quiz1 notes

quiz1 notes - Lecture 1 - 2 - Packet switching - Data...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 1 - 2 - Packet switching - Data transmitted in small, independent pieces. Each packet travels independently - Functions of networks : Packet construction (encode/package data at source), Packet transmission, Packet interpretation (unpack/decode data from packet at destination) - Other functions : Route discovery, Traffic/congestion control, Retransmitting lost packets, Determining type of data - Network: system for connecting computers using a single transmission technology - Internet: a large connection of network - Probing the internet – Ping, traceroute - RFC – Request for comment -Levels of abstraction : - Network application programs: Use networking functions, Issue "high-level" calls - Network functions and protocols: Implement networking functions, Issue "system-level" calls to - Network operating systems and hardware devices: Control actual data transmission Lecture 3 - Transmitting data : Encode data as energy and transmit the energy, Decode the energy at destination back into data, Energy can be electrical, light, radio, sound - Transmission media : Transmitted energy is carried through some sort of medium, Transmitter encodes data as energy and transmits energy through medium, Receiver captures signals (energy) and decodes energy to data - Medium can be : copper (Most commonly used medium, Inexpensive, can cause noise, Shield twisted pair STP or UTP) , glass fiber (Thin glass fiber carries light with encoded data ), radio frequency, waves – commonly used : fiber-optic cable, copper cable, radio wave - Half-duplex transmission : Data can flow in only one direction at a given time - Full-duplex transmission : Two endpoints may send data simultaneously - Asynchronous communication : transmitter and receiver do not explicitly coordinate each data transmission - Bitwise transmissions : change voltages to represent 1s and 0s (neg voltage = 1, pos voltage = 0 ) - Baud rate measures number of possible signal changes per second Nyquist's Theorem – calculating bandwidth D = 2B log K B = bandwidth (Hz), K = voltage value, D = rate (bps) Shannon's Theorem – calculate signal to noise ratio C = B log (1 + S/N)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/15/2008 for the course CS 372 taught by Professor Leviet during the Summer '07 term at Oregon State.

Page1 / 2

quiz1 notes - Lecture 1 - 2 - Packet switching - Data...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online