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Class C address block specifies the first 3 bytes of address, for example This allows room for individual addresses from Proxy servers are related to firewalls prevents hosts on a network from making direct connections to the outside world, a proxy server can act as a go-between. Thus a machine that is prevented from connecting to the external network by a firewall would make a request for a web page from the local proxy server instead of requesting the web page directly from the remote web server.
HTTP is a standard protocol that defines how a web client talks to a server and how data is transferred from the server back to the client. It also lets the recipient know what kind of data has been sent, so that it can be displayed properly. MIME was originally designed to facilitate multimedia email and to provide an encoding that could get binary data past the most train —damaged mail transfer programs. MIME is an open standard for sending multipart, multimedia data through Internet email.
Uniform Recourse Locator is a way to unambiguously identify the location of a resource on the Interned. URI Uniform Resource Identifier is a string of characters in a particular syntax that identifies a resource. URNs — Uniform Resource Name is a name for a particular resource but without reference to a particular location. HTTP specifies how a client and server establish a connection, how the client requests data from the server, how the server responds to that request, and finally how the connection is closed.
HTTP 1. It uses MIME to encode data. The basic protocol defines a sequence of 4 steps for each request from a client to the server. A table is a two dimensional matrix, consisting of rows and columns.
There are 3 attributes that can be introduced in BODY tag. ALINK — Changes the default color of a hyperlink that is activated to whatever color is specified with this tag.
VLINK — Changes the default color of a hyperlink that is already visited to whatever color is specified with this tag. Linked regions of an image map are called hot regions and each hot region is associated with.
HTML form provides several mechanisms to collect information from people viewing your site. The syntax of the form is. Most Internet Service Providers will have a script like this on their site. They are 1. Label 2. Text box 3. Text Area 4. Radio button 5. Check box 6. List box 7. Command button 8. Scroll bars. Frames are used to call many html files at the same time.
ROWS — This attribute is used to divide the screen into multiple rows. It can be set equal to a list of values. Depending on the required size of each row. The values can. A node is any addressable device connected to a network whereas the host is a more specific descriptor that refers to a networked general-purpose computer rather than a single purpose device such as a printer. A port is a logical channel to an application running on a host. Port numbers can range from 1 to , however ports 1 to are reserved.
These reserved ports are referred to as we1l-known ports because the Internet Assigned Numbers Authority publicly documents the applications that use them. Name Resolution is the process of mapping a hostname to its corresponding IP Address. One way to translate a hostname to an IP address is to look it up in a simple text file. The second way is the domain name service, which is a distributed database containing all registered hostnames on the Internet and their IP addresses.
What are the sequences of steps for each HTTP request from a client to the server? A zone that enables the server to direct traffic to itself. The host number is almost always It is a communication channel between web browser and web server. It begins on the client side with the browser sending a request to the web server for a document. It is a program or web page that enables you to search an Internet site for a specific keywords or words. When you enter a keyword, the search engine examines its online database and presents to you a listing of sites that, in theory , match your search criteria.
HyperText Markup Language. It is very simple and allows for the embedding of images, sounds, video streams, form fields and simple text formatting. References to other objects are embedded using URLs. How would you make all text on a page green and a little larger than normal, but make all headings yellow?
How would you insert an image file named elephant. How would you give a Web page a black background and make all text, including links, bright green? How would you wrap text around the right side of an image, leaving 40 pixels of space between the image and the text?
Create a small image that is all one color, and save it as nothing. Then put the following tag between the two paragraphs of text:.
If you have a circular button that links to another page, how do you prevent a rectangle from appearing around it? When a web server receives a HTTP request from a web browser it evaluates the request and returns the requested document, if it exists, and then breaks the HTTP connection. This document is preceded by the response header, which has details about how to display thedocument that will be sent by the server.
Each time a request is made to the server, it is as ifthere was no prior connection and each request can yield only a single document. This isknown as Stateless Connection. Post a comment. Where is the Menu? How to request Study Material? About Us Vidyarthiplus. Search for:.
Network is an interconnection of systems to share data and information. Internet is network of network or collection of heterogeneous networks. It is very difficult to remember the IP address of each and every node.
It order to avoid this problem domain names are used. Example googl. HTTP relies heavily on two other standards. Standard protocol for communication between web browsers and web servers. Making the connection Making a request Receiving the response Closing the connection Row spanning is used to merge combine two or more rows.
Column spanning is used to merge combine two or more columns. NOTE: User can specify the color name of a hyperlink or an equivalent hexadecimal number. Linked regions of an image map are called hot regions and each hot region is associated with a filename. HREF — Takes the name of the. Scroll bars COLS — This attribute is used to divide the screen into multiple columns. What is the difference between node and host? Define protocol. A protocol is a formal set of rules that must be followed in order to communicate.
Define port. What do you mean by well-known ports? What is meant by Name Resolution? The components are host, an optional port, path, filename, section and query string.
Define URL encoding. What are the issues of next generation IP? List the goals of SGML. What is the role of server? What are the necessities of using HTML forms? Gathering user information 2. Conducting Surveys 3.
Department of Computer Science and Engineering
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