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1 what is a digital immune system2 how does behavior-blocking software work3 describe some worm countermeasures4 what
it was stated that the inclusion of the salt in the unix password scheme increases the difficulty of guessing by a
assuming that you have successfully answered the preceding problem and understand the significance of the salt here is
for the dac model discussed in section 43 an alternative representation of the protection state is a directed graph
unix treats file directories in the same fashion as files that is both are defined by the same type of data structure
in the traditional unix file access model unix systems provide a default setting for newly created files and
consider user accounts on a system with a web server configured to provide access to user web areas in general this
assume a system with n job positions for job position i the number of individual users in that position is ui and the
in the context of an ids we define a false positive to be an alarm generated by an ids in which the ids alerts to a
1 what are fat clients and thin clients and what are the differences in philosophy of the two approaches2 suggest pros
let alpha be the percentage of program code that can be executed simultaneously by n computers in a cluster each
an application program is executed on a 9-computer cluster a benchmark program takes time t on this cluster further 25
the following fortran program is to be executed on a computer and a parallel version is to be executed on a 32-computer
1 what is the major function of the network access layer2 what tasks are performed by the transport layer3 what is a
a the french and chinese prime ministers need to come to an agreement by telephone but neither speaks the others
a tcp segment consisting of 1500 bits of data and 160 bits of header is sent to the ip layer which appends another 160
a user on a unix host wants to transfer a 4000-byte text file to a microsoft windows host in order to do this he
the tftp specification rfc 1350 states that the transfer identifiers tids chosen for a connection should be randomly
in order to be able retransmit lost packets tftp must keep a copy of the data it sends how many packets of data must
we have seen that in order to deal with lost packets tftp implements a timeout-andretransmit scheme by setting a
tftps timeout-and-retransmission scheme implies that all data packets will eventually be received by the destination
this chapter mentions the use of frame relay as a specific protocol or system used to connect to a wide area network
1 discuss some of the reasons for implementing process migration2 how is the process address space handled during
the flushing policy is described in the subsection on process migration strategies in section 181a from the perspective
for figure 189 it is claimed that all four processes assign an ordering of a q to the two messages even though q