Tcp Port 53 — CompTIA Network+ (N10-009) Practice Questions

TCP port 53 is used by DNS for zone transfers and for responses to queries that exceed the size limit of UDP, which DNS uses by default on port 53 for standard queries. The Network+ N10-009 exam tests port number knowledge extensively, and understanding why DNS uses both UDP and TCP on port 53 for different purposes is a common exam topic. TCP port 53 is also significant from a security standpoint because firewalls are often configured to block or restrict it to prevent unauthorized zone transfers. Candidates should be able to distinguish when DNS traffic will use TCP versus UDP and why that distinction matters for both functionality and security.

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