chapter 1 computer networks
TRANSCRIPT
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fibre = fiberrouteing = routingroute = routerouter = router
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Network protocols: same idea, but machines
instead of humans All communication activity in
the Internet is governed byprotocols
Protocols define the format,order of messages sent and
received among networkentities, and the actions
taken upon messagetransmission and receipt
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Human protocol Network protocol
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Tier-2 ISP paystier-1 ISP forconnectivity torest of Internet
tier-2 ISP iscustomerof tier-1provider
Tier-2 ISPs also peer privately with
each other, interconnect at NAP
Tier 1 ISP
Tier 1 ISP
Tier 1 ISP
NAP
Tier-2 ISPTier-2 ISP
Tier-2 ISP Tier-2 ISP
Tier-2 ISP
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Tier 1 ISP
Tier 1 ISP
Tier 1 ISP
NAP
Tier-2 ISPTier-2 ISP
Tier-2 ISP Tier-2 ISP
Tier-2 ISP
local
ISPlocal
ISP
local
ISP
local
ISP
local
ISP Tier 3
ISP
local
ISP
local
ISP
local
ISP
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100 km 100 kmtoll
boothtoll
booth
10-car caravan
time to push entire caravan through toll booth onto highway
= 12*10 = 120 sec time for last car to propagate from 1st to 2nd toll booth = 100km/(100km/hr) = 1 hr
A: 62 minutes
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100 km 100 kmtoll
boothtoll
booth
10-car caravan
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dnodal =dproc +dqueue +dtrans +dprop
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ticket (purchase) ticket (complain)
baggage (check) baggage (claim)
gates (load) gates (unload)
runway(landing)runway(takeoff)
airplane routing airplane routing airplane routing
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departur#airpor!
intermediate air-trafficcontrol centres
arrivalairpor!
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application
transportnetwork
link
physical
application
transportnetwork
link
physical
link
physical
network
linkphysical
messag#
segmen!datagra
"am#
switch
router