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A switch that implements layer 3 (or 'subnet') VLANs without
performing any routing function between these VLANs is
referred to as performing 'IP Switching'.
IP Addressing and Subnetting
This section gives basic information needed to configure
your Layer 3 switch for IP routing. The information includes
how IP addresses are broken down and how subnetting
works. You will learn how to assign each interface on the
router an IP address with a unique subnet.
Definitions
•
IP Address – the unique number ID assigned to each host
or interface on a network. IP addresses have the form
xxx.xxx.xxx.xxx.
•
Subnet – a portion of a network sharing a particular network
address.
•
Subnet mask – a 32-bit number used to describe which
portion of a Network Address refers to the subnet and which
portion refers to the host. Subnet masks have the form
xxx.xxx.xxx.xxx.
•
Interface – a network connection
•
IP Interface – another name for subnet.
•
Network Address – the resulting 32-bit number from a
bitwise logical AND operation performed between an IP
address and a subnet mask.
•
Subnet Address – another name for network address.
IP Addresses
The Internet Protocol (IP) was designed for routing data
between network sites. Later, it was adapted for routing
between networks (referred to as "subnets") within a site.
The IP defines a way of generating a unique number that
can be assigned each network in the internet and each of
the computers on each of those networks. This number is
called the IP address.
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