The command-line interface (CLI) for Cisco switches is very similar to the CLI for Cisco routers.

The help command is issued by entering a question mark (?). When this command is entered at the system prompt, a list of commands available for the current command mode is displayed.

The help command is very flexible. To obtain a list of commands that begin with a particular character sequence, enter those characters followed immediately by the question mark (?). Do not enter a space before the question mark. This form of help is called word help, because it completes a word.

To list keywords or arguments that are associated with a particular command, enter one or more words associated with the command, followed by a space and then a question mark (?). This form of help is called command syntax help, because it provides applicable keywords or arguments based on a partial command.

Interactive Media Activity Fill in the Blanks: Switches and Collision Domain After completing this activity, the student will be able to identify the role of a switch in preventing collisions and reducing collision domains.