This is a protocol used in moving the web pages successfully across the internet. In order to guarantee and orderly and correct delivery of data, it depends on TCP in the network. SNMP – This is a protocol which helps in managing and monitoring systems in a network. It defines a method to send queries and commands from a client to a server and also collecting responses together with unsolicited notifications of an event. It uses UDP to send traffic due to its simplicity plus low overhead.
You can now type http commands (you are connected to an http server, so it supports http commands). Ie. on an ftp server you can type open and it will do something. On an http server it will just wonder what the hell you are on about. Type get / http/1.
· routers, like every other device on the network, send and receive data on the network, and build ARP tables that map IP addresses to MAC addresses · if the source resides on a network that has a different network number than the desired destination, and if the source does not know the MAC address of the destination, it will have to use the router as a default gateway for its data to reach the destination · routed protocols direct user traffic, whereas routing protocols work between routers to maintain path tables · network discovery for distance-vector routing involves exchange of routing tables The next chapter discusses the functions of the transport layer. Bibliography: www.news.com
Web servers are important in today’s internet market, they implement the Hyper Transfer Protocol (HTTP) and it can be run by any computer. It could be used in a local network as well on a wide diversity web site around the globe, enabling user to read information from various resources. A web server enables users to move from one site to another by links call Hypertext Markup Language (HTML). This hyperlinks are the responsible of setting fonts, emending related files (e.g. graphics), and setting fonts in web pages.
The transport control protocol (TCP) is the backbone of the Internet; it is basically how data packets are sent to their destination from where they are originally. This protocol helps connect two networks together, so that the IP address protocol can deliver the packets. The protocol makes sure that the data is delivered exactly the way it was sent, by doing error checks. Web browsers use this protocol to send emails and connect to the World Wide Web servers. Application
Therefore understanding how the Internet works is quite important to better understand E-commerce and to develop E-commerce applications. In this paper I will discuss the mechanisms and process of the Internet. The structure of the paper is as follows: · The Basic Process · Mechanisms of the Internet · IP address and Name Servers · Ports and Protocols II. The Basic Process When we surf the web, we type any URL in to our browser, and the desired page pop up on our screen. At the most basic level possible, the following diagram shows what happened: Our browser formed a connection to a web server, requested a page and received it.
'Routers' which are boxes of circuit boards and microchips, which do the essential task of directing and redirecting packets along the network. Much smaller boxes of circuit boards and microchips called 'modems' do the task of interpreting between the phone lines and the computer. The packets are all switched into a destination and reassembled by the destination computer. Today's Internet contains enough repetitious and interconnected circuits simply to reroute the data if any portion of the network goes down or gets overloaded. The packet-switching nature of the Internet gives it sufficient speed and flexibility to support real-time communication, such as sending messages to other people in a chat environment (IRC).
2.2. THE WORLD WIDE WEB (WWW) It is a public hypertext internet-based system that lets you check, with a browser, accessible pages on websites. 1. The basis of the Web: the hypertext system Hypertext is a communication system connecting different elements to each other by a (hyper) links: - Language of communication from machines between them: the Hyper Text Transfer Protocol (HTTP) sites are identified by their web address (URL: Uniform Resource Locator) it depends essentially on domain name (ex: http://www.lost.com)(short cut for address IP, ex:.com,.org,.edu,.fr,.de,.co.uk,.gov.fr,.tv, etc...) - Language of navigation from one web page to another: it moves from one web page to another (written in HTML: Hyper Text Mark-up Language) by clicking on a hyperlink. 2.
1. INTRODUCTION Universal Plug and Play (UPnP) is a standard that enables devices such as computers, other wireless devices, and intelligence appliances1 to be plugged into the same network and be familiar with each other’s existence. UPnP works by users plugging devices into a network with the configuration taken care of, it then obtains a TCP/IP address which is the internet’s communication protocol, and is also applicable to private networks whether an extranet or intranet2. It then uses another protocol which is HTTP, this is the internet’s hypertext transfer protocol and this broadcasts the different devices on the particular network3. UPnP has been deployed but there is uncertainty whether there was adequate consideration concerning its robustness as this may result in safety implications for users.
If we compare SSH to Telnet, it is easy to say that SSH is much better than the telnet because SSH uses encryption and decryption feature for the security prospects. Likewise comparison between HTTPS (SSL via HTTP) and simply HTTP is feasible. In this case HTTPS uses secure socket layer protocol to access secured webpages with necessary security certificates. On the other hand we use HTTP to simply browse webpages which are often vulnerable to any kind of threats.