Designing Cisco Enterprise Networks (ENSLD) — Question 276

An architect is designing an IPv6 plan using the 2001:adb8:8086:265::/64 network for three branch locations. The design must maximize the number of subnets and minimize the number of wasted IP addresses. The plan must allocate a subnet to these branches:
• Branch A, which supports 1,000 hosts
• Branch B, which supports 256 hosts
• Branch C, which supports 60 hosts

Which configuration set meets these requirements?

Answer options

• A. Branch A - 2001:adb8:8086:265::1:0/112 Branch B - 2001:adb8:8086:265::2:200/119 Branch C - 2001:adb8:8086:265::2:440/122
• B. Branch A - 2001:adb8:8086:265::800/117 Branch B - 2001:adb8:8086:265::1200/119 Branch C - 2001:adb8:8086:265::1480/121
• C. Branch A - 2001:adb8:8086:265::400/118 Branch B - 2001:adb8:8086:265::900/120 Branch C - 2001:adb8:8086:265::940/122
• D. Branch A - 2001:adb8:8086:265::200/119 Branch B - 2001:adb8:8086:265::480/121 Branch C - 2001:adb8:8086:265::520/123

Correct answer: B

Explanation

Option B is correct because it provides sufficient address space for each branch with minimal wastage: Branch A requires /117 to accommodate 1,000 hosts, Branch B requires /119 for 256 hosts, and Branch C needs /121 for 60 hosts. The other options either do not allocate enough addresses for the required hosts or lead to greater address wastage.