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(a) Describe how CSMA/CD operates and explain how Ethernet deals with collisions.
(b) Describe how the subsequent protocols work:
i. ARPii. DHCPiii. DNSiv. SMTP
(c) The IEEE 802.11x standard is popular in extending wired networks.
i. Outline popular flavours of this wireless standard. Illustrate on the operating frequency, range and speed of each flavour.
ii. What are the modes of operation of this standard and describe the difference between them.
iii. Mention one security issue with this wireless technology and illustrate how this issue can be addressed.
(d) Given the provided received codeword C and the generator polynomial G.
Evaluate if an error has taken place during transmission.
C: 110110011
G: x3 + x
(a) Briefly explain the following security goals provided by cryptography: confidentiality, authentication, integrity and non-repudiation. (b) State Kerckhoff's Princip
Question 1 The speech act theory is used as the model for communication among computational agents. Locution, illocution, and perlocution are the 3 aspects of this theory Using
Internet Protocol IP Gives computer-to-computer communication. Host and receiver addresses are computers. This is also known machine-to-machine communication.
what is guided media or unguided media
Why an organization need the issue specific security policy
QUESTION (a) What do you understand by a VLAN? Provide one advantage of using a VLAN. (b) What is a trunk port in a VLAN? (c) A VLAN will be created using one or more
USING ICMP TO TEST REACHABILITY: ICMP can also be used to test several tools. An Internet host A, is reachable from another host B, if data packets can be send from A to B. P
An overall rise in mobility, coupled with the falling cost of Wi-Fi equipment, has led to a proliferation of Wi-Fi hot spots in public areas to provide Internet accessibility. Thus
Base lining • Organizations do not have any contact to each other • No two organizations are identical to each other • The best practices are a moving target • K
types of firewall and backup
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