Go back to 351-001 - CCIE Cisco Certified InterNetworking Expert

Question :-

Which control plane problem can be prevented by implementing QoS, and how to eliminate the problem?
BGP instability, by prioritizing Precedence 6 traffic (per RFC 791)
OSPF instability, by using WRED to prioritize Precedence 6 routing updates (per RFC 791)
OSPF instability, by remarking to Precedence 6 (per RFC 791)
BGP instability, by means of traffic shaping updates (per RFC 791)

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