JN0-102 · Question #405
Which three protocols are connectionless? (Choose three.)
The correct answer is A. ICMP D. TFTP E. DNS. Connectionless protocols operate without establishing a dedicated end-to-end connection, making them suitable for network diagnostics, simple file transfers, and name resolution services.
Question
Which three protocols are connectionless? (Choose three.)
Options
- AICMP
- BTelnet
- CSSH
- DTFTP
- EDNS
How the community answered
(15 responses)- A87% (13)
- B7% (1)
- C7% (1)
Why each option
Connectionless protocols operate without establishing a dedicated end-to-end connection, making them suitable for network diagnostics, simple file transfers, and name resolution services.
ICMP (Internet Control Message Protocol) is a connectionless protocol used primarily for diagnostic and error-reporting functions for IP operations.
Telnet is a connection-oriented protocol that uses TCP to establish a persistent session for remote terminal access.
SSH (Secure Shell) is a connection-oriented protocol that uses TCP to establish a secure and reliable session for remote command-line access and other network services.
TFTP (Trivial File Transfer Protocol) is a simplified connectionless protocol that uses UDP for basic file transfers without the overhead of TCP.
DNS (Domain Name System) primarily uses UDP for standard queries, making it a connectionless protocol for quick, single-request/single-response queries like resolving domain names to IP addresses.
Concept tested: Connectionless network protocols
Source: https://www.rfc-editor.org/rfc/rfc792
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