Question

A network engineer configures a router with 'snmp-server community NOCread RO 15' so the monitoring platform can poll interface counters. After the change, the NMS at 10.20.5.40 times out on every SNMP GET, while the engineer can successfully query the router from a jump host at 10.20.9.10. Access-list 15 contains a single line: 'permit 10.20.9.0 0.0.0.255'. What is the most likely cause of the NMS polling failure?

Accepted Answer

Access-list 15 permits only the 10.20.9.0/24 subnet, so SNMP requests from 10.20.5.40 are denied by the community's applied ACL.

Answer

The read-only community requires 'RW' access for interface counter polling to succeed.

Answer

SNMPv2c requires an engine ID to be configured before any GET requests can be answered.

Answer

The community string must be at least 12 characters, so 'NOCread' is rejected by the SNMP process.