Which statement is true about subnet masks?

Question

Options

• ASubnet masks protect against network hacking from the Internet
• BSubnet masks provide encryption for network traffic
• CSubnet masks are used to divide large network ranges into smaller subnets
• DSubnet masks are components of the DNS

• A
  5% (1)
• C
  89% (17)
• D
  5% (1)

Explanation

Subnet masks work alongside IP addresses to identify which portion of an address belongs to the network and which belongs to the host, allowing large IP ranges to be divided into smaller, more manageable subnets - that's exactly what option C describes. Option A is wrong because subnet masks have no security or filtering function; that's the role of firewalls and access control lists. Option B is wrong because encryption is handled by protocols like TLS/SSL or IPSec, not subnet masks. Option D is wrong because subnet masks operate at Layer 3 (IP addressing) and have nothing to do with DNS, which resolves domain names to IP addresses.

Memory tip: Think of a subnet mask like a highlighter - it highlights which part of an IP address is the "network" portion, helping routers slice a big network into smaller pieces (subnets).

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