1.7c - Classful Subnetting (Prof. Messer)

Practice vocabulary flashcards covering IPv4 classes, subnet masks, octet ranges, and key subnetting components based on the CompTIA Network+ N10-009 course.

Class A Address

An IP address category with $8$ bits assigned for the network address and $24$ bits associated with the host address, featuring a default subnet mask of $255.0.0.0$.

Class B Address

An IP address category where the default subnet mask is $255.255.0.0$, meaning $16$ bits are for the network and $16$ bits are for the host.

Class C Address

An IP address category with a default subnet mask of $255.255.255.0$, assigning $24$ bits for the network and $8$ bits for the host.

Class D Range

The range of IP addresses between $224$ and $239$ decimal used for multicast communication.

Class E Range

A reserved range of IP addresses between $240$ and $255$ decimal that is not used for any practical purpose.

First Octet Range (Class A)

IP addresses starting with a first decimal octet between $0$ and $127$.

First Octet Range (Class B)

IP addresses starting with a first decimal octet between $128$ and $191$.

First Octet Range (Class C)

IP addresses starting with a first decimal octet between $192$ and $223$.

Binary Identification (Class A)

An IP address identification method where the very first bit is $0$.

Binary Identification (Class B)

An IP address identification method where the first two bits are $1, 0$.

Binary Identification (Class C)

An IP address identification method where the first three bits are $1, 1, 0$.

Network Address

The address that defines all other devices on a particular subnet, calculated by setting all host bits of that address to $0$.

First Usable Host Address

The IP address that is always exactly one number higher than the network address.

Network Broadcast Address

The last IP address of a particular network address, calculated by setting all host bits to $1$.

Last Usable Host Address

The IP address calculated by looking at the network broadcast address and subtracting $1$ from it.