F5CAB2 Exam Questions, F5CAB2 Valid Exam Test

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F5 F5CAB2 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Identify the different virtual server types: This domain covers BIG-IP virtual server types: Standard, Forwarding, Stateless, Reject, Performance Layer 4, and Performance HTTP.
Topic 2
  • Explain high availability (HA) concepts: This domain addresses HA concepts including integrity methods, implementation approaches, and advantages of high availability configurations.
Topic 3
  • Determine expected traffic behavior based on configuration: This domain focuses on predicting traffic behavior based on persistence, processing order, object status, egress IPs, and connection
  • rate limits.
Topic 4
  • Define ADC application objects: This domain covers ADC basics including application objects, load balancing methods, server selection, and key ADC features and benefits.

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F5 BIG-IP Administration Data Plane Concepts (F5CAB2) Sample Questions (Q10-Q15):

NEW QUESTION # 10
The BIG-IP Administrator wants to provide quick failover between the F5 LTM devices that are configured as an HA pair with a single Self IP using the MAC Masquerade feature. The administrator configures MAC masquerade for traffic-group-1 using the following command:
`tmsh modify /cm traffic-group traffic-group-1 mac 02:12:34:56:00:00`
However, the Network Operations team identifies an issue with using the same MAC address across multiple VLANs. As a result, the administrator enables Per-VLAN MAC Masquerade to ensure a unique MAC address per VLAN by running:
`tmsh modify /sys db tm.macmasqaddr_per_vlan value true`
What would be the resulting MAC address on a tagged VLAN with ID 1501? (Choose one answer)

Answer: B

Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP high availability (HA) configurations, MAC Masquerade is used to speed up failover by allowing traffic-group-associated Self IPs to retain the same MAC address when moving between devices. This prevents upstream switches and routers from having to relearn ARP entries during a failover event, resulting in near-instant traffic recovery.
By default, MAC masquerade applies one MAC address per traffic group, regardless of how many VLANs the traffic group spans. This can create problems in some network designs because the same MAC address appearing on multiple VLANs may violate network policies or confuse switching infrastructure.
To address this, BIG-IP provides Per-VLAN MAC Masquerade, enabled by the database variable:
`tm.macmasqaddr_per_vlan = true`
When this feature is enabled:
BIG-IP derives a unique MAC address per VLAN
The base MAC address configured on the traffic group remains the first four octets The last two octets are replaced with the VLAN ID expressed in hexadecimal The VLAN ID is encoded in network byte order (high byte first, low byte second)
### VLAN ID Conversion:
VLAN ID: 1501 (decimal)
Convert to hexadecimal:
1501₁₀ = 0x05DD
High byte: 05
Low byte: DD
### Resulting MAC Address:
Base MAC: `02:12:34:56:00:00`
Per-VLAN substitution → last two bytes = `05:DD`
Final MAC address:
`02:12:34:56:05:dd`
### Why the Other Options Are Incorrect:
A (01:15) - Incorrect hexadecimal conversion of 1501
B (dd:05) - Byte order reversed (little-endian, not used by BIG-IP)
D (15:01) - Uses decimal values instead of hexadecimal
### Key BIG-IP HA Concept Reinforced:
Per-VLAN MAC Masquerade ensures Layer 2 uniqueness per VLAN while preserving the fast failover benefits of traffic groups, making it the recommended best practice in multi-VLAN HA deployments.


NEW QUESTION # 11
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?

Answer: A

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 # 12
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?

Answer: A

Explanation:
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).


NEW QUESTION # 13
A BIG-IP Administrator wants to add a new Self IP to the BIG-IP device. Which item should be assigned to the new Self IP being configured?

Answer: C

Explanation:
ASelf IPis an IP address on the BIG-IP system that you associate with a specificVLAN.
* VLAN Association:A Self IP cannot exist independently; it must be bound to a VLAN to define which network segment the BIG-IP can communicate with.
* Layer 2 to Layer 3 Mapping:While a VLAN is associated with physical interfaces or trunks (Layer 2), the Self IP provides the Layer 3 identity for the BIG-IP on that VLAN.
* Traffic Processing:Self IPs are used by the BIG-IP for health checking backend servers, acting as a default gateway for servers, and for HA heartbeat communication.


NEW QUESTION # 14
Which statement is true concerning the default communication between a redundant pair of BIG-IP devices?

Answer: A

Explanation:
Redundant BIG-IP systems (HA pairs) must maintain constant communication to monitor the health of the peer and synchr15onize states.16
* Heartbeats: By default, even with a serial cable, th17e BIG-IP systems exchange "heartbeat" packets over the network to determine if the peer is still alive.
* Network Failover: This involves the exchange of UDP packets (typically on port 1026) at regular intervals.
* Device Service Clustering (DSC): Modern BIG-IP versions use the Central Management (cm) infrastructure to communicate configuration status and sync status constantly.
* Clarification on others: Port lockdown does affect HA communication if misconfigured (A is false).
Mirroring uses separate channels (B is false). Mirroring is never sent over the serial cable because it requires high bandwidth (D is false).


NEW QUESTION # 15
......

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