(ISC)2 Certified in Cybersecurity Practice Exam

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What is port 110 used for?

DNS
LDAP
NetBIOS
POP

The correct answer is: POP

Port 110 is associated with the Post Office Protocol version 3 (POP3), which is used by email clients to retrieve emails from a mail server. POP3 allows users to download their email messages to their local devices, enabling offline access to their emails once they are downloaded. This protocol operates by establishing a connection to the mail server, allowing the client to authenticate and request the retrieval of messages. Understanding the function of port 110 is crucial for comprehending how email communication is structured and how protocols manage email retrieval. While other options listed refer to other services and their respective ports—like DNS for domain name resolution, LDAP for directory services, and NetBIOS for network sharing—port 110 is specifically designated for POP3, highlighting its unique role in email transmission processes.