LX0-104 · Question #51
Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose THREE correct answers.)
The correct answer is B. 10.0.0.0/8 D. 172.16.0.0/12 E. 192.168.0.0/16. IANA reserves specific IPv4 address ranges exclusively for private network use, preventing their routing on the public internet. These ranges include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
Question
Options
- A127.0.0.0/8
- B10.0.0.0/8
- C169.255.0.0/16
- D172.16.0.0/12
- E192.168.0.0/16
How the community answered
(24 responses)- A4% (1)
- B88% (21)
- C8% (2)
Why each option
IANA reserves specific IPv4 address ranges exclusively for private network use, preventing their routing on the public internet. These ranges include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
The 127.0.0.0/8 network is reserved for loopback addresses, primarily 127.0.0.1, used for local host communication, not private network assignment.
The 10.0.0.0/8 network (10.0.0.0 to 10.255.255.255) is one of the three designated private IPv4 address ranges by IANA, as defined in RFC 1918, and addresses within this range are not routed on the public internet.
The 169.255.0.0/16 network is reserved for Automatic Private IP Addressing (APIPA), used when a device cannot obtain an IP address from a DHCP server, not for general private address assignment.
The 172.16.0.0/12 network (172.16.0.0 to 172.31.255.255) is another private IPv4 address range specified in RFC 1918, providing a larger block of private addresses.
The 192.168.0.0/16 network (192.168.0.0 to 192.168.255.255) is the most commonly used private IPv4 address range, also defined in RFC 1918, widely utilized in home and small office networks.
Concept tested: IANA private IPv4 address ranges (RFC 1918)
Source: https://www.rfc-editor.org/rfc/rfc1918.html
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