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unmodified page to disk before remapping the frame for other use, because an unmodified page is always available in its original form on the disk already. Often page replacement algorithms take this difference into account in order to speed execution. Other things being equal, the system will remap an unmodified page before it will remap a page that has been modified. 6.15 Why would fixed-length record files be a good choice for storing data from database tables With fixed-length record files, the system can easily calculate the exact address within the file of any record in the file. Databases often use fixed-length record files to speed indexed access to information in its tables. 6.16 How would you expect process scheduling policies to be different on batch computing systems and interactive systems Interactive computer systems like Unix and Windows use scheduling policies that share the computer in some fair way among the concurrent users. This means some variation of round robin or time-slice scheduling, perhaps mixed with additional policies for background, non-interactive processing. Batch computer systems will use scheduling policies that in some way maximize the number of jobs accomplished per hour or day. There is no moment-to-moment concern with fairness, but there is still pressure to be as efficient as possible. Perhaps a FCFS or SRJF policy will be used, or a policy that queues waiting jobs by priority. 6.17 How would you measure the success of a batch operating system Would you measure the success of an interactive system like Unix or Windows the same way If not, how would you measure the success of an interactive operating system Batch operating systems are often measured by the average number of jobs they complete per hour, or by average CPU utilization. Interactive operating systems are evaluated differently. Often the measure of success for interactive operating systems is response time; when a user enters a command, how much time elapses before the user receives the first response from the system
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NETWORKING 7.1 Explain how an IP packet might become duplicated and arrive twice at its destination. Suppose a TCP message is sent from Host A to distant Host Z. Because of network congestion, Host A does not get a confirmation from Host Z within its timeout period for the message confirmation. Therefore, Host A assumes the message was lost, and it sends the message again. Perhaps all of the IP packets will eventually arrive at Host Z, and that will mean that many or all packets are duplicated at Host Z. It s also possible that an error in a router s routing table could result in a packet being sent twice by different paths to the distant host. 7.2 Some researchers in networking complain that networking protocols have become ossified. What do they mean by that, and why might that be so Who benefits from ossified protocols As the Internet and its protocols have become central to many business applications, the consequences of any change to the protocols have become much more serious. When only a hundred academics used the Internet regularly, there was more opportunity to try new protocols and approaches. Now with millions of people, thousands of businesses, and billions of dollars dependent on current protocol definitions, it is almost unthinkable to disturb the protocol infrastructure. Our ossified protocols support the business, shopping and communications of end users of the Internet. 7.3 Using Google or some other source, find a list of other well known ports in networking besides port 80. See http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers 7.4 Most Internet communications use the TCP protocol, but some do not. Some communications use only the IP protocol. Another name for the IP protocol is user datagram protocol (UDP). Why would an application choose to use UDP Can you think of a category of applications that might prefer UDP UDP is a low-overhead, high-speed protocol. By doing away with checks for out-of-order, duplicated, or lost packets, UDP offers higher performance. Many networks have extremely low error rates anyway, so the cost of reduced reliability may be small, and the gain in speed substantial. Audio and video streams may well be communicated via UDP. 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
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