optical fiber. The speed of the WAN has increased radically in the last few decades. From 110 bits per second in the year 1960 to up to 100 G/bits per second now, the speed has improved exponentially.

LAN (Local Area Network)

A network system installed in a building and operated under single administrative system is known as LAN. Generally, this type of network is used in organization’s offices, schools, colleges/universities, etc.

Usually, the LAN has a server of its own which has its own applications and storage systems that are shared among the users. From two to a few hundred, the number of users within the LAN network can vary. Today, Ethernet and Wi-Fi are the most common forms of LAN usage. A wireless LAN is always preferred to wired LAN due to its effectiveness, flexibility and cost. Simple LANs comprises of two to three switches which are connected to the router or modem for internet access. A complex LAN consists of several switches which uses a spanning tree protocol to prevent loops and manage more volumes of data transmission.

Internet

This network is mostly used in recent private, public, business, academic and government networks connected and guided by wireless and fiber-optic technologies. Computer network assignment help experts highlight internet as a network of global exchange connected by network system that uses TCP/IP to transmit data.
It is also referred to as Internet Area Network which is envisioned as the ideal networking model for the future. It connects all the endpoints through the public web, enabling the transmission of data and exchanging information possible without getting bound to a physical location. The rise of Internet Area Network is based on cloud computing. In the last one decade, high capacity networks and peer-to-peer architecture have paved the way for the popularity of internet networking.

MAN (Metropolitan Area Network)

This type of network facilities equips the whole city such as cable TV network. It can be used in various forms like Ethernet, Token-ring, ATM or FDDI. With accordance to the area of coverage, a MAN network covers larger area than LAN but smaller than WAN. MAN links generally use microwave, radio or infra-red laser transmission to connect between two LANs.
MANs are used to build high speed network for cities and towns which is effective due to its medium range. The network of MAN can extend up to 40 kilometers maintaining its speed and effectiveness. These days MAN networks work on Distributed Queue Dual Bus (DQDB) with IEEE 802.6 standard of data communication giving a speed of transmission up to 155 Mbps.

WLAN (Wireless Local Area Network)

This network is very similar to LAN, but they do not require wires to connect each other. Radio and infrared signals are ideal examples of WLAN. As it is wireless, it gives all the users within the range of its effectiveness to move around without losing connection.
The IEEE 802.11 defines the functionality of WLAN into two basic modes, namely, infrastructure and ad hoc mode. In the ad hoc mode, the units or clients transmit directly peer-to-peer while in the infrastructure mode, the units communicate through a specific access point. The most recent standard of WLAN is 802.11g offering a speed of around 150 Mbps per channel.

CAN (Campus Area Network)

A network that connects many small LAN networks is named as CAN. It allows easy file sharing between different departments as all the files are usually shared on the server machine.
CAN is a form of smaller MAN network but with a shorter range of effectiveness. The networking equipments and transmission media are owned by the authority itself which uses FDDI, ATM, Token Ring and fast Ethernet to get connected. The range of CAN varies but it can be effective with an area about 8-10 km2. CAN is used in the corporate offices where the employees require high speed data link.

SAN (Storage Area Network)

This network is mostly used as information database, not often used by organizations or any similar entities. This network is implemented on the websites that offer downloading services.
A Storage Area Network or SAN is assembled using three principle components: cabling, Host Bus Adapters and switches. The SAN moves the storage resources from the common network reorganizing them into a high speed and independent network. Every server, whenever required, can access this storage. A SAN cannot perform file abstraction and it can be used for only block-level operations. It uses ATA, Fiber Channel Protocol and SCSI protocol for communication between servers and disk drive services.

PAN (Personal Area Network)

This network is used for communicating between more than one or two computers and computer devices (including telephones) within around few meters within a room.
When a person works in his individual laptop, connected with a printer which is also attached with his smartphone using wireless technology, it can be referred to as the simplest form of Personal Area Network.

This wireless PAN is based on the standard IEEE 802.15. Bluetooth and Infrared data transmission falls under the category of PAN.

SAN (System Area Network)

This network is linked to high performance computers with high-speed connections in a cluster configuration. It is also known as Cluster Area Network.
System Area Network is capable of delivering very high bandwidth up to 1 Gbps with a very low latency. A SAN is used to interconnect all the nodes within a distributed computer system referred to as a cluster. It is known for its security and low error rates. SANs are especially effective for bulk data transfer as it uses Remote Direct Memory Access Mechanism.

Advantages and disadvantages of computer networking

Computer networking has of late become the face of computing, allowing the user to connect across the globe as if they were in the same room. Computer network assignment help experts evaluate its negative aspects too like security risks, workplace distractions etc.

Cost

Computer network assignment help experts highlight cost as one of the major cons of network. If you are setting a network for the purpose of business, you need to spend thousands of dollars to install it. Computer network assignment help experts suggest, even in a small business, simple network equipments like modem and routers can cost big.

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