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CISCO IOS - Coggle Diagram
CISCO IOS
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ACCESS METHOD
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- like Telnet, this access type enables you to configure devices remotely, but it adds an extra layer of security by encrypting all communications using public-key cryptography. SSH uses well known TCP port 22.
- This type of access used to be a common way to access network devices. Telnet is an terminal emulation program that enables you to access IOS through the network and configure the device remotely. The device that is being configured needs to have an Telnet server installed and an IP address configured.
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IOS modes
- this mode is accessed by typing the enable command from the user EXEC mode. This mode can be password protected. In this mode a user can view and change a device’s configuration
- this mode can be accessed by typing the configure terminal command from the privileged EXEC mode. It is used to change the device’s configuration.
- the default mode for the IOS CLI. This is the mode that a user is placed in after accessing the IOS. Only basic commands (like ping or telnet) are available in this mode.
multitasking operating system used on most Cisco routers and switches. IOS has a command-line interface with the predetermined number of multiple-word commands. This operating system is used to configure routing, switching, internetworking and other features supported by a Cisco device.
Cisco IOS Command Hierarchy. As a security feature, Cisco IOS separates EXEC sessions into two different access levels: user EXEC level and privileged EXEC level. User EXEC level allows you to access only basic monitoring commands; privileged EXEC level allows you to access all router commands.
messages can be sent across a data or information network by first converting them into binary digits, or bits. These bits are then encoded into a signal that can be transmitted over the appropriate medium. In computer networks, the media is usually a type of cable, or a wireless transmission.
