HyperText Transfer Protocol

1. HyperText Transfer Protocol Jacob Boston Josh Pfeifer

2. Overview Definition of HyperText Transfer Protocol How HTTP works How Websites work GoDaddy.com OSI Model Networking

3. Definition Hypertext Transfer Protocol (HTTP) is a communications protocol used to transfer or convey information on intranets and the World Wide Web. Its original purpose was to provide a way to publish and retrieve hypertext pages. Developed by the W3C and IETF

4. How HTTP works • Step 1: Parsing the URL • Getting ahold of document • Step 2: Sending the request • GETrequest-URI HTTP/version • Step 3: The server response • Located appropriate document and return it

5. Domain Names/IP Adresses • Domain Names • A simple file that attached with a name that mapped itself to a particular IP address. • Network Information Center • Made it easier to establish links with other computers • Godaddy • Internet Protocol • The language computers use to communicated over the internet

6. How Websites work. A website is typically a collection of web pages, graphics, and other elements which are linked together to form a larger, structured document (like an interactive book). All pages and other elements are placed in a folder on a host server. An internet address (URL) is assigned to this folder, so that when a browser asks for your site it will know where to look.

7. OSI Network Model • Open Systems Interconnection Basic Reference Model or OSI Seven Layer Model • OSI Model is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. • 7 Layers of the OSI Model: 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical

8. Application Layer Interfaces directly to and performs common application services for the application processes. It also issues requests to the Presentation layer. Network process to application. Presentation layer Responsible for the delivery and formatting of information to the application layer for further processing or display. Data representation and encryption. Session Layer Controls the dialogues/connections (sessions) between computers. It establishes, manages and terminates the connections between the local and remote application. Interhost communication.

9. Transport Layer Provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. End-to-end connections and reliability (TCP) Network Layer Provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks while maintaining the quality of service requested by the Transport layer. Path determination and logical addressing (IP)

10. Data Link Layer Provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer. Physical addressing (MAC & LLC) Physical Layer The physical layer is the most basic network layer, providing only the means of transmitting raw bits rather than packets over a physical data link connecting network nodes. Media, signal and binary transmission ACTIVITY

12. Networks • Definition: The communications media, devices, and software needed to connect two or more computer systems or devices. • Network Nodes • Networking Trends • Increasing among businesses

13. Types of Networks • Personal Area Network (PAN) • Local Area Network (LAN) • Metropolitan Area Network (MAN) • Wide Area Networks (WAN) • International Networks • Network Topology • Logical model that describes how networks are structured or configured.

14. Information Covered Definition of HyperText Transfer Protocol How HTTP works How Websites work GoDaddy.com OSI Model Networking

15. Questions?