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NEW QUESTION # 72
Which two methods should the BIG-IP Administrator use to troubleshoot a pool member that has been marked DOWN by its health monitor? (Choose two answers)
Answer: C,D
Explanation:
When a pool member is marked DOWN, it indicates that the configured health monitor is failing. The most effective troubleshooting approach is to focus on the monitor behavior and the actual traffic between BIG-IP and the pool member.
Enabling monitor logging (Option B) is a recommended first step. Monitor logging provides detailed information about why the health check is failing, such as timeouts, connection refusals, incorrect responses, or unexpected status codes. This directly correlates with BIG-IP troubleshooting best practices and allows administrators to confirm whether the failure is due to application behavior, incorrect monitor configuration, or network reachability.
Collecting a TCPdump packet capture (Option D) is also a highly effective method. A packet capture allows the administrator to verify whether the monitor probes are being sent, whether responses are received, and whether packets are being dropped, reset, or malformed. This is especially valuable when diagnosing firewall issues, SSL problems, or application-level failures.
Reviewing pool statistics (Option C) is useful for general monitoring but does not explain why a health monitor is failing. Reviewing the routing table (Option A) is typically unnecessary unless there is evidence of a broader routing issue affecting multiple destinations.
NEW QUESTION # 73
Refer to the exhibit.
An LTM device has a virtual server mapped to www.f5.com . Users report that when they connect to www.f5.com they are unable to receive content. What is the likely cause of the issue? (Choose one answer)
Answer: B
Explanation:
Based on the configuration screens provided in the exhibit, the primary reason for the connectivity failure is the disabled ARP setting on the Virtual Address.
Virtual Address ARP Setting: In a standard BIG-IP deployment, the Address Resolution Protocol (ARP) must be enabled for the Virtual Address (192.168.238.111 in this case). When enabled, the BIG-IP system responds to ARP requests from the local network gateway or adjacent devices for that specific IP address.
Exhibit Analysis: Looking at the "Virtual Address List >> 192.168.238.111" properties section, the ARP checkbox is unselected (unchecked). Because ARP is disabled, the upstream router or client cannot resolve the MAC address for 192.168.238.111, and the traffic never reaches the BIG-IP LTM.
Availability Indicators: Note the yellow circle (status indicator) on both the Virtual Server and the Pool Members. In F5 BIG-IP, a yellow status typically indicates that the object is "Available" (Enabled) but its monitors are not currently identifying it as "Up" (which would be a green circle), or it is in a "Monitor Unknown" state. However, even if a pool is available, the traffic must first reach the Virtual Server, which is prevented here by the lack of ARP.
Incorrect Options Analysis:
Priority Group Activation (A): The exhibit shows this is "Disabled". While this affects how load balancing picks members between groups, it does not prevent all content from being received; the system would simply use all members in the pool.
Route Advertising (C): While "Route Advertisement" is also unchecked, this is generally only required if the BIG-IP needs to dynamically propagate the Virtual Address route via protocols like BGP or OSPF. For local segment connectivity, ARP is the fundamental requirement.
NEW QUESTION # 74
Refer to Exhibit. An organization is reporting slow performance accessing their Intranet website, hosted in a public cloud. All employees use a single Proxy Server with the public IP of
104.219.110.168 to connect to the Internet. What should the BIG-IP Administrator of the Intranet website do to fix this issue?
Answer: D
Explanation:
This scenario describes a classic network performance issue known as the "Mega-Proxy" problem. When an organization routes all employee traffic through a single proxy server, the BIG- IP sees thousands of unique users as having the exact same source IP address. If the administrator has configured "Source Address Affinity" persistence, the BIG-IP will correctly follow the rule but incorrectly route all users to the same single backend pool member. This creates a severe load imbalance where one server is overwhelmed while others remain idle, leading to poor application response times. To resolve this, the administrator must change the persistence profile to "HTTP Cookie". Cookie-based persistence allows the BIG-IP to place a unique identifier in each user's browser, allowing the system to distinguish between individual sessions even if they share the same source IP. This fix ensures that traffic is distributed evenly across the pool members, restoring the expected load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.
NEW QUESTION # 75
A BIG-IP Administrator receives 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. stats show a maximum of 1200 client-side SSL TPS and 800 server-side SSL TPS. What is the minimum SSL license limit required to handle this peak?
Answer: D
Explanation:
Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license8888. The log message SSL transaction (TPS) rate limit reached indicates the BIG-IP is dropping SSL connections because it has exceeded its licensed "Transactions Per Second" capacity. When analyzing stats to determine the correct license level, the administrator must focus on "Client-side" SSL TPS. This represents the initial encrypted handshakes between users and the BIG-IP virtual servers91. In this scenario, the peak client-side demand is 1200 TPS. While the 800 server-side transactions represent re-encryption toward the backend, F5's primary SSL TPS license limits typically apply to the client-facing side of the traffic flow.
Therefore, to resolve the intermittent connectivity issues and ensure the virtual server works reliably during peaks, the license must be upgraded to at least 1200 TPS949596969696.9798Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.
NEW QUESTION # 76
A BIG-IP Administrator adds new Pool Members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users. What pool level setting should the BIG-IP Administrator check?
Answer: A
Explanation:
When troubleshooting a pool that is not working correctly after adding new members, the "Slow Ramp Time" setting is a primary suspect. In a pool that is already under high load and using a "Least Connections" load balancing method, a newly added server has zero connections. Without a slow ramp time, the BIG-IP will immediately direct a massive flood of new connections to the new server to "balance" it with the others. This "thundering herd" effect can crash a newly initialized application server before it has time to warm up its caches or establish its own database connections. By setting a "Slow Ramp Time" (typically in seconds), the administrator ensures the BIG-IP gradually increases the connection ratio to the new member. This allows the server to stabilize and scale up its performance over time. If users report intermittent failures specifically coinciding with the expansion of a pool, checking this setting is a vital troubleshooting step to maintain pool health during maintenance.
NEW QUESTION # 77
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