7/29/2019 Chapter 1 computer networks

1/54

7/29/2019 Chapter 1 computer networks

2/54

7/29/2019 Chapter 1 computer networks

3/54

7/29/2019 Chapter 1 computer networks

4/54

7/29/2019 Chapter 1 computer networks

5/54

7/29/2019 Chapter 1 computer networks

6/54

7/29/2019 Chapter 1 computer networks

7/54

7/29/2019 Chapter 1 computer networks

8/54

7/29/2019 Chapter 1 computer networks

9/54

fibre = fiberrouteing = routingroute = routerouter = router

7/29/2019 Chapter 1 computer networks

10/54

7/29/2019 Chapter 1 computer networks

11/54

7/29/2019 Chapter 1 computer networks

12/54

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

7/29/2019 Chapter 1 computer networks

13/54

Human protocol Network protocol

7/29/2019 Chapter 1 computer networks

14/54

7/29/2019 Chapter 1 computer networks

15/54

7/29/2019 Chapter 1 computer networks

16/54

7/29/2019 Chapter 1 computer networks

17/54

7/29/2019 Chapter 1 computer networks

18/54

7/29/2019 Chapter 1 computer networks

19/54

7/29/2019 Chapter 1 computer networks

20/54

7/29/2019 Chapter 1 computer networks

21/54

7/29/2019 Chapter 1 computer networks

22/54

7/29/2019 Chapter 1 computer networks

23/54

7/29/2019 Chapter 1 computer networks

24/54

7/29/2019 Chapter 1 computer networks

25/54

7/29/2019 Chapter 1 computer networks

26/54

7/29/2019 Chapter 1 computer networks

27/54

7/29/2019 Chapter 1 computer networks

28/54

7/29/2019 Chapter 1 computer networks

29/54

7/29/2019 Chapter 1 computer networks

30/54

7/29/2019 Chapter 1 computer networks

31/54

7/29/2019 Chapter 1 computer networks

32/54

7/29/2019 Chapter 1 computer networks

33/54

7/29/2019 Chapter 1 computer networks

34/54

7/29/2019 Chapter 1 computer networks

35/54

7/29/2019 Chapter 1 computer networks

36/54

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

7/29/2019 Chapter 1 computer networks

37/54

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

7/29/2019 Chapter 1 computer networks

38/54

7/29/2019 Chapter 1 computer networks

39/54

7/29/2019 Chapter 1 computer networks

40/54

7/29/2019 Chapter 1 computer networks

41/54

7/29/2019 Chapter 1 computer networks

42/54

7/29/2019 Chapter 1 computer networks

43/54

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

7/29/2019 Chapter 1 computer networks

44/54

100 km 100 kmtoll

boothtoll

booth

10-car caravan

7/29/2019 Chapter 1 computer networks

45/54

dnodal =dproc +dqueue +dtrans +dprop

7/29/2019 Chapter 1 computer networks

46/54

7/29/2019 Chapter 1 computer networks

47/54

7/29/2019 Chapter 1 computer networks

48/54

7/29/2019 Chapter 1 computer networks

49/54

ticket (purchase) ticket (complain)

baggage (check) baggage (claim)

gates (load) gates (unload)

runway(landing)runway(takeoff)

airplane routing airplane routing airplane routing

7/29/2019 Chapter 1 computer networks

50/54

departur#airpor!

intermediate air-trafficcontrol centres

arrivalairpor!

7/29/2019 Chapter 1 computer networks

51/54

7/29/2019 Chapter 1 computer networks

52/54

7/29/2019 Chapter 1 computer networks

53/54

7/29/2019 Chapter 1 computer networks

54/54

application

transportnetwork

link

physical

application

transportnetwork

link

physical

link

physical

network

linkphysical

messag#

segmen!datagra

"am#

switch

router