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Cisco IOS, Internetwork Operating System, How devices communicate across…
Cisco IOS
Internetwork Operating System
How devices communicate
across network media
Network Representation
Logical Topology
Physical Topology
Command Structure
How to access
Cisco IOS device
Basic routing and switching functions
Reliable and secure access to networked resources
Network scalability
Console port
Out-of-band serial port used primarily for management purposes.
Secure Shell (SSH)
Inband methods for remotely and securely establishing a CLI session over the network
Telnet
Inband interface remotely establishing a CLI session through a virtual interface over the network.
Purpose of OS
Command Syntax
User EXEC mode
allow limited number basic monitoring commands
does not allow any command that might change configuration of the router.
Privileged EXEC mode
can be configured to require password from the user before accessing it
Global Configuration mode
allow user to modify the running system configuration
enter the command configure terminal from privileged mode to enter configuration mode.
has various submode
IOS mode
