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| Section | Objectives |
|---|---|
| Diagnostics and Root Cause Analysis | - Log interpretation and troubleshooting methods - Basic BIG-IP diagnostic workflows |
| Network Performance Issue Identification | - Analyzing traffic flow issues - Identifying network-level performance bottlenecks |
| BIG-IP Operations and Support Fundamentals | - System resource utilization analysis - Interpreting system health and statistics |
| Traffic Flow and Load Balancing Troubleshooting | - Load balancing behavior validation - Virtual server and pool troubleshooting |
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NEW QUESTION # 59
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?
Answer: C
Explanation:
When traffic "stabilizes after a few minutes" following a failover, it points to a network-level performance issue involving ARP cache on upstream routers and switches. Each BIG-IP interface has a unique hardware MAC address. During failover, the Standby device takes over the floating IP address, but the upstream switch still associates that IP with the MAC of the now-offline device. Traffic is lost until the switch learns the new MAC or its ARP entry expires. "MAC Masquerading" solves this by creating a shared, virtual MAC address for the floating traffic group.
This virtual MAC is used by whichever device is currently active. Because the MAC address for the virtual server IP never changes from the perspective of the network, the upstream devices do not need to update their ARP tables. This troubleshooting solution eliminates the delay associated with failover, providing a seamless transition and ensuring that application traffic flow is not disrupted when the BIG-IP HA state changes.
NEW QUESTION # 60
A BIG-IP Administrator needs to determine why only one pool member is showing connections from the virtual server, resulting in uneven load balancing.
What two reasons would cause uneven load balancing? (Choose two answers)
Answer: C,D
Explanation:
Uneven load balancing on a BIG-IP system typically occurs when traffic is not distributed evenly across all available pool members. One common reason is that monitors have marked down multiple pool members (Option B). When health monitors fail for specific pool members, BIG-IP automatically removes those members from load-balancing decisions. As a result, traffic is sent only to the remaining healthy member, creating the appearance that load balancing is not functioning correctly. This behavior is expected and aligns with BIG-IP's design to ensure traffic is sent only to healthy resources.
Another frequent cause is the presence of a persistence profile on the pool or virtual server (Option C). Persistence (such as source address or cookie persistence) forces subsequent client connections to be sent to the same pool member for session continuity. While persistence is critical for certain applications, it can override the load-balancing algorithm and cause most or all traffic to be directed to a single pool member, especially during low traffic volumes or testing scenarios.
The other options are incorrect because a virtual server marked down (Option A) would not pass traffic at all, and all pool members marked down (Option D) would result in no connections rather than uneven distribution. This analysis follows standard BIG-IP troubleshooting methodology using pool status, monitor results, and persistence configuration review.
NEW QUESTION # 61
A custom HTTP monitor is failing to a pool member 10.10.3.75:8080 that serves up www.example.com. A ping works to the pool member address. The SEND string is: GET / HTTP/1.1 \r\nHost: www.example.
com\r\nConnection: Close\r\n\r\n. Which CLI tool syntax will show whether the web server returns the correct HTTP response?
Answer: D
Explanation:
To manually verify a health monitor's "Send String" from the BIG-IP command line, the curl utility is the preferred tool because it allows for custom header insertion.
* Matching the Monitor String: The monitor string requires an HTTP/1.1 request which must include a
"Host" header. Option A correctly uses the --header (or -H) flag to pass Host: www.example.com to the specific IP and port of the pool member.
* Troubleshooting Logic: If curl --header 'Host: www.example.com' 'http://10.10.3.75:8080/' returns a
"200 OK" but the BIG-IP monitor still shows "Down," the administrator should check if the Receive String in the monitor configuration matches the output provided by curl.
* Invalid Syntax: Option D is incorrect because it tries to append the hostname to the URI path, which the web server will likely reject with a "404 Not Found". tracepath (Options B and C) is a path discovery tool similar to traceroute and cannot validate HTTP response content.
NEW QUESTION # 62
Without decrypting, what portion of an HTTPS session is visible with a packet capture?
Answer: D
Explanation:
When analyzing HTTPS traffic using tools like tcpdump without access to the SSL private keys for decryption, only the Layer 2 through Layer 4 information remains visible.
* Visible Information: You can see the Source and Destination IP addresses, TCP ports, and the TLS handshake headers (such as the Server Name Indication/SNI in the Client Hello).
* Encrypted Information: Once the encrypted tunnel is established, all Layer 7 data is masked. This includes HTTP Request/Response Headers (Option A and D) and Cookies (Option C).
* Troubleshooting Note: To see the headers or cookies, an administrator must either perform the packet capture on the "server-side" of the BIG-IP (if it is performing SSL Offload) or use a tool like Wireshark with the appropriate SSL keys loaded.
NEW QUESTION # 63
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages.
Which log file should the BIG-IP Administrator check to verify the suspicion? (Choose one answer)
Answer: B
Explanation:
According to official F5 documentation (K52015891 - Troubleshooting BIG-IP power supply issues), hardware-related alerts for power supplies, fans, and chassis components are logged in /var/log/ltm.
When a BIG-IP device experiences a power supply issue-such as failure, intermittent outages, or fan-related faults-the system generates alerts through internal platform monitoring services. These alerts are written to the /var/log/ltm file and often appear with messages similar to:
Chassis power supply 2 has experienced an issue. Status is as follows: FAN=bad; STATUS=bad.
This makes /var/log/ltm the authoritative log file for identifying and verifying power supply and chassis-related problems on BIG-IP systems.
The other log files are not appropriate for this purpose:
/var/log/daemon.log contains general daemon messages but is not the primary source for chassis hardware alerts.
/var/log/kern.log logs kernel-level events, not platform power status.
/var/log/audit records administrative actions and configuration changes.
Conclusion:
Per F5-supported guidance, when suspecting power supply outages or chassis hardware issues, the BIG-IP Administrator should always check /var/log/ltm first.
NEW QUESTION # 64
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