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TCP/IP

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by

Tim Brenner

on 12 August 2013

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Transcript of TCP/IP

Understanding TCP/IP
1974
U.S. Department of Defense ARPANET
Request for Comments(RFC)
Internet Society

Increase reliability
Detects lost, duplicated, or out of order packets
Application
Transport
Internet
Network Access/Data link
Physical
Unreliable
Emphasizes Speed
Drops packets to maintain speed

Introduction to TCP/IP
Protocol Layers
User Datagram Protocol
Introduction to
TCP/IP

User Datagram Protocol
(UDP)
IPV4 vs IPV6
Examples
VoIP
Online gaming
Streaming media
DNS
Protocol Layers
IPv4 vs IPv6
Open Systems Interconnection
(OSI)

Open Systems Interconnection
Congestion and Flow Control
Congestion and Flow Control
Connection Establishment

Transmission Policy
Examples
WWW
email
remote administration
file transfer
Secure Shell
P2P

Increases latency
Full Duplex
Cannot broadcast
Four algorithms
Slow-start
congestion avoidance
fast retransmit
fast recovery


Abstraction
layers
Segment Header Structure
IP
TCP

Two windows
receiver window
congestion window
Line noise
Fiber trunks
Wireless networks
Network capacity
Receiver capacity
Dynamically adjusts window size

Three-way handshake
Side 1 LISTEN (primitive)
Side 2 CONNECT (primitive)
IP address, port, TCP segment size, data
TCP on side 1 checks for LISTEN on specified port
If no then replies Reset (RST)
If yes then replies Acknowledgement (ACK)

Error Detection

Segmentation
Maximum segment size (MSS)
Typically set by data link layer
can be adjusted dynamically
Segmentation

(cc) image by nuonsolarteam on Flickr

Error Detection and recovery
16 bit checksum
requests retransmission
Minimum MSS
IPv4: 536 (576-20-20)
IPv6: 1220 (1280-40-20)
Headers + MSS =
Maximum transmission unit
(MTU)

Transmission Policy
Flow
Congestion
Full transcript