GSEC · Question #395
Which of the following is the default port for Simple Network Management Protocol (SNMP)?
The correct answer is A. UDP port 161. SNMP uses UDP port 161 for communication between the SNMP manager and agents on managed network devices.
Question
Which of the following is the default port for Simple Network Management Protocol (SNMP)?
Options
- AUDP port 161
- BTCP port 25
- CTCP port 80
- DTCP port 110
How the community answered
(26 responses)- A77% (20)
- B8% (2)
- C4% (1)
- D12% (3)
Why each option
SNMP uses UDP port 161 for communication between the SNMP manager and agents on managed network devices.
SNMP is defined by RFC 1157 and subsequent RFCs to use UDP as its transport protocol because the lightweight, connectionless nature of UDP suits polling-based network management traffic. Port 161 is the well-known port assigned to SNMP agents for receiving requests from the manager, while port 162 is used for SNMP traps.
TCP port 25 is the well-known port for SMTP (Simple Mail Transfer Protocol), used for sending email, and has no relation to SNMP.
TCP port 80 is the well-known port for HTTP (HyperText Transfer Protocol), used for unencrypted web traffic, and has no relation to SNMP.
TCP port 110 is the well-known port for POP3 (Post Office Protocol version 3), used for retrieving email from a mail server, and has no relation to SNMP.
Concept tested: SNMP default UDP port assignment
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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