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Question
(a) Name 3 popular electronic mail access protocols?
(b)
i. What is DNS?
ii. Briefly, describe what it does and how it works?
iii. Why does DNS use a distributed approach as opposed to a single server?
(c) HTTP supports both non-persistent and persistent connections.
i. Describe each type of connection and state which HTTP protocol version supports each type?
ii. How and where is the type of connection specified in the HTTP protocol?
(d) Assume that a new application layer protocol is developed for video conferencing application. Which transport layer protocol do you think will be used and why?
(e) FTP is said to have an "out-of-band" connection. Explain what it means?
Question: (a) Distinguish between Steganograhy and Cryptography. (b) "Playfair cipher is more secure than Monoalphabetic cipher." Justify this statement. (c) Various ap
Please see attached file
Question: (a) Data on four variables are stored in a file called file1.dat. The first line of the file is the variable names f, x, y and z. Give the R commands to (i) read t
Mapping between a hardware address and a protocol address is known Address Resolution. A router or host uses address resolution when it requires to transmit a packet to another dev
Problem a) Give the destination IP address, upper layer protocol, TTL in decimal and header checksum in hexadecimal; the source port number and the destination port number in deci
Question: (a) Your office administrator is being trained to take server backups. Which authorization model could be ideal for this situation: MAC, DAC or RBAC? Justify your a
Q. Attacks on wireless network WSN are vulnerable to attacks which compromise the integrity of the WSN nodes by decreasing the nodes' fault tolerance capabilities, data distrib
Public Key Infrastructure (PKI) It is integrated system of software, encryption methodologies, protocols, legal agreements, and 3rd-party services enabling users to communicate
(a) (i) If m = p·q·r where p, q, and r are prime numbers, what is Φ(m)? (ii) Therefore, Determine Φ(440). (b) Describe the following terms as used in cryptography: (i)
Describe what the FTAM services are. FTAM stand for the File Transfer Access and Management: FTAM is an ISO application protocol which performs the operations on files such as.
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