TP-Link T1500-28TC TL-SL2428 T1500-28TCUN V1 CLI Reference Guide Guide - Page 26

3. Some commands are global, that means they can be performed in all modes:  show: Display all information of switch, for example: statistic information, port information, VLAN information.  history: Display the commands history. 1.3 Privilege Restrictions This switch's security is divided into four privilege levels: User level, Power User level, Operator level and Admin level. You can define username and password pairs, and assign a specific privilege level to each pair. Different privilege levels have access to specified commands, which is illustrated in the Privilege Requirement in each command. For details about how to configure usename and password pairs, please refer to user name (password) and user name (secret). Users can enter Privileged EXEC mode from User EXEC mode by using the enable command. In default case, no password is needed. In Global Configuration Mode, you can configure password for Admin level by enable password command. Once password is configured, you are required to enter it to access Privileged EXEC mode. 1.4 Conventions 1.4.1 Format Conventions The following conventions are used in this Guide:  Items in square brackets [ ] are optional  Items in braces { } are required  Alternative items are grouped in braces and separated by vertical bars. For example: speed {10 | 100 | 1000 }  Bold indicates an unalterable keyword. For example: show logging  Normal Font indicates a constant (several options are enumerated and only one can be selected). For example: mode {dynamic | static | permanent}  Italic Font indicates a variable (an actual value must be assigned). For example: bridge aging-time aging-time 1.4.2 Special Characters You should pay attentions to the description below if the variable is a character string: 13