Subnets And Using A Subnet Mask; Logging In As A Default User - 3Com SuperStack 3 Switch 4300 Getting Started Manual

Subnets and Using a
Subnet Mask
Logging in as a
Default User
Obtaining a Registered IP Address
InterNIC Registration Services is the organization responsible for
supplying registered IP addresses. The following contact information is
correct at time of publication:
World Wide Web site: http://www.internic.net
You can divide your IP network into sub-networks also known as subnets.
Support for subnets is important because the number of bits assigned to
the device part of an IP address limits the number of devices that may be
addressed on any given network. For example, a Class C address is
restricted to 254 devices.
If you have a small network (less than 254 devices), you may decide not
to have multiple subnets.
A subnet mask is used to divide the device part of the IP address into two
further parts:
The first part identifies the subnet number.
The second part identifies the device on that subnet.
The bits of the subnet mask are set to 1 if the device is to treat the
corresponding bit in the IP address as part of the original network
number or as part of the subnet number. These bits in the mask are set to
0 if the device is to treat the bit as part of the device number.
If you are unsure about what mask to use, 3Com suggests that you
contact your network administrator.
If you manage a Switch using the web interface or the command line
interface, you need to log in with a valid user name and password. The
Switch has two default user names, and each user name has a different
password and level of access. These default user names are listed in
Table 9.

Logging in as a Default User

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