Interpret Traffic Graphs (Interpret SNMP Results) F5CAB5 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   An administrator is investigating a security incident. SNMP graphs show that 'ltmVirtualServStatClientPktsIn' spiked dramatically for 10 minutes, then returned to normal. During the spike, 'ltmVirtualServStatClientBytesIn' also increased, but not proportionally. The graph for 'ltmVirtualServStatClientCurConns' shows a sharp increase during the same period. What is the most likely explanation?

   • AA SYN flood attack was launched against the virtual server.
   • BA pool member failed, causing the BIG-IP to retry connections.
   • CThe BIG-IP was performing a software update.
   • DA legitimate flash crowd of users accessed the application simultaneously.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   An SNMP graph shows a sharp increase in the error counter on a BIG-IP interface at the same time users report intermittent connectivity. What is the most appropriate first troubleshooting step?

   • AReboot the BIG-IP device to clear the error counters
   • BDisable SNMP on the interface to stop the error alerts
   • CIncrease the SNMP polling interval to reduce the number of errors reported
   • DCheck the interface statistics and system logs for physical layer errors or duplex mismatches
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   In an SNMP-managed network, what is the role of the SNMP manager?

   • AIt is the central software that sends queries to and receives traps from agents on managed devices
   • BIt runs on the managed device and collects local statistics
   • CIt provides the physical interface for connecting to the network
   • DIt forwards SNMP traps to other devices without processing them
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the function of a MIB (Management Information Base) in SNMP data collection?

   • AIt is a database that stores historical traffic logs for long-term analysis
   • BIt is a tool that converts SNMP traps into human-readable alerts
   • CIt is a protocol used to transport SNMP messages securely over the network
   • DIt is a structured collection of managed objects that defines the data an SNMP agent can expose
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A BIG-IP administrator is troubleshooting intermittent application timeouts. SNMP graphs show that 'ltmPoolStatPktsIn' and 'ltmPoolStatPktsOut' on the pool spike simultaneously every 5 minutes, but 'ltmVirtualServStatClientPktsIn' remains steady. The TMM CPU graph shows a corresponding spike. What is the most likely cause?

   • AA monitoring system is sending health checks to the pool members every 5 minutes.
   • BThe pool members are sending keepalive messages to the BIG-IP every 5 minutes.
   • CThe BIG-IP is performing a configuration sync with another device every 5 minutes.
   • DClients are experiencing packet loss and retransmitting their requests every 5 minutes.
   Reveal Solution Discussion Select an answer first