Asingle central register of ip addresses and names (a dns style system) is an efficient means of translating human readable names to ip addresses. which of the following is not solved by dns?
a. it is inefficient to have everyone on the internet maintain their own list of ip addresses.
b. there are too few ip addresses to meet the current demand.
c. when someone new joins the internet they must inform everyone else of the new ip address
d. when an ip address changes, it is impossible to locate a computer until the owner announces the change.

Given a link with a maximum transmission rate of 32.8 mbps. only two computers, x and y, wish to transmit starting at time t = 0 seconds. computer x sends filex (4 mib) and computer y sends filey (244 kib), both starting at time t = 0. statistical multiplexing is used, with details as follows packet payload size = 1000 bytes packet header size = 24 bytes (overhead) ignore processing and queueing delays assume partial packets (packets consisting of less than 1000 bytes of data) are padded so that they are the same size as full packets. assume continuous alternating-packet transmission. computer x gets the transmission medium first. at what time (t = ? ) would filey finish transmitting? give answer in milliseconds, without units, and round to one decimal places (e.g. for an answer of 0.013777 seconds you would enter "13.8" without the quotes)