F5 F5CAB2 Dumps Questions Answers

In a BIG-IP high availability (HA) configuration,Auto-Syncis a device trust feature that automatically synchronizes configuration changesfrom the Active device to the Standby devicewithin a Sync-Failover device group.

Key principles from BIG-IP Administration Data Plane Concepts:

TheActive device is always the authoritative source of configuration

Configuration changes are intended to be madeonly on the Active device

WithAuto-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 aStandby device are not preserved

In this scenario:

The administrator modifies a Virtual Server on theStandbydevice

That change islocal onlyand 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), theActive device configuration overwrites the Standby configuration

As a result, the configuration change made on the Standby device isundone.

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 theActive BIG-IP devicewhen Auto-Sync is enabled to ensure consistent and predictable HA behavior.

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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.

In BIG-IP LTM,health monitorsare used to determine the availability of pool members and directly influence traffic flow decisions in the data plane.

Key characteristics of thedefault HTTP monitoraccording to BIG-IP Administration Data Plane Concepts:

Sends an HTTP request (typically GET /)

Expects an HTTP response code of200 OK

Any responseother than 200is treated as amonitor failure

A failed monitor causes the pool member to be markedoffline (down)

In this scenario:

Two pool members return404 Not Found

A 404 response indicates that the requested object was not found

This doesnotmeet the success criteria of the default HTTP monitor

These two members are therefore markedoffline

One pool member returns200 OK

This matches the expected response

The member is markedonline

Resulting Pool Member Availability:

2 members: Offline

1 member: Online

Why the Other Options Are Incorrect:

B– 404 responses are not considered healthy by the default HTTP monitor

C– At least one member responds with the expected 200 OK

D– Members returning 404 responses fail the monitor and cannot be marked online

Key Data Plane Concept Reinforced:

BIG-IP health monitors makebinary availability decisionsbased strictly on configured success criteria. For HTTP monitors, response codes matter—404 is a failure, even if the service is technically reachable.

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