CompTIA Network+ Exam Review

Category - Networking

Which of the following protocols use both TCP and UDP?
  1. FTP
  2. HTTP
  3. DNS
  4. SMTP
Explanation
Answer - C - DNS uses both TCP and UDP for its operation.

Key Takeaway: DNS uses TCP for Zone transfer and UDP for name queries. UDP is used to exchange small information and TCP is used to exchange information larger than 512 bytes.
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