social web media course introduction and technical/conceptual foundations lecture based on:...
TRANSCRIPT
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SOCIAL WEB MEDIA
Course Introduction and
Technical/Conceptual Foundations
lecture based on:
Navigating the Internet - Smith, Gibbs, McFedriesPocket Guides to the Internet – Veljkov
Protocol (ch 1) – GallowayWikipedia entries
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BASIC TERMS
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BASIC TERMS
INTERNETWORLD WIDE WEB
PROTOCOLTCP/IP
IP ADDRESSDNS
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INTERNET
or
WEB?
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The Internet is a worldwide, publicly accessible series of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP) (Wikipedia)
“A worldwide network of networks” (Veljkov p1)
The World Wide Web (WWW)...a system of interlinked hypertext documents accessed via the Internet. (Wikipedia)
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Email ?
instant messaging ? (IRC, Jabber, etc)
Facebook chat ?
Usenet ?
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PROTOCOL
general definition
“agreed-upon methods of communication used by
computers and, for that matter,
by people.” (Smith p6)
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CULTURAL PROTOCOLS
telephone call protocol
bank line protocol
grocery store line protocol
classroom protocol
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In a formal meeting...
“someone chairs the meeting, states its objectives... invites people to speak. When each person finishes speaking, control returns to the chair.”
ways for handlinginterjections error conditions
(Smith p6)
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for networked computers...
which computer begins communication
how replies are handled
how will data be represented
how will errors be handled
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TCP/IP
two protocols...
Transmission Control Protocol
Internet Protocol
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protocol suites or protocol stacks
lowest level to highest level
lowest level: basic functions... receiving pulses of electricity from the
communications medium
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Application layer
Transport layer
Internet layer
Link layer
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Application layer(content)
Transport layer (makes sure data arrives correctly – a social layer)
Internet layer (actual movement of data from one place to another)
Link layer (hardware-specific)
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Application layer(content)
Telnet, FTP, HTTP
Transport layer (makes sure data arrives correctly – a social layer)
TCP, UDP
Internet layer (actual movement of data from one place to another)
IP & ICMP
Link layer (hardware-specific)
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Compare to telephone call “protocols”
conversation – (application layer)“Are you still there?” - (transport layer)
“Can you repeat that?” - (transport layer)“Hi, this is...” “OK – Bye!” (transport layer - establishing
and closing the connection)phone switching/routing (analogous to Internet layer)physical phone or fiber optic lines (link layer/hardware
layer)
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Internet Protocol
Developed to enable different local area networks to communicate with each other
Has become the basis for connecting computers around the world together over the Internet
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TCP/IPIP = breaking up data and sending itTCP = make sure data arrives intact
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error correction is the responsibility of TCP
routing is the responsibility of IP
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Data Transmission consists of sending/receiving streams of zeros and ones along the network connection
Two Types of Information: Application data
The information one computer attempts to send to another Network protocol data
Describes how to reach the intended computer Describes how to check for errors in the transmission
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Data must be marked with a destination address
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IP ADDRESS
In IP the destination address is 4 bytes
(each byte is a number 0-255)
example:
64.233.167.104
http://64.233.167.104/
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To be able to accommodate more devices, IP addresses will be extended to sixteen bytes
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DNSDomain Name System
resolves names “www.rhizome.org”
into IP addresses
206.252.131.211
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When a computer wants to request data from a domain name: It asks the DNS for the numeric Internet Address It includes the numeric address with the request for data
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Domain Name Servers
distributed
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Domain Name System
inverted tree structure
decentralized hierarchy
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. (root)_____________|__________| | | |.org .com .net .edu
| |google buffalo
| | | images www mediastudy
to resolve the numerical address for mediastudy.buffalo.edu first a request goes to a root nameserver to find out where the appropriate top level domain server (.edu) is, then that server is queried as to where the host (buffalo) is, then the host is queried for the address of the actual computer in question (mediastudy)
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Each server only has info aboutthe area directly below it in the
hierarchy.
Decentralized network model.
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Protocols
TCP/IPpeer-to-peer
non-hierarchicaldistributed
DNShierarchical
decentralized
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FLOW
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IP breaks large chunks of data up into more manageable packets
Each packet is delivered separately
Each packet in a larger transmission may be sent by a different route
Packets are numbered
The recipient reassembles the data
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Internet Protocol (IP) does not notify the sender if data is lost or garbled
This is the job of a higher level protocol Transmission Control Protocol (TCP)
The most commonly used Internet services use TCP with IP (TCP/IP)
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Attempt to deliver the data
Try again if there are failures
Notify the sender whether or not the attempt was successful
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PART 2:
“The emergence of distributed networks is part of a larger shift in social life. [...] a
movement away from central bureaucracies and vertical hierarchies toward a broad network of autonomous social actors.”
- Galloway
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PART 2:
“The emergence of distributed networks is part of a larger shift in social life. [...] a
movement away from central bureaucracies and vertical hierarchies toward a broad network of autonomous social actors.”
- Galloway
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PART 2:
NETWORK TOPOLOGIES
CENTRALIZED
DECENTRALIZED
DISTRIBUTED
HUBS
NODES
HIERARCHIES
RHIZOME
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[[clip: Apple Macintosh 1984 ad]]
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changes in workplace
teams/outsourcing/consulting etc.
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Protocol“a set of guidelines or rules” (Wikipedia)
Uses of term protocol:
militarychain of command, hierarchy
Internetflexible, distributed, resistive of hierarchy
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Network Topologies
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Network modelsCentralizedDecentralizedDistributed
discuss in terms of hubs and nodes...
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Image: Rand Corporation
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Cold War origins of Internet*
(*specifics are open to debate)
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two images:
nuclear attack
Internet
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Two images:
nuclear attack“highly energetic, dominating, centralized”
Internet“non-centralized, non-dominating, non-
hostile”
(Galloway)
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Image: Rand Corporation
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centralized networks:hierarchical
a single authoritative hub“top-down management”
US judicial systemBentham's Panopticon (as
discussed by Foucault)
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decentralized networks:network diagram of the modern eramultiple hubs w/ dependent nodes
airline system (airline hubs)university departments
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distributed networks:no central hubsno radial nodes
each entity is autonomousInternet
freeway system
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Many paths to a destination
freeway systemif 90 is closed use another route
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“The emergence of distributed networks is part of a larger shift in social life. [...] a
movement away from central bureaucracies and vertical hierarchies toward a broad network of autonomous social actors.”
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“The emergence of distributed networks is part of a larger shift in social life. [...] a
movement away from central bureaucracies and vertical hierarchies toward a broad network of autonomous social actors.”
- Galloway
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Gilles Deleuze and Felix Guattari
metaphors:
arborescenttree-like structure
directional
rhizomaticroot network (ginger)
multiple, non-hierarchical
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image: Wikipedia
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“What was once protocol's primary liability in its former military context – the autonomous agent who does not listen to the chain of
command – is now its primary constituent in the civil context.”(Galloway p38)
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Classical era sovereign central control
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Classical era sovereign central control
Modern era bureaucracy decentralized control
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Classical era sovereign central control
Modern era bureaucracy decentralized control
Now ???
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How it works...
materiality of the Internet
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host computers
clients (receiver of information)servers (sender of information)
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Network conditions are always changing...
traffic bandwidth hosts going offline
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Packets “hop” from host to host.
Each host only knows what general direction
the packet is headed.
Each host knows which of its neighboring hosts
lie in which direction.
If transmission to a neighbor fails, the host updates its information.
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Each packet is given a “time-to-live” number.
Each hop subtracts from the “time-to-live.”
If the packet reaches 0 it is deleted.
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Each packet has a header.
source addressdestination address
checksum
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Protocological characteristics of TCP/IP
facilitates peer-to-peer communicationdistributed technology (meshwork/rhizome)
universal language (any 2 computers that speak TCP/IP can network)
robust and flexible/ not rigid and toughopen to theoretically unlimited variety of computers
is a result of the action of autonomous agents (computers)