LX0-104 · Question #52
What is true regarding TCP port 23?
The correct answer is A. Port 23 is the well known port for the telnet service which is a plain text protocol that should no. TCP port 23 is officially assigned to the Telnet service, which transmits data, including login credentials, in plain text. Due to its lack of encryption, Telnet is considered insecure and should be avoided for remote access over untrusted networks.
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- APort 23 is the well known port for the telnet service which is a plain text protocol that should no
- BPort 23 is the well known port for the SSH service which provides secure logins.
- CPort 23 is the well known port for the rlogin service which is SSL secured by default.
- DPort 23 is the well known port for the system login services which are encrypted when the user
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(37 responses)- A86% (32)
- B3% (1)
- C8% (3)
- D3% (1)
Why each option
TCP port 23 is officially assigned to the Telnet service, which transmits data, including login credentials, in plain text. Due to its lack of encryption, Telnet is considered insecure and should be avoided for remote access over untrusted networks.
Port 23 is the well-known port assigned to the Telnet protocol, which is a network protocol that transmits all data, including login credentials, in unencrypted plain text. Because of this security vulnerability, it is highly recommended not to use Telnet for remote access over untrusted networks.
Port 22 is the well-known port for the SSH (Secure Shell) service, which provides secure, encrypted communication, not port 23.
The `rlogin` service typically uses TCP port 513 and is not associated with port 23, nor is it SSL secured by default.
While Telnet is a system login service, the statement that services on port 23 are encrypted when the user logs in is incorrect, as Telnet specifically does not encrypt communications.
Concept tested: TCP port 23 and Telnet protocol characteristics
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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