Which of the following protocols can be both connection-oriented and connectionless?
A. 20 FTP
B. 53 DNS
C. 67 DHCP
D. SO HTTP
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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
DNS has always been designed to use both UDP and TCP port 53 from the start 1 , with UDP being the default, and fall back to using TCP when it is unable to communicate on UDP, typically when the packet size is too large to push through in a single UDP packet.
D should read 80 HTTP and not SO HTTP which is a connection-oriented protocol