Comprehensive and Detailed Step-by-Step Explanation:
To answer this question, we need to identify the port numbers associated with email protocols used in client-server communication.
Port 25 (SMTP - Simple Mail Transfer Protocol):
This port is primarily used for sending emails between mail servers and from mail clients to mail servers (sending outbound mail).
SMTP is an essential protocol for email traffic.
[Reference: CompTIA A+ Core 1 Exam Objectives (220-1201), Domain 2.5 – Explain basic wired and wireless networking concepts, including ports and protocols., Port 110 (POP3 - Post Office Protocol v3):, POP3 is used for retrieving emails from a mail server. It is commonly used for downloading email messages to a local client, after which the messages are deleted from the server., While not as commonly used today (due to IMAP being preferred), POP3 is still a recognized email protocol, and its association with port 110 makes it a valid answer., Reference: CompTIA A+ Core 1 Exam Objectives (220-1201), Domain 2.5 – Explain basic wired and wireless networking concepts, including ports and protocols., Incorrect Options:, A. Port 23: This is the Telnet protocol used for remote terminal access. It is not related to email traffic., C. Port 67: This port is associated with the DHCP (Dynamic Host Configuration Protocol) server-to-client communications. It is unrelated to email., E. Port 137: This port is part of NetBIOS, used for name resolution in legacy Windows environments. It is not relevant to email traffic., F. Port 443: This port is used for HTTPS (secure web traffic) and is unrelated to email protocols., Key Takeaway:The two correct port numbers associated with email traffic are B. 25 (SMTP) for sending emails and D. 110 (POP3) for retrieving emails., , , , , ]
