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NEW QUESTION # 27
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
Answer: B
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 # 28
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: D
Explanation:
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 # 29
A BIG-IP Administrator is informed that traffic on interface 1.1 is expected to increase beyond the maximum bandwidth capacity of the link. There is a single VLAN on the interface.
What should the BIG-IP Administrator do to increase the total available bandwidth? (Choose one answer)
Answer: C
Explanation:
On BIG-IP systems, physical interface bandwidth is fixed by the link speed (for example, 1GbE or 10GbE).
When traffic demand exceeds the capacity of a single interface, BIG-IP provides link aggregation through trunks.
Key concepts involved:
* InterfacesA single physical interface (such as 1.1) is limited to its negotiated link speed. You cannot exceed this capacity through software tuning alone.
* Trunks (Link Aggregation)A trunk combines multiple physical interfaces into a single logical interface.
* BIG-IP supports LACP and static trunks.
* Traffic is distributed across member interfaces, increasing aggregate bandwidth and providing redundancy.
* VLANs are then assigned to the trunk, not directly to individual interfaces.
Why option B is correct:
* Creating a trunk with two interfaces allows BIG-IP to use both physical links simultaneously.
* This increases total available bandwidth (for example, two 10Gb interfaces # up to 20Gb aggregate capacity).
* This is the documented and supported method for scaling bandwidth on BIG-IP.
Why the other options are incorrect:
* A. Increase the MTUMTU changes affect packet size and efficiency, not total bandwidth capacity.
* C. Assign two interfaces to the VLANBIG-IP does not support assigning a VLAN to multiple interfaces directly. VLANs must be associated with one interface or one trunk.
* D. Set the media speed manuallyMedia speed can only be set up to the physical capability of the interface and connected switch port. It cannot exceed the hardware limit.
Conclusion:
To increase total available bandwidth on BIG-IP when a single interface is insufficient, the administrator must create a trunk object with multiple interfaces and move the VLAN onto the trunk. This aligns directly with BIG-IP data plane design and best practices.
NEW QUESTION # 30
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: A
Explanation:
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 # 31
To increase available bandwidth of an existing Trunk, the BIG-IP Administrator is adding additional interfaces. Which command should the BIG-IP Administrator run from within bash shell?
Answer: C
Explanation:
Configuring networking objects in BIG-IP requires using the correctTMSH module pathandverb.
* Module Path:Trunks are networking objects, so they reside under the /net module, not /sys.
* Verb:Since the trunk already exists, the modify verb must be used to update its properties rather than create.
* Syntax:The correct syntax to append physical interfaces to an existing trunk is tmsh modify /net trunk
[name] interfaces add { [port list] }.
* Data Plane Impact:Adding interfaces to a trunk (Link Aggregation) increases the total aggregate bandwidth available to the system and provides additional hardware redundancy.
NEW QUESTION # 32
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