If the error rate on the network is
low, the occasional bad packet will hardly be noticed, except for the infrequent audio or video
???glitch.???
7.5 IPv6 uses addresses that are 16 bytes long (128 bits). How many addresses is that per person in the
world?
The population of the world in 2007 is about 6.6 billion; 128 bits can represent numbers up to
3.4 * 1038. With addresses occupying 128 bits, we have approximately 5 * 1028 addresses per person!
7.6 What classes does Java provide to make network programming easier? Which classes are for TCP
communications? Which classes are for UDP communications?
For TCP: ServerSocket, Socket
For UDP: DatagramSocket, DatagramPacket
7.7 It??™s hard to imagine today how hot the competition was between different vendors of proposed
networking standards in the 1980s. Today most wired LANs are implemented using 802.3 ???Ethernet???
protocols. General Motors strongly backed a competitive standard called manufacturing automation
protocol (MAP) that became IEEE standard 802.4. Do some research to answer these questions: Why
did GM favor 802.4 over 802.3? Why did most of the world end up choosing 802.3?
ANSWERS TO REVIEW QUESTIONS 205
206 ANSWERS TO REVIEW QUESTIONS
GM was concerned with the predictability of response on the network.
Pages:
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532