CIS105 discussion questions

#4. Determine the total time it takes to transmit an uncompressed grayscale image (with 8 bits/pixel) from a screen with a resolution of 1,280 × 840 pixels using each of the following media:

a. A 56 Kbps modem

b. A 1.5 Mbps DSL line

c. A 100 Mbps Ethernet link

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 #5. Assume that we need to transmit a 1,440 × 900 uncompressed color image (using 16 bits per color pixel) over a computer network in less than 0.01 second. What is the minimal necessary line speed to meet this goal?

 

#20. What are the advantages of breaking up a single logical message into a number of fixed-sized packets and then sending each one of those packets independently through the network?

 

#1. The following are three possible logon scenarios. Explain why answer (c) below is preferable in terms of system security.

a. Welcome to XYZ computing / Enter username: jones / Invalid username / Enter username:

b. Welcome to XYZ computing / Enter username: smith / Enter password: password / Invalid access / Enter username:

c. Enter username: smith / Enter password: password / Invalid access / Enter username: smith / Enter password: FpQr56 / Welcome to XYZ computing

CIS105 discussion questions