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| Section | Weight | Objectives |
|---|---|---|
| BIG-IP System Architecture & Initial Setup | 20% | - Platform and hardware components
|
| Monitoring & Health Checks | 10% | - Monitor types and configuration
|
| Networking & Routing | 15% | - VLANs, self-IPs, and routes
|
| Troubleshooting & Support | 20% | - Common issues and resolution
|
| Maintenance & Upgrades | 10% | - Software installation and upgrades
|
| Traffic Management Fundamentals | 25% | - Virtual servers, pools, and nodes
|
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NEW QUESTION # 24
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: D
Explanation:
When adding new members to an active, high-traffic pool, the Slow Ramp Time setting is critical for maintaining application stability.
* Mechanism: The Slow Ramp Time feature (located in the Pool properties) allows the BIG-IP system to gradually increase the number of connection requests sent to a newly added or recently enabled pool member.
* The Issue: In a highly utilized pool, if Slow Ramp Time is set to 0 (the default), the BIG-IP immediately begins sending a proportional share of traffic to the new members. If the application requires a "warm-up" period (e.g., to build local caches or establish database connection pools), the sudden influx of traffic can overwhelm the new server, causing it to drop requests or fail to load content for users.
* Recommendation: F5 recommends setting a non-zero Slow Ramp Time (measured in seconds) to allow the new member to scale up its processing capacity incrementally.
NEW QUESTION # 25
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: A
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.
NEW QUESTION # 26
A BIG-IP Administrator is informed that traffic on Interface 1.1 is expected to increase over the maximum bandwidth capacity on the link. There is a single VLAN on the Interface. What should the BIG-IP Administrator do to increase the total available bandwidth?
Answer: A
Explanation:
When a physical network link (like Interface 1.1) reaches its maximum capacity, it creates a bottleneck that negatively impacts network-level performance. To overcome the physical limits of a single interface, BIG-IP administrators use "Trunking," which is the F5 term for Link Aggregation (often implemented via LACP). A trunk object bundles multiple physical interfaces into a single logical link. By creating a trunk with two or more interfaces, the BIG-IP can spread the traffic load across all members of the trunk, effectively doubling or tripling the available bandwidth for the associated VLANs. Beyond performance, troubleshooting redundancy often leads to the use of trunks; if one cable in a trunk fails, the others continue to carry traffic, preventing a complete outage. This is a superior solution to simply increasing MTU (which requires end-to-end support) or manually setting media speeds. In a high-availability environment, configuring trunks is a foundational troubleshooting and optimization step to ensure that traffic spikes do not result in packet loss due to link saturation.
NEW QUESTION # 27
A device group is currently in the Changes Pending sync status. How can the BIG-IP Administrator determine which member of the device group has the most recent configuration? (Choose one answer)
Answer: B
Explanation:
When a BIG-IP device group shows a Changes Pending status, it indicates that one or more devices in the group have configuration changes that have not yet been synchronized to the other members. To identify which device has the most recent (authoritative) configuration, the administrator must view the detailed synchronization status at the device group level.
The correct location is Device Management > Device Groups (Option D). Within this menu, the BIG-IP Configuration Utility displays each device group along with its synchronization status and provides details about which device has pending changes. From this view, the administrator can clearly see which device is marked as having changes pending, making it the source device that should be used to initiate a Sync to Group operation.
The other options do not provide the required level of detail:
Device Management > Overview (Option A) shows general HA status but not configuration ownership.
Device Management > Devices (Option B) lists devices but does not clearly identify which one holds unsynchronized changes.
System > High Availability (Option C) focuses on failover and traffic groups, not configuration sync state.
This workflow aligns with BIG-IP best practices for configuration synchronization and ensures changes are propagated correctly without overwriting newer configurations.
NEW QUESTION # 28
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 # 29
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