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[General] Pass4sure F5CAB2 Exam Prep & F5CAB2 Training Questions

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【General】 Pass4sure F5CAB2 Exam Prep & F5CAB2 Training Questions

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q45-Q50):NEW QUESTION # 45
A BIG-IP Administrator has acluster of devices.
What should the administrator doafter creating a new Virtual Server on device 1? (Choose one answer)
  • A. Synchronize the settings of thegroup to device 1
  • B. Synchronize the settings ofdevice 1 to the group
  • C. Create a new cluster on device 1
  • D. Create a new virtual server on device 2
Answer: B
Explanation:
In a BIG-IPdevice service cluster, configuration objects such asvirtual servers, pools, profiles, and iRules are maintained throughconfiguration synchronization (config-sync).
Key BIG-IP concepts involved:
* Device Service Cluster (DSC)A cluster is a group of BIG-IP devices that share configuration data. One device is typically used to make changes, which are then synchronized to the rest of the group.
* Config-Sync Direction Matters
* Changes are made on alocal device
* Those changes must bepushed to the group
* The correct operation is"Sync Device to Group"
WhyCis correct:
* The virtual server was createdonly on device 1
* Other devices in the cluster do not yet have this object
* To propagate the new virtual server to all cluster members, the administrator mustsynchronize device 1 to the group Why the other options are incorrect:
* A. Synchronize the settings of the group to device 1This would overwrite device 1's configuration with the group's existing configuration and mayremove the newly created virtual server.
* B. Create a new cluster on device 1The cluster already exists. Creating a new cluster is unnecessary and disruptive.
* D. Create a new virtual server on device 2This defeats the purpose of centralized configuration management and risks configuration drift.
Conclusion:
After creating a new virtual server on a BIG-IP device that is part of a cluster, the administrator must synchronize the configuration from that device to the groupso all devices share the same ADC application objects.

NEW QUESTION # 46
Which statement is true concerning cookie persistence?
  • A. If a client's browser accepts cookies, cookie persistence will always cause a cookie to be written to the client's file system.
  • B. Cookie persistence uses a cookie that stores the virtual server, pool name, and member IP address in clear text.
  • C. Cookie persistence allows persistence even if the data are encrypted from client to pool member.
  • D. Cookie persistence allows persistence independent of IP addresses.
Answer: D
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 # 47
What command will assist the BIG-IP Administrator in finding the tmm routes when in the TMSH CLI?
  • A. show net
  • B. list net route
  • C. show net route
  • D. list net
Answer: C
Explanation:
In the Traffic Management Shell (TMSH), there is a distinct difference between list and show commands.
* List Command: Used to view theconfigurationof an object (what is stored in the config file). list net route would show you the static routes you have manually configured.
* Show Command: Used to view thestatus, statistics, and real-time stateof an object.
* TMM Routes: Because the routing table (RIB/FIB) is a dynamic entity that includes both static routes and learned routes (such as those from a routing protocol or connected subnets), the show net route command is required to see the active routing table as it exists in the Traffic Management Microkernel (TMM).
Key Command Breakdown:
* show net route: Displays the active TMM routing table, including destination, gateway, and the status of the route.

NEW QUESTION # 48
What should a BIG-IP Administrator configure to minimize impact during a failover? (Choose one answer)
  • A. OneConnect profile
  • B. MAC masquerading
  • C. Clone pool
  • D. External monitors
Answer: B
Explanation:
In BIG-IP high availability (HA) deployments, one of the primary causes of traffic disruption during failover is Layer 2 and Layer 3 relearning by upstream network devices (switches and routers). When traffic groups move from the Active device to the Standby device, the network must quickly associate the IP addresses with the new device.
Why MAC Masquerading Minimizes Failover Impact:
MAC masquerading allows a traffic group to use a floating, shared MAC address for its Self IPs. This MAC address moves with the traffic group during failover.
Key benefits:
* The MAC address does not change when failover occurs
* Upstream switches do not need to relearn ARP entries
* Traffic resumes almost immediately after failover
* Dramatically reduces packet loss and connection interruption
From BIG-IP Administration Data Plane Concepts:
* MAC masquerade is specifically designed to provide fast failover
* It is a best practice for HA pairs, especially in environments sensitive to latency and connection loss Why the Other Options Are Incorrect:
* A. External monitors
* Used to check the availability of external resources
* Do not reduce network convergence or failover disruption
* B. Clone pool
* Used for traffic mirroring or security analysis
* Has no impact on failover behavior
* C. OneConnect profile
* Optimizes server-side TCP connections
* Does not address ARP or MAC relearning during failover
Key HA Concept Reinforced:
To minimize failover impact on live traffic, BIG-IP administrators should ensure Layer 2 continuity. MAC masquerading is the primary mechanism that enables near-instant failover by preventing ARP and MAC table reconvergence delays.

NEW QUESTION # 49
A BIG-IP Administrator assigns the default http health monitor to a pool that has three members listening on port 80. When the administrator connects to each pool member via the CURL utility, two of the members respond with a status of 404 Not Found while the third responds with 200 OK. What will the pool show for member availability?
  • A. All members offline
  • B. All members online
  • C. Two members online and one member offline
  • D. Two members offline and one member online
Answer: B
Explanation:
The behavior of a health monitor is determined by itsSend StringandReceive String.
* Default HTTP Monitor:The pre-configured default HTTP monitor on a BIG-IP system has an empty Receive String.
* Success Criteria:When the Receive String is blank, the BIG-IP system considers the health check successful if it receivesany valid HTTP responsefrom the server.
* Status Code Interpretation:Because a 404 Not Found is a valid HTTP status code (it is a properly formatted response from a running web server process), the BIG-IP interprets this as the application being "alive".
* Result:All three members (including the two returning 404s and the one returning 200) will be marked asUP/Available(Green).

NEW QUESTION # 50
......
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