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Question:
a) Explain what the following intermediate systems are and how they work?
i. Repeater ii. Bridge
b) A service is formally specified by a set of primitives (operations) available to a user or other entity to access the service.
i. Examine the differences between connection-oriented service and connectionless-oriented service.
ii. How is a reliable service determined?
Question: (a) Give 2 benefits of using IPsec. (b) IPSec uses two protocol for security: Authentication Header protocol (AH) and the Encapsulated Security Header Protocol (
Q. What is Triple Key Management Scheme? The triple key management mechanism provides optimum security by enabling the use of two pre-deployed keys for each of the WS nodes, an
(a) Define what you understand by the following terms in Network Flows: i) UnDirected Path ii) Directed Path iii) Directed Cycle. iv) Tree In each of the above, expla
Problem (a) Using Vigenère cipher and given the key abc, find the ciphertext for the message: simplicity Only the 26 lower-case alphabetical characters are used in messa
BUS TOPOLOGY In a bus topology all devices are attached to a single long cable and any device can send data to any other device. For this function, coordination is needed to d
Maximum Transmission Unit (MTU) Each hardware method specification adds the definition of the maximum size of the frame data area, which is known the Maximum Transmission Uni
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 dist
ROUTING TABLE For efficiency, information about forwarding is saved in a routing table, which is started at system initialization and must be updated as network topology modif
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
Assume that a security model is needed for the protection of information in your class. Using the CNSS model, examine each of the cells and write a brief statement on how you would
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