2.4 The Domain Name System (DNS)
JimKurose・2 minutes read
DNS is a distributed system that translates host names to IP addresses, functioning at a massive scale and operating at the application layer using TCP and UDP services. It involves a decentralized approach to avoid single points of failure, resolves queries through hierarchical servers, and emphasizes security measures like firewalls and authentication services.
Insights
- DNS is a vital system that translates host names to IP addresses, functioning at a massive scale with high performance, operating at the application layer using TCP and UDP services, and serving various purposes like aliasing, service resolution, and load balancing.
- DNS's decentralized and distributed nature, with a hierarchical structure involving root servers, TLD servers, authoritative name servers, and local DNS servers, ensures resilience against failures, handles trillions of daily requests, employs iterative and recursive queries for resolution, caches data for faster responses, and utilizes resource records like A, NS, CNAME, and MX records in specific formats for query and reply messages, emphasizing the importance of securing DNS through firewalls and authentication services.
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What does DNS stand for?
Domain Name System
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