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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.
what is hacking
(a) Describe RSA encryption. (b) For an RSA encryption the values of the primes are: p=29, q=31. select e=11, evaluate the public and private keys. (c) How can RSA be used fo
What is Authentication/confirmation? How it is different from the Authorization/approval? Explain in brief different authentication protocols along with their merits and demerit
- Alice, Bob and Charlie have a secret key a=3, b=4, c=5, in that order. - They would like to find a common secret key using Diffie-Hellan key exchange protocol (with g=2, p=5).
Explain the architecture of ISDN.....?
SECURING THE COMPONENTS Computer can be subject of an attack or the object of an attack. When subject of an attack, computer is used as lively tool to conduct attack. The figure
Documenting the Results of Risk Assessment The goal of this process is to recognize the information assets, list them, and rank according to those most required protection. The
The Role of the Investigation The first phase, investigation is the most significant. What problem is the system being developed to solve? During investigation phase, objectives
Question: a. State briefly three reasons why computer networks are used? b. Differentiate between simplex, half-duplex and full-duplex mode of transmission. c. State any
ADDRESS RESOLUTION PROTOCOL (ARP) TCP/IP can use any of the three address resolution functions relaying on the addressing procedure used by the underlying hardware. To guarant
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