Questions from Operating Systems


Q: The previous version of the TFTP specification, RFC 783, included

The previous version of the TFTP specification, RFC 783, included the following statement: All packets other than those used for termination are acknowledged individually unless a timeout occurs. The...

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Q: What is the limiting factor in the time required to transfer a

What is the limiting factor in the time required to transfer a file using TFTP?

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Q: A user on a UNIX host wants to transfer a 4,

A user on a UNIX host wants to transfer a 4,000-byte text file to a Microsoft Windows host. In order to do this, he transfers the file by means of TFTP, using the netascii transfer mode. Even though t...

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Q: The flushing policy is described in the subsection on process migration strategies

The flushing policy is described in the subsection on process migration strategies in Section 19.1. a. From the perspective of the source, which other strategy does flushing resemble? b. From the pers...

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Q: TFTP, like most protocols, will never send an error packet

TFTP, like most protocols, will never send an error packet in response to an error packet it receives. Why?

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Q: What is the difference between a multiprocessor and a multicore system?

What is the difference between a multiprocessor and a multicore system?

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Q: We have seen that in order to deal with lost packets,

We have seen that in order to deal with lost packets, TFTP implements a time-out-and-retransmit scheme, by setting a retransmission timer when it transmits a packet to the remote host. Most TFTP imple...

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Q: TFTP’s time-out-and-retransmission scheme implies that all

TFTP’s time-out-and-retransmission scheme implies that all data packets will eventually be received by the destination host. Will these data also be received uncorrupted? Why or why not?

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Q: What are the advantages and disadvantages of using a file integrity checking

What are the advantages and disadvantages of using a file integrity checking tool (e.g., tripwire). This is a program which notifies the administrator of any changes to files on a regular basis? Consi...

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Q: Some have argued that Unix/Linux systems reuse a small number

Some have argued that Unix/Linux systems reuse a small number of security features in many contexts across the system; while Windows systems provide a much larger number of more specifically targeted...

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