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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Local Traffic Management (LTM) | 30% | - Load balancing modes - Virtual servers (Standard, Performance L4, Forwarding) - SSL profiles and offloading - iRules and persistence profiles - Pools and pool members - Health monitors and monitory types |
| Topic 2: Troubleshooting and Support | 25% | - Common troubleshooting scenarios - Logging and log configuration - SNMP and monitoring - iRules debugging - tcpdump and network capture - Performance and resource monitoring |
| Topic 3: Initial Setup and Configuration | 20% | - User management and role-based access - Network failover setup - Initial provisioning (Provisioning, License) - NTP and DNS configuration - Network configuration (VLANs, Self IPs, Routes) |
| Topic 4: Architecture and Components | 15% | - High availability (HA) configurations - Device service clustering (DSC) - BIG-IP system architecture - Traffic flow and packet processing |
| Topic 5: Security and Access | 10% | - Role-based access control (RBAC) - SSL/TLS configuration - Packet filtering - User authentication (Remote Auth, LDAP, RADIUS) |
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NEW QUESTION # 21
A traffic group includes four devices. The failover method is HA order. The failover order is:
* BIGIP-D
* BIGIP-B
* BIGIP-C
* BIGIP-A
Auto fallback is enabled. BIGIP-D has been forced to standby. BIGIP-B was active before being rebooted.
Which device is active when BIGIP-B is up after the reboot?
Answer: B
Explanation:
To understand which device becomes active, we must look at how the BIG-IP system handles HA Order and Auto Fallback within a traffic group.
* HA Order Mechanism: When a traffic group is configured with an "HA Order" list, the system prefers to host the traffic group on the highest-ranking available device in that list (1 being the highest).
* The Impact of "Forced to Standby": BIGIP-D is the first choice in the order, but it has been "Forced to Standby." This state is persistent and manual; until an administrator releases the "Force to Standby" state, the device is ineligible to host the traffic group, effectively removing it from the top of the preference list.
* Auto Fallback: When "Auto Fallback" is enabled, the traffic group will automatically migrate back to a higher-priority device in the HA order as soon as that device becomes available and is in a healthy
"Standby" state.
* The Scenario Logic: 1. BIGIP-D is ineligible (Forced Offline/Standby).
2. BIGIP-B is the next highest device in the HA Order (Rank 2).
3. While BIGIP-B was rebooting, the traffic group would have failed over to BIGIP-C (Rank 3).
4. Once BIGIP-B finishes booting and joins the cluster in a "Standby" state, the Auto Fallback setting triggers.
5. Because BIGIP-B is higher in the HA Order than the current active device (BIGIP-C) and the only device above it (BIGIP-D) is ineligible, the traffic group fails back to BIGIP-B.
NEW QUESTION # 22
A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: In F5 TMOS administration, the traffic flow is processed through specific event huddles w3ithin iRules. To troubleshoot or m4odify traffic based on a URI (Uniform Resource Identifier), the BIG-IP system must first parse the application-layer data. The HTTP_REQUEST event is triggered when the system has fully received and parsed the HTTP request headers from the client5. This is the correct point to implement logic that selects a pool or pool member based on the path or file requested (e.g., /images or /api). Using CLIENT_ACCEPTED would be too early in the troubleshooting process because that event triggers at the L4 (TCP) connection establishment phase, before any URI information is available6. Conversely, HTTP_RESPONSE occurs during the return traffic from the server, which is too late to make a load balancing decision7. For troubleshooting virtual server behavior where URIs are involved, ensuring the iRule is attached to a Virtual Server with an HTTP profile and using the HTTP_REQUEST event is essential for proper traffic steering and inspection.
NEW QUESTION # 23
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration S73upport and Troubleshooting documents: Persistence is critical for ensuring that a client's session remains with the same pool member throughout its duration. If primary persistence (like Cookie Persistence) fails-for instance, because the client has disabled cookies-load balancing will not work as expected, and the session may be broken. A "Fallback Persistence Profile" provides a backup method75. The most common and reliable fallback method is "Source Address Affinity"76. This method tracks the client's IP address in the BIG-IP's persistence table and ensures that any subsequent requests from that IP are routed to the same pool member, even if the primary persistence token is missing. Troubleshooting session drops often involves checking if a fallback method is configured to handle scenarios where the primary method is unsupported by the client's browser or environment. Without a fallback, the BIG-IP would revert to standard load balancing, potentially sending the client to a different server that lacks their session data.
NEW QUESTION # 24
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status from RED to GREEN?
Answer: D
Explanation:
Status changes for local traffic objects (Virtual Servers, Pools, Nodes) are recorded in the Local Traffic Manager (LTM) log.
Health State Logging: When a health monitor marks a resource as available (Green) or unavailable (Red), the system generates a log message in /var/log/ltm.
Log Entry Example: A transition from Red to Green will appear as a message similar to: 01010027:3: Pool /Common/my_pool member /Common/10.0.0.1:80 monitor status up.
Evaluation of Other Options:
/var/log/audit (Option A) logs who changed a configuration, not automated state changes from health monitors.
/var/log/lastlog (Option C) is a standard Linux file that tracks the last login time of users.
/var/log/monitors (Option D) is not a standard log file on the BIG-IP system.
NEW QUESTION # 25
A set of servers is used for an FTP application as well as an HTTP website via separate BIG-IP Pools. The server support team reports that some servers are receiving a lot more traffic than others. Which Load Balancing Method should the BIG-IP Administrator apply to even out the connection count?
Answer: A
Explanation:
When load balancing is not working as expected across hardware hosting multiple services, the administrator must distinguish between "member" and "node" level algorithms102102102102. A "member" is a specific IP and port (e.g., 10.1.1.1:80), while a "node" is the physical server's IP (10.1.1.1) regardless of the port103. If servers host both FTP and HTTP services in separate pools, using "Least Connections (Member)" only balances connections within each individual pool. This can lead to a skewed distribution where one server is selected for a new HTTP connection because it has the fewest HTTP connections, even if it is currently overloaded with hundreds of FTP connections. By applying "Least Connections (Node)," the BIG-IP tracks the total number of connections to the physical hardware across all ports and pools106106106106. This ensures that the administrator can maintain an even distribution of the total workload across the server fleet, resolving the reports of uneven traffic distribution reported by the server support team
NEW QUESTION # 26
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