Introduction to Computer Networks

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Presentation transcript:

Introduction to Computer Networks

mobile network global ISP regional ISP home network institutional

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

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

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

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

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

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

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

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