CREST Practitioner Security Analyst (CPSA) Practice

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Which protocol uses 172.16.0.0/12 as a private IP range?

HDLC
TCP/IP
VLAN Trunking Protocol
Reserved Internal IPs

The correct answer is: Reserved Internal IPs

The choice that identifies 172.16.0.0/12 as a private IP range is correct because this specific range falls under the category of private IP addresses defined in RFC 1918. Private IP addresses are used within private networks and are not routable on the public internet. The 172.16.0.0/12 range encompasses the addresses from 172.16.0.0 to 172.31.255.255, making it one of several designated private address ranges. In contrast, while HDLC is a data link layer protocol, it does not utilize IP addressing. TCP/IP is a suite of protocols that includes various ranges of IP addresses but does not designate specific private ranges itself. VLAN Trunking Protocol (VTP) is used to manage VLAN configuration but does not pertain to the concept of IP address ranges. Therefore, referring to 172.16.0.0/12 as reserved internal IPs accurately captures its function as a range reserved for use within private networks.