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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Concepts (F5CAB2) |
| Exam Number: | F5CAB2 |
| Exam Format: | Multiple Choice, Scenario-based Questions |
| Available Languages: | English |
| Related Certifications: | F5 Certified Administrator (F5-CA) F5 Application Delivery Fundamentals F5 BIG-IP Administrator |
| Recommended Training: | F5 BIG-IP Fundamentals Training |
| Exam Registration: | F5 Training & Certification Portal |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored or authorized testing center (varies by region) |
| Pre Condition: | Basic networking knowledge and familiarity with TCP/IP concepts are recommended. |
| Official Syllabus URL: | https://www.f5.com/services/training-certification |
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問題 #22
Which of the following lists the order of preference from most preferred to least preferred when BIG-IP processes and selects a virtual server? (Choose one answer)
答案：B
解題說明：
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version 11.3.0, the system evaluates three primary factors in a fixed order of importance:
Destination Address: The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a "Wildcard" (0.0.0.0/0).
Source Address: If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
Service Port: Finally, if both destination and source specifications are equal, the system checks the port. A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specific destination host, a specific source host, and a specific service port represents the highest level of specificity and thus the highest preference.
問題 #23
Refer to the exhibit above.
A BIG-IP pool is configured with Priority Group Activation = Less than 2 available members. The pool members have different priority groups and availability states. Which pool members are receiving traffic? (Choose one answer)
答案：B
解題說明：
This question tests understanding of Priority Group Activation (PGA) and how BIG-IP determines which pool members are eligible to receive traffic.
Key BIG-IP Priority Group Concepts:
Higher priority group numbers = higher priority
BIG-IP will only send traffic to the highest priority group that meets the Priority Group Activation condition Lower priority groups are activated only when the condition is met Only available (green) members count toward the activation threshold Configuration from the Exhibit:
Priority Group Activation: Less than 2 available members
Pool Members and Status:
Pool Member
Priority Group
Status
serv1
2
Active (available)
serv2
2
Inactive (down)
serv3
1
Active (available)
serv4
1
Active (available)
Step-by-Step Traffic Decision:
BIG-IP first evaluates the highest priority group (Priority Group 2)
Priority Group 2 has:
serv1 → available
serv2 → unavailable
Total available members = 1
Activation rule is Less than 2 available members
Condition is true (1 < 2)
BIG-IP activates the next lower priority group (Priority Group 1)
Traffic is now sent to:
serv1 (Priority Group 2)
serv3 and serv4 (Priority Group 1)
Final Result:
Traffic is distributed to serv1, serv3, and serv4
Why the Other Options Are Incorrect:
A - Ignores activation of the lower priority group
B - serv4 is also active and eligible
C - serv2 is down and cannot receive traffic
Key Data Plane Concept Reinforced:
Priority Group Activation controls when lower-priority pool members are allowed to receive traffic, based strictly on the number of available members in the higher-priority group. In this case, the failure of one high-priority member caused BIG-IP to expand traffic distribution to lower-priority members to maintain availability.
問題 #24
What type of virtual server should be used to block responses for one IP in a subnet with a virtual server? (Choose one answer)
答案：B
解題說明：
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.
問題 #25
The BIG-IP Administrator wants to provide quick failover between the F5 LTM devices that are configured as an HA pair with a single-selfip using the MAC Masquerade feature for this quick failover and runs this command: tmsh modify /cm traffic-group traffic-group-1 mac 02:12:34:56:00:00 However, the Network Operations team has identified an issue with the use of the same MAC address being used within different VLANs. As a result, the administrator decides to implement the Per-VLAN Mac Masquerade in order to have a unique MAC address on each VLAN: tmsh modify /sys db tm.macmasqaddr_per_vlan value true. What would be the resulting MAC address on a tagged VLAN of 1501? (Choose one answer)
答案：D
解題說明：
According to F5 BIG-IP documentation regarding High Availability and MAC Masquerade behavior, the system allows for more granular control over Layer 2 addresses during failover events.
* Standard MAC Masquerade: By default, when a traffic group is assigned a MAC masquerade address (like 02:12:34:56:00:00), the BIG-IP system uses that exact MAC address for all traffic associated with that traffic group across all VLANs. This ensures that upstream switches do not need to relearn ARP entries for the Virtual IP, but it can cause issues in environments where multiple VLANs share the same physical infrastructure or monitoring tools that flag identical MACs across segments.
* Per-VLAN MAC Masquerade: When the system database variable tm.macmasqaddr_per_vlan is set to true, the BIG-IP system calculates a unique MAC address for each VLAN. It does this by taking the base MAC masquerade address configured in the traffic group and adding the VLAN ID (tag) to it.
* Calculation Logic:
* Base MAC: 02:12:34:56:00:00
* VLAN ID: 1501
* To find the suffix, the VLAN ID is converted from decimal to hexadecimal:
* $1501$ in decimal = 05DD in hex.
* The system then applies this offset to the last two octets of the base MAC address.
* 00:00 + 05:DD = 05:DD.
* Result: The final MAC address for VLAN 1501 becomes 02:12:34:56:05:dd.
This ensures that every VLAN has a unique Layer 2 identity while still reaping the benefits of "gratuitous ARP-less" failover provided by MAC masquerading.
問題 #26
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?
答案：A
解題說明：
In the BIG-IP object hierarchy, the destination port for backend traffic is defined at the Pool Member level. 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 Servers define the "front-end" port where clients connect.
Pools define the "back-end" port where the application resides.
Nodes represent the physical server's IP address and do not contain port-specific configuration.
問題 #27
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