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QUESTION:
(a) Ethernet has grown in popularity in the recent years and is now used in LANs. Give three reasons for the success behind Ethernet.
(b) Ethernet uses the CSMA/CD multiple access protocol. Describe the features behind CSMA/CD.
(c) A bridge is a link layer device that stores and forwards Ethernet frames. One of its characteristics is that a bridge is self-learning. Bridges also do not offer protection against broadcast storms.
(i) Show, by means of a diagram, how a bridge learns.
(ii) Explain what is a broadcast storm is and how it can take place.
(d) Briefly describe the difference between store-and-forward and cut-through switches. Also, store-and-forward switches have an advantage over cut-through switches with respect to damaged frames. Explain what it is.
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(a) Using the extended Euclidean algorithm, find the multiplicative inverse of 504 mod 67. (b) Decrypt the following ciphertext, which has been encrypted using Caesar cipher:
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Encryption Key Size When using ciphers, the size of crypto variable or key is quite important as the strength of many encryption applications and cryptosystems were measured by
code and logic
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