Which three protocols are connectionless? (Choose three.)
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A. B. C. D. E.ABC
The correct answers to this question are A. DNS, B. TFTP, and C. ICMP.
A protocol can be either connection-oriented or connectionless. Connection-oriented protocols require the establishment of a logical connection between two endpoints before data can be exchanged. Examples of connection-oriented protocols include TCP and SCTP.
Connectionless protocols, on the other hand, do not require the establishment of a logical connection before data can be exchanged. Each packet is treated independently and is routed based on its destination address. Examples of connectionless protocols include UDP, ICMP, DNS, and TFTP.
Explanation of the protocols mentioned in the question:
A. DNS (Domain Name System): DNS is a protocol used to translate human-readable domain names, such as www.example.com, into IP addresses that can be understood by network devices. DNS is a connectionless protocol that operates over UDP.
B. TFTP (Trivial File Transfer Protocol): TFTP is a simple file transfer protocol used for transferring files between network devices. It is a connectionless protocol that operates over UDP.
C. ICMP (Internet Control Message Protocol): ICMP is a protocol used by network devices to send error messages and operational information about network conditions. It is a connectionless protocol that operates over IP.
D. SSH (Secure Shell): SSH is a protocol used for secure remote access to network devices. It is a connection-oriented protocol that operates over TCP.
E. Telnet: Telnet is a protocol used for remote access to network devices. It is a connection-oriented protocol that operates over TCP.
In conclusion, the three protocols that are connectionless are DNS, TFTP, and ICMP.