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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Networking & Routing | 15% | - VLANs, self-IPs, and routes
|
| Topic 2: Traffic Management Fundamentals | 25% | - Virtual servers, pools, and nodes
|
| Topic 3: BIG-IP System Architecture & Initial Setup | 20% | - Initial configuration and licensing
|
| Topic 4: Troubleshooting & Support | 20% | - Common issues and resolution
|
| Topic 5: Maintenance & Upgrades | 10% | - Software installation and upgrades
|
| Topic 6: Monitoring & Health Checks | 10% | - Monitor types and configuration
|
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NEW QUESTION # 48
Exhibit:
A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.
Refer to the exhibit and the virtual server configuration provided below:
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
persist {
source_addr { default yes }
}
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
}
What is the most likely cause of this behavior?
Answer: B
Explanation:
The primary reason for the uneven traffic distribution is the presence of a Persistence Profile in the virtual server configuration.
* Load Balancing vs. Persistence: While the Round Robin method is designed to distribute new connections sequentially among pool members, Persistence overrides this logic for existing clients.
* Source Address Persistence: The configuration shows source_addr persistence is enabled. This ensures that once a client (identified by their source IP) is mapped to a pool member, all subsequent connections from that same IP will be sent to the same member for the duration of the persistence record.
* Uneven Distribution Logic: If one source IP address generates significantly more connections or longer-lived sessions than others-or if many clients appear behind a single NAT/Proxy IP-that specific pool member (in this case, 172.16.20.3) will receive a disproportionate amount of traffic compared to the others.
* Evaluating Other Options:
* Automap (Option A): SNAT Automap changes the source IP between the BIG-IP and the pool member. It does not impact the BIG-IP's ability to load balance incoming client requests.
* Ratio Settings (Option B): In the provided exhibit, the pool members have a Ratio of 1, 2, and 3 respectively. While a higher ratio does direct more traffic to a member, the question asks for the
"most likely cause" in the context of the provided ltm virtual configuration, which explicitly highlights the persistence override.
* HTTP Profile (Option C): Round Robin is a Layer 4 load balancing algorithm and does not require a Layer 7 HTTP profile to function.
NEW QUESTION # 49
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: C
Explanation:
Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license. 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 TPS. Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.
NEW QUESTION # 50
In the BIG-IP Configuration Utility, a user requests a single screen view to determine the status of all Virtual Servers and associated pool members, as well as any iRules in use. Where should the BIG-IP Administrator instruct the user to find this view?32
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP A41dministration Support and Troubleshooting documents:To confirm functionality across a complex environment, the "Network Map" is the most efficient troubleshooting tool in the Configuration Utility43. It provides a hierarchical, visual representation of the traffic management objects44. A single glance allows the administrator to see the status of a Virtual Server (Green/Red/Yellow), the status of its associated pool, the health of individual pool members, and which iRules are currently attached45. This view is superior to the standard "Virtual Server List" for troubleshooting because it maps the dependencies between objects46. For example, if a Virtual Server is "Red," the Network Map will show if that status is inherited from a failed pool or a specific monitor failing on a pool member.
Reviewing these basic stats in the Network Map helps the administrator quickly isolate whether a failure is at the service level (Virtual Server), the logic level (iRule), or the hardware level (Pool Member).
NEW QUESTION # 51
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: D
Explanation:
The BIG-IP system uses the audit log to track administrative actions and configuration changes.
Audit Logging Functionality: When a user modifies the configuration via the Configuration Utility (GUI), the Traffic Management Shell (tmsh), or iControl, the system records the event in the audit log. This includes the name of the user who made the change, the timestamp, and the specific command or object that was modified.
Log Location: The audit log is stored at /var/log/audit.
Evaluation of Other Options:
/var/log/messages (Option A) contains general system and kernel messages but is not the primary source for configuration change details.
/var/log/secure (Option B) primarily logs authentication and authorization attempts (logins and logouts).
/var/log/user.log (Option D) is a generic Linux log file for user-level applications and does not track BIG-IP LTM configuration changes.
NEW QUESTION # 52
Refer to the exhibit. A pool member fails the monitor checks for about 30 minutes and then starts passing the monitor checks. New traffic is NOT being sent to the pool member. What is the likely reason for this problem? (Choose one answer)
Answer: A
Explanation:
In BIG-IP LTM, health monitors are used to determine if a pool member or node is "Up" and capable of processing traffic. Based on the provided exhibit, the specific configuration setting causing this behavior is Manual Resume.
Manual Resume (Enabled/Yes): When the Manual Resume setting is set to Yes, it changes the default behavior of how a pool member returns to service. Under normal circumstances (Manual Resume set to No), once a pool member starts passing its health check again, the BIG-IP system automatically marks it as "Up" and resumes sending traffic to it. However, with Manual Resume enabled, the system will continue to mark the pool member as "Down" (or "Unavailable") even after it passes the health check. It requires a manual intervention by an administrator to reset the status and allow traffic to flow again.
Exhibit Analysis: The screenshot clearly shows the Manual Resume radio button is selected as Yes. This explains why, even after the pool member "starts passing the monitor checks," it does not receive new traffic.
NEW QUESTION # 53
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