Chap 2 Flashcards
What is Kernel ?
Communicates between the hardware and software of a computer and manages how hardware resources are used to meet software requirements.
What is Shell in OS?
The user interface that allows users to request specific tasks from the computer. Request can be made either through CLI or GUI .
How can the user interact with the shell in OS?
The user can interact with the shell using a command-line interface (CLI) or a graphical user interface (GUI).
What is a GUI ?
A GUI such as Windows, macOS, Apple iOS, or Android allows the user to interact with the system using an environment of graphical icons, menus, and windows.
If GUI fails and crashes?
Network devices are typically accessed through a CLI. The CLI is less resource intensive and very stable when compared to a GUI.
What is firmware and what is the most common method for configuring a home router
The operating system on home routers is usually called firmware. The most common method for configuring a home router is by using a web browser-based GUI.
Through a GUI, what can the OS enable a user to do?
Through a GUI, a PC operating system enables a user to do the following:
Use a mouse to make selections and run programs
Enter text and text-based commands
View output on a monitor
Through CLI , what does it enable a network technician to do?
A CLI-based network operating system (e.g., the Cisco IOS on a switch or router) enables a network technician to do the following:
Use a keyboard to run CLI-based network programs
Use a keyboard to enter text and text-based commands
View output on a monitor
What is Console (Acess Methods)?
This is a physical management port that provides out-of-band access to a Cisco device. Out-of-band access refers to access via a dedicated management channel that is used for device maintenance purposes only. The advantage of using a console port is that the device is accessible even if no networking services are configured, such as performing the initial configuration. A computer running terminal emulation software and a special console cable to connect to the device are required for a console connection.
What is Secure Shell (SSH) Acess Methods ?
SSH is an in-band and recommended method for remotely establishing a secure CLI connection, through a virtual interface, over a network. Unlike a console connection, SSH connections require active networking services on the device, including an active interface configured with an address. Most versions of Cisco IOS include an SSH server and an SSH client that can be used to establish SSH sessions with other devices.
What is Telnet Acess Methods?
Telnet is an insecure, in-band method of remotely establishing a CLI session, through a virtual interface, over a network. Unlike SSH, Telnet does not provide a secure, encrypted connection and should only be used in a lab environment. User authentication, passwords, and commands are sent over the network in plaintext. The best practice is to use SSH instead of Telnet. Cisco IOS includes both a Telnet server and Telnet client.
What is User EXEC Mode ? (Command Mode)
This mode has limited capabilities but is useful for basic operations. It allows only a limited number of basic monitoring commands but does not allow the execution of any commands that might change the configuration of the device. The user EXEC mode is identified by the CLI prompt that ends with the > symbol. eg Switch>,Router>
What is Privileged EXEC Mode ? (Command Mode)
To execute configuration commands, a network administrator must access privileged EXEC mode. Higher configuration modes, like global configuration mode, can only be reached from privileged EXEC mode. The privileged EXEC mode can be identified by the prompt ending with the # symbol.EG Switch # , Router #
How is global config mode defined ?
Global configuration mode is identified by a prompt that ends with (config)# after the device name, such as Switch(config)#.Global configuration mode is accessed before other specific configuration modes.
What is Line Configuration Mode ?
Used to configure console, SSH, Telnet, or AUX access. the default prompt for line configuration mode is Switch(config-line)#
