8. Consider the following. You are an ISP and have a group of addresses (CIDR blocks) to allocate to your customers. You have allocated addresses to a number of customers from a CIDR block of 198.9.128.0/18 (equivalent to the block of Class C addresses 198.9.128.0 through 198.9.191.0). Now one of your clients wants to stop using your ISP service and move to another ISP, while keeping the /24 that you had allocated to it (198.9.145.0/24). You are in a dilemma, as you cannot take back this address (the client's lawyers are better than yours!), yet advertising a CIDR block that contains that address seems to break the rules of CIDR routing. a. Show how routing based on the longest (most specific) match allows you to continue advertising this CIDR block. Show what happens to the ex-customer's traffic if there is a bug in the Internet and its route gets dropped. b