Is DNS a protocol or a service?

(Although many people think “DNS” stands for “Domain Name Server,” it really stands for “Domain Name System.”) DNS is a protocol within the set of standards for how computers exchange data on the internet and on many private networks, known as the TCP/IP protocol suite.

Is DNS a security protocol?

DNS is an old protocol, and it was built without any integrated security. Several solutions have been developed to help secure DNS, including: Reputation Filtering: Like any other Internet user, most malware needs to make DNS requests to find the IP addresses of the sites that it is visiting.

What protocols use DNS?

DNS uses TCP for Zone transfer and UDP for name, and queries either regular (primary) or reverse. UDP can be used to exchange small information whereas TCP must be used to exchange information larger than 512 bytes.

What is a DNS response?

DNS is a query/response protocol. The client queries an information (for example the IP address corresponding to www.google.com) in a single UDP request. This request is followed by a single UDP reply from the DNS server. DNS uses UDP port 53 to connect to the server.

Does DNS use TLS?

The IETF has defined DNS over HTTPS as RFC 8484 and it’s defined DNS over TLS as RFC 7858 and RFC 8310. DNS over TLS uses TCP as the basic connection protocol and layers over TLS encryption and authentication. DNS over HTTPS uses HTTPS and HTTP/2 to make the connection.

What protocol is DNS over TLS?

Transport Layer Security
DNS over TLS (DoT) is a network security protocol for encrypting and wrapping Domain Name System (DNS) queries and answers via the Transport Layer Security (TLS) protocol.

Why DNS uses UDP and not TCP?

Here is why DNS uses UDP. UDP is much faster when compared to TCP. TCP is slow as it uses 3-way handshake. UDP is not reliable, but reliability can be added to the application layer. An application can use UDP can be made reliable by using the timeout and resend at the application layer.