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Difficulty: MediumCommon Ports and Protocols

An engineer is mapping network service traffic for perimeter security monitoring. Match each network protocol on the left with its standard default port number and transport layer protocol on the right.

  • Server Message Block (SMB)Port 445 / TCP
  • Internet Message Access Protocol (IMAP)Port 143 / TCP
  • SNMP Trap notificationsPort 162 / UDP
  • Network Time Protocol (NTP)Port 123 / UDP

Answer

Server Message Block (SMB) matches Port 445 / TCP; Internet Message Access Protocol (IMAP) matches Port 143 / TCP; SNMP Trap notifications match Port 162 / UDP; Network Time Protocol (NTP) matches Port 123 / UDP.
Each protocol is accurately matched to its assigned IANA default port number and transport layer protocol: SMB uses TCP port 445, IMAP uses TCP port 143, SNMP traps use UDP port 162, and NTP uses UDP port 123.

Step-by-Step Solution

1
Identify transport requirements for connection-oriented file sharing and email retrieval protocols.
SMB requires reliable TCP transmission over port 445, and standard IMAP requires TCP over port 143.
File transfers and email access require connection-oriented transport guarantees provided by TCP.
2
Identify transport requirements for time synchronization and asynchronous trap alert protocols.
NTP uses lightweight connectionless UDP port 123, and SNMP Traps use UDP port 162 to deliver event messages to management systems.
Time synchronization and automated agent traps rely on low-overhead UDP transport.

Key Concept

Standard default port numbers and transport layer protocols (TCP/UDP) for enterprise networking services.
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Topics

Common Ports and Protocols

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