Chapter 2 Configure a Network Operating System

Introduction to Networks v5.1
Chapter 2:
Configure a Network Operating
System
Jupriyadi, S.Kom., M.T.
July 2020

© 2013 Cisco and/or its affiliates. All rights reserved. Cisco Public 2
2.0 Introduction
2.1 IOS Bootcamp
2.2 Basic Device Configuration
2.3 Address Schemes
2.4 Summary

Upon completion of this section, you should be able to:
• Explain the purpose of Cisco IOS.
• Explain how to access a Cisco IOS device for configuration purposes.
• Explain how to navigate Cisco IOS to configure network devices.
• Describe the command structure of Cisco IOS software.

• PC operating systems enable a user to:
• Use a mouse to make selections and run programs.
• Enter text and text-based commands.
• View output on a monitor.
• Cisco IOS enables a network technician to:
• Use a keyboard to run CLI-based network programs.
• Use a keyboard to enter text and text-based commands.
• View output on a monitor.
• All networking devices come with a default IOS.
• It is possible to upgrade the IOS version or feature set.

PuTTY

Tera Term

SecureCRT

• A console connection must be established before initial configuration
of a Cisco device.
• After being consoled in, the network technician will have to navigate
through various command modes of the IOS CLI.
• The Cisco IOS modes use a hierarchical structure and are quite
similar for both switches and routers.
• Video Available

Global Configuration Mode
• To configure the device must enter this mode with configure terminal
command
• Example: Switch(config)#
• CLI configuration changes are made that affect the operation of the
device as a whole
• From this mode, the user can enter different sub-configuration modes
Two common sub-configuration modes include:
• Line Configuration Mode - Used to configure console, SSH, Telnet, or
AUX access. Example: Switch(config-line)#
• Interface Configuration Mode - Used to configure a switch port or
router network interface. Example: Switch(config-if)#
• Video Available

Exit
End or Ctrl+Z
Video Available

Video Available

• Tab – Completes the remainder of a partially typed command or keyword
• Ctrl-R – Redisplays a line
• Ctrl-A – Moves cursor to the beginning of the line
• Ctrl-Z – Exits configuration mode and returns to user EXEC
• Down Arrow – Allows the user to scroll forward through former commands
• Up Arrow – Allows the user to scroll backward through former commands
• Ctrl-Shift-6 – Allows the user to interrupt an IOS process such as ping
or traceroute.
• Ctrl-C – Aborts the current command and exits the configuration mode

Upon completion of this section, you should be able to:
• Configure hostnames on a Cisco IOS device using the CLI.
• Use Cisco IOS commands to limit access to device configurations.
• Use IOS commands to save the running configuration.

Guidelines to Choose a Hostname
Configuring Device Names
Hostnames allow devices to be
identified by network administrators
over a network or the Internet.

Syntax Checker Available

Privileged EXEC Password Example
User EXEC Password Example
VTY Line Password Example

• Use the enable secret command, not the older enable password
command.
• The enable secret command provides greater security because the
password is encrypted.

Console port must be secured.
• Reduces the chance of unauthorized personnel physically plugging
a cable into the device and gaining device access.
VTY lines allow access to a Cisco device via Telnet.
• The number of VTY lines supported varies with the type of device
and the IOS version.

service password-
encryption
• Prevents passwords
from showing up as
plain text when
viewing the
configuration.
• Purpose of this
command is to keep
unauthorized
individuals from
viewing passwords in
the configuration file.
• After this command is
applied, removing the
encryption service
does not reverse the
encryption

• These are an important
part of the legal process
in the event that
someone is prosecuted
for breaking into a device.
• Wording that implies that
a login is "welcome" or
"invited" is not
appropriate.
• Often used for legal
notification because it is
displayed to all
connected terminals.
• Video Available

• Startup
configuration –File stored
in NVRAM that contains all
of the commands that will
be used upon startup or
reboot. NVRAM does not
lose its contents when the
device is powered off.
• Running configuration –
File stored in RAM that
reflects the current
configuration, modifying
affects the operation of a
Cisco device immediately.
RAM loses all of its
content when the device is
powered off or restarted.

• Restore the device to its previous configuration by removing the
changed commands individually.
• Copy the startup configuration file to the running configuration with
the copy startup-config running-config privileged EXEC mode
command.
• Reload the device with the reload command from privileged EXEC
mode.
• Switch# reload
System configuration has been modified. Save? [yes/no]: n
Proceed with reload? [confirm]
• Video Available

Using PuTTY to Capture Console Session

• All session output will be
captured to the file
specified, MySwitchLogs.
• Execute the show
running-config or show
startup-config command
at the privileged EXEC
prompt. Text displayed in
the terminal window will
be placed into the
chosen file.
Enabling Session Logging in PuTTY

Disabling Session Logging in PuTTY

Chapter Objectives:
• Explain how devices communicate across network media.
• Configure a host device with an IP address.
• Verify connectivity between two end devices.

Connecting End Devices
Configuring a Static IP
Address on a Host

• Network communications depend on end user device interfaces, networking
device interfaces, and the cables that connect them.
• Types of network media include twisted-pair copper cables, fiber-optic cables,
coaxial cables, or wireless.
• Different types of network media have different features and benefits.
• Ethernet is the most common local area network (LAN) technology.
• Ethernet ports are found on end user devices, switch devices, and other
networking devices.
• Cisco IOS switches have physical ports for devices to connect to, but they also
have one or more switch virtual interfaces (SVIs). No physical hardware on the
device is associated with it. It is created in software.
• SVI provides a means to remotely manage a switch over a network.

Manually Assigning IPv4
Address InformationEthernet Adapter Properties

Assigning Dynamic Addresses

Verifying Windows PC IP Configuration

• IP address - Together with subnet mask, uniquely identifies end device on internetwork
• Subnet mask - Determines which part of a larger network is used by an IP address
• interface VLAN 1 - Interface configuration mode
• ip address 192.168.10.2 255.255.255.0 - Configures the IP address and subnet mask for
the switch
• no shutdown - Administratively enables the interface
• Switch still needs to have physical ports configured and VTY lines to enable remote
management
Video
Available

Video
Available

Chapter Objectives:
• Explain the features and functions of Cisco IOS Software.
• Configure initial settings on a network device using the Cisco IOS software.
• Given an IP addressing scheme, configure IP address parameters on end
devices to provide end-to-end connectivity in a small to medium-sized business
network.

Chapter 2 Configure a Network Operating System

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Chapter 2 Configure a Network Operating System