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Question 26

Refer to the exhibit.

During a planned upgrade to a BIG-IP HA pair running Active/Standby, an outage to application traffic is reported shortly after the Active unit is forced to Standby. Reverting the failover resolves the outage. What should the BIG-IP Administrator modify to avoid an outage during the next failover event? (Choose one answer)

Correct Answer: D
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
In an Active/Standby BIG-IP design, application availability during failover depends on both units having equivalent data-plane connectivity for the networks that carry application traffic. Specifically:
VLANs are bound to specific interfaces (and optionally VLAN tags).
Floating self IPs / traffic groups move to the new Active device during failover.
For traffic to continue flowing after failover, the new Active device must have the same VLANs available on the correct interfaces that connect to the upstream/downstream networks.
What the symptom tells you:
Traffic works when Device A is Active
Traffic fails when Device B becomes Active
Failback immediately restores traffic
This pattern strongly indicates the Standby unit does not have the VLAN connected the same way (wrong physical interface assignment), so when it becomes Active, it owns the floating addresses but cannot actually pass traffic on the correct network segment.
Why Interface mismatch is the best match:
If the Active unit is already working, its interface mapping is correct.
The fix is to make the Standby unit's VLAN/interface assignment match the Active unit.
That corresponds to changing the Standby device interface to 1.1.
Why the Tag options are less likely here (given the choices and the exhibit intent):
Tag issues can also break failover traffic, but the question/options are clearly driving toward the classic HA requirement: consistent VLAN-to-interface mapping on both devices so the data plane remains functional after the traffic group moves.
Conclusion: To avoid an outage on the next failover, the BIG-IP Administrator must ensure the Standby device uses the same interface (1.1) for the relevant VLAN(s) that carry the application traffic, so when it becomes Active it can forward/receive traffic normally.
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Question 27

Which two statements describe differences between the active and standby systems? (Choose two.)

Correct Answer: C,E
The primary distinction between Activ41e and Standby units revolves around which unit is currently processing traffic.
* Traffic Objects (C & E): The unit in the 43Active state is the only one that answers ARP requests for Virtual Server addresses and Floating Self-IPs. The Standby unit remains "quiet" for these addresses to avoid IP conflicts on the network.
* Monitors (A - False): Both the Active and Standby units perform health monitors on pool members by default. This ensures that the Standby unit is ready to take over with an up-to-date view of the pool's health.
* Failover (B - False): A failover trigger (like a VLAN fail-safe) causes the Active unit to go Standby and the Standby unit to go Active; it affects both.
* Management (D - False): Configuration changes can technically be made on either unit (though it is best practice to make them on the Active unit) and then synchronized to the peer.
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Question 28

An application is configured so that thesame pool member must be used for an entire session, and this behavior must persist acrossHTTP and FTP traffic. A user reports that a session terminates and must be restarted after theactive BIG-IP device fails overto the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)

Correct Answer: C
This scenario combinessession continuity,multiple protocols (HTTP and FTP), andHA failover behavior, which directly implicatespersistence handling across devices and services.
Key Requirements Breakdown
* Samepool member for entire session
* Session must survivefailover
* Session must spanmultiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
* Ensurespersistence records are synchronizedfrom the active BIG-IP to the standby BIG-IP.
* Without mirroring:
* After failover, the standby device hasno persistence table
* Clients are load-balanced again
* Sessions break, forcing users to restart
* Persistence mirroring is essential forsession continuity during failover Match Across Services
* Allows asingle persistence recordto be shared acrossmultiple virtual servers / protocols
* Required when:
* HTTP and FTP must use thesame pool member
* Multiple services are part of a single application session
Together, these settings ensure:
* Persistence survivesdevice failover
* Persistence is honoredacross HTTP and FTP
Why the Other Options Are Incorrect
* A. Cookie persistence and session timeoutCookie persistence only applies to HTTP and does not address FTP or failover synchronization.
* B. Stateful failover and Network Failover detectionStateful failover applies toconnection state, not persistence records, and does not link HTTP and FTP sessions.
* D. SYN-cookie insertion threshold and connection low-water markThese are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.
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Question 29

A BIG-IP Administrator has a cluster of devices.
What should the administrator do after creating a new Virtual Server on device 1? (Choose one answer)

Correct Answer: C
In a BIG-IP device service cluster, configuration objects such as virtual servers, pools, profiles, and iRules are maintained through configuration 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 a local device
* Those changes must be pushed to the group
* The correct operation is "Sync Device to Group"
Why C is correct:
* The virtual server was created only 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 must synchronize 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 may remove 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 group so all devices share the same ADC application objects.
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Question 30

The BIG-IP Administrator wants to provide quick failover between the F5 LTM devices that are configured in an HA Pair with a single traffic-group. The BIG-IP Administrator wants to implement the Mac Masquerade feature for this quick failover and run this command: tmsh modify /cm traffic-group traffic-group-1 mac 02:
12:34:56:00:00. However, the Network Operations team has identified an issue with the use of the same MAC address being used within different VLANs. As a result of this, the BIG-IP Administrator must implement the Per-VLAN Mac Masquerade in order to have a unique MAC address on each VLAN: tmsh modify /sys db tm.
macmasqaddr_per_vlan value true. What would be the resulting MAC address on a tagged VLAN of 1501?

Correct Answer: C
MAC Masquerade allows a traffic group to use a shared MAC address to speed up failover. When the system DB variable tm.macmasqaddr_per_vlan is enabled, the BIG-IP generates a unique MAC address for each VLAN by algorithmically modifying the base MAC address using theVLAN ID.
The calculation forVLAN 1501works as follows:
* Base MAC:The administrator set the base to 02:12:34:56:00:00.
* VLAN ID Conversion:The decimal VLAN ID (1501) must be converted into hexadecimal.
* $1501 \div 16 = 93$ remainder13(Din hex)
* $93 \div 16 = 5$ remainder13(Din hex)
* $5 \div 16 = 0$ remainder5
* Result: $1501$ (Decimal) =05DD(Hex).
* Substitution:The BIG-IP replaces the last two octets of the base MAC address with the hexadecimal representation of the VLAN ID.
* Final Result:02:12:34:56:05:dd.
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