Cisco Certified Network Associate (CCNA) Practice Exam

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What key combination is used to interrupt the boot process for password recovery?

Ctrl+Break
Ctrl+C
Ctrl+Alt+Delete
Ctrl+Shift+R

The correct answer is: Ctrl+Break

The key combination used to interrupt the boot process for password recovery is Ctrl+Break. This combination sends a signal that forces the device, typically a Cisco router or switch, to stop its boot sequence. Interrupting the boot process allows administrators to access the device in a mode where they can perform necessary recovery procedures, such as resetting passwords or changing configurations. During the boot process, especially when a password is forgotten, using Ctrl+Break gives an administrator a critical opportunity to enter into ROMMON mode (or a similar mode depending on the device). This mode provides the functionality needed for tasks like initializing the file system and loading an alternate configuration. Other key combinations do not serve this specific purpose. For instance, Ctrl+C is typically used to terminate a running command or process in a command-line interface rather than interrupting the boot sequence. Ctrl+Alt+Delete is a general-purpose command in operating systems to reboot or access Task Manager and has no functional relevance in network device boot processes. Ctrl+Shift+R does not correspond to a widely recognized command for Cisco devices and doesn't have a documented function related to boot interruption or password recovery.