Solution

Statement D is incorrect because CIDR can indeed be applied to both IPv4 and IPv6 addressing. In fact, CIDR was developed to address the limitations of the traditional classful addressing system, allowing for more efficient allocation of IP addresses and supporting variable-length subnet masking (VLSM). By replacing class-based systems, CIDR enables more flexible and efficient routing and improves the scalability of large networks. The use of CIDR in IPv6 helps further enhance these capabilities, making it an essential component of modern networking. Why Other Options are Incorrect: A) CIDR allows for more efficient allocation of IP addresses.: This statement is true because CIDR eliminates the waste of IP addresses associated with classful networks, enabling more granular allocation. B) CIDR supports variable-length subnet masking (VLSM).: This is also true; CIDR supports VLSM, allowing networks to be divided into subnets of varying sizes. C) CIDR replaces the traditional class-based IP address system.: This statement is true because CIDR was specifically designed to replace the rigid class-based system, enhancing address allocation. E) CIDR improves routing efficiency in large networks.: This statement is co rrect because CIDR reduces the size of routing tables and improves routing efficiency by allowing multiple IP addresses to be represented as a single routing entry.