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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Initial Setup and Configuration | 20% | - Network configuration (VLANs, Self IPs, Routes) - NTP and DNS configuration - User management and role-based access - Network failover setup - Initial provisioning (Provisioning, License) |
| Topic 2: Architecture and Components | 15% | - Device service clustering (DSC) - High availability (HA) configurations - BIG-IP system architecture - Traffic flow and packet processing |
| Topic 3: Troubleshooting and Support | 25% | - Common troubleshooting scenarios - tcpdump and network capture - iRules debugging - SNMP and monitoring - Performance and resource monitoring - Logging and log configuration |
| Topic 4: Security and Access | 10% | - Packet filtering - Role-based access control (RBAC) - SSL/TLS configuration - User authentication (Remote Auth, LDAP, RADIUS) |
| Topic 5: Local Traffic Management (LTM) | 30% | - Load balancing modes - iRules and persistence profiles - SSL profiles and offloading - Health monitors and monitory types - Pools and pool members - Virtual servers (Standard, Performance L4, Forwarding) |
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18. Frage
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system. Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
Antwort: B
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds62. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle63. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached64. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is "busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error65. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a "Connection Limit" focuses on the total volume66. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
19. Frage
When using the "Manual Resume" feature in BIG-IP, what state will a pool member remain in after a health monitor failure, even if health checks begin to pass again?
Antwort: A
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: The "Manual Resume" feature is a safety mechanism used when a pool is not working as expected due to flapping services or unstable backend applications. Normally, when a health monitor fails, the pool member is marked "Offline" (Red), and when the monitor passes, it automatically returns to "Available" (Green)47. However, if "Manual Resume" is enabled, the BIG-IP will not automatically put the member back into rotation after a failure48. Even if the health check begins to pass again, the member remains in an
"Offline (Disabled)" state49. This requires an administrator to manually intervene and re-enable the member.
This is a common point of confusion when troubleshooting; a member may show passing health checks but still not receive traffic because it is waiting for a manual administrative "resume" command. This feature is intended to prevent "unhealthy" servers from receiving traffic until an engineer has confirmed the root cause of the initial failure was resolved.
20. Frage
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?
Antwort: C
Begründung:
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, restoring4 the expect5ed load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.
21. Frage
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Antwort: D
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: Troubleshooting configuration-related issues requires a clear trail of what was changed and by whom. The BIG-IP system includes a dedicated audit logging feature for this purpose28. Whenever a system object-such as a virtual server, pool, or iRule-is created, modified, or deleted, the system records the event in /var/log/audit29. These logs provide critical context during troubleshooting by showing if a performance drop or traffic failure coincided with a specific administrative action30. Unlike /var/log/ltm, which focuses on local traffic events like pool member status changes, or /var/log/secure, which handles authentication attempts, the audit log specifically tracks the "how" and "when" of configuration changes31. This is a vital resource for administrators to determine if a virtual server is not working as expected due to a recent manual change or an automated system action, allowing for a rapid "rollback" or correction of the configuration.
22. Frage
A BIG-IP Administrator disabled a virtual server with a pool that has a working health monitor. How does the status icon look for this virtual server?
Antwort: C
Begründung:
BIG-IP status icons provide immediate visual feedback regarding the state of an object based on its availability and enabled/disabled status.
* Color (Black): The color black indicates that an object has been manually Disabled by an administrator.
* Shape (Circle): The circular shape indicates that the object is Available (i.e., its health monitors are passing).
* Scenario Result: Since the virtual server is manually disabled (Black) but its associated pool has a working health monitor that is currently passing (Circle), the resulting icon is a Black Circle.
23. Frage
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