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Tuesday, October 20, 2020

Which of the following can use both TCP and UDP?

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Which of the following can use both TCP and UDP?

  • Telnet
  • FTP
  • SSL
  • DNS
 
Which of the following can use both TCP and UDP?

EXPLANATION

 The correct answer is TCP- Transfers; UDP- Queries. The DNS uses TCP Port 53 for zone transfers, for maintaining coherence between the DNS database and the server. The UDP protocol is used when a client sends a query to the DNS server. The TCP protocol should not be used for queries as it gives a lot of information, which is useful to attackers. To remember this just note the capitalized letters are unique to each other: Tcp = Transfer and Udp = qUeries.
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