Computer Networks 0001-History, Standards Gergely Windisch

How networks came to be How Networks came to be – sharing resources – need for remote terminals

How networks look like Client - server model

How networks look like Client - server model

How networks look like Peer - to - peer

Standards Why standards matter IEEE ISO RFC – Internet Engineering Task Force

Standards Source:

Basic concepts Serial / parallel

Basic concepts simplex / duplex / half-duplex

Basic concepts synchronious / asynchroniuous

Basic concepts data rates – bit, Mbit, Gbit etc. – ates

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts topological classification – star – ring – tree – bus – mesh

Basic concepts packet switched / circuit switched

Network classifications Transport medium Size

Transport medium Wired Wireless

Transport medium Wired – Copper based – Optical fiber Wireless – radiowaves – laser – microwave

Transport medium Wired – Copper based Coaxial Twisted pair – Optical fiber Thin, not so thin

Coaxial TV, Computers

Twisted pair UTP, STP

Twisted pair Wiring - Straight vs crosslink

UTP categories Cat3, Cat5, Cat5e, Cat6 – How many twists per meter, which pairs to use etc. – Higher cat has higher speed

Power line Around 100 Mbps - under development

Fiber Single mode Multi mode

Fiber

Network classification - size PAN LAN MAN WAN

Classification Synchronous – some form of synchronization mechanism Asyncrhonous – anything goes, in-data sync expensive (as in too many syn bits / transmission)

Classificiation Circuit switched Packet switched

Efficient use of network resources Multiplexing frames error correction / error detection flow control windowing