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| Section | Weight | Objectives |
|---|---|---|
| Monitoring & Health Checks | 10% | - Monitor types and configuration
|
| BIG-IP System Architecture & Initial Setup | 20% | - Initial configuration and licensing
|
| Troubleshooting & Support | 20% | - Common issues and resolution
|
| Networking & Routing | 15% | - VLANs, self-IPs, and routes
|
| Maintenance & Upgrades | 10% | - Software installation and upgrades
|
| Traffic Management Fundamentals | 25% | - Profiles and persistence
|
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NEW QUESTION # 21
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?
Answer: A
Explanation:
On a BIG-IP system, hardware-related alerts, including those for power supply units (PSUs), fans, and chassis components, are primarily logged in the Local Traffic Manager (LTM) log file.
* Log Location: The file path is /var/log/ltm.
* PSU Alert Messages: When a power supply fails, experiences an outage, or is unplugged, the chmand (Chassis Manager) or system_check processes log specific error codes to this file. For example, you may see messages like 010d0006:0: Chassis power supply <X> has experienced an issue or VINPUT=bad.
* Troubleshooting: Administrators can use the command grep -i "power supply" /var/log/ltm to quickly filter for PSU-related events.
* Other Logs: * /var/log/kern.log typically contains low-level kernel and driver messages.
* /var/log/audit tracks administrative changes and commands executed by users.
* /var/log/daemon.log contains messages from various system background services but is not the primary location for hardware sensor alerts.
NEW QUESTION # 22
A BIG-IP Administrator observes the following pool member status message:
Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status
down
[/Common/http: up, /Common/http2: down; last error:]
Why is this pool member being marked down? (Choose one answer)
Answer: B
Explanation:
The pool member is marked DOWN because it is monitored by multiple health monitors, specifically an HTTP monitor and an HTTP/2 monitor. The status message clearly shows that the HTTP monitor is UP, while the HTTP/2 monitor is DOWN. In BIG-IP, when multiple monitors are assigned to a pool member, the default behavior is AND logic, meaningall assigned monitors must succeed for the pool member to be considered healthy.
In this scenario, the server is responding successfully to standard HTTP (likely HTTP/1.1) requests but does not support or respond correctly to HTTP/2 requests. As a result, the HTTP/2 monitor fails, which causes the overall monitor status to be DOWN, even though HTTP traffic itself is working.
This behavior is expected and documented in BIG-IP monitoring logic. Unless the monitor rule is explicitly changed to"at least one of", a single failing monitor will mark the pool member down.
Therefore, the correct conclusion is that the pool member isonly serving HTTP traffic, not HTTP/2.
The resolution would be to either remove the HTTP/2 monitor, correct the application to support HTTP/2, or adjust the monitor rule to match the intended health-check logic.
NEW QUESTION # 23
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: C
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 # 24
Which command displays current connections?
Answer: B
Explanation:
This shows active connections handled by the system.
NEW QUESTION # 25
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: A
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 # 26
......
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