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An ecommerce company is experiencing latency issues with online shops during Black Friday's peak season.
The BIG-IP Administrator detects an overall high CPU load on the BIG-IP device and wants to move the top utilized Virtual Servers to a dedicated BIG-IP device. Where should the BIG-IP Administrator determine the problematic Virtual Servers? (Choose one answer)
A. Statistics > Module Statistics > Local Traffic > Virtual Servers
B. Local Traffic > Network Map
C. System > Platform
D. Local Traffic > Virtual Servers > Virtual Server List
答案：A
解題說明：
When troubleshooting performance and latency issues on BIG-IP, especially under peak load conditions, it is critical to identify which Virtual Servers are consuming the most resources. This is a core data plane analysis task.
BIG-IP provides multiple views of configuration and status, but only certain areas expose real-time and historical traffic statistics that correlate directly with CPU usage and throughput.
Why Option C Is Correct:
Statistics > Module Statistics > Local Traffic > Virtual Servers provides:
* Real-time and cumulative statistics per Virtual Server
* Metrics such as:
* Bits in / Bits out
* Packets in / Packets out
* Current connections
* Connection rate
* Total requests
* The ability to identify high-traffic or high-connection Virtual Servers, which are the most likely contributors to elevated CPU utilization These statistics allow the administrator to objectively determine which Virtual Servers are the top consumers of system resources and therefore good candidates for migration to a dedicated BIG-IP device.
Why the Other Options Are Incorrect:
* A. Local Traffic > Virtual Servers > Virtual Server List
* Primarily a configuration view
* Does not provide sufficient performance or utilization statistics to identify CPU-heavy Virtual Servers
* B. System > Platform
* Displays hardware-level information such as CPU cores, memory, disk, and platform type
* Does not break down utilization by Virtual Server
* D. Local Traffic > Network Map
* Provides a logical topology view of Virtual Servers, pools, and pool members
* Useful for understanding relationships, but not for identifying high-utilization Virtual Servers Key Data Plane Concept Reinforced:
To diagnose performance problems and plan traffic redistribution, BIG-IP administrators must rely on Module and object-level statistics, not configuration screens. The Virtual Server statistics view is the authoritative location for identifying traffic hotspots that directly impact CPU and latency during peak events such as Black Friday.
問題 #24
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)
A. Service port # Destination host address # Source host address
B. Destination host address # Source host address # Service port
C. Source host address # Service port # Destination host address
答案：B
解題說明：
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version
11.3.0, the system evaluates three primary factors in a fixed order of importance:
* Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a
"Wildcard" (0.0.0.0/0).
* Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
* Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.
問題 #25
A BIG-IP Administrator assigns the default HTTP health monitor to a pool that has three members listening on port 80. When the administrator connects to each pool member using the curl utility, two of the members respond with a status of 404 Not Found, while the third responds with 200 OK. What will the pool show for member availability? (Choose one answer)
A. All members offline
B. All members online
C. Two members offline and one member online
D. Two members online and one member offline
答案：C
解題說明：
In BIG-IP LTM, health monitors are used to determine the availability of pool members and directly influence traffic flow decisions in the data plane.
Key characteristics of the default HTTP monitor according to BIG-IP Administration Data Plane Concepts:
* Sends an HTTP request (typically GET /)
* Expects an HTTP response code of 200 OK
* Any response other than 200 is treated as a monitor failure
* A failed monitor causes the pool member to be marked offline (down)
In this scenario:
* Two pool members return 404 Not Found
* A 404 response indicates that the requested object was not found
* This does not meet the success criteria of the default HTTP monitor
* These two members are therefore marked offline
* One pool member returns 200 OK
* This matches the expected response
* The member is marked online
Resulting Pool Member Availability:
* 2 members: Offline
* 1 member: Online
Why the Other Options Are Incorrect:
* B - 404 responses are not considered healthy by the default HTTP monitor
* C - At least one member responds with the expected 200 OK
* D - Members returning 404 responses fail the monitor and cannot be marked online Key Data Plane Concept Reinforced:
BIG-IP health monitors make binary availability decisions based strictly on configured success criteria. For HTTP monitors, response codes matter-404 is a failure, even if the service is technically reachable.
問題 #26
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?
A. Synching should not be performed.
B. This is not possible since both systems are updated simultaneously.
C. The older system will issue SNMP traps indicating a communication error with the partner.
D. The first system to be updated will assume the Active role.
答案：A
解題說明：
The F5 BIG-IP upgrade process for HA pairs requires a specific "staggered" approach to maintain uptime.
* Version Mismatch: When one unit is upgraded to a newer version of TMOS (e.g., from 15.1 to 16.1), it enters a26 "Version Mismatch" 27state with its peer.
* Configuration Sync: Because the configuration schemas between different versions are often incompatible, ConfigSync should not be performed. Attempting to sync a newer configuration to an older system (or vice-versa) can cause configuration corruption or system instability.
* Failover Capability: Generally, a pair with a version mismatch can still fail over to ensure traffic continuity during the upgrade window, but administrative changes and syncs must be paused until both units are on the same version.
問題 #27
Which statement is true concerning iRule events?
A. All client traffic has data that could be used to trigger iRule events.
B. All iRule events relate to HTTP processes.
C. All iRule events are appropriate at any point in the clientserver communication.
D. If an iRule references an event that doesn't occur during the client's communication, the client's connection will be terminated prematurely.