Multiple TCP connections and its effect on system performance

I cannot figure out how opening multiple simultaneous connections will affect the overall performance of the CPU or are you saying the processor will be stressed with such act that it will eventually collapse? I know the processor deals with each request either by LIFO or FIFO and never gets confused about what to do and I am sure it can handle such pressures like opening multiple pages all at one time well. Please comment this statement.

DNS server

Having a DNS server available to the public can be a tool in the hand for attackers. If anyone is able to use your DNS, they can use it to send a huge amount of traffic to their victim. As a result, the victim would not be able to handle all the traffic and it would be unavailable to others who need to access it. So, we should be configure our DNS server properly and use the best security measurements we can. Please comment this statement.

UDP

UDP uses 1’s complement for its checksums. Suppose you have the following three 16-bit words0100010001000100, 0101010101010101, 0011001100110011. What is the 1’s complement of the sum of these 16-bit words? Why is it that UDP takes 1’s complement of the sum; that is why not just use the sum? With 1’s complement scheme, how does the receiver detects the error? Is it possible that a one bit error will go undetected? How about a two bit error?

Streaming stored audio

Consider streaming stored audio. Does it make sense to run the application over UDP or TCP? Which transport protocol does RealNetworks use? Why? Which transport protocol do the Microsoft streaming products use? Why?

Buffering Streaming Media Data

What is done by the industry to reduce buffer delay in streaming media. Please discuss 3 ways how minimizing buffer delay can be achieved.