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F5 F5CAB5 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Monitoring & Health Checks10%- Monitor types and configuration
  • 1. ICMP, TCP, HTTP, and custom monitors
  • 2. Monitor status and interpretation
Topic 2: Maintenance & Upgrades10%- Software installation and upgrades
  • 1. Configuration backup and restore
  • 2. Image management and installation process
Topic 3: Troubleshooting & Support20%- Tools and log analysis
  • 1. Log files: /var/log and system logs
  • 2. tmsh, bigpipe, and command-line utilities
- Common issues and resolution
  • 1. Performance and resource problems
  • 2. Connectivity and traffic failures
Topic 4: BIG-IP System Architecture & Initial Setup20%- Platform and hardware components
  • 1. Traffic management modules
  • 2. Chassis, blades, and interfaces
- Initial configuration and licensing
  • 1. Licensing activation and registration
  • 2. Network setup and management interfaces
Topic 5: Traffic Management Fundamentals25%- Profiles and persistence
  • 1. Protocol profiles (HTTP, TCP, SSL)
  • 2. Persistence types and configuration
- Virtual servers, pools, and nodes
  • 1. Creation and configuration
  • 2. Load balancing methods
Topic 6: Networking & Routing15%- VLANs, self-IPs, and routes
  • 1. Interface and VLAN configuration
  • 2. Static and dynamic routing
- High availability setup
  • 1. Device service clustering (DSC)
  • 2. Sync-failover and mirroring

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q56-Q61):

NEW QUESTION # 56
Which command is used to capture traffic on BIG-IP?

Answer: C

Explanation:
tcpdump is the primary CLI tool for capturing and analyzing network packets.


NEW QUESTION # 57
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: A

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, meaning all 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 is only 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 # 58
Which command shows routing table?

Answer: A

Explanation:
Displays routes used for packet forwarding decisions.


NEW QUESTION # 59
A BIG-IP Administrator creates a new Virtual Server. The end user is unable to access the page.
During troubleshooting, the administrator learns that the connection between the BIG-IP system and server is NOT set up correctly. What should the administrator do to solve this issue?

Answer: D

Explanation:
When a virtual server is not working as expected despite the pool members being marked "UP" (Green), the issue is frequently a return-path routing failure. If the BIG-IP forwards a request with the original client's source IP address, the backend server will try to respond directly to that client.
If the server does not have its default gateway pointed back to the BIG-IP, the response packet will be routed elsewhere (or dropped), resulting in a connection timeout for the user. To resolve this, the administrator must configure "Source Address Translation" (SNAT). By setting SNAT to
"Automap" or a specific SNAT address, the BIG-IP replaces the client's IP with its own internal self-IP. The backend server then sees the BIG-IP as the source and sends the response back to it locally. This troubleshooting step ensures a functional, symmetric traffic flow. Identifying the need for SNAT is one of the most common troubleshooting tasks for new virtual server deployments where the BIG-IP is not the default gateway for the backend servers.


NEW QUESTION # 60
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, restoring4 the expect5ed load balancing functionality and resolving the slow performance reported by users behind the corporate proxy.


NEW QUESTION # 61
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