DNS, TCP, and UDP Quiz

What is the primary purpose of DNS (Domain Name System) in networking?

• To assign IP addresses to devices

• To resolve hostnames to IP addresses

• To establish secure connections

• To control data flow over the internet

Which of the following protocols does DNS primarily use?

• TCP

• UDP

• ICMP

• FTP

What port number does DNS use by default?

• 53

• 80

• 443

• 25

In DNS, what type of record is used to resolve an IP address to a hostname?

• A record

• MX record

• PTR record

• CNAME record

True or False: DNS queries can be transmitted over both UDP and TCP.

• True

• False

Which of the following best describes the main difference between TCP and UDP?

• TCP is connectionless, while UDP is connection-oriented

• TCP is connection-oriented, while UDP is connectionless

• Both are connection-oriented

• Both are connectionless

How many messages does TCP take to establish a connection to another site?

• One

• Two

• Three

• Four

Which of the following scenarios would likely use UDP instead of TCP?

• File transfers

• Web page loading

• Video streaming

• Email transmission

Name one key feature of TCP that ensures data is received in the correct order and without errors.

• Streaming

• Sequence numbers

• Checksum

• Sliding Window

UDP does not provide error correction or recovery. Why might this be advantageous in some applications?

• It reduces latency

• It increases reliability

• It prevents data duplication

• It ensures secure communication