A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

• A. HTTP
• B. FTP
• C. POP3
• D. SMTP

Answer: (C)

When a packet is received by a server with a destination port number of 110, it indicates that the client is requesting the Post Office Protocol version 3 (POP3) service. Port 110 is specifically assigned for POP3, which is a protocol used by email clients to retrieve emails from a mail server. When a client connects to a mail server to download messages, it typically uses this port to communicate using the POP3 protocol. This is crucial for users who need to access their email from different devices, as POP3 allows them to download and manage their emails effectively. Understanding the port numbers associated with various services is essential for network management and troubleshooting. In this case, recognizing that port 110 is designated for POP3 directly leads to the conclusion that the client is requesting email retrieval service.

When a packet is received by a server with a destination port number of 110, it indicates that the client is requesting the Post Office Protocol version 3 (POP3) service. Port 110 is specifically assigned for POP3, which is a protocol used by email clients to retrieve emails from a mail server.

When a client connects to a mail server to download messages, it typically uses this port to communicate using the POP3 protocol. This is crucial for users who need to access their email from different devices, as POP3 allows them to download and manage their emails effectively.

Understanding the port numbers associated with various services is essential for network management and troubleshooting. In this case, recognizing that port 110 is designated for POP3 directly leads to the conclusion that the client is requesting email retrieval service.