Protocols and networks in the TCP/IP model initially.

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Presentation transcript:

Protocols and networks in the TCP/IP model initially. Reference Models Protocols and networks in the TCP/IP model initially.

Reference Models Physical Layer / Data Link Network Layer mechanical, electrical, and timing interfaces to the network algorithms for reliable, efficient communication between two adjacent machines Network Layer getting packets form the source all the way to the destination (end-to-end transmission) The Transport Layer reliable, cost-effective data transport form the source to the destination machine, independently of the physical network The Application Layer programming that does a real work for users determines the presentation of the data and controls the session

Connection Establishment (Transport Layer) How a user process in host 1 establishes a connection with a time-of-day server in host 2.

The Application Layer Domain Name System Electronic Mail WWW other The DNS Name Space Resource Records Name Servers Electronic Mail The User Agent Message Transfer Final Delivery WWW other

A portion of the Internet domain name space. The DNS Name Space A portion of the Internet domain name space.

A portion of a possible DNS database for cs.vu.nl. Resource Records A portion of a possible DNS database for cs.vu.nl.

Part of the DNS name space showing the division into zones. Name Servers Part of the DNS name space showing the division into zones.

How a resolver looks up a remote name in eight steps. Name Servers (2) How a resolver looks up a remote name in eight steps.

Electronic Mail Agent Transfer Final Delivery any interface for e-mail SMTP; simple mail transfer protocol – TCP connection to port 25 for simple ASCII protocol. Final Delivery POP; post office protocol; ‘pop’ the message from server IMAP; internet message access protocol; multiple features – creating and desrtoying mailboxes… Webmail; mail through browser

A comparison of POP3 and IMAP.

The World Wide Web Static Web Documents Dynamic Web Documents HTTP – The HyperText Transfer Protocol

URLs – Uniform Resource Locaters Some common URLs.

Statelessness and Cookies Some examples of cookies.

HTML – HyperText Markup Language (b) (a) The HTML for a sample Web page. (b) The formatted page.

Multimedia Introduction to Audio Streaming Audio Internet Radio Introduction to Video Video on Demand