Operating Cisco IOS Software Flashcards
SSH is a secure method to remotely access the CLI
Secure Shell (SSH)
Telnet is an unsecure method of establishing a CLI session.
Telnet
Accessing a device CLI through a console connection is also called
out-of-band (OOB)
Because these CLI connections consume network bandwidth, they are also called
in-band access
Allows a person to execute only a limited number of basic monitoring commands.
User EXEC
Allows a person to execute all device commands, for example, all configuration and management commands. This level can be password-protected to allow only authorized users to execute the privileged set of commands.
Privileged EXEC
While in privileged EXEC mode, enter the configure terminal command. Use this mode to configure parameters that apply to the entire device.
Global Configuration Mode
While in global configuration mode, enter the interface command followed by interface label of the interface you wish to configure. Use this mode to configure parameters for the device interfaces.
Interface Configuration Mode
Provides a list of commands or the arguments that are associated with a specific command.
Context-sensitive help
Identifies problems with commands that you have entered so that you can alter or correct them.
Error notification message
You did not enter enough characters for your device to uniquely recognize the command.
% Ambiguous command
You did not enter all keywords or values that are required by this command.
% Incomplete command
You entered the command incorrectly. The ^ marks the first element with the error.
% Invalid input detected at ‘^’ marker
NVRAM is the memory component in the device hardware that retains stored information (for example, it is non-volatile) even after the device is powered down. The configuration file that is stored in the NVRAM is called the startup-config file.
Non-Volatile Random Access Memory (NVRAM)
Once the device has started, the system copies the startup configuration to RAM. The configuration file in RAM is called the running-config file.
random-access memory (RAM)
ROM is a form of permanent storage. This type of Memory contains microcode for basic functions to start and maintain the router. ROM is nonvolatile, so it maintains the memory contents even when the power is turned off.
Read Only Memory (ROM)
Which is used to bring up the router during initialization
The bootstrap code
Which is used to test the basic functionality of the router hardware and determine which components are present
Power-On Self Test (POST) microcode
Includes a low-level operating system that is normally used for manufacturing, testing, troubleshooting, and password recovery. In ROM monitor mode, the router has no routing or IP capabilities.
ROM monitor
Is similar to a hard drive in that the information that the system stores there is retained even when the device is powered off. Cisco IOS Software is stored in flash memory. Flash memory may also store backup configuration files and additional device-related files.
Flash memory
Displays the current running configuration. You can also use filters. For example, you can use the show running-config interface GigabitEthernet0/1 command to display only the interface GigabitEthernet0/1 running configuration.
show running-config
Displays the startup configuration stored in NVRAM.
show startup-config
Enters the Global Configuration Mode, where you can interactively change the configuration in RAM (the running-config), using console or remote terminal access.
configure terminal
Saves the running configuration to startup-config file in NVRAM.
copy startup-config running-config
Deletes the saved startup-config file in NVRAM.
erase startup-config
