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Difficulty: Medium
Category: networking
Practice quant interview questions from top firms including Jane Street, Citadel, Two Sigma, DE Shaw, and other leading quantitative finance companies.
Topics: dns, caching, ttl, networking, unordered-map, session-management
In high-frequency trading, DNS resolvers cache IP addresses with a Time-To-Live (TTL) to minimize latency when connecting to exchange endpoints. Tuning TTL values is a critical trade-off: short TTLs add latency from frequent lookups, while long TTLs risk connection failures from stale IPs. Simulating cache hit/miss rates allows engineers to optimize TTLs against expected query patterns and predict system behavior during failovers. Task Implement the function simulate_dns_cache(const std::vector
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