300-420 Question 6
Select 2An enterprise network is expanding its services globally and requires an efficient IPv4 and IPv6 addressing plan. The plan must ensure scalability, minimize routing table entries, and support future growth. Which two design principles should you follow when creating the addressing plan?
- A
Use summarization to aggregate contiguous address blocks.
- B
Assign addresses on a first-come, first-served basis to maximize address usage.
- C
Implement a hierarchical addressing scheme based on geographic and organizational boundaries.
- D
Use overlapping address ranges to optimize address space utilization.
- E
Allocate IPv6 addresses with a /128 prefix to each device for simplicity.
Show answer and explanation
Correct answers: A, C
Explanation
Creating a structured addressing plan for IPv4 and IPv6 requires scalability, efficiency, and adherence to best practices. Summarization reduces routing complexity, while a hierarchical addressing scheme ensures logical and scalable allocation. These principles are critical for enterprise networks to support growth and operational simplicity.
- A. Correct.
Summarization helps reduce the size of routing tables by aggregating contiguous address blocks, thereby improving scalability and simplifying routing.
- B. Incorrect.
Assigning addresses on a first-come, first-served basis can lead to fragmentation and inefficiency, making it unsuitable for structured addressing plans.
- C. Correct.
A hierarchical addressing scheme allows for logical segmentation of the address space, which improves scalability, manageability, and supports future growth.
- D. Incorrect.
Overlapping address ranges cause conflicts and routing issues, which violate the principles of a structured addressing plan.
- E. Incorrect.
Allocating /128 prefixes to devices is inefficient and does not align with IPv6 best practices, which recommend using /64 prefixes for most subnets.