Identify When Drops Are Occurring F5CAB5 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A BIG-IP administrator is investigating a performance degradation that occurs every day at 2:00 PM. The administrator notices that the 'Interface In Dropped' counter on the external interface spikes at that time, and the 'Current Connections' statistic also spikes. The BIG-IP's CPU and memory usage remain normal. What is the most likely root cause of the performance issue?

   • AA scheduled batch job is causing a spike in inbound traffic, leading to interface congestion and drops.
   • BThe server is experiencing a performance issue and is not responding to requests.
   • CA network device upstream is dropping packets due to a misconfiguration.
   • DThe connection table is reaching its limit, causing new connections to be dropped.
   Reveal Solution Discussion Select an answer first
2. 17foundation · medium

   What is a common cause of connection table drops on a BIG-IP?

   • AThe connection table has reached its maximum capacity
   • BThe DNS server is unreachable
   • CThe network cable is unplugged
   • DThe pool member is down
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   An administrator is troubleshooting a performance issue where clients are experiencing timeouts when connecting to a web application. A tcpdump on the client side shows that the client sends a SYN, but never receives a SYN-ACK. The administrator runs tcpdump on the BIG-IP's client-facing interface and sees the SYN arrive, but no SYN-ACK is sent back. What is the most likely location of the drop?

   • AIn the network between the client and the BIG-IP, because the SYN-ACK is being dropped.
   • BOn the client side, because the client is not sending the SYN correctly.
   • COn the server side, because the server is not responding to the BIG-IP.
   • DOn the BIG-IP itself, because it received the SYN but did not respond.
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   An F5 BIG-IP administrator is troubleshooting a performance issue where clients are experiencing timeouts. A tcpdump on the client side shows SYN packets sent, but no SYN-ACK received. A tcpdump on the BIG-IP's client-facing interface shows the SYN arriving, and the BIG-IP sends a SYN-ACK. However, the client never receives the SYN-ACK. What is the most likely location of the drop?

   • AOn the BIG-IP itself, because it is dropping the SYN-ACK before it leaves the interface.
   • BOn the client side, because the client is not processing the SYN-ACK correctly.
   • COn the server side, because the server is not responding to the BIG-IP.
   • DIn the network between the client and the BIG-IP, because the SYN-ACK is being dropped.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   An administrator is troubleshooting a performance issue where clients are experiencing timeouts. A tcpdump on the client side shows SYN packets sent, but no SYN-ACK received. A tcpdump on the BIG-IP's client-facing interface shows the SYN arriving, and the BIG-IP sends a SYN-ACK. However, the client never receives the SYN-ACK. The administrator also checks the BIG-IP's statistics and sees that the 'Interface Out Dropped' counter on the client-facing interface is increasing. What is the most likely location of the drop?

   • AOn the client side, because the client is not processing the SYN-ACK correctly.
   • BOn the BIG-IP's client-facing interface, because the 'Interface Out Dropped' counter indicates drops on egress.
   • COn the server side, because the server is not responding to the BIG-IP.
   • DIn the network between the client and the BIG-IP, because the SYN-ACK is being dropped.
   Reveal Solution Discussion Select an answer first