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質問 # 29
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?
正解：B
解説：
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).
質問 # 30
A BIG-IP Administrator is making adjustments to an iRule and needs to identify which of the 235 virtual server configured on the BIG-IP device will be affected. How should the administrator obtain this information in an effective way? (Choose one answer)
正解：A
解説：
In a large-scale BIG-IP environment with hundreds of virtual servers, the Network Map is the most effective tool for visualizing and auditing the relationships between various ADC objects.
* The Network Map Functionality: The Network Map provides a hierarchical view of the local traffic objects. It allows an administrator to see the status and dependencies of Virtual Servers, Pools, Pool Members, and associated iRules all in one screen.
* Search and Filter: By navigating to Local Traffic > Network Map, the administrator can use the Advanced Filter. This feature allows for searching specifically for an iRule name or a string within an iRule definition. Once the filter is applied, the system displays only the Virtual Servers that are associated with that specific iRule.
* Efficiency: While the "Virtual Server List" (Option D) can be customized to show columns for iRules, it is often cumbersome to scroll through hundreds of entries. The "iRules List" (Option B) displays the scripts themselves but does not provide a reverse-lookup list of all associated virtual servers in a single view as efficiently as the Network Map.
* Summary of Relationships: The Network Map is specifically designed to answer the question, "What is this object connected to?" making it the primary administrative interface for impact analysis during configuration changes.
質問 # 31
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)
正解：C
解説：
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.
質問 # 32
To emulate stateless IP routing with BIG-IP, what would be the appropriate virtual server type?
正解：C
解説：
The appropriate configuration for emulating conventional stateless IP routing is a Forwarding (IP) virtual server using a FastL4 profile.
A Forwarding (IP) virtual server does not select an application-server pool in the normal load-balancing sense. Instead, BIG-IP forwards the packet toward the destination address originally specified by the client and uses the system's routing table to determine the serverside path. This makes the Forwarding (IP) virtual server the BIG-IP virtual-server type designed to provide router-like Layer 3 forwarding behavior.
BIG-IP processing is inherently stateful, so to approximate stateless router behavior, F5 uses specific FastL4 profile settings with the IP forwarding virtual server. FastL4 is supported with Forwarding (IP) virtual servers and provides efficient Layer 4 packet processing.
Option C is deceptive. BIG-IP does have a virtual server type called Stateless, but F5 documents that this type applies specifically to UDP traffic, requires a default pool, and has significant configuration restrictions. It is therefore not the general mechanism used to emulate stateless IP routing.
A Standard virtual server performs full-proxy processing, while Performance (Layer 4) is primarily used for high-performance Layer 4 application delivery and can use pools. Neither is the intended router-emulation configuration.
Study Guide Reference/Topics: Forwarding (IP) Virtual Servers; FastL4 Profile; Routing Table Processing; Stateful versus Stateless Forwarding; Virtual Server Types.
質問 # 33
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)
正解：D
解説：
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.
質問 # 34
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