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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting and Support | 25% | - Performance and resource monitoring - Common troubleshooting scenarios - iRules debugging - Logging and log configuration - SNMP and monitoring - tcpdump and network capture |
| Initial Setup and Configuration | 20% | - Initial provisioning (Provisioning, License) - Network failover setup - User management and role-based access - NTP and DNS configuration - Network configuration (VLANs, Self IPs, Routes) |
| Local Traffic Management (LTM) | 30% | - Load balancing modes - Virtual servers (Standard, Performance L4, Forwarding) - SSL profiles and offloading - Pools and pool members - iRules and persistence profiles - Health monitors and monitory types |
| Security and Access | 10% | - Packet filtering - User authentication (Remote Auth, LDAP, RADIUS) - Role-based access control (RBAC) - SSL/TLS configuration |
| Architecture and Components | 15% | - Traffic flow and packet processing - High availability (HA) configurations - Device service clustering (DSC) - BIG-IP system architecture |
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問題 #73
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?
答案：A
解題說明：
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.
問題 #74
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?
答案：C
解題說明：
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.
問題 #75
A BIG-IP Administrator notices that one of the servers that runs an application is NOT receiving any traffic. The BIG-IP Administrator examines the configuration status of the application and observes the displayed monitor configuration and affected pool member status.
What is the possible cause of this issue? (Choose one answer)
答案：D
解題說明：
The key clue in the exhibit is the pool member's availability showing "Offline (Enabled) - Parent down". In BIG-IP terminology, a pool member inherits the status of its parent node. If the node is marked down (for example, by a node-level monitor or a default "node is down" condition), then all pool members using that node IP will also be marked down and will not receive any traffic, even if the application service on the member port might be healthy.
While the HTTPS monitor configuration (send/receive strings) is displayed, the status specifically indicates a node (parent) failure, not a service-level failure. If the problem were the application not matching the receive string, you would typically see the member down due to the member's monitor failing (and the status would reflect monitor failure details), rather than "parent down." Option D is too broad; BIG-IP can generally reach the subnet (other servers work), and this symptom points to a specific node condition. Option C is incorrect because HTTP/1.1 is commonly used for monitoring and is valid when properly formatted (especially with a Host header). Therefore, the most likely cause is that the node health monitor is not responding, causing the node-and consequently the member-to be marked down.
問題 #76
Refer to the exhibit.
A BIG-IP Administrator needs to deploy an application on the BIG-IP system to perform SSL offload and re-encrypt the traffic to pool members. During testing, users are unable to connect to the application.
What must the BIG-IP Administrator do to resolve the issue? (Choose one answer)
答案：C
解題說明：
To successfully perform SSL offload and re-encryption on a BIG-IP system, the virtual server must be configured with both a Client SSL profile and a Server SSL profile. The Client SSL profile enables BIG-IP to decrypt inbound HTTPS traffic from clients, while the Server SSL profile is required to re-encrypt traffic before forwarding it to the pool members.
From the exhibit, the virtual server has a Client SSL profile configured, which allows BIG-IP to accept HTTPS connections from clients. However, there is no Server SSL profile attached, meaning BIG-IP attempts to send unencrypted HTTP traffic to pool members listening on HTTPS (port 443). This protocol mismatch causes the server-side SSL handshake to fail, resulting in users being unable to connect to the application.
This behavior is well documented in BIG-IP SSL troubleshooting guides: when backend servers expect HTTPS, a Server SSL profile is mandatory to establish a secure connection from BIG-IP to the pool members.
The other options are incorrect:
Removing the Client SSL profile (Option A) would break client-side HTTPS.
The server-side TCP profile (Option B) is unrelated to SSL encryption.
Forward Proxy (Option C) is only used for outbound SSL inspection scenarios.
Therefore, configuring an SSL Profile (Server) is the correct and required solution.
問題 #77
Which file should the BIG-IP Administrator check to determine when a Virtual Server changed its status from RED to GREEN?
答案：C
解題說明：
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.
問題 #78
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