1. If it happens that a cyberterrorist makes all the DNS servers in the world crash simultaneously. Discuss what does DNS servers provide and how does this cyber-attack scenario affects one's ability to use the Internet.

 

 

2. The following bit stream D=1010001101 is transmitted using the standard CRC method. The generator polynomial is P=x⁵ + x⁴ + x² + 1.. Show with all the details the actual bit string that is transmitted and check that the transmitted message has no error. Suppose the leftmost bit (MSB) of the message is inverted due to noise on the transmission link. Show with all the details that this error is detected at the receiver's end.

 

 

3. If you want to transfer a file between two computers, you can have two acknowledgement strategies to transfer the file. What are these two strategies? Discuss the two scenarios where these two approaches are used.