CLI Modes & Access
This physical connector on a Cisco device, often blue, is used for direct console access.
What is an RJ45 port (or Console port)?
Use this character at the command prompt to get context-sensitive help or list available commands.
What is ? (question mark)?
This command is used to set a password for entering Privileged EXEC mode.
What is enable password?
This component of an Ethernet frame is a 6-byte hardware address unique to each network interface card.
What is a MAC address (Media Access Control address)?
This acronym stands for "Local Area Network."
What is LAN?
This software application, like PuTTY, is used on your PC to connect to a Cisco device's CLI.
What is a terminal emulator?
This command is used to enter Global Configuration mode, allowing you to make widespread changes to the device.
What is configure terminal (or conf t)?
After setting clear-text passwords, this command is used to encrypt them in the configuration output.
What is service password-encryption?
This initial part of an Ethernet frame is a series of alternating 1s and 0s, used for clock synchronization.
What is the Preamble?
In network diagrams, this is the general shape representing the Internet or other large, unspecified networks.
What is a cloud?
This is the initial, limited CLI mode, often identified by the > prompt, primarily for viewing basic information.
What is User EXEC Mode (or User Mode)?
This command is used to view the currently active configuration of a Cisco device, which resides in RAM.
What is show running-config?
This more secure command sets a hashed password for Privileged EXEC mode and takes precedence over enable password.
What is enable secret?
Immediately following the Preamble, this 1-byte field signals the start of the actual Ethernet frame.
What is the SFD (Start Frame Delimiter)?
This process involves adding header and trailer information to data as it moves down through the layers of the OSI model.
What is data encapsulation?
To transition from User EXEC mode to Privileged EXEC mode, you use this command.
What is enable?
To view the configuration that the device will load upon reboot, you would use this command.
What is show startup-config?
To make the changes in your running-config permanent and ensure they survive a reboot, you use this command (or its variations like copy run start).
What is write (or write memory, or copy running-config startup-config)?
This field within the Ethernet header indicates the higher-layer protocol (like IP) that is encapsulated within the frame.
What is the Type field?
These devices are primarily responsible for connecting separate Local Area Networks together.
What are routers?
This cable type, often blue, connects a PC's serial port (via adapter) to a Cisco console port, having a specific pinout configuration.
What is a Rollover Cable?
When in Global Configuration mode, you can execute a Privileged EXEC mode command by preceding it with this keyword.
What is do (e.g., do show running-config)?
To disable or remove a previously configured command, you typically prepend the command with this word.
What is no?
Located at the end of an Ethernet frame, this trailer field is used for error detection.
What is the FCS (Frame Check Sequence)?
Ethernet, including MAC addressing and frame structure, operates primarily at this specific layer of the OSI model.
What is the Data Link Layer (Layer 2)?