Identify the concepts, benefits, applications, or requirements of high availability
Link aggregation groups (LAG) and multichassis LAGs (MC-LAGs)
Graceful restart (GR)
Graceful Routing Engine switchover (GRES)
Nonstop active routing (NSR)
Nonstsop bridging (NSB)
Bidirectional Forwarding Detection (BFD)
Virtual Router Redundancy Protocol (VRRP)
Unified In-Service Software Upgrade (ISSU)
Ethernet Ring Protection (ERP)
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