Why is the IPv4 address range of 127.0.0.0/8 not considered part of a subnet class?
A) The 127 network is used only for government and military use
B) The 127 network is not included in most TCP/IP stacks
C) The 127 network cannot be clearly delineated with binary mathematics (it’s a prime number)
D) The 127 network contains reserved addresses
E) Subnet classes are an antiquated descriptor of address segmentation
The answer: D) The 127 network contains reserved addresses
The IP address range from 127.0.0.0 through 127.255.255.255 is reserved for use as loopback addresses in the IPv4 TCP/IP stack. Although 127 is a prime number and the use of subnet classes is quite antiquated, neither of these reasons is why the 127.0.0.0/8 range is usually left out of the Class A subnet.
Want to know more? Watch “Protocols and Addresses.”
The fundamental languages used over our computer networks are a standard set of protocols that are used around the world. In this video, you’ll learn about protocols and the set of standards associated with TCP/IP. You’ll also learn the essentials of TCP/IP and how subnetting can be used to build today’s modern networks.