Compare and contrast a data hub, a switch, and a router

Q1) Compare and contrast a data hub, a switch, and a router.

A Data Hub: It is a simple network device which is used to connect multiple computers together - Compare and contrast a data hub, a switch, and a router introduction. It is classified as layer 1 (physical layer) device in the OSI model. It is used to broadcast any input to it so that all the receivers can receive it. A hub does not read any of the data passing through it and is not aware of the source or destination. It receives incoming packets, amplifies the electric signal and broadcasts these to all devices in the network.

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A Switch: It is also a network hardware device which is used to connect multiple computers together but within a local area network only. It operates at layer 2 (data link layer) of OSI model. A switch is a device which is capable of reading data packets as they are received, determining the source and destination of that packet and forwarding them appropriately. Thus it can be considered more intelligent than a data hub.

A Router: A Router is a physical device which is used to connect multiple wired or wireless networks together. It operates at the layer 3 (network layer) of the OSI model. It is a device which joins the home’s LAN to the WAN of the Internet. The routers are used to filter the traffic, either incoming or outgoing, based on the IP addresses of the sender and receiver. Routers serve as intermediate destination for network traffic. These routers receive packets, look inside each packet to identify the source and destination IP addresses and then forward these packets to its destination.

A router is used for the purpose of internet connection while neither a hub nor a switch is capable of joining multiple networks or sharing an internet connection.

Q2) Compare and contrast the following network models: ASP, client/server, peer-to-peer. Focus your analysis in the performance benefits and liabilities of each.

In a local area network, basically we have two types of networks: peer-to-peer and client/server.

In a peer-to peer network, each computer is an equal participant on the network. The access to the network is not centrally controlled. The PCs are not reliant on one PC for resources. They can operate on basic PC operating system. They are generally simpler and lower in cost. But it is limited in extensibility. It is home based choice where the users are less. The security is not of more concern in peer-to-peer network.

The client/server network has a central authority that controls the communication and access to the resources on the network. The centralized controlling PC is called the server. The server generally has a bigger processor and more storage than other PCs, or the clients on the network. The client/server network needs special operating system.They are generally more complex but they give the user more control. It can extend to handle organizational growth and allows user workstation to function as unburdened clients. It is configurable for maximum security. But it needs higher initial investments to establish and an expert to configure and manage. The client/server is ultimately the best choice where the growth is expected, security is a major concern, and where there is no need of system wide services.

ASP stands for Application Service Provider. It provides computer based services to customers over a network. It provides access to particular application programs using a standard protocol such as HTTP. Some of the features of ASP include:

ASP owns, operates and maintains the server that supports the software.
It makes information available to customers via the internet.
It improves the reliability, availability, scalability, and security.
It manages and distributes software-based services and solutions to customers across a wide area network. They provide applications for a specific need, provide support to a specific industry, deliver high-end business applications. It is a service provider whose specialization is the implementation and ongoing operation management of one or more networked applications on behalf of its customers.

The ASP model has some significant advantages over traditional approaches:

Low cost of entry and short setup time.
It can shift internet bandwidth to the ASP.
It eliminates specialized IT infrastructure for the application as well as supporting applications.

Q3) Compare and contrast intranets and extranets

An intranet is a private network inside a company or organization that uses the same kinds of software that one would find on the public Internet. It is a collection of private networks within an organization .It is a private business network which uses the same structure and network protocols as the internet. It is protected from unauthorized users by a firewall. It offers broad bandwidth which enables users to use far more quickly than over the internet. The main benefits of an intranet are:

·      better internal communication

·      improved customer service.

·      Sharing of resources.

An extranet is an intranet which is accessible to computers that are not physically part of a company’s own private network. It is not accessible to the general public to allow vendors and business partners to access a company web site. It is a computer network which allows controlled access from the outside for specific purposes. It can provide remote access to systems that spend lots of time outside the office. The benefits of extranet are:

·      Improved security of communication.

·      Improved customer service.

·      Provides a single user interface between the individual and the business partner.

·      Flexibility in working

Q4) Compare and contrast eBusiness and eCommerce.

eBusiness is an acronym for electronic business. It can be defined as the electronic process that relies on an automated information system. It is a web based technology which enables companies to link their internal and external data processing systems.

It is more than just e-commerce. Ebusiness lays emphasis on the functions that occur using electronic capabilities; eCommerce can be called a subset of an overall eBusiness strategy. eCommerce uses the worldwide web or the internet to build the relationship with the clients.

eBusiness involves business processes covering the electronic purchasing and supply chain management. It is used to process orders electronically, handles customers service. eBusiness can be conducted using the web, the internet, intranets, extranets, or combination of these.

eCommerce on the other hand is an acronym for electronic commerce. It consists of distributing, buying, selling, marketing and servicing over electronic systems such as internet (http://en.wikipedia.org/wiki/Ecommerce). It uses electronic communication technology of the worldwide web.

The difference between eBusiness and eCommerce can be stated as:

eCommerce is a part of eBusiness. Any transaction that results in a financial change is   e-Commerce. All business transactions be they financial or not is called e-Business.

References:

1. http://en.wikipedia.org/wiki/Ecommerce

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