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Difficulty: EasyNetworking Ports and Protocols

Match each network protocol on the left with its standard port number and primary function on the right.

  • SMTPPort 25 - Sending and relaying outbound email messages
  • POP3Port 110 - Downloading email messages to a local client
  • IMAPPort 143 - Managing and syncing email folders on a mail server
  • SNMPPort 161 - Collecting diagnostics and managing network devices

Answer

SMTP corresponds to Port 25 (sending email), POP3 corresponds to Port 110 (local email retrieval), IMAP corresponds to Port 143 (server-based email management), and SNMP corresponds to Port 161 (network device monitoring).
SMTP connects over port 25 for sending mail, POP3 retrieves mail over port 110 by downloading it to the endpoint, IMAP allows interactive folder management on port 143, and SNMP monitors network devices on port 161.

Step-by-Step Solution

1
Identify the primary mail transfer protocol used for sending messages.
SMTP uses TCP port 25 for sending and relaying emails.
SMTP is designated specifically for outbound message transport.
2
Differentiate local email download from server-synced email management.
POP3 uses TCP port 110 to download messages locally, while IMAP uses TCP port 143 to keep messages stored and synchronized on the server.
POP3 downloads and typically deletes messages from the server, whereas IMAP maintains two-way folder synchronization.
3
Identify the protocol used for network management and performance monitoring.
SNMP uses UDP port 161 for querying hardware statistics and system status.
SNMP agents listen on UDP port 161 to process queries sent by network management stations.

Key Concept

Standard Network Port Assignments and Protocol Functions
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Topics

Networking Ports and Protocols

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