UDP ports 161/162 are used by which protocol?

UDP ports 161/162 are used by which protocol?

• A. Trivial File Transfer Protocol (TFTP)
• B. Internet Message Access Protocol (IMAP)
• C. Simple Network Management Protocol (SNMP)
• D. Dynamic Host Configuration Protocol (DHCP)

Answer: (C)

UDP ports 161 and 162 are assigned to Simple Network Management Protocol. SNMP runs over UDP because it’s designed to be lightweight for monitoring, without needing the reliability guarantees of a TCP connection. The device’s SNMP agent listens on port 161 for requests from managers, and when something happens, it can send a trap (notification) to the manager on port 162. The other options don’t use these ports or protocols: TFTP uses UDP port 69, IMAP uses TCP ports 143 (or 993 for IMAPS), and DHCP uses UDP ports 67 and 68 for server/client communications.

UDP ports 161 and 162 are assigned to Simple Network Management Protocol. SNMP runs over UDP because it’s designed to be lightweight for monitoring, without needing the reliability guarantees of a TCP connection. The device’s SNMP agent listens on port 161 for requests from managers, and when something happens, it can send a trap (notification) to the manager on port 162. The other options don’t use these ports or protocols: TFTP uses UDP port 69, IMAP uses TCP ports 143 (or 993 for IMAPS), and DHCP uses UDP ports 67 and 68 for server/client communications.