DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 81
• 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.
IP addresses use a “dotted decimal” notation. Here are some
examples of IP addresses written in this format:
1. 210.202.204.205
2. 189.21.241.56
3. 125.87.0.1
This allows IP address to be written in a string of 4 decimal
(base 10) numbers. Computers can only understand binary
(base 2) numbers, and these binary numbers are usually
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