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Chapter 1.2: The purpose of the Cisco IOS :fire: - Coggle Diagram
Chapter 1.2: The purpose of the Cisco IOS :fire:
The purpose of the Cisco IOS
Cisco calls:
:check: Cisco Internetwork Operating System
:check: Cisco IOS
The Cisco IOS provides:
:check: Basic routing & switching functions
:check: Reliable & secure access to networked resources
:check: Network scalability
Operating System
Devices require an operating system:
:star: Windows, Mac, & Linux for PCs & laptops
:star: Apple iOS & Android for smart phones and tablets
:star: Cisco IOS for network devices
OS Shell
:star: either a command-line interface (CLI) or a graphical user interface (GUI)
:star: enable the user to interface with applications
OS Kernel
:star: communication directly with the hardware
manages
:star: how hardware resources are used to meet software requirements
Hardware
:star: physical part of a computer including underlying electronics
Purpose of OS
Using a GUI enables a user to:
:black_flag: Use a mouse to make selections and run programs
:black_flag: Enter text and text-based commands
Using a CLI on a Cisco IOS switch or router enables a network technician to:
:black_flag: Use a keyboard to run CLI-based network programs
:black_flag: Use a keyboard to enter text and text-based commands
There are many distinct variations of Cisco IOS:
:black_flag: IOS for switches, routers, and other Cisco networking devices
:black_flag: IOS numbered versions for a given Cisco networking devices
Router user interface
:explode: use a command-line interface (CLI) as the traditional console environment
This environment is accessible through several methods:
:explode: A console uses a low speed serial connection directly from a
computer or terminal
:explode: A dialup connection using a modem or null modem connected
to the router AUX port
:explode: Telnet to the router
Access Methods
The three most common ways to access the IOS are:
:tada: Console port – Out-of-band serial port used primarily for
management purposes
:tada: Secure Shell (SSH) - Inband method for remotely and securely
establishing a CLI session over a network
:tada: Telnet – Inband interfaces remotely establishing a CLI session
through a virtual interface, over a network
IOS Modes
User EXEC mode
:pencil2: allows only a limited number of basic
monitoring commands
:pencil2: often referred to as a “view only” mode
:pencil2: does not allow any commands that
might change the configuration of the router
:pencil2: e can be identified by the “>" prompt
Privileged EXEC mode
:pencil2: accesses all router commands
:pencil2: can be configured to require a password from the
user before accessing it
:pencil2: can be identified by the "#"
prompt
Global Configuration mode
:pencil2: allows users to modify the running system
configuration
:pencil2: To enter configuration mode, enter the command configure
terminal from privileged mode
:pencil2: can be identified by the
(config)# prompt following the router name
Cisco CLI
:champagne: Is the primary user interface used for configuring, monitoring, and maintaining Cisco devices
:champagne: allows you to directly and simply execute
Cisco IOS commands whether using a router console or terminal , or using remote access methods.
Configuration Example:
:silhouette: Router # show running-config
:silhouette: Router (config)# hostname ‘name’
:silhouette: Router (config)# banner motd # ‘banner’ #
:silhouette: Router # copy running-config startup-config
:silhouette: Router (config-if)# ip address 192.168.1.1
Configuration Command Modes
:checkered_flag: called global
configuration or simply, global config
:checkered_flag: Use the configure terminal command to access.
:checkered_flag: Changes made affect the operation of the device
Navigate Between IOS Modes
Various methods can be used to exit / quit configuration
modes:
:check: exit - Used to move from a specific mode to the previous more
general mode
:check: ◦ end - Can be used to exit out of global configuration mode regardless
of which configuration mode you are in
:check: ^z - Works the same as end
Overview of Network Components
Intermediary Network Devices
:fire_engine: Wireless Router
:fire_engine: LAN Switch
:fire_engine: Router
:fire_engine: Multilayer Switch
:fire_engine: Firewall Appliance
Network Media
:film_projector: Copper
:film_projector: Fiber Optic
:film_projector: Wireless
End Devices
:custard: Destop Computer
:custard: Laptop
:custard: Printer
:custard: IP Phone
:custard: Wireless Tablet
:custard: TelePresence Endpoint
Topology
:fountain_pen: Physical Topology
:fountain_pen: Logical Topology
