Basic configuration of Networks
Every computer are in some type of network system, whether it’s local area network or wide area network. How are computers computers connected to this networks? To answer that, we must know how to configure a network, just by knowing how to configure a network, we can know how computers are connected to this networks. To start off, there are many types of network devices such as a networking hub, switch, router, and much more.
The first step to configuring a network is preparation. You must know what type of network you are configuring. You need to see if you need just a router or a router and a switch. Routers and switches are hardware that is the headquarters of your network. After preparation, you can go into configuring the network itself.
There is LAN (Local Area Network) and WAN (Wide Area Network). LAN is a computer network that connects a small area, a single building perhaps. Most LAN connect computers to each other, each computer has its own processing unit and executes its own programs, but it can also access data anywhere on the LAN. LAN uses IP to route different destinations on the network.
Then there is WAN (Wide Area Network). A WAN connects two or more LANs and can span a large area. The internet is largest WAN.
Connecting each computer with cables is the physical part, now the software part comes into play. To configure your network, you can use a GUI or CLI. GUI uses a mouse to make selections and run programs. A CLI uses a keyboard to run text-based commands.
There are three access methods, Console, SSH, or Telnet. Console is a physical management port that provides out-of-bad access. The device is accessible even if no networking services have been configured. SSH is a method for remotely establishing a secure CLI connection. SSH provides a secure connection, it provides encrypted password authentication. Telnet is an insecure method, it does not provide a encrypted connection.
Primary Command Modes
User EXEC Mode: Has limited capabilities but its useful for basic operations. Only allows a limited number of basic monitoring commands. Does not allow the execution of any commands that may change configuration of the device. Identified by CLI prompt that ends with >.
Privileged EXEC Mode: Executes configuration commands. Higher configuration mode, like global configuration mode. Identified by the CLI with the prompt ending with the #.
Global Configuration Mode: Mode to configure the device. From this mode, CLI changes are made that affect the operation of the device as a whole. Global Configuration mode is identified with a prompt ending (config)#.
Line Configuration Mode: Used to configure console, SSH, Telnet, or AUX access.
Interface Configuration Mode: Used to configure a switch port or router network interface.
Keyword: a specific parameter defined in the operating system (in the figure, ip protocols)
Argument:not predefined; a value or variable defined by the user
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