300-320 · Question #449
300-320 Question #449: Real Exam Question with Answer & Explanation
The correct answer is E: 10.0.64.0/18. The five existing WAN sites plus three additional sites equals eight total subnets to accommodate. Based on the exhibit's addressing in the 10.0.64.0 range, a /18 prefix (10.0.64.0/18) covers the address space from 10.0.64.0 through 10.0.127.255 - providing 64 blocks sufficient f
Question
Exhibit
Options
- A10.0.60.0/18
- B10.0.64.0/21
- C10.0.64.0/17
- D10.0.0.0/17
- E10.0.64.0/18
Explanation
The five existing WAN sites plus three additional sites equals eight total subnets to accommodate. Based on the exhibit's addressing in the 10.0.64.0 range, a /18 prefix (10.0.64.0/18) covers the address space from 10.0.64.0 through 10.0.127.255 - providing 64 blocks sufficient for 8 or more same-sized subnets. A /21 (option B) is too small to cover all required subnets. A /17 (options C/D) would work but is not the minimum (smallest) summary. The /18 in option E is the most specific summary that covers all existing and three future sites.
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