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Question:
(a) Draw the waveform for an asynchronous transmission with the following specifications:
Character "H", one even parity bit, one start bit, one stop bit, and a baud rate of 4800. Assuming the transmission begins at time t = 0, label the starting/ending time for each bit in the transmission.
Note: ASCII value of "H" is 72
(b) Identify the usage of each of the fields of an IEEE 802.3 data frame.
(c) (i) Give 4 main techniques that a firewall would use to filter incoming and outgoing network traffic.
(ii) Discuss both cut-through and store-N-forward switches. Explain their differences and incorporate the advantages and disadvantages of each.
(d) Explain the purpose of the ident and offset fields in an IPv4 packet header.
Question: Spreadsheet packages are widely used in Business. a) Explain why spreadsheets are so useful. b) Spreadsheet files are sometimes saved for use by other software
ADDRESS MASKS To identify receiver, network apply address mask to receiver address and calculate to network address in routing table. It can use Boolean 'and' to calculate the
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
Question 1 a) Provide three advantages of using optical fiber. b) Distinguish between "Direct Sequence Modulation" and "Frequency Hopping" c) Decribe the purpose of using "
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 tec
QUESTION : a) A datagram of 3000 bytes has to travel over a network with a MTU size of 1000 bytes. Describe how fragmentation can be used to solve this problem. You should pr
QUESTION (a) Which PKI (Public Key Infrastructure) model is typically favored by business organization? (b) Give one possible use of the "extensions" field of an X.509 certi
QUESTION: (a) For the bit stream 010011, sketch the waveforms for each of the code indicated. Assume that the signal level for a space in NRZ-L is positive; the signal level f
what is hacking
Broadcasting is the distribution of video and audio content to a whole audience via any audio or visual mass communications medium, but generally one using electromagnetic radiat
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