DNS (Domain Name System) uses Port 53 TCP/UDP. What are these protocols used for?
TCP- Transfers; UDP- Queries
TCP- Queries ; UDP- Transfers
TCP- Transmit ; UDP- Queries
TCP- Transmit; UDP- Transfers
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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