Identify When a Packet Capture Is Needed Within the Context of a Performance Issue F5CAB5 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   An application is experiencing timeouts only for remote users connecting over the internet, while local users on the LAN are unaffected. You need to determine whether the issue is on the client side or the server side. Where should you capture packets first?

   • AOn the server-side interface, to see if the server is responding slowly.
   • BOn the server itself, using tcpdump, to check for server resource exhaustion.
   • COn the BIG-IP, on the client-side interface, to see the traffic as it arrives from the internet.
   • DOn a client machine, using Wireshark, to see the traffic from the user's perspective.
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   Users report that a web application is intermittently slow, but the BIG-IP performance graphs show no CPU or memory saturation. The network team suspects packet loss on the WAN. Which action is most appropriate to confirm this suspicion?

   • AReboot the BIG-IP to clear any transient network state that might be causing the slowdown.
   • BRun a packet capture on the BIG-IP virtual server and analyze for TCP retransmissions and duplicate ACKs.
   • CCheck the BIG-IP system log for error messages about network interface failures.
   • DIncrease the BIG-IP connection timeout to allow more time for slow responses.
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   A packet capture shows a high number of TCP retransmissions, but the BIG-IP performance metrics show normal CPU and memory usage. What does this correlation suggest?

   • AThe performance issue is likely due to network-level packet loss, not BIG-IP resource exhaustion
   • BThe BIG-IP is overloaded and causing the retransmissions
   • CThe issue is caused by a misconfigured firewall rule
   • DThe application server is experiencing high CPU usage
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A BIG-IP administrator is troubleshooting a performance issue where users report slow page loads. The BIG-IP performance graphs show normal CPU and memory usage, but the network interface statistics show a high number of dropped packets. What is the most appropriate next step?

   • AInitiate a packet capture on the affected virtual server to see if the drops are due to network congestion or a misconfiguration.
   • BCheck the BIG-IP system log for error messages about the network interface.
   • CReboot the BIG-IP to clear the interface statistics and see if the drops continue.
   • DIncrease the BIG-IP's memory allocation to reduce packet drops.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A packet capture on the BIG-IP shows a high number of TCP retransmissions for a specific client connection. The BIG-IP performance graphs show normal CPU and memory usage. What is the most likely conclusion?

   • AThe client is using a misconfigured TCP stack.
   • BThe server is slow to respond, causing the client to retransmit.
   • CThe BIG-IP is overloaded and dropping packets.
   • DThere is packet loss on the network path between the client and the BIG-IP.
   Reveal Solution Discussion Select an answer first