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Introduction to Computer Networks

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Presentation on theme: "Introduction to Computer Networks"— Presentation transcript:

1 Introduction to Computer Networks

2 mobile network global ISP regional ISP home network institutional

3 to/from headend or central office
Access net: home network wireless devices to/from headend or central office often combined in single box wireless access point (54 Mbps) router, firewall, NAT cable or DSL modem wired Ethernet (100 Mbps) Introduction

4 Circuit switching: FDM versus TDM
4 users Example: FDM frequency time TDM frequency time

5 Packet Switching: queueing delay, loss
R = 100 Mb/s D R = 1.5 Mb/s B E queue of packets waiting for output link

6 Internet structure: network of networks
access net … ISP A IXP Content provider network IXP ISP B ISP B regional net

7 Proxy server Firewall Firewall mobile network global ISP home network
regional ISP home network institutional Proxy server Firewall Firewall

8 Organization of air travel
ticket (purchase) baggage (check) gates (load) runway takeoff airplane routing ticket (complain) baggage (claim) gates (unload) runway landing

9 Layering of airline functionality
ticket (purchase) baggage (check) gates (load) runway (takeoff) airplane routing departure airport arrival intermediate air-traffic control centers ticket (complain) baggage (claim gates (unload) runway (land) ticket baggage gate takeoff/landing

10 Encapsulation source destination application transport network link
message M application transport network link physical segment Ht M Ht datagram Ht Hn M Hn frame Ht Hn Hl M link physical switch destination network link physical Ht Hn M Ht Hn Hl M M application transport network link physical Ht Hn M Ht M Ht Hn M router Ht Hn Hl M Introduction

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