Linux Networking Course
History
*Arpanet
*switched network
*TCP/IP
*spread in the 90's
TCP/IP
What is a protocol
*strict procedure how things are done
*communication between layers
*clearly defined interfaces
*data encapsulation
*example
TCP/IP protocol
*Application
*Transport
*Network
*Physical / Data link
Physical layer / Data link layer
*not much of a concern for us.
*different topologies (ethernet, wirless, DSL, modem etc)
*this is about the physical connection
*here the bits are shifted.
*how many Volt represent a 1, how many a 0
*ethernet address (HWaddr in Hex format)
Network layer
*IP ICMP
*IPv4 32bit written in dotted decimal notation
*65.212.180.178
*different classes
A starts with 0 B starts with 10 C starts with 110 D starts with 1110
*although outdated it roughly specifies the network and host part.
*Common now is the CIDR (Classless InterDomain Routing)