8. Consider the following. You are an ISP and have a group of addresses (CIDR bl
ID: 3712347 • Letter: 8
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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.Explanation / Answer
a) In order to change the address we need to do reconfiguration but it is not possible for long so by using the "longest match" forwarding algorithm, this will shift to other Ip address so that it will handle it.The exception route allows all traffic for 198.9.145.0/24 to be sent to ISP,with the exception of the traffic to 198.9.190.0/24.This is accomplished by having ISP advertise, in addition to its own 198.9.190.0/24.block, a route for 198.9.145.0/24.
b)Remaining nodes in the network will face a problem so we need to takecare that node would not fall in trouble to service by configuring the router to other network ip address we can resolve the problem.
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