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Q1) For the ECB, CBC, and CFB modes, the plaintext must be a sequence of one or more complete data blocks (or, for CFB mode, data segments). In other words, for these three modes, the total number of bits in the plaintext must be a positive multiple of the block (or segment) size. One common method of padding, if needed, consists of a 1 bit followed by as few zero bits, possibly none, as are necessary to complete the final block. It is considered good practice for the sender to pad every message, including messages in which the final message block is already complete. What is the motivation for including a padding block when padding is not needed.
Assume that sender sends silence suppressed RTP stream of G.711 audio to receiver. During talk spurt 20 msecs chunks of quantized audio samples are encapsulated. Determine number of samples are included in each packet?
Suppose a propagation speed of 100 km/hour. Assume caravan travels 150 km, beginning in front of tollbooth. Calculate the end-to-end delay.
Determine the decryption function. What is the decrypted plaintext?
Describe how relative speed of 100BaseT LANs used at each location compares to accessing WAN link between two sites.
Compare the time for a query and response for a complete DNS query and response (to all required nameservers) if M=1, M=2, and M=3.
Given a DAC system explain how a MAC system could be "implemented" on top of this DAC system. Explain any problems and assumptions.
Assume that airliner carries 10,000 kg of those floppies at speed of 1000 km/h over distance of 5000 km. Compute data transmission rate in bits per second of this system?
Explain how systems analyst can help with project management tasks. Also, explain how new employee can contribute to tasks.
With the advent and increasing popularity of social networking, individuals are connected to everyone but connecting to no one.
Write down the advantages of some of the current technologies including VoIP, Unified Communications, Virtual Private Networks.
Conduct Internet search to locate case study which illustrates how VoIP was beneficial to the organization. Why did organization need a VoIP solution?
When a DNS resolver queries the name server, does case of the domain name affect response?
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