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Problem
(a) Name the various layers of the OSI model.
(b) Show, by means of a diagram, how the TCP/IP reference model is different from the OSI-7 reference model? Why is the TCP/IP model widely used?
(c) Two popular Mail Access Protocols used nowadays are POP3 and IMAP.
(i) What is the function of a Mail Access Protocol?
(ii) Describe briefly the two download modes of POP3.
(iii) From an ISP's point of view, POP3 and IMAP differ in an important way. Imagine that you were called in to advise an ISP on which protocol it should support. What considerations would you bring up?
LOG FILE MONITORS Log file monitor (LFM) is similar to NIDS. It reviews log files generated by servers, network devices, and even other IDSs for patterns and signatures. Pattern
Digital Signatures Digital Signatures are encrypted messages which can be proven mathematically to be authentic. These are created in response to rising requirement to verify in
In broadcast topology there are further two types 1) SATELLITE\RADIO 2) RING TOPOLOGY In a radio or satellite topology every computers are connected to each other via radio o
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Network diagram for a mediacal care
LOCAL TALK Apple discovered the LAN technology that uses bus topology. Its interface is added with all Macintosh computers. It has very low speed i.e. 230.4Kbps. Also it is ch
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INTRODUCTION TO CRYPTOGRAPHY Cryptography The word cryptography is derived from Greek words kryptos, which means hidden and graphein, meaning to write, this is the process of
SECURITY ANALYSIS Overview • Know yourself: examine, identify, and understand the information and systems which are currently in place • Know the enemy: examine, identify,
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