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Often
to
Lothanges
F
top
Typ
us
airless
exige eggs
were
connection
Nuts
8
Bolts
view
components
of
internet
the things
we are
using
as
users are computing
devices
PC
server
wireless laptop
smart
phones et
they
are
called
hosts
or
end
systems
cuz
they're at
the
very
end
ofthe
internet
wtv
end
system ur
using
ur
connected to internet somehow
using
comunication
links
cellular tower wifiAP
istitutional switch wireless network
etc
ifit's
wireless radio link
wireless and
thru
satellite satellite link from home fibre linkthru
ethernet
copper
li
all of
these links
are
different
have
different transmission
rates
also
called bandwidth
transmission
ratethe
number
of
bits
they
can transmit
per
second
bps
routers run allthetimepassing
data
in
really
high
speed forwarding
packets
chunks
of
data
rules
that
control sending and relieving
data
msg
protocols
ex
TCP
HTTP
over
web
etc
internet a
network of
networks
services
view
Communication Infrastructure
the
roads highways thatallowdatato travelfrom one place to
another
they
provideservices
to
applications like web streaming video email social media etc
they
provide programing
interfaces built
in
internet tools called hooks
that
apps
can use
to
send
and
recieve
information
data
special permission to
connect
to
eachother over the internet
provides
service options
standard
expressetc
different
ways
for
apps
to send relieve data depending
on
what
they
need speedreliability
etc
Protocol
protocols
formal
way
of
calling a
set
of
rules it's a
standard
way
of parties
comunicating with
eachother
internet
protocol one end system asking another
end
system for
information
data
ex
using
web
browser
tryna get
contentfrom a
URL
browser sends a
connection request
msg
to
the webserver that
holds
the
content
and
theserverwill
say
sure u
got
my
attention
watdou
need client
says
i
need
this
page
server
thensends
the
content client
clients device or
app
thatrequest
data
ex
Chrome
Safari
server
p.PEtnyYjeuESthafiionnEies
to
the
internet ex laptops
they
send
recieve data
all
communication
activity in
internet are governed
by
protocols they
define format orderafter
Ekg
etc
Internet
structure
Network edge
hosts client and
servers
end
systemswhere we run applications
connect
to
internet
thru
Access networks communication links can be
wired
wireless thru difkinds
ofphysical
media technologies
Network core are essentially
interconnected routers
all
together they're network of
networks
radio
links
used
by
all
wireless network access technologies ex
Wireless
LAN
wifi
Wide area 46
cellular
Bluetooth Satellite
TheNetwork core
network core is a mesh
of
interconnected routers that
their
role
is
just
to
transfer data
how
is
data
transferred through
net
withtwo main
mechanisms
packet
switching
uses entire link capacity sending data
using
one packet
chunk at a time
circuitswitching a
dedicated
circuit
that's reserved thru
the
entiretime
of
communication same
mech used
by
tele
Packet
Switching
packet
switching
divides data intopackets
as longasthelinkis
available
pass
itout
infull
bandwidth
packet
transmission delay
takes
YR
seconds
L size of packet
Mbits
R
Link
bandwidth
rate
M bps
max
rate
at
whichdata
can
be
transmitted
onthelink
no Idle waste
mechanism
is
simple
no
reservation process required
very
efficent
esp
forshortdatastra
store and
forward the entire packet
must
arrive at
routterTEF
itcan be
transmitted
to
thenext
link
queueing
packets have
to
queue up
when
work
arrievesfaster that
it
canbe
served
they
waitfor link use
that
happens
when
thebits
arrival rate
bps
is
faster thanthe
transmission rate
bps ofthelink
packets
will
jukei
andwait
to
be
transmitted on the
outputlink
if the
router
gets
full packets
will
be
dropped
lost
