If a network appliance fails to start, standard remote access methods like SSH won't work. Instead, Out-of- Band (OOB) management provides a dedicated access path (e.g., a console port or iDRAC/iLO), allowing administrators to troubleshoot devices even when the network is down.
Breakdown of Options:
A). Crash cart - A physical monitor/keyboard setup, not a remote solution.
B). Jump box - A hardened system used for secure remote access but requires the device to be operational.
C). Secure Shell (SSH) - Requires the device to be fully booted and network-connected.
D). Out-of-band management - # Correct answer. Provides independent access for troubleshooting failed network devices.
Reference:
CompTIA Network+ (N10-009) Official Study Guide - Domain 4.3: Explain network device management concepts.