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Problem (a) The IEEE 802 series of standards describe both the Physical and Data Link layers of their respective technologies. Two important standards are 802.3 and 802.5, respectively known as CSMA/CD (Ethernet) and Token Ring.
i. Explain how CSMA/CD operates and describe how Ethernet deals with collisions.
ii. Give the structure of a typical Token Ring frame and explain how communication is effected in a Token Ring Network.
Problem (b) A datagram of 3000 bytes has to travel over a network with a MTU size of 1000 bytes. Explain how fragmentation can be used to solve this problem.
You should give the value of the 3 key fields used in fragmentation for each fragment created.
Problem (c) Nowadays many companies are shifting towards the IEEE 802.11x standard for extending their network.
i. Outline two popular flavours of this wireless standard. Elaborate on the operating frequency, range and speed of each flavour.
ii. What are the two modes of operation of this standard and explain the difference between the two.
iii. Mention one security issue with this wireless technology and explain how this issue can be addressed.
W h a t do you understand by the terms security, network security and information security? How network security and information security are connected? Security can be def
IP DATAGRAM HEADER FORMAT: It is given in the figure below: In the table: VERS denotes the version of IP. H.LEN denotes the header length in units of
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?
Question 1 a) Explain how CSMA/CD works. b) Describe the term "exponential back-off". c) Describe the differences between "circuit switching" and "packet switching". d) Th
Assume that the RSA problem is hard, prove that the RSA encryption is secure against IND- CPA. Provide a game between an adversary A and a simulator (or challenger) B.
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Question requires you to develop firewall rules based on a fictitious organisation. Scenario: You work for a security-conscious company, xC-Cure, who develop encryption te
What is the use of it
Problem 1 . Show various features of a 1G network Total three features for each feature of 1G Problem 2. Describe how a cellular network works with functional block diagram
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