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Consider a computer system with three users: Alice, Bob and Cindy. Alice owns the file alicerc, and Bob and Cindy can read it. Cindy can read and write the file bobrc, which Bob owns, but Alice can only read it. Only Cindy can read and write the file cindyrc, which she owns. Assume that the owner of each of these files can execute it. a) Create the corresponding access control matrix.
b) Cindy gives Alice permission to read cindyrc, and Alice removes Bob's ability to read alicerc. Show the new access control matrix.
c) Show the access control list for the latter scenario (you do not need to draw a diagram - just list the different entries).
Question : (a) How does a 2-key rollover differ from the N-key rollover? (b) Why is isolation so important in interfacing? (c) Explain what is software debouncing.
Threat Identification After identifying and performing a primary classification of an organization’s information assets, the analysis phase moves onto an examination of threats
QUESTION a) Below is a capture of an Ethernet II frame which contains an IPv4 packet and a segment. Give the source MAC address in hexadecimal; the source IP address, the uppe
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A full-duplex (FDX) , accepts communication in both ways, and, unlike half-duplex, accept this to occur simultaneously. Land-line telephone networks are full-duplex, since they
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Discuss how developers should apply the following countermeasures to improve the security of their code:
Question: (a) Which type of attacker represents the most likely and most damaging risk to your network? (b) What is the basic reason that social engineering attacks succeed?
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