While working as an IT security manager.

$1.$ Identify and explain the appropriate error control mechanism used, if:

a$.$ The encoded data has some redundant information for recovering from the errors during communication.

b$.$ The encoded data has some redundant information for detection of some corrupted blocks which needs to be retransmitted.

$2.$ Why should you prefix the MIME headers while sending the web pages?

$3.$ You received complaints from a number of employees that some spam messages are being sent by an employee's computer and you found the complaints correct. What is the reason for this type of attack?

$4.$ Voice over IP $($VOIP$)$ is used by your organization for the teleconferencing system by utilizing the UDP for data transmission. What will happen if the UDP Data grams are out of order?