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NEW QUESTION # 12
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)
- A. The Tag value on the Active device
- B. The Tag value on the Standby device
- C. The Interface on the Standby device to 1.1
- D. The interface on the Active device to 1.1
Answer: C
Explanation:
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.
NEW QUESTION # 13
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. Create a new virtual server on device 2
- B. Create a new cluster on device 1
- C. Synchronize the settings ofdevice 1 to the group
- D. Synchronize the settings of thegroup to device 1
Answer: C
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 # 14
A BIG-IP Administrator needs to apply a health monitor for a pool of database servers named DB_Pool that uses TCP port 1521.
Where should the BIG-IP Administrator apply this monitor?
- A. Local Traffic > Profiles » Protocol > TCP
- B. Local Traffic > Pools > De Pool > Members
- C. Local Traffic > Nodes > Default Monitor
- D. Local Traffic > Pools > DB Pool > Properties
Answer: D
NEW QUESTION # 15
To increase the available bandwidth of an existing trunk, the BIG-IP Administrator plans to add additional interfaces. Which command should the BIG-IP Administrator run from within the bash shell? (Choose one answer)
- A. tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
- B. tmsh modify /sys trunk trunk_A interfaces add {1.3 1.4}
- C. tmsh create /sys trunk trunk_A interfaces add {1.3 1.4}
- D. tmsh create /net trunk trunk_A interfaces add {1.3 1.4}
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP, a trunk is a Layer 2 network object used to aggregate multiple physical interfaces into a single logical link. This aggregation provides increased bandwidth and link resiliency, commonly in conjunction with LACP.
Key concepts that apply here:
Trunks are managed under the /net trunk tmsh hierarchy
Physical interfaces are added or removed using the modify command
The create command is used only when defining a brand-new trunk, not when updating an existing one Because the trunk already exists and the goal is to add interfaces, the correct operation is:
tmsh modify /net trunk trunk_A interfaces add {1.3 1.4}
This command:
Modifies the existing trunk named trunk_A
Adds interfaces 1.3 and 1.4 to the trunk
Immediately increases available bandwidth and redundancy
Why the Other Options Are Incorrect
B uses the /sys hierarchy, which is not used for trunks
C attempts to create a trunk that already exists
D uses an incorrect hierarchy and an incorrect operation
NEW QUESTION # 16
An organization needs to deploy an HTTP application on a BIG-IP system. The requirements specify hardware acceleration to enhance performance, while HTTP optimization features are not required.
What type of virtual server and associated protocol profile should be used to meet these requirements? (Choose one answer)
- A. Type: Standard Protocol Profile: tcp-wan-optimized
- B. Type: Stateless Protocol Profile: fastL4
- C. Type: Performance (Layer 4) Protocol Profile: fastL4
- D. Type: Performance (HTTP) Protocol Profile: fasthttp
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
To select the correct virtual server type, an administrator must balance the need for L7 intelligence versus raw throughput and hardware offloading:
Performance (Layer 4) Virtual Server: This type is designed for maximum speed. It uses the fastL4 profile, which allows the BIG-IP system to leverage the ePVA (Embedded Packet Velocity Accelerator) hardware chip. When a Performance (L4) virtual server is used, the system processes packets at the network layer (L4) without looking into the application payload (L7). This fulfills the requirement for hardware acceleration and avoids the overhead of HTTP optimization features, which are not needed in this scenario.
Performance (HTTP) Virtual Server: While fast, this type uses the fasthttp profile to provide some L7 awareness and optimization (like header insertion or small-scale multiplexing). Since the requirement specifically states HTTP optimization is not required, the L4 variant is more efficient.
Standard Virtual Server: This is a full-proxy type. While it offers the most features (SSL offload, iRules, Compression), it processes traffic primarily in the TMOS software layer (or via high-level hardware assistance), which is "slower" than the pure hardware switching path of the Performance (L4) type.
Stateless Virtual Server: This is typically used for specific UDP/ICMP traffic where the system does not need to maintain a connection table. It is not appropriate for standard HTTP (TCP) applications requiring persistent sessions or stateful load balancing.
By choosing Performance (Layer 4) with the fastL4 profile, the organization ensures that the traffic is handled by the hardware acceleration chips, providing the lowest latency and highest throughput possible for their HTTP application.
NEW QUESTION # 17
The BIG-IP Administrator needs to ensure that if a pool member is marked down by the monitor, the BIG-IP system sends existing connections to another available pool member. Which task should the BIG-IP Administrator perform to meet this goal?
- A. Reconfigure the pool monitor to mark the member as UP
- B. Enable mirroring within the persistence profile
- C. Set Action on Service Down setting under the pool configuration to reselect
- D. Set Action on Service Down setting under the Virtual Server configuration to reselect
Answer: C
Explanation:
By default, when a pool member is marked "down" by a monitor, the BIG-IP system stops sendingnew connections to that member, but it typically allows existing connections to time out naturally (or resets them depending on profile settings).
* Action on Service Down:This setting is configured at thePoollevel.
* Reselect:When set toReselect, if a pool member is marked down, the BIG-IP system will immediately attempt to pick a different available pool member for any existing, active connections associated with the failed member.
* Client Experience:This is used to maintain the user session by transparently moving the traffic to a healthy server without the client needing to re-establish the connection to the Virtual Server.
NEW QUESTION # 18
Refer to the exhibit.
The network team creates a new VLAN on the switches. The BIG-IP Administrator creates a new VLAN and a Self IP on the BIG-IP device, but theservers on the new VLAN are NOT reachablefrom the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
- A. Create aFloating Self IP address
- B. ChangeAuto Last Hopto enabled
- C. Assign aphysical interfaceto the new VLAN
- D. Set Port Lockdown of the Self IP toAllow All
Answer: C
Explanation:
For BIG-IP to send or receive traffic on a VLAN, that VLANmust be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone isnot sufficientto establish data-plane connectivity.
From the exhibit:
* The VLAN (vlan_1033) exists and has a tag defined.
* A Self IP is configured and associated with the VLAN.
* However, traffic cannot reach servers on that VLAN.
This indicates aLayer 2 connectivity issue, not a Layer 3 or HA issue.
Whyassigning a physical interfacefixes the problem:
* BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
* Aphysical interface(e.g., 1.1), or
* Atrunk
* Without an interface assignment, the VLAN is effectively isolated and cannot transmit or receive frames, making servers unreachable regardless of correct IP addressing.
Why the other options are incorrect:
* A. Set Port Lockdown to Allow AllPort Lockdown controls which services can be accessedon the Self IP(management-plane access), not whether BIG-IP can reach servers on that VLAN.
* B. Change Auto Last Hop to enabledAuto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
* D. Create a Floating Self IP addressFloating Self IPs are used for HA failover. They do not resolve reachability issues on a single device when the VLAN itself is not connected to an interface.
Conclusion:
The servers are unreachable because the VLAN hasno physical interface assigned. To restore connectivity, the BIG-IP Administrator mustassign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
NEW QUESTION # 19
A BIG-IP Administrator is conducting maintenance on one BIG-IP appliance in an HA Pair. Why should the BIG-IP Administrator put the appliance into FORCED-OFFLINE state?
- A. To allow new connections to Virtual Servers and ensure the appliance becomes active
- B. To terminate existing connections to Virtual Servers and prevent the appliance from becoming active
- C. To preserve existing connections to Virtual Servers and reduce the CPU load
- D. To terminate connections to the management IP and decrease persistent connections
Answer: B
Explanation:
TheForced Offlinestate is a critical administrative tool used during maintenance to ensure a device remains in a non-functional state relative to the traffic group.
* Preventing Active Status:When a device is in "Forced Offline," it is effectively disqualified from the HA election process. Even if the other peer fails, a device in Forced Offline willnotbecome active. This is vital during maintenance (like firmware upgrades or hardware replacement) to prevent an unstable or half-configured device from attempting to process traffic.
* Traffic Termination:Placing a device in Forced Offline triggers the system to stop accepting new connections and, depending on the configuration, can facilitate the termination of existing connections so that the administrator can perform work without the data plane actively utilizing system resources.
* Persistence Handling:Unlike the "Disabled" state, Forced Offline ignores persistence records, ensuring that no new traffic is steered to the device via session affinity.
NEW QUESTION # 20
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?
- A. 02:12:34:56:05:dd
- B. 02:12:34:56:dd:05
- C. 02:12:34:56:01:15
- D. 02:12:34:56:15:01
Answer: A
Explanation:
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.
NEW QUESTION # 21
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)
- A. Service port → Destination host address → Source host address
- B. Destination host address → Source host address → Service port
- C. Source host address → Service port → Destination host address
Answer: B
Explanation:
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version 11.3.0, the system evaluates three primary factors in a fixed order of importance:
Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a "Wildcard" (0.0.0.0/0).
Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.
NEW QUESTION # 22
The owner of a web application asks the BIG-IP Administrator to change the port that the BIG-IP device sends traffic to. This change must be made for each member in the server pool named app_pool for the Virtual Server named app_vs. In which area of the BIG-IP Configuration Utility should the BIG-IP Administrator make this change?
- A. Network > Interfaces
- B. Local Traffic > Nodes
- C. Local Traffic > Pools
- D. Local Traffic > Virtual Servers
Answer: C
Explanation:
In the BIG-IP object hierarchy, the destination port for backend traffic is defined at thePool Memberlevel.
While a Virtual Server listens on a specific port, the Pool determines where that traffic is directed after the load balancing decision is made.
* Pools and Pool Members: A pool is a collection of devices, often called pool members, to which the BIG-IP system passes traffic. Each pool member is defined by an IP address and a service port.
* Port Translation: When an administrator needs to change the port the BIG-IP uses to communicate with backend servers, they must navigate to the specific Pool and modify the service port for each member within that pool.
* Logical Separation:
* Virtual Serversdefine the "front-end" port where clients connect.
* Poolsdefine the "back-end" port where the application resides.
* Nodesrepresent the physical server's IP address and do not contain port-specific configuration.
NEW QUESTION # 23
Refer to the exhibit above.
A BIG-IP pool is configured with Priority Group Activation = Less than 2 available members. The pool members have different priority groups and availability states. Which pool members are receiving traffic?
(Choose one answer)
- A. serv1, serv3
- B. serv1
- C. serv1, serv2, serv3, serv4
- D. serv1, serv3, serv4
Answer: D
Explanation:
This question tests understanding of Priority Group Activation (PGA) and how BIG-IP determines which pool members are eligible to receive traffic.
Key BIG-IP Priority Group Concepts:
* Higher priority group numbers = higher priority
* BIG-IP will only send traffic to the highest priority group that meets the Priority Group Activation condition
* Lower priority groups are activated only when the condition is met
* Only available (green) members count toward the activation threshold
Configuration from the Exhibit:
* Priority Group Activation: Less than 2 available members
* Pool Members and Status:
Pool Member
Priority Group
Status
serv1
2
Active (available)
serv2
2
Inactive (down)
serv3
1
Active (available)
serv4
1
Active (available)
Step-by-Step Traffic Decision:
* BIG-IP first evaluates the highest priority group (Priority Group 2)
* Priority Group 2 has:
* serv1 # available
* serv2 # unavailable
* Total available members = 1
* Activation rule is Less than 2 available members
* Condition is true (1 < 2)
* BIG-IP activates the next lower priority group (Priority Group 1)
* Traffic is now sent to:
* serv1 (Priority Group 2)
* serv3 and serv4 (Priority Group 1)
Final Result:
Traffic is distributed to serv1, serv3, and serv4
Why the Other Options Are Incorrect:
* A - Ignores activation of the lower priority group
* B - serv4 is also active and eligible
* C - serv2 is down and cannot receive traffic
Key Data Plane Concept Reinforced:
Priority Group Activation controls when lower-priority pool members are allowed to receive traffic, based strictly on the number of available members in the higher-priority group. In this case, the failure of one high-priority member caused BIG-IP to expand traffic distribution to lower-priority members to maintain availability.
NEW QUESTION # 24
What type of virtual server has a destination of 0.0.0.0 and listens on a specific VLAN? (Choose one answer)
- A. Forwarding (Layer 2)
- B. Wildcard
- C. Standard
- D. Forwarding (IP)
Answer: B
Explanation:
In the F5 BIG-IP system, virtual servers are categorized based on their destination address and mask. The system distinguishes between three primary destination scopes:
* Host Virtual Server: A virtual server that has a specific IP address (e.g., 10.10.10.50) and a /32 mask.
* Network Virtual Server: A virtual server that has a destination address representing a subnet (e.g.,
192.168.10.0) and a specific mask (e.g., /24).
* Wildcard Virtual Server: A virtual server that has a destination address of 0.0.0.0 (or :: for IPv6) and a mask of 0.0.0.0 (or /0).
While a "Forwarding (IP)" virtual server (Option D) is the Type (behavioral configuration) often used to route traffic without load balancing, the term Wildcard (Option C) is the specific administrative term used to define the "type" of virtual server based on the 0.0.0.0 destination address.
A common architectural use case is to create a Wildcard Virtual Server that listens only on an internal VLAN to act as a default gateway for outbound traffic (Internet access) for back-end servers. This ensures the BIG-IP system can process and forward traffic that does not match any other specific virtual server configuration.
NEW QUESTION # 25
A BIG-IP system receives UDP traffic from a specific source. The administrator wants the traffic to be forwarded, not dropped or rejected. Which virtual server type should be used? (Choose one answer)
- A. Standard
- B. Block
- C. Reject
- D. Drop
Answer: A
Explanation:
BIG-IP virtual server types define how traffic is handled at the data plane when it matches a virtual server's destination address and service port.
According to BIG-IP Administration Data Plane Concepts:
* Standard virtual server
* The default and most commonly used type
* Accepts client connections and forwards traffic to pool members
* Supports both TCP and UDP traffic
* Allows full use of profiles (UDP, FastL4, persistence, etc.) and iRules
* Required when the goal is to process and pass traffic through BIG-IP
* Drop virtual server
* Silently discards matching traffic
* No response is sent to the client
* Reject virtual server
* Actively rejects traffic by sending an error response
* For UDP, BIG-IP may send an ICMP unreachable message
* Block virtual server
* Used to block traffic at the virtual server level
* Traffic is neither forwarded nor processed by pools
In this scenario:
* The administrator explicitly wants the UDP traffic to be forwarded
* Only a Standard virtual server forwards traffic to a pool or next-hop destination Why the Other Options Are Incorrect:
* A. Drop - Traffic is silently discarded
* B. Reject - Traffic is actively rejected
* C. Block - Traffic is blocked and not forwarded
Key Data Plane Concept Reinforced:
When traffic must be accepted and forwarded-regardless of whether it is TCP or UDP-the BIG-IP administrator must use a Standard virtual server, which is the only virtual server type designed for normal application traffic processing.
NEW QUESTION # 26
A BIG-IP Administrator is making adjustments to an iRule and needs to identify which of the 235 Virtual Servers configured on the BIG-IP device will be affected. How should the administrator obtain this information in an efficient way?
- A. Local Traffic > Virtual Servers
- B. Local Traffic > Network Map
- C. Local Traffic > iRules
- D. Local Traffic > Pools
Answer: C
Explanation:
When managing a large environment with hundreds of Virtual Servers, the most efficient way to identify the relationship between an iRule and the objects it manages is to view the properties of the iRule itself.
* iRule Properties:Within the BIG-IP Configuration Utility, navigating toLocal Traffic > iRulesand selecting a specific iRule provides a "Statistics" or "Usage" tab (depending on the version). This view explicitly lists all Virtual Servers currently associated with that specific iRule.
* Centralized Management:Instead of manually checking 235 individual Virtual Servers under the
"Virtual Servers" menu, the iRules menu acts as a central point of reference for that specific logic.
* Data Plane Impact:Because iRules can modify traffic flow, headers, and load balancing decisions, seeing the full list of affected Virtual Servers is critical before making adjustments to avoid unintended side effects across the application portfolio.
NEW QUESTION # 27
The BIG-IP appliance fails to boot. The BIG-IP Administrator needs to run the End User Diagnostics (EUD) utility to collect data to send to F5 Support.
Where can the BIG-IP Administrator access this utility?
- A. Management Port
- B. Internal VLAN interface
- C. Console Port
- D. External VLAN interface
Answer: C
NEW QUESTION # 28
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
- A. Forwarding IP virtual server
- B. Standard virtual server
- C. Stateless virtual server
Answer: A
Explanation:
The diagram illustrates a specific TCP handshake sequence where the BIG-IP system acts as a transparent forwarder rather than a full proxy. The key indicators that identify this as aForwarding (IP) virtual server are as follows:
* Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet lookingonly at the destination IP address. This is the fundamental characteristic of a Forwarding IP virtual server, which uses the system's routing table to make forwarding decisions instead of load balancing to a pool of members.
* Handshake Sequence: Unlike aStandardvirtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK)beforeinitiating a separate connection to the server, the Forwarding IP virtual server passes the client's originalSYNpacket directly to the destination node.
* Response Timing: The BIG-IP system waits for theSYN-ACKfrom the destination node before it sends a SYN-ACK back to the client. It essentially "passes through" the handshake signals while still maintaining a state entry in the connection table to track the flow.
* Packet-by-Packet Logic: While it tracks the state, it does not perform address translation (unless SNAT is specifically configured) or deep packet inspection like a full proxy would.
Why other options are incorrect:
* Standard virtual server: A Standard virtual server is a "full proxy." It would finish the handshake with the client first and only then open a second, independent TCP connection to the backend server.
* Stateless virtual server: A stateless virtual server does not track connections in the connection table.
The diagram shows the system meticulously passing sequence numbers ($seq\_num$) and acknowledgment numbers ($ack\_num$) between the two sides, which requires stateful tracking of the TCP flow.
NEW QUESTION # 29
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)
- A. Configure a second remote user directory
- B. Set partition access to All
- C. Configure a remote role group
- D. Enable the Fallback to Local option
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
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 # 30
......
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