Which high availability feature is used to ensure the network continues operating when a device or link fails?

All the listed features contribute to high availability by addressing different potential failure points in a network. Link Aggregation provides link-level redundancy. Graceful Restart ensures the control plane can restart without disrupting the forwarding plane, maintaining traffic flow during a software process failure. Virtual Chassis provides device-level redundancy by allowing multiple switches to operate as a single logical device, enabling another member to take over if the primary fails. Together, they create a multi-layered high availability strategy.

A. Link aggregation is a valid HA feature, but it only addresses link failures, not device or software process failures, making this option incomplete.

B. Graceful Restart is a valid HA feature, but it only addresses control plane process failures, not link or device failures, making this option incomplete.

C. Virtual Chassis is a valid HA feature, but it only addresses device failures, not isolated link or software process failures, making this option incomplete.

1. Juniper Networks. (2024). Junos OS High Availability User Guide. This guide details numerous HA features

including Graceful Restart (Chapter: "Graceful Restart")

Link Aggregation (within "Link Redundancy")

and Virtual Chassis (as a core device-level redundancy technology).

2. Juniper Networks TechLibrary. (2024). Virtual Chassis Feature Guide for Switches. "A Virtual Chassis provides device-level redundancy... If a member switch in a primary role fails

a member switch in a backup role takes over..."

3. Juniper Networks TechLibrary. (2024). Understanding Graceful Restart. "Graceful restart enables a router to continue forwarding packets even while its routing protocol process is restarting."