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NEW QUESTION # 27
A BIG-IP Administrator makes a configuration change to a Virtual Server on the Standby device of an HA pair. The HA pair is currently configured with Auto-Sync enabled. What effect will the change have on the HA pair configuration? (Choose one answer)
Answer: C
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In a BIG-IP high availability (HA) configuration, Auto-Sync is a device trust feature that automatically synchronizes configuration changes from the Active device to the Standby device within a Sync-Failover device group.
Key principles from BIG-IP Administration Data Plane Concepts:
The Active device is always the authoritative source of configuration
Configuration changes are intended to be made only on the Active device With Auto-Sync enabled, any time the Active device configuration changes, the system automatically pushes the configuration to all Standby members of the device group Configuration changes made directly on a Standby device are not preserved In this scenario:
The administrator modifies a Virtual Server on the Standby device
That change is local only and does not alter the device group's synchronized configuration When Auto-Sync next runs (triggered by a change on the Active device or an internal sync event), the Active device configuration overwrites the Standby configuration As a result, the configuration change made on the Standby device is undone.
Why the Other Options Are Incorrect:
A - The change is not undone only when another change is made; it is undone during the next Auto-Sync operation B - Changes made on the Standby device are never propagated to the Active device D - Auto-Sync does not merge or promote Standby changes into the HA pair configuration Best Practice Reinforced:
Always perform configuration changes on the Active BIG-IP device when Auto-Sync is enabled to ensure consistent and predictable HA behavior.
NEW QUESTION # 28
What type of virtual server should be used to block responses for one IP in a subnet with a virtual server?
(Choose one answer)
Answer: C
Explanation:
In the BIG-IP system, when you need to prevent traffic from reaching a specific destination or being processed by the system, you utilize specific Virtual Server types that act as "denial" points.
* Reject Virtual Servers: When a packet matches a Reject virtual server, the BIG-IP system stops the packet from being processed and sends a reset (RST) in the case of TCP, or an ICMP unreachable message in the case of UDP. This is the preferred method for "blocking" specific IPs when you want the sender to receive immediate notification that the connection was refused.
* Drop Virtual Servers: A Drop virtual server simply discards the packet without sending any response back to the source. While effective for "stealthing" a network, it is often less desirable for standard administration unless specifically mitigating a DoS attack.
* Comparison with Standard: A Standard virtual server is used to process and load balance traffic to a pool of members; it does not inherently act as a "blocking" mechanism for a single IP within a subnet unless combined with complex iRules or Packet Filters.
* Context of the Question: To block responses (or connection attempts) for a specific IP while other traffic in the subnet might be handled by more permissive virtual servers, a more specific (higher precedence) Reject virtual server is the standard administrative approach.
NEW QUESTION # 29
What is required for a virtual server to support clients whose traffic arrives on the internal VLAN and pool members whose traffic arrives on the external VLAN?
Answer: C
NEW QUESTION # 30
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: B
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 # 31
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 the servers on the new VLAN are NOT reachable from the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
Answer: A
Explanation:
For BIG-IP to send or receive traffic on a VLAN, that VLAN must be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone is not sufficient to 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 a Layer 2 connectivity issue, not a Layer 3 or HA issue.
Why assigning a physical interface fixes the problem:
* BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
* A physical interface (e.g., 1.1), or
* A trunk
* 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 accessed on 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 has no physical interface assigned. To restore connectivity, the BIG-IP Administrator must assign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
NEW QUESTION # 32
......
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