Billy remembers numbers using images that look somewhat like each number: 0 is a ball, 1 is a stick, 2 is a hanger, 3 is a comb, and 4 is a kite. Using Billy's number images, Ryan remembered a 3-digit phone extension with this story: A person uses a hanger for his coat, and then uses a stick to hit a ball. What number is Billy likely remembering?

Consider the IP address of 182.133.129.55. a) What is the class of this network if classful addressing was used? b) How many bit long is the network-ID if classful addressing was used? c) What is the network ID and host-ID of our computer? d) What is the default network mask? e) How many network hosts (computers) can be addressed in this network?