Assess advanced understanding of Paxos, Raft, and PBFT by evaluating their performance (latency, throughput, scalability), fault-tolerance (crash vs Byzantine models, quorum/leader behaviors, recovery and liveness), and security trade-offs (attack surfaces, cryptographic costs). Require analysis of message/algorithmic complexity, empirical or theoretical metrics, scenario-based protocol selection for large-scale deployments, and concise justification of recommendations and mitigations for identified weaknesses.