200-301 Question #160: Real Exam Question with Answer & Explanation

Question

Which two options are the best reasons to use an IPV4 private IP space? (Choose two)

Options

• Ato enable intra-enterprise communication
• Bto implement NAT
• Cto connect applications
• Dto conserve global address space
• Eto manage routing overhead

Explanation

Private IP addresses are essential for internal network communication and play a crucial role in preserving the limited global IPv4 address space.

Common mistakes.

• B. While NAT is often used in conjunction with private IP addresses, the reason for using private IP space isn't to implement NAT, but rather that NAT is a consequence or solution needed when using private IPs for internet access. The primary reasons are internal communication and conservation.
• C. Connecting applications is a general function of IP addresses (both public and private), not a specific reason to choose private IP space over public.
• E. Using private IP space does not inherently manage routing overhead; internal routing within a private space still incurs overhead, and routing to public space via NAT adds complexity rather than reducing overhead.

Concept tested. Purpose and benefits of private IPv4 addressing

Reference. https://learn.microsoft.com/en-us/windows-server/networking/dns/what-is-dns/ipv6-overview#private-ipv4-addresses-and-ipv6-unique-local-addresses

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