N10-005 · Question #525
Which of the following defines an IP address that is NOT routed on the Internet?
The correct answer is C. Private. Private IP addresses, defined in RFC 1918, are reserved ranges that are not routable on the public Internet and must be translated via NAT to communicate externally. Public, multicast, and classful are not the correct term for this concept.
Question
Which of the following defines an IP address that is NOT routed on the Internet?
Options
- AMulticast
- BPublic
- CPrivate
- DClassful
How the community answered
(43 responses)- A2% (1)
- B2% (1)
- C95% (41)
Why each option
Private IP addresses, defined in RFC 1918, are reserved ranges that are not routable on the public Internet and must be translated via NAT to communicate externally. Public, multicast, and classful are not the correct term for this concept.
Multicast addresses (224.0.0.0-239.255.255.255) are used for one-to-many group communication - while some multicast ranges are limited in scope, multicast is not the standard term for non-Internet-routable addresses.
Public IP addresses are the opposite - they are globally unique, registered addresses specifically designed to be routable across the Internet.
RFC 1918 defines three private IP address ranges - 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 - that are reserved for use within private networks and are explicitly non-routable on the public Internet. Internet routers are configured to drop packets sourced from or destined to these addresses, requiring NAT for any external communication.
Classful refers to the older Class A/B/C/D/E IP addressing scheme and describes address structure, not whether an address is routable on the Internet.
Concept tested: RFC 1918 private IP address non-routable ranges
Source: https://datatracker.ietf.org/doc/html/rfc1918
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