ppt - Department of Information Technology

deadpannectarineΔίκτυα και Επικοινωνίες

26 Οκτ 2013 (πριν από 3 χρόνια και 5 μήνες)

65 εμφανίσεις

The switching 60’s

Telephone


Telephone network is the dominating communication
network


Used circuit switching

Computer
communication


Short

bursts

of information


Long
inactivity

periods


Packet
switching


More

suitable

for this
type

of
communication


More

robust

ARPAnet


Advanced

Research Projects Agency at MIT


The first packet
switching

network


IMP (Interface
message

processor)
installed

at


UCLA


UC Santa Barbara


Stanford


Univ.
o
f Utah



The 70’s


1972:


ARPAnet

is
now

consistent

of 15
nodes


The first
host
-
to
-
host

protocol


NCP (Network Control
Protocol
)
enables

applications

to be
written


First
e
-
mail

program


New
networks

emerging



ALOHAnet


Enabling communication over microwaves between the Hawaiian Islands.


Telenet


Commercial packet switching network based on
ARPAnet’s

technology


Cyclades


French packet switching network


IBM’s SNA


Parallelled

ARPAnet’s

work


Tymnet
, GE Information Services network etc.


Time sharing networks

Networks of
networks


DARPA (
Defence

ARPA)
funded

the
connection

of
networks


Networks of
networks

also

called

inernetting


Protocols

TCP

TCP

IP


(
early

version of) TCP
was

used

for
connecting

the
networks


Forwarding

functions



IP


UDP

More

Protocols



Ethernet
protocol


Enabling

wired

based

broadcast

sharing

networks


Laying

the
foundation

for
LAN



ALOHA
Protocol


Multiple access
protocol

The 80’s

More

computer
networks


BITNET


University
e
-
mail

and
file

sharing


CSNET


Linking

researchers
without

access to the
ARPAnet


NSFNET


Connection to
supercomputing

centers


56kbps
backbone
, later 1,5Mbps and
serving

as the
linking

backbone

between

regional
networks


Standardisation


TCP/IP
replacing

NCP as the standard
host

protocol

for
ARPAnet


The late 80’s:


Congestion

control

is
added

to TCP


DNS is
invented

The 90’s

Commercialisation


ARPAnet

closes

down


NSFNET
serving

as
backbone

connecting

the regional
networks

and
opening

the
network

for
commercial

purposes


In 1995 NSFNET is
decomissioned

and Internet
Service
Providers

serves as the new
backbones

in
its

place

Developments


The key
components

of the
web
: HTML, HTTP,
web

server and a
web

browser

is
developed

in the
early

90’s


93:
web

browsers

with GUI.


95: Web
commerce


Killer

applications
:


E
-
mail


The Web


IM (ICQ)


P2P
file

sharing

(
Napster
)

The rest is history…