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NEW QUESTION # 20
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: B
Explanation:
When a virtual server's traffic flow is disrupted only during failover events and takes several minutes to stabilize, the issue is typically related to the ARP cache on upstream network devices47. By default, each BIG-IP in an HA pair uses its own unique hardware MAC address for traffic4848. When a failover occurs, the new active device takes over the floating IP addresses, but the upstream switch may still have the MAC address of the old device cached4949. Traffic fails until the switch's ARP entry is updated. "MAC Masquerade" is a troubleshooting feature that assigns a shared, virtual MAC address to the floating traffic group. Regardless of which BIG-IP is currently active, it will use this masqueraded MAC address for all traffic related to that group52. Because the MAC address seen by the network never changes during a failover, the upstream devices do not need to relearn ARP entries, resulting in an instantaneous transition and eliminating the performance drop reported by users
NEW QUESTION # 21
A BIG-IP Administrator observes the following messages in the /var/log/ltm log:
warning tmm[pid]: 011e0002: sweeper_segment_cb_any: Aggressive mode /Common/default-eviction-policy activated (0) (global memory) (345209/690176 pages) warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed What is happening when the BIG-IP Administrator sees the messages displayed above? (Choose two answers)
Answer: A,C
Explanation:
Comprehensive and Detailed 150 to 250 Words Explanation From BIG-IP Administration, Support, and Troubleshooting Documents:
These log messages indicate that the BIG-IP system's Traffic Management Microkernel (TMM) has entered aggressive eviction mode due to high global memory utilization. When TMM memory consumption reaches critical thresholds, BIG-IP activates the default eviction policy to protect system stability and prevent a full traffic processing failure. This condition directly corresponds to Option A, where the global eviction policy is triggered because TMM memory resources are nearing exhaustion.
Once aggressive mode is activated, BIG-IP begins using the connection sweeper mechanism, which selectively terminates existing connections to free memory. The repeated log entries stating "1 connections killed" confirm that the system is reaping some connections, not all connections. This behavior matches Option C. The eviction process is incremental and controlled, targeting idle, low-priority, or least-recently-used connections first to minimize impact on active traffic.
Option B is incorrect because BIG-IP does not drop all connections during aggressive mode; it only removes enough connections to relieve memory pressure. Option D is also incorrect because TMM eviction is based on TMM global memory usage, not swap memory utilization. TMM does not rely on swap space in the same way the host Linux system does.
These messages are a critical warning sign that the system is under memory stress and may require traffic optimization, connection limits, or hardware scaling.
NEW QUESTION # 22
A BIG-IP device sends out the following SNMP trap:
big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN.
Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?
Answer: B
Explanation:
Identifying network-level performance issues often starts with investigating hardware-level alerts.
In F5 terminology, a "Link" like "1.0" or "1.1" refers to a physical interface on the appliance. When an SNMP trap reports that a link is "DOWN," it indicates a loss of signal or an administrative shutdown of the physical port. To verify this, the administrator must navigate to Network > Interfaces > Interface List. This screen provides real-time status, showing whether the interface is
"up," "down," or "uninitialized," as well as any media speed or duplex mismatches that could be causing performance degradation. Troubleshooting this is the first step in resolving "pool member down" or "VLAN failsafe" issues, as a down interface will take down any VLANs associated with it, immediately halting all traffic flow for the services relying on that physical path.
NEW QUESTION # 23
A BIG-IP Administrator is receiving intermittent reports from users that SSL connections to the BIG-IP device are failing. Upon checking the log files, the administrator notices: SSL transaction (TPS) rate limit reached. Reviewing stats shows a max of 1200 client-side SSL TPS and 800 server-side SSL TPS. What is the minimum SSL license limit capacity required to handle this peak?
Answer: A
Explanation:
Troubleshooting SSL connection resets often involves verifying license limits against actual resource utilization. F5 devices use a "Transactions Per Second" (TPS) license to control the amount of SSL processing the device can handle. The log entry SSL transaction (TPS) rate limit reached is a clear indicator that the traffic volume has exceeded the licensed capacity. When determining the necessary license level, it is important to know that F5 primarily licenses and limits the "Client-side" SSL TPS-which represents the encrypted connections between the users and the virtual servers. In this specific scenario, the peak demand reached 1200 client-side transactions per second. Although there were also 800 server-side transactions (re-encryption from the BIG-IP to the pool), these typically do not count against the primary TPS license limit in the same manner. Therefore, to ensure that the virtual server works as expected during peak load, the administrator must upgrade the license to at least 1200 TPS. This troubleshooting process links system log errors to license-enforced resource constraints.
NEW QUESTION # 24
Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status down.
[ /Common/http: up, /Common/http2: down; last error: ] [ was up for
lhr:0min:43sec ]
Why is this pool member being marked down?
Answer: C
Explanation:
This log entry indicates that multiple monitors are assigned to the pool member, and the member is failing one of them.
Understanding Monitor Logic: By default, if multiple monitors are assigned to a pool or pool member without a "Minimum To Up" (Availability Requirement) setting, the system requires all monitors to pass for the member to be marked "Up".
Analyzing the Log: The log clearly states: [ /Common/http: up, /Common/http2: down; ... ]. This means the standard HTTP monitor is successful, indicating the member is serving HTTP traffic, but the http2 monitor has failed.
Conclusion: Since the http monitor is "up" but the member as a whole is "down," we can conclude the member is successfully responding to standard HTTP requests but not HTTP2 requests.
Therefore, the member is currently only serving standard HTTP traffic.
NEW QUESTION # 25
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