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Chapter 1.2 : Classify Network Protocols and Communication - Coggle Diagram
Chapter 1.2 : Classify Network Protocols and Communication
1.2.1 : The purpose of the Cisco
IOS.
Cisco calls its operating system the Cisco Internetwork Operating System or Cisco IOS.
It is the embedded software architecture in all of the Cisco
routers and is also the operating system of the Catalyst switches.
The Cisco IOS provides the following network services
Basic routing and switching functions
Reliable and secure access to networked resources
Network scalability
1.2.2 : Explain how to access a Cisco IOS
device for configuration purpose
Access Methods
Secure Shell (SSH) - Inband method for remotely and securely establishing a CLI session over a network. User authentication,
passwords, and commands sent over the network are encrypted. As a best practice, use SSH instead of Telnet whenever possible.
Console port – Out-of-band serial port used primarily for
management purposes such as the initial configuration of the router.
Telnet – Inband interfaces remotely establishing a CLI session
through a virtual interface, over a network.User authentication,
passwords, and commands are sent over the network in plaintext.
Terminal Emulation Program
: Regardless of access method, a terminal emulation program will be required. Popular terminal emulation programs include PuTTY, Tera
Term, SecureCRT, and OS X Terminal.
IOS Modes
Global Configuration mode
To enter configuration mode, enter the command configure
terminal from privileged mode.
Configuration mode has various submodes, starting with
global configuration mode, which can be identified by the
(config)# prompt following the router name.
This mode allows users to modify the running system
configuration.
User EXEC mode
The user EXEC mode allows only a limited number of basic monitoring commands
This is often referred to as a “view only” mode.
The user EXEC level does not allow any commands that might change the configuration of the router.
The user EXEC mode can be identified by the “>" prompt
Privileged EXEC mode
This mode can be configured to require a password from the
user before accessing it.
Configuration and management commands require that the
network administrator be at the privileged EXEC level.
The privileged EXEC mode accesses all router commands.
Global configuration mode and all other more specific configuration modes can only be reached from the privileged EXEC mode
The command structure
of the Cisco IOS software.
IOS Command Syntax : To determine the keywords and arguments required for a command, refer to the command syntax
IOS Help Features
IOS Command Syntax Check:
The command line interpreter checks an entered command from left to right to determine what action is being requested.
Hot Keys and Shortcuts : Commands and keywords can be shortened to the minimum number of characters that identify a unique selection.
How devices communicate across network media
Overview of Network
