Network Layer - E-Commerce - Lecture Slides, Slides of Fundamentals of E-Commerce

Download Network Layer - E-Commerce - Lecture Slides and more Slides Fundamentals of E-Commerce in PDF only on Docsity! 1 The Network Layer in the Internet Docsity.com 2 Overview
Internet Intro
The IP Protocol
IP Addresses
Subnets
Internet Control Protocols
CIDR – Classless InterDomain Routing
IPv6 Docsity.com 5 Internet Intro
The glue that holds the Internet together is the network layer protocol, IP (Internet Protocol).
Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind.
A good way to think of the network layer is this: its job is to provide a best-effort way to transport datagrams (packets) from source to destination, without regard to whether or not these machines are on the same network, or whether or not there are other networks in the between them. Docsity.com 6 Internet Intro
Datagram – in the context of the internal operations of the subnet, a connection is usually called a virtual circuit (in analogy with the physical circuits set up by the telephone system). The independent packets of the connectionless organization are called datagrams, in analogy with telegrams. Docsity.com 7 Internet Intro
Communication in the Internet works as follows: • The transport layer takes data streams and breaks them up into datagrams. • In theory datagrams can be up to 64KB each, but in practice they are usually around 1500bytes. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. • When all the pieces finally get to the destination machine, they are reassembled by the network layer into the original datagram. • This datagram is then handed to the transport layer, which inserts it into the receiving process’ input stream. Docsity.com