why almost all nielsen's Server ip addresses starts with 10?
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Since it is private address, more secure to use.
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Since it is private address, cost effective.
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Since it is public address, more secure to use.
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Since it is public address, cost effective.
IP addresses starting with 10 are private IP addresses (10.0.0.0/8 range). Using private addresses is cost-effective because organizations don't need to purchase public IP addresses for internal infrastructure. Option A incorrectly claims private addresses are 'more secure' - security depends on other factors. Options C and D are wrong because 10.x is private, not public.
Addresses in the 10.0.0.0/8 block are part of the reserved private IP ranges (RFC 1918), which don't need to be purchased or registered like public IP addresses, making them cost-effective for large internal server fleets. They aren't inherently 'more secure' by themselves (security comes from firewalls/NAT), so the security-focused options are less accurate.