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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Exam Number: | F5CAB2 |
| Exam Format: | Scenario-based Questions, Multiple Choice |
| Related Certifications: | F5 BIG-IP Administrator F5 Certified Administrator (F5-CA) F5 Application Delivery Fundamentals |
| Available Languages: | English |
| Recommended Training: | F5 BIG-IP Fundamentals Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge and familiarity with TCP/IP concepts are recommended. |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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NEW QUESTION # 15
What type of virtual server should be used to load balance UDP traffic without considering previous connections?
Answer: A
Explanation:
When handling high-volume UDP traffic where the BIG-IP does not need to maintain any session history or relationship between packets, aStatelessvirtual server is the appropriate choice.
* No Connection Tracking:A stateless virtual server does not create or maintain entries in the BIG-IP connection table. This means the system processes each packet as an individual event, without
"considering previous connections" or packets from the same source.
* High Performance:Because the system bypasses the overhead of state management, stateless virtual servers provide the highest possible throughput for UDP and ICMP traffic.
* Use Cases:This is ideal for services like DNS (stateless queries) or some types of syslog traffic where each packet is independent and doesn't require the persistence or protocol inspection typically provided by a full-proxy.
Why other options are incorrect:
* Forwarding:While a Forwarding (IP) virtual server can handle UDP, it still maintains a state entry in the connection table to ensure return traffic is handled correctly.
* Standard:This is a full-proxy virtual server. It is inherently stateful and requires a connection table entry for every flow it manages.
* Reject:This is a special virtual server type that simply drops incoming traffic and, in the case of TCP, sends a reset (RST) or, for UDP, sends an ICMP unreachable message. It is not a load balancing type.
NEW QUESTION # 16
Which statement is true concerning iRule events?
Answer: C
NEW QUESTION # 17
A BIG-IP Administrator configures remote authentication and needs to ensure that users can still log in even when the remote authentication server is unavailable. Which action should the BIG-IP Administrator take in the remote authentication configuration to meet this requirement? (Choose one answer)
Answer: A
Explanation:
Although remote authentication (LDAP, RADIUS, TACACS+) is a control-plane / management-plane feature, it directly affects availability and resiliency of administrative access, which is a critical operational HA consideration.
How BIG-IP Remote Authentication Works:
BIG-IP can authenticate administrators against:
LDAP
RADIUS
TACACS+
When remote authentication is enabled, BIG-IP by default relies on the remote server for user authentication If the remote authentication server becomes unreachable, administrators may be locked out unless fallback is configured Why "Fallback to Local" Is Required:
The Fallback to Local option allows BIG-IP to:
Attempt authentication against the remote authentication server first
If the remote server is unreachable or unavailable, fall back to:
Local BIG-IP user accounts (admin, or other locally defined users)
This ensures:
Continuous administrative access
Safe recovery during:
Network outages
Authentication server failures
Maintenance windows
This behavior is explicitly recommended as a best practice in BIG-IP administration to avoid loss of management access.
Why the Other Options Are Incorrect:
A . Configure a second remote user directory
Provides redundancy only if both directories are reachable
Does not help if remote authentication as a whole is unavailable
B . Configure a remote role group
Maps remote users to BIG-IP roles
Does not affect authentication availability
D . Set partition access to "All"
Controls authorization scope after login
Has no impact on authentication success
Key Availability Concept Reinforced:
To maintain administrative access resiliency, BIG-IP administrators should always enable Fallback to Local when using remote authentication. This prevents lockouts and ensures access even during authentication infrastructure failures.
NEW QUESTION # 18
Which statement is true concerning cookie persistence?
Answer: B
Explanation:
Cookie Persistence is a Layer 7 persistence method that leverages an HTTP cookie to track a user session.
* IP Independence: Unlike "Source Address Affinity" (which relies on the client's IP), Cookie persistence identifies the session base16d on a unique token provided by the BIG-IP system. This is crucial for environments where many users share a single gateway (NAT) or where a client's IP might change mid-session.
* Encryption and Decryption: For the BIG-IP to insert or read a cookie, it must be able to see the HTTP header. If the traffic is encrypted end-to-end (SSL Pass-through), the BIG-IP cannot use cookie persistence. SSL must be terminated at the BIG-IP (Option B is false).
* Security: By default, BIG-IP cookies are encoded, not clear text. Modern versions allow for easy encryption of these cookies to prevent information leakage (Option C is false).
* Memory vs. Disk: The default behavior is "session-based" (In-memory). A cookie is only written to the client's file system (disk) if an Expiration is configured in the persistence profile (Option D is false).
NEW QUESTION # 19
A development team needs to apply a software fix and troubleshoot one of its servers. The BIG-IP Administrator needs to immediately remove all connections from the BIG-IP system to the back-end server. The BIG-IP Administrator checks the virtual server configuration and finds that a persistence profile is assigned to it.
What should the BIG-IP Administrator do to meet this requirement? (Choose one answer)
Answer: B
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
In BIG-IP traffic management, persistence profiles cause existing client connections (and subsequent requests) to be repeatedly sent to the same pool member. When persistence is enabled, simply preventing new connections is not sufficient if the requirement is to immediately remove all existing connections.
Key behavior of pool member states:
Forced Offline
Immediately removes the pool member from load balancing.
Terminates all existing connections, regardless of persistence.
Prevents new connections from being established.
This is the correct state when urgent maintenance or troubleshooting is required.
Disabled
Prevents new connections from being sent to the pool member.
Allows existing connections to continue, which is not acceptable when persistence is configured and connections must be cleared immediately.
Offline (non-forced)
Similar to Disabled behavior depending on context.
Does not guarantee immediate termination of existing connections.
Manually deleting connections via the command line
Is unnecessary and operationally inefficient.
BIG-IP already provides a supported mechanism (Forced Offline) to cleanly and immediately remove traffic.
Conclusion:
To immediately remove all existing connections, including those maintained by persistence, the BIG-IP Administrator must set the pool member to a Forced Offline state. This directly satisfies the requirement without additional manual steps.
NEW QUESTION # 20
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