Passive optical networks (PONs) require the use of active OEO (optical-electrical-optical) repeaters between the subscriber and service provider. a) true
b) false

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.