Imagine that you are designing a NAT box which used port-mapped network address translation (sometimes known as NAPT.) As you do your design, you realize that the 5-tuple discussed in class is not sufficient to keep track of the connections which traverse the NAPT box. It is a good starting point, but the "translation table" in the NAPT box needs additional information. What information is needed in this table and how is the table structured and managed? Describe the use of the table in detail.