Regardless of which connection
method is used, access to the Cisco IOS Software CLI is generally referred to as an EXEC
session.
152 Chapter 2: Ethernet LANs
Configuring Network Devices
The Cisco IOS CLI is used to communicate the con?¬?guration details that implement the
network requirements of an organization. This topic describes the initial steps for starting
and con?¬?guring a Cisco network device.
When a Cisco IOS device is started for the ?¬?rst time, its initial con?¬?guration with default
settings is suf?¬?cient for it to operate at Layer 2. When a Cisco router is started for the ?¬?rst
time, however, the device does not have suf?¬?cient information in its initial con?¬?guration to
operate at Layer 3, because the device management requires IP address information on its
router interfaces, at a minimum. However, when an ???uncon?¬?gured??? Cisco device starts for
the ?¬?rst time, with no ???startup con?¬?guration??? settings, the IOS will prompt you for basic
con?¬?guration information using an interactive dialog mode called setup mode.
This basic con?¬?guration sets up the device with the following information:
?– Protocol addressing and parameter settings, such as con?¬?guring the IP address and
subnet mask on an interface
?– Options for administration and management, such as setting up passwords
In this section, a minimal device con?¬?guration for a switch is discussed.
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