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© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
Chapter 2:
Configuring a Network
Operating System
Introduction to Networks
Presentation_ID 2© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 2 - Objectives
 Explain the purpose of Cisco IOS.
 Explain how to access and navigate Cisco IOS to configure network
devices.
 Describe the command structure of Cisco IOS software.
 Configure hostnames on a Cisco IOS device using the CLI.
 Use Cisco IOS commands to limit access to device configurations.
 Use Cisco IOS commands to save the running configuration.
 Explain how devices communicate across network media.
 Configure a host device with an IP address.
 Verify connectivity between two end devices.
Presentation_ID 3© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 2
2.1 IOS Bootcamp
2.2 Getting Basic
2.3 Address Schemes
2.4 Summary
Presentation_ID 4© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
2.1 IOS Bootcamp
Presentation_ID 5© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Cisco IOS
Operating Systems
All networking equipment dependent on operating systems
 End users (PCs, laptops, smart phones, tablets)
 Switches
 Routers
 Wireless access points
 Firewalls
Cisco Internetwork Operating System (IOS)
 Collection of network operating systems used on Cisco devices
Presentation_ID 6© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Cisco IOS
Operating Systems
Presentation_ID 7© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Cisco IOS
Purpose of OS
 PC operating systems (Windows 8 & OS X) perform technical
functions that enable
• Use of a mouse
• View output
• Enter text
 Switch or router IOS provides options to
• Configure interfaces
• Enable routing and switching functions
 All networking devices come with a default IOS
 Possible to upgrade the IOS version or feature set
Presentation_ID 8© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Cisco IOS
Location of the Cisco IOS
IOS stored in Flash
 Non-volatile storage – not lost when power is lost
 Can be changed or overwritten as needed
 Can be used to store multiple versions of IOS
 IOS copied from flash to volatile RAM
 Quantity of flash and RAM memory determines IOS that can be used
Presentation_ID 9© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Cisco IOS
IOS Functions
Major functions performed or enabled by Cisco routers and
switches include:
Presentation_ID 10© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing a Cisco IOS Device
Console Access Method
Most common methods to access the Command Line Interface
 Console
 Telnet or SSH
 AUX port
Presentation_ID 11© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing a Cisco IOS Device
Console Access Method
Console port
 Device is accessible even if no networking services have been
configured (out-of-band)
 Need a special console cable
 Allows configuration commands to be entered
 Should be configured with passwords to prevent unauthorized access
 Device should be located in a secure room so console port can not
be easily accessed
Presentation_ID 12© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing a Cisco IOS Device
Telnet, SSH, and AUX Access Methods
Telnet
 Method for remotely accessing the CLI over a network
 Require active networking services and one active interface that is
configured
Secure Shell (SSH)
 Remote login similar to Telnet but utilizes more security
 Stronger password authentication
 Uses encryption when transporting data
Aux Port
 Out-of-band connection
 Uses telephone line
 Can be used like console port
Presentation_ID 13© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing a Cisco IOS Device
Terminal Emulation Programs
Software available for
connecting to a networking
device
 PuTTY
 Tera Term
 SecureCRT
 HyperTerminal
 OS X Terminal
Presentation_ID 14© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Navigating the IOS
Cisco IOS Modes of Operation
Presentation_ID 15© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Navigating the IOS
Primary Modes
Presentation_ID 16© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Navigating the IOS
Global Configuration Mode and Submodes
Presentation_ID 17© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Navigating the IOS
Navigating between IOS Modes
Presentation_ID 18© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Navigating the IOS
Navigating between IOS Modes (cont.)
Presentation_ID 19© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
IOS Command Structure
Presentation_ID 20© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
Cisco IOS Command Reference
To navigate to Cisco’s Command Reference to find a particular
command:
1. Go to www.cisco.com
2. Click Support.
3. Click Networking Software (IOS & NX-OS).
4. Click 15.2M&T (for example).
5. Click Reference Guides.
6. Click Command References.
7. Click the particular technology that encompasses the command you
are referencing.
8. Click the link on the left that alphabetically matches the command
you are referencing.
9. Click the link for the command.
Presentation_ID 21© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
Context Sensitive Help
Presentation_ID 22© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
Command Syntax Check
Presentation_ID 23© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
Hot Keys and Shortcuts
 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
Presentation_ID 24© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
IOS Examination Commands
Presentation_ID 25© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Command Structure
The show version Command
Presentation_ID 26© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
2.2 Getting Basic
Presentation_ID 27© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Hostnames
Why the Switch
Let’s focus on
 Creating a two PC network connected via a switch
 Setting a name for the switch
 Limiting access to the device configuration
 Configuring banner messages
 Saving the configuration
Presentation_ID 28© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Hostnames
Device Names
Some guidelines for naming conventions are that names should:
 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
Without names, network
devices are difficult to
identify for configuration
purposes.
Presentation_ID 29© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Hostnames
Hostnames
Hostnames allow
devices to be
identified by
network
administrators
over a network or
the Internet.
Presentation_ID 30© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Hostnames
Configuring Hostnames
Presentation_ID 31© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Limiting Access to Device Configurations
Securing Device Access
The passwords introduced here are:
 Enable password - Limits access to the privileged
EXEC mode
 Enable secret - Encrypted, limits access to the
privileged EXEC mode
 Console password - Limits device access using the
console connection
 VTY password - Limits device access over Telnet
Note: In most of the labs in this course, we will be
using simple passwords such as cisco or class.
Presentation_ID 32© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Limiting Access to Device Configurations
Securing Privileged EXEC Access
 use the enable secret command, not the
older enable password command
 enable secret provides greater security because
the password is encrypted
Presentation_ID 33© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Limiting Access to Device Configurations
Securing User EXEC Access
 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
• number of vty lines supported varies with the type of
device and the IOS version
Presentation_ID 34© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Limiting Access to Device Configurations
Encrypting Password Display
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
 once applied,
removing the
encryption service
does not reverse
the encryption
Presentation_ID 35© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Limiting Access to Device Configurations
Banner Messages
 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
Presentation_ID 36© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Saving Configurations
Configuration Files
 Switch# reload
System configuration has
been modified. Save?
[yes/no]: n
Proceed with reload?
[confirm]
 Startup configuration is
removed by using
the erase startup-config
Switch# erase startup-config
 On a switch you must
also issue the delete
vlan.dat
Switch# delete vlan.dat
Delete filename [vlan.dat]?
Delete flash:vlan.dat?
[confirm]
Presentation_ID 37© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Saving Configurations
Capturing Text
Presentation_ID 38© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
2.3 Address Schemes
Presentation_ID 39© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Ports and Addresses
IP Addressing in the Large
 Each end device on a
network must be
configured with an IP
address
 Structure of an IPv4
address is called dotted
decimal
 IP address displayed in
decimal notation, with
four decimal numbers
between 0 and 255
 With the IP address, a
subnet mask is also
necessary
 IP addresses can be
assigned to both
physical ports and virtual
interfaces
Presentation_ID 40© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
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
 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
also have one or more switch virtual interfaces (SVIs - no physical
hardware on the device associated with it; created in software)
 SVI provides a means to remotely manage a switch over a network
Presentation_ID 41© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Addressing Devices
Configuring a Switch Virtual Interface
 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
Presentation_ID 42© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Addressing Devices
Manual IP Address Configuration for End Devices
Presentation_ID 43© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Addressing Devices
Automatic IP Address Configuration for End Devices
Presentation_ID 44© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Addressing Devices
IP Address Conflicts
Presentation_ID 45© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Verifying Connectivity
Test the Loopback Address on an End Device
Presentation_ID 46© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Verifying Connectivity
Testing the Interface Assignment
Presentation_ID 47© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Verifying Connectivity
Testing End-to-End Connectivity
Presentation_ID 48© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Configuring a Network Operating System
Chapter 2 Summary
 Services provided by the Cisco IOS accessed using a command-line
interface (CLI)
• accessed by either the console port, the AUX port, or through
telnet or SSH
• can make configuration changes to Cisco IOS devices
• a network technician must navigate through various hierarchical
modes of the IOS
 Cisco IOS routers and switches support a similar operating system
 Introduced the initial settings of a Cisco IOS switch device
• setting a name
• limiting access to the device configuration
• configuring banner messages
• saving the configuration
Presentation_ID 49© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Configuring a Network Operating System
Chapter 2 Summary
Presentation_ID 50© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Configuring a Network Operating System
Chapter 2 Summary
Presentation_ID 51© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential

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Ccna v5-S1-Chapter 2

  • 1. © 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1 Chapter 2: Configuring a Network Operating System Introduction to Networks
  • 2. Presentation_ID 2© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 2 - Objectives  Explain the purpose of Cisco IOS.  Explain how to access and navigate Cisco IOS to configure network devices.  Describe the command structure of Cisco IOS software.  Configure hostnames on a Cisco IOS device using the CLI.  Use Cisco IOS commands to limit access to device configurations.  Use Cisco IOS commands to save the running configuration.  Explain how devices communicate across network media.  Configure a host device with an IP address.  Verify connectivity between two end devices.
  • 3. Presentation_ID 3© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Chapter 2 2.1 IOS Bootcamp 2.2 Getting Basic 2.3 Address Schemes 2.4 Summary
  • 4. Presentation_ID 4© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2.1 IOS Bootcamp
  • 5. Presentation_ID 5© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Cisco IOS Operating Systems All networking equipment dependent on operating systems  End users (PCs, laptops, smart phones, tablets)  Switches  Routers  Wireless access points  Firewalls Cisco Internetwork Operating System (IOS)  Collection of network operating systems used on Cisco devices
  • 6. Presentation_ID 6© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Cisco IOS Operating Systems
  • 7. Presentation_ID 7© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Cisco IOS Purpose of OS  PC operating systems (Windows 8 & OS X) perform technical functions that enable • Use of a mouse • View output • Enter text  Switch or router IOS provides options to • Configure interfaces • Enable routing and switching functions  All networking devices come with a default IOS  Possible to upgrade the IOS version or feature set
  • 8. Presentation_ID 8© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Cisco IOS Location of the Cisco IOS IOS stored in Flash  Non-volatile storage – not lost when power is lost  Can be changed or overwritten as needed  Can be used to store multiple versions of IOS  IOS copied from flash to volatile RAM  Quantity of flash and RAM memory determines IOS that can be used
  • 9. Presentation_ID 9© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Cisco IOS IOS Functions Major functions performed or enabled by Cisco routers and switches include:
  • 10. Presentation_ID 10© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Accessing a Cisco IOS Device Console Access Method Most common methods to access the Command Line Interface  Console  Telnet or SSH  AUX port
  • 11. Presentation_ID 11© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Accessing a Cisco IOS Device Console Access Method Console port  Device is accessible even if no networking services have been configured (out-of-band)  Need a special console cable  Allows configuration commands to be entered  Should be configured with passwords to prevent unauthorized access  Device should be located in a secure room so console port can not be easily accessed
  • 12. Presentation_ID 12© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Accessing a Cisco IOS Device Telnet, SSH, and AUX Access Methods Telnet  Method for remotely accessing the CLI over a network  Require active networking services and one active interface that is configured Secure Shell (SSH)  Remote login similar to Telnet but utilizes more security  Stronger password authentication  Uses encryption when transporting data Aux Port  Out-of-band connection  Uses telephone line  Can be used like console port
  • 13. Presentation_ID 13© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Accessing a Cisco IOS Device Terminal Emulation Programs Software available for connecting to a networking device  PuTTY  Tera Term  SecureCRT  HyperTerminal  OS X Terminal
  • 14. Presentation_ID 14© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Navigating the IOS Cisco IOS Modes of Operation
  • 15. Presentation_ID 15© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Navigating the IOS Primary Modes
  • 16. Presentation_ID 16© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Navigating the IOS Global Configuration Mode and Submodes
  • 17. Presentation_ID 17© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Navigating the IOS Navigating between IOS Modes
  • 18. Presentation_ID 18© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Navigating the IOS Navigating between IOS Modes (cont.)
  • 19. Presentation_ID 19© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure IOS Command Structure
  • 20. Presentation_ID 20© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure Cisco IOS Command Reference To navigate to Cisco’s Command Reference to find a particular command: 1. Go to www.cisco.com 2. Click Support. 3. Click Networking Software (IOS & NX-OS). 4. Click 15.2M&T (for example). 5. Click Reference Guides. 6. Click Command References. 7. Click the particular technology that encompasses the command you are referencing. 8. Click the link on the left that alphabetically matches the command you are referencing. 9. Click the link for the command.
  • 21. Presentation_ID 21© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure Context Sensitive Help
  • 22. Presentation_ID 22© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure Command Syntax Check
  • 23. Presentation_ID 23© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure Hot Keys and Shortcuts  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
  • 24. Presentation_ID 24© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure IOS Examination Commands
  • 25. Presentation_ID 25© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential The Command Structure The show version Command
  • 26. Presentation_ID 26© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2.2 Getting Basic
  • 27. Presentation_ID 27© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Hostnames Why the Switch Let’s focus on  Creating a two PC network connected via a switch  Setting a name for the switch  Limiting access to the device configuration  Configuring banner messages  Saving the configuration
  • 28. Presentation_ID 28© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Hostnames Device Names Some guidelines for naming conventions are that names should:  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 Without names, network devices are difficult to identify for configuration purposes.
  • 29. Presentation_ID 29© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Hostnames Hostnames Hostnames allow devices to be identified by network administrators over a network or the Internet.
  • 30. Presentation_ID 30© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Hostnames Configuring Hostnames
  • 31. Presentation_ID 31© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Limiting Access to Device Configurations Securing Device Access The passwords introduced here are:  Enable password - Limits access to the privileged EXEC mode  Enable secret - Encrypted, limits access to the privileged EXEC mode  Console password - Limits device access using the console connection  VTY password - Limits device access over Telnet Note: In most of the labs in this course, we will be using simple passwords such as cisco or class.
  • 32. Presentation_ID 32© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Limiting Access to Device Configurations Securing Privileged EXEC Access  use the enable secret command, not the older enable password command  enable secret provides greater security because the password is encrypted
  • 33. Presentation_ID 33© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Limiting Access to Device Configurations Securing User EXEC Access  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 • number of vty lines supported varies with the type of device and the IOS version
  • 34. Presentation_ID 34© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Limiting Access to Device Configurations Encrypting Password Display 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  once applied, removing the encryption service does not reverse the encryption
  • 35. Presentation_ID 35© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Limiting Access to Device Configurations Banner Messages  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
  • 36. Presentation_ID 36© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Saving Configurations Configuration Files  Switch# reload System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm]  Startup configuration is removed by using the erase startup-config Switch# erase startup-config  On a switch you must also issue the delete vlan.dat Switch# delete vlan.dat Delete filename [vlan.dat]? Delete flash:vlan.dat? [confirm]
  • 37. Presentation_ID 37© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Saving Configurations Capturing Text
  • 38. Presentation_ID 38© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2.3 Address Schemes
  • 39. Presentation_ID 39© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Ports and Addresses IP Addressing in the Large  Each end device on a network must be configured with an IP address  Structure of an IPv4 address is called dotted decimal  IP address displayed in decimal notation, with four decimal numbers between 0 and 255  With the IP address, a subnet mask is also necessary  IP addresses can be assigned to both physical ports and virtual interfaces
  • 40. Presentation_ID 40© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 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  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 also have one or more switch virtual interfaces (SVIs - no physical hardware on the device associated with it; created in software)  SVI provides a means to remotely manage a switch over a network
  • 41. Presentation_ID 41© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Addressing Devices Configuring a Switch Virtual Interface  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
  • 42. Presentation_ID 42© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Addressing Devices Manual IP Address Configuration for End Devices
  • 43. Presentation_ID 43© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Addressing Devices Automatic IP Address Configuration for End Devices
  • 44. Presentation_ID 44© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Addressing Devices IP Address Conflicts
  • 45. Presentation_ID 45© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Verifying Connectivity Test the Loopback Address on an End Device
  • 46. Presentation_ID 46© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Verifying Connectivity Testing the Interface Assignment
  • 47. Presentation_ID 47© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Verifying Connectivity Testing End-to-End Connectivity
  • 48. Presentation_ID 48© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Configuring a Network Operating System Chapter 2 Summary  Services provided by the Cisco IOS accessed using a command-line interface (CLI) • accessed by either the console port, the AUX port, or through telnet or SSH • can make configuration changes to Cisco IOS devices • a network technician must navigate through various hierarchical modes of the IOS  Cisco IOS routers and switches support a similar operating system  Introduced the initial settings of a Cisco IOS switch device • setting a name • limiting access to the device configuration • configuring banner messages • saving the configuration
  • 49. Presentation_ID 49© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Configuring a Network Operating System Chapter 2 Summary
  • 50. Presentation_ID 50© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Configuring a Network Operating System Chapter 2 Summary
  • 51. Presentation_ID 51© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential