Palo Alto Networks (PANW) Certified Cybersecurity Entry-level Technician (PCCET) Practice Exam

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What does the acronym CIDR represent?

  1. Classful Inter Dependant Routing

  2. Classless Inter-Domain Routing

  3. Classless Inter Dependant Routing

  4. Classful Inter Domain Routing

The correct answer is: Classless Inter-Domain Routing

The acronym CIDR stands for Classless Inter-Domain Routing. This method was introduced to improve the allocation of IP addresses and replace the older classful network design. CIDR allows for more efficient use of the available IP address space by enabling variable-length subnet masking (VLSM), which permits more granular control over how IP address space is divided. This capability helps reduce the overall number of entries in routing tables, making routing more efficient and scalable across the internet. By adopting a classless system, networks can be divided according to their actual needs rather than being limited to fixed class sizes, which often resulted in wasted IP addresses. Understanding CIDR is crucial for anyone involved in network design and management, as it significantly impacts how IP addressing and routing are handled in modern networking scenarios.

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