ITN_Module_2_Basic_Switch_and_End_Device_Configuration.pdf.pdf

Module 2: Basic Switch and
End Device Configuration
Instructor Materials
Introduction to Networks v7.0
(ITN)

2
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential
Instructor Materials – Module 2 Planning Guide
This PowerPoint deck is divided in two parts:
• Instructor Planning Guide
• Information to help you become familiar with the module
• Teaching aids
• Instructor Class Presentation
• Optional slides that you can use in the classroom
• Begins on slide #13
Note: Remove the Planning Guide from this presentation before sharing with anyone.
For additional help and resources go to the Instructor Home Page and Course
Resources for this course. You also can visit the professional development site on
netacad.com, the official Cisco Networking Academy Facebook page, or Instructor Only
FB group.

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§ To facilitate learning, the following features within the GUI may be included in this module:
What to Expect in this Module
Feature Description
Animations Expose learners to new skills and concepts.
Videos
Expose learners to new skills and concepts.
Check Your
Understanding(CYU)
Per topic online quiz to help learners gauge content understanding.
Interactive Activities A variety of formats to help learners gauge content understanding.
Syntax Checker
Small simulations that expose learners to Cisco command line to practice
configuration skills.
PT Activity
Simulation and modeling activities designed to explore, acquire, reinforce, and
expand skills.

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Feature Description
Hands-On Labs Labs designed for working with physical equipment.
Class Activities These are found on the Instructor Resources page. Class Activities are
designed to facilitate learning, class discussion, and collaboration.
Module Quizzes
Self-assessments that integrate concepts and skills learned throughout the
series of topics presented in the module.
Module Summary Briefly recaps module content.
What to Expect in this Module (Cont.)
§ To facilitate learning, the following features may be included in this module:

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Check Your Understanding
• Check Your Understanding activities are designed to let students quickly determine if they
understand the content and can proceed, or if they need to review.
• Check Your Understanding activities do not affect student grades.
• There are no separate slides for these activities in the PPT. They are listed in the notes area of the
slide that appears before these activities.

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Module 2: Activities
What activities are associated with this module?
Page # Activity Type Activity Name Optional?
2.1.6 Check Your Understanding Cisco IOS Access Recommended
2.2.3 Video IOS CLI Primary Command Modes Recommended
2.2.5 Video Navigate Between IOS Modes Recommended
2.2.7 Syntax Checker Navigate Between IOS Modes Recommended
2.2.8 Check Your Understanding IOS Navigation Recommended
2.3.4 Video Context Sensitive Help and Command Syntax Check Recommended
2.3.6 Video Hot Keys and Shortcuts Recommended
2.3.7 Packet Tracer Navigate the IOS Recommended

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Module 2: Activities (Cont.)
2.3.8 Lab Navigate the IOS by Using Tera Term for Console Connectivity Recommended
2.4.6 Video Secure Administrative Access to a Switch Recommended
2.4.7 Syntax Checker Basic Device Configuration Recommended
2.4.8 Check Your Understanding Basic Device Configuration Recommended
2.5.3 Video Alter the Running Configuration Recommended
2.5.5 Packet Tracer Configure Initial Switch Settings Recommended
2.6.3 Check Your Understanding Ports and Addresses Recommended
2.7.3 Syntax Checker Verify Windows PC IP Configuration Recommended

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Module 2: Activities (Cont.)
2.7.5 Syntax Checker Configure a Switch Virtual Interface Recommended
2.7.6 Packet Tracer Implement Basic Connectivity Recommended
2.8.1 Video Test the Interface Assignment Recommended
2.8.2 Video Test End-to-End Connectivity Recommended
2.9.1 Packet Tracer Basic Switch and End Device Configuration Recommended
2.9.2 Lab Basic Switch and End Device Configuration Recommended

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Module 2: Best Practices
Prior to teaching Module 2, the instructor should:
• Review the activities and assessments for this module.
• Try to include as many questions as possible to keep students engaged during classroom
presentation.
Topic 2.1
• Ask the students or have a class discussion
• What are the advantages and disadvantages of using a GUI interface or CLI?
• Why is SSH more important to use instead of Telnet?
• If available, show the class how to remotely access a switch by using a terminal emulation program such as Tera Term or
PuTTY.

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Module 2: Best Practices (Cont.)
Topic 2.2
• Explain the differences between User EXEC mode and Privileged EXEC mode. You can write the switch prompts on the
board and explain the prompts will display the current mode.
• Why do you think the commands available in User EXEC mode are limited?
• What are the differences between Privilege EXEC mode and Global Configuration mode?
• Draw the different IOS mode prompts on the board and explain the differences between the configuration modes and
how to tell which mode the switch is currently in.
Topic 2.3
• Draw the basic IOS command structure on the board and describe the syntax
• What hot keys or shortcuts do you use on your computers? (F5 to refresh, Ctrl+C to copy, Ctrl+S to save etc.)
• If possible, display the CLI of a switch and show the help feature for various commands.

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Topic 2.4
• Explain the guidelines for naming a network device and why the default name should be changed.
• Why would you want to encrypt all the passwords on a switch?
• Why is a banner important to configure on a network device?
Topic 2.5
• What would be a disadvantage of reloading a switch?
• What is the difference between the running-config and the startup-config?
• If possible, walkthrough an example of capturing the running-config or startup-config to a text file.

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Topic 2.6
• Name some end devices that are configured with IP addresses. Why do they need to be configured with an IP address?
• If available, show various network media such as Ethernet cables or fiber-optic cables and how they connect to a port on
the switch.
Topic 2.7
• Have you ever configured your computer with a manual IP address?
• Why do you need to use the no shutdown command on an interface?
Topic 2.8
• Why is it important to test end-to-end connectivity?

Introductions to Networks v7.0
(ITN)
Module 2: Basic Switch and
End Device Configuration

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Module Objectives
Module Title: Basic Switch and End Device Configuration
Module Objective: Implement initial settings including passwords, IP addressing, and default gateway
parameters on a network switch and end devices.
Topic Title Topic Objective
Cisco IOS Access
Explain how to access a Cisco IOS device for configuration
purposes.
IOS Navigation
Explain how to navigate Cisco IOS to configure network
devices.
The Command Structure Describe the command structure of Cisco IOS software.
Basic Device Configuration Configure a Cisco IOS device using CLI.
Save Configurations Use IOS commands to save the running configuration.
Ports and Addresses Explain how devices communicate across network media.
Configure IP Addressing Configure a host device with an IP address.
Verify Connectivity Verify connectivity between two end devices.

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2.1 Cisco IOS Access

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Cisco IOS Access
Operating Systems
• Shell - The user interface that allows
users to request specific tasks from
the computer. These requests can be
made either through the CLI or GUI
interfaces.
• Kernel - Communicates between the
hardware and software of a computer
and manages how hardware
resources are used to meet software
requirements.
• Hardware - The physical part of a
computer including underlying
electronics.

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Cisco IOS Access
GUI
• A GUI allows the user to interact with the
system using an environment of
graphical icons, menus, and windows.
• A GUI is more user-friendly and requires
less knowledge of the underlying
command structure that controls the
system.
• Examples of these are: Windows,
macOS, Linux KDE, Apple iOS and
Android.
• GUIs can fail, crash, or simply not
operate as specified. For these reasons,
network devices are typically accessed
through a CLI.

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Cisco IOS Access
Purpose of an OS
PC operating system enables a user to do
the following:
• Use a mouse to make selections
and run programs
• Enter text and text-based
commands
• View output on a monitor
CLI-based network operating system enables a
network technician to do the following:
• Use a keyboard to run CLI-based
network programs
• Use a keyboard to enter text and
text-based commands
• View output on a monitor

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Cisco IOS Access
Access Methods
• Console – A physical management port
used to access a device in order to
provide maintenance, such as
performing the initial configurations.
• Secure Shell (SSH) – Establishes a
secure remote CLI connection to a
device, through a virtual interface, over a
network. (Note: This is the recommended
method for remotely connecting to a
device.)
• Telnet – Establishes an insecure remote
CLI connection to a device over the
network. (Note: User authentication,
passwords and commands are sent over the
network in plaintext.)

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Cisco IOS Access
Terminal Emulation Programs
• Terminal emulation programs are used to connect to a network device by either a console
port or by an SSH/Telnet connection.
• There are several terminal emulation programs to chose from such as PuTTY, Tera Term
and SecureCRT.

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2.2 IOS Navigation

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IOS Navigation
Primary Command Modes
User EXEC Mode:
• Allows access to only a limited
number of basic monitoring
commands
• Identified by the CLI prompt
that ends with the > symbol
Privileged EXEC Mode:
• Allows access to all
commands and features
• Identified by the CLI prompt
that ends with the # symbol

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IOS Navigation
Configuration Mode and Subconfiguration Modes
Global Configuration Mode:
• Used to access
configuration options on the
device
Line Configuration Mode:
• Used to configure console,
SSH, Telnet or AUX access
Interface Configuration Mode:
• Used to configure a switch
port or router interface

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IOS Navigation
Video – IOS CLI Primary Command Modes
This video will cover the following:
• User EXEC mode
• Privilege EXEC mode
• Global Config mode

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IOS Navigation
Navigation Between IOS Modes
§ Privileged EXEC Mode:
• To move from user EXEC mode to privilege
EXEC mode, use the enabled command.
§ Global Configuration Mode:
• To move in and out of global configuration
mode, use the configure terminal
command. To return to privilege EXEC
mode, use the exit command.
§ Line Configuration Mode:
• To move in and out of line configuration
mode, use the line command followed by
the management line type. To return to
global configuration mode, use the exit
command.

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IOS Navigation
Navigation Between IOS Modes (Cont.)
Subconfiguration Modes:
• To move out of any subconfiguration mode to
get back to global configuration mode, use
the exit command. To return to privilege
EXEC mode, use the end command or key
combination Ctrl +Z.
• To move directly from one subconfiguration
mode to another, type in the desired
subconfiguration mode command. In the
example, the command prompt changes from
(config-line)# to (config-if)#.

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IOS Navigation
Video – Navigation Between IOS Modes
• enable
• disable
• configure terminal
• exit
• end
• Control + Z on keyboard
• Other commands to enter sub configuration modes

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2.3 The Command Structure

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The Command Structure
Basic IOS Command Structure
• Keyword – This is a specific parameter defined in the operating system (in the figure, ip
protocols).
• Argument - This is not predefined; it is a value or variable defined by the user (in the
figure, 192.168.10.5).

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IOS Command Syntax Check
A command might require one or more arguments. To determine the keywords
and arguments required for a command, refer to the command syntax.
• Boldface text indicates commands and keywords that are entered as shown.
• Italic text indicates an argument for which the user provides the value.
Convention Description
boldface
Boldface text indicates commands and keywords that you enter literally as
shown.
italics Italic text indicates arguments for which you supply values.
[x] Square brackets indicate an optional element (keyword or argument).
{x} Braces indicate a required element (keyword or argument).
[x {y | z }]
Braces and vertical lines within square brackets indicate a required choice
within an optional element. Spaces are used to clearly delineate parts of the
command.

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IOS Command Syntax Check (Cont.)
§ The command syntax provides the pattern, or format, that must be used when
entering a command.
§ The command is ping and the user-defined
argument is the ip-address of the
destination device. For example, ping
10.10.10.5.
§ The command is traceroute and the
user-defined argument is the ip-
address of the destination device. For
example, traceroute 192.168.254.254.
§ If a command is complex with multiple arguments, you may see it represented like this:

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IOS Help Features
The IOS has two forms of help available: context-sensitive help and command
syntax check.
• Context-sensitive help enables you to
quickly find answers to these questions:
• Which commands are available in each command
mode?
• Which commands start with specific characters or
group of characters?
• Which arguments and keywords are available to
particular commands?
• Command syntax check verifies that
a valid command was entered by
the user.
• If the interpreter cannot understand the
command being entered, it will provide
feedback describing what is wrong with
the command.

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Video – Context Sensitive Help and Command Syntax Checker
• Use the help command in user EXEC, privileged EXEC, and global config mode
• Finish commands and arguments with the help command
• Use the command syntax checker to fix syntax errors and incomplete commands

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Hot Keys and Shortcuts
• The IOS CLI provides hot keys and shortcuts that make configuring, monitoring, and
troubleshooting easier.
• Commands and keywords can be shortened to the minimum number of characters
that identify a unique selection. For example, the configure command can be
shortened to conf because configure is the only command that begins with conf.

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Hot Keys and Shortcuts (Cont.)
§ The table below is a brief list of keystrokes to enhance command line editing.
Keystroke Description
Tab Completes a partial command name entry.
Backspace Erases the character to the left of the cursor.
Left Arrow or Ctrl+B Moves the cursor one character to the left.
Right Arrow or Ctrl+F Moves the cursor one character to the right.
Up Arrow or Ctrl+P
Recalls the commands in the history buffer, beginning with
the most recent commands.

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Hot Keys and Shortcuts (Cont.)
• When a command output produces more text
than can be displayed in a terminal window,
the IOS will display a “--More--” prompt. The
table below describes the keystrokes that can
be used when this prompt is displayed.
• The table below lists commands that can
be used to exit out of an operation.
Note: To see more hot keys and shortcuts refer to 2.3.5.
Ctrl-C
When in any configuration mode, ends the
configuration mode and returns to privileged EXEC
mode.
Ctrl-Z
When in any configuration mode, ends the
configuration mode and returns to privileged EXEC
mode.
Ctrl-Shift-6
All-purpose break sequence used to abort DNS
lookups, traceroutes, pings, etc.
Enter Key Displays the next line.
Space Bar Displays the next screen.
Any other key
Ends the display string, returning to
privileged EXEC mode.

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Video – Hot Keys and Shortcuts
• Tab key (tab completion)
• Command shortening
• Up and down arrow key
• CTRL + C
• CTRL + Z
• CTRL + Shift + 6
• CTRL + R

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Packet Tracer – Navigate the IOS
In this Packet Tracer, you will do the following:
• Establish Basic Connections, Access the CLI, and Explore Help
• Explore EXEC Modes
• Set the Clock

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Lab – Navigate the IOS by Using Tera Term for Console
Connectivity
In this lab, you complete the following objectives:
• Access a Cisco Switch through the Serial Console Port
• Display and Configure Basic Device Settings
• (Optional) Access a Cisco Router Using a Mini-USB Console Cable

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2.4 Basic Device Configuration

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Basic Device Configuration
Device Names
• The first configuration command on any device should be to
give it a unique hostname.
• By default, all devices are assigned a factory default name.
For example, a Cisco IOS switch is "Switch.”
• Guideline for naming devices:
• Start with a letter
• Contain no spaces
• End with a letter or digit
• Use only letters, digits, and dashes
• Be less than 64 characters in length
Note: To return the switch to the default
prompt, use the no hostname global
config command.

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Password Guidelines
• The use of weak or easily guessed passwords are a security concern.
• All networking devices should limit administrative access by securing privileged EXEC,
user EXEC, and remote Telnet access with passwords. In addition, all passwords should
be encrypted and legal notifications provided.
• Password Guidelines:
• Use passwords that are more than eight
characters in length.
• Use a combination of upper and lowercase
letters, numbers, special characters, and/or
numeric sequences.
• Avoid using the same password for all devices.
• Do not use common words because they are
easily guessed.
Note: Most of the labs in this course use simple
passwords such as cisco or class. These passwords
are considered weak and easily guessable and should
be avoided in production environments.

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Configure Passwords
Securing user EXEC mode access:
• First enter line console configuration mode
using the line console 0 command in global
configuration mode.
• Next, specify the user EXEC mode password
using the password password command.
• Finally, enable user EXEC access using
the login command.
Securing privileged EXEC mode access:
• First enter global configuration mode.
• Next, use the enable secret password command.

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Configure Passwords (Cont.)
Securing VTY line access:
• First enter line VTY configuration mode
using the line vty 0 15 command in
global configuration mode.
• Next, specify the VTY password using
the password password command.
• Finally, enable VTY access using
the login command.
§ Note: VTY lines enable remote access using Telnet or SSH to the device. Many Cisco
switches support up to 16 VTY lines that are numbered 0 to 15.

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Encrypt Passwords
§ The startup-config and running-config files
display most passwords in plaintext.
§ To encrypt all plaintext passwords, use
the service password-encryption global config
command.
§ Use the show running-config command
to verify that the passwords on the device
are now encrypted.

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Banner Messages
§ A banner message is important to warn
unauthorized personnel from attempting
to access the device.
§ To create a banner message of the day
on a network device, use the banner
motd # the message of the day # global
config command.
Note: The “#” in the command syntax is called
the delimiting character. It is entered before
and after the message.
The banner will be displayed on attempts to access the device.

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Video – Secure Administrative Access to a Switch
• Access the command line to secure the switch
• Secure access to the console port
• Secure virtual terminal access for remote access
• Encrypt passwords on the switch
• Configure the banner message
• Verify security changes

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2.5 Save Configurations

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Save Configurations
Configuration Files
§ There are two system files that store the device configuration:
• startup-config - This is the saved configuration file that is stored in NVRAM. It contains all the commands that will be
used by the device upon startup or reboot. Flash does not lose its contents when the device is powered off.
• running-config - This is stored in Random Access Memory (RAM). It reflects the current configuration. Modifying a
running configuration affects the operation of a Cisco device immediately. RAM is volatile memory. It loses all of its
content when the device is powered off or restarted.
• To save changes made to the running configuration to the startup configuration file, use the copy running-config
startup-config privileged EXEC mode command.

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Save Configurations
Alter the Running Configurations
If changes made to the running config do not
have the desired effect and the running-config
has not yet been saved, you can restore the
device to its previous configuration. To do this
you can:
• Remove the changed commands individually.
• Reload the device using the reload command
in privilege EXEC mode. Note: This will cause
the device to briefly go offline, leading to
network downtime.
If the undesired changes were saved to the
startup-config, it may be necessary to clear all
the configurations using the erase startup-
config command in privilege EXEC mode.
• After erasing the startup-config, reload the
device to clear the running-config file from
RAM.

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Save Configurations
Video – Alter the Running Configuration
• Copy the running-config file to the startup-config file
• Show the files in the flash or NVRAM directory
• Use command shortening
• Erase the startup-config file
• Copy the start-config file to the running-config file

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Save Configurations
Capture Configuration to a Text File
Configuration files can also be saved and
archived to a text document.
• Step 1. Open terminal emulation software,
such as PuTTY or Tera Term, that is already
connected to a switch.
• Step 2. Enable logging in to the terminal
software and assign a name and file location to
save the log file. The figure displays that All
session output will be captured to the file
specified (i.e., MySwitchLogs).

53
Save Configurations
Capture Configuration to a Text File (Cont.)
• Step 3. 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.
• Step 4. Disable logging in the terminal
software. The figure shows how to disable
logging by choosing the None session logging
option
Note: The text file created can be used as a record of
how the device is currently implemented. The file could
require editing before being used to restore a saved
configuration to a device.

54
Save Configurations
Packet Tracer – Configure Initial Switch Settings
• Verify the Default Switch Configuration
• Configure a Basic Switch Configuration
• Configure a MOTD Banner
• Save Configuration Files to NVRAM
• Configure a second Switch

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2.6 Ports and Addresses

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Ports and Addresses
IP Addresses
• The use of IP addresses is the primary means of
enabling devices to locate one another and
establish end-to-end communication on the
internet.
• The structure of an IPv4 address is called dotted
decimal notation and is represented by four
decimal numbers between 0 and 255.
• An IPv4 subnet mask is a 32-bit value that
differentiates the network portion of the address
from the host portion. Coupled with the IPv4
address, the subnet mask determines to which
subnet the device is a member.
• The default gateway address is the IP address of
the router that the host will use to access remote
networks, including the internet.

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Ports and Addresses
IP Addresses (Cont.)
• IPv6 addresses are 128 bits in length and
written as a string of hexadecimal values.
Every four bits is represented by a single
hexadecimal digit; for a total of 32
hexadecimal values. Groups of four
hexadecimal digits are separated by a colon
“:”.
• IPv6 addresses are not case-sensitive and
can be written in either lowercase or
uppercase.
Note: IP in this course refers to both the IPv4 and IPv6
protocols. IPv6 is the most recent version of IP and is
replacing the more common IPv4.

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Ports and Addresses
Interfaces and Ports
• 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. Some of
the differences between various types of
media include:
• Distance the media can successfully carry a signal
• Environment in which the media is to be installed
• Amount of data and the speed at which it must be
transmitted
• Cost of the media and installation

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2.7 Configure IP Addressing

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Configure IP Addressing
Manual IP Address Configuration for End Devices
• End devices on the network need an IP address in
order to communicate with other devices on the
network.
• IPv4 address information can be entered into end
devices manually, or automatically using Dynamic
Host Configuration Protocol (DHCP).
• To manually configure an IPv4 address on a Windows
PC, open the Control Panel > Network Sharing
Center > Change adapter settings and choose the
adapter. Next right-click and select Properties to
display the Local Area Connection Properties.
• Next, click Properties to open the Internet Protocol
Version 4 (TCP/IPv4) Properties window. Then
configure the IPv4 address and subnet mask
information, and default gateway. Note: IPv6 addressing and configuration
options are similar to IPv4.

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Automatic IP Address Configuration for End Devices
• DHCP enables automatic IPv4 address
configuration for every end device that is
DHCP-enabled.
• End devices are typically by default
using DHCP for automatic IPv4 address
configuration.
• To configure DHCP on a Windows PC, open
the Control Panel > Network Sharing
Center > Change adapter settings and
choose the adapter. Next right-click and
select Properties to display the Local Area
Connection Properties.
• Next, click Properties to open the Internet
Protocol Version 4 (TCP/IPv4)
Properties window, then select Obtain an
IP address automatically and Obtain DNS
server address automatically.
Note: IPv6 uses DHCPv6 and SLAAC (Stateless Address
Autoconfiguration) for dynamic address allocation.

62
Switch Virtual Interface Configuration
To access the switch remotely, an IP address and a subnet mask must be configured on
the SVI.
To configure an SVI on a switch:
• Enter the interface vlan 1 command in global configuration mode.
• Next assign an IPv4 address using the ip address ip-address subnet-mask command.
• Finally, enable the virtual interface using the no shutdown command.

63
Packet Tracer – Implement Basic Connectivity
§ Perform a Basic Configuration on two switches
§ Configure the PCs
§ Configure the Switch Management Interface

64
2.8 Verify Connectivity

65
Verify Connectivity
Video – Test the Interface Assignment
§ Connect a console cable from the PC to the switch
§ Use the terminal emulation program and accept the defaults to bring you to the command line
§ Use enable to enter privileged EXEC mode
§ Use the global configuration mode and the interface configuration mode to enter the no shutdown
command

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Verify Connectivity
Video – Test End-to-End Connectivity
This video will cover the use of the ping command to test connectivity on both switches and both
PCs.

67
2.9 Module Practice and Quiz

68
Module Practice and Quiz
Packet Tracer – Basic Switch and End Device Configuration
§ Configure hostnames and IP addresses on two switches
§ Use Cisco IOS commands to specify or limit access to the device configurations
§ Use IOS commands to save the running configuration
§ Configure two host devices with IP addresses
§ Verify connectivity between the two PC end devices

69
Lab – Basic Switch and End Device Configuration
In this lab, you complete the following objectives:
• Set Up the Network Topology
• Configure PC Hosts
• Configure and Verify Basic Switch Settings

70
What did I learn in this module?
• All end devices and network devices require an operating system (OS).
• Cisco IOS software separates management access into the following
two command modes: User EXEC Mode and Privileged EXEC Mode.
• Global configuration mode is accessed before other specific
configuration modes. From global config mode, the user can enter
different subconfiguration modes.
• Each IOS command has a specific format or syntax and can only be
executed in the appropriate mode.
• Basic device configurations- hostname, password, encrypt passwords
and banner.
• There are two system files that store the device configuration: startup-
config and running-config.
• IP addresses enable devices to locate one another and establish end-
to-end communication on the internet. Each end device on a network
must be configured with an IP address.

71
Module 2 : Basic Switch and End Device Configuration
New Terms and Commands
• operating system (OS)
• CLI
• GUI
• shell
• kernel
• hardware
• console
• Secure Shell (SSH)
• Telnet
• terminal emulation
programs
• user EXEC mode
• privileged EXEC mode
• line configuration mode
• interface configuration mode
• Enable
• configure terminal
• exit
• end
• argument
• keyword
• command syntax
• ping
• traceroute
• help command ”?”
• hot keys
• hostname
• console
• enable secret
• VTY line
• show running-config
• banner motd
• startup-config
• running-config
• reload
• erase startup-config
• DHCP
• switch virtual interface (SVI)
• ipconfig
• show ip int brief

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