Cisco Certified Network Associate (CCNA) Practice Exam

Which command can display the contents of the command history buffer?

1. #show history

2. #show buffer

3. #history

4. #display history

The correct answer is: #show history

The command that displays the contents of the command history buffer is indeed "show history." This command allows users to view a list of commands that have been previously entered in the command-line interface of Cisco devices, providing a convenient way to recall and reuse commands without needing to retype them. The command history is particularly useful for troubleshooting and configuration tasks, as it provides a historical record of actions taken on the device. The command works by querying the device's memory for the command history, which can typically hold a certain number of the most recent commands, depending on the device's configuration. By using this command, users can quickly review commands they have run, identify mistakes, and ensure that they are executing the correct procedures. The other options do not serve this purpose. "Show buffer" does not exist as a standard command for viewing command history. The command "history" on its own is often used to access command history on some platforms but does not provide a formatted list like "show history." Finally, "display history" is not a recognized command in the context of Cisco's command line interface. Knowing the correct command to access command history is a valuable skill for network administrators and engineers, as it enhances efficiency and accuracy in command-line operations.