3 IP Addressing and Subnets Free Online FlashCards

How is an IPv4 address represented?

An IPv4 address is a 32-bit number written as four decimal octets separated by periods; each octet ranges from 0 to 255.

What does a subnet mask identify?

A subnet mask marks the network portion with 1 bits, followed by host bits set to 0.

What mask and bit split correspond to /24?

The mask is 255.255.255.0, with 24 network bits and 8 host bits.

What does a CIDR prefix length specify?

The number after the slash gives the number of network bits in the address.

Which subnet contains 192.168.10.25/24?

It belongs to the 192.168.10.0/24 subnet.

How do you calculate a subnet's total IPv4 address count?

A subnet with prefix length $p$ contains $2^{32-p}$ total addresses.

Which addresses are available for hosts in 192.168.10.0/24?

A typical /24 has 256 total addresses: the first is the subnet address, the last is broadcast, and .1 through .254 are available for hosts.

How many addresses does a /26 contain?

A /26 contains 64 total addresses, conventionally 62 of them usable for hosts.

Which IPv4 ranges are reserved for private networks?

The reserved private ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

Why are private IPv4 addresses not globally unique?

Private addresses can be reused by different organizations, so they are not globally unique and are not routed across the public Internet.

What distinguishes a public IPv4 address?

Public addresses are globally unique addresses used for Internet routing.

What does NAT commonly enable for privately addressed devices?

A router commonly uses network address translation (NAT) to let devices with private addresses access Internet services.