2026 Realistic Verified Free F5 F5CAB2 Exam Questions
F5CAB2 Real Exam Questions and Answers FREE
F5 F5CAB2 Exam Syllabus Topics:
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NEW QUESTION # 12
A virtual server is listening at 10.10.1.100:any and has the following iRule associated with it:
when CLIENT_ACCEPTED { if {[TCP::local_port] equals 21 } { pool
ftppool } elseif {[TCP::local_port] equals 23 } { pool telnetpool }
If a user connects to 10.10.1.100 and port 22, which pool will receive the request?
- A. ftppool
- B. telnetpool
- C. None. The request will be dropped.
- D. Unknown. The pool cannot be determined from the information provided.
Answer: D
NEW QUESTION # 13
When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?
- A. The older system will issue SNMP traps indicating a communication error with the partner.
- B. The first system to be updated will assume the Active role.
- C. Synching should not be performed.
- D. This is not possible since both systems are updated simultaneously.
Answer: C
Explanation:
The F5 BIG-IP upgrade process for HA pairs requires a specific "staggered" approach to maintain uptime.
* Version Mismatch: When one unit is upgraded to a newer version of TMOS (e.g., from 15.1 to 16.1), it enters a26 "Version Mismatch" 27state with its peer.
* Configuration Sync: Because the configuration schemas between different versions are often incompatible, ConfigSync should not be performed. Attempting to sync a newer configuration to an older system (or vice-versa) can cause configuration corruption or system instability.
* Failover Capability: Generally, a pair with a version mismatch can still fail over to ensure traffic continuity during the upgrade window, but administrative changes and syncs must be paused until both units are on the same version.
NEW QUESTION # 14
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)
- A. 02:12:34:56:05:dd
- B. 02:12:34:56:dd:05
- C. 02:12:34:56:01:15
- D. 02:12:34:56:15:01
Answer: A
Explanation:
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:
1501## = 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 # 15
The BIG-IP Administrator needs to ensure that if a pool member is marked down by the monitor, the BIG-IP system sends existing connections to another available pool member. Which task should the BIG-IP Administrator perform to meet this goal?
- A. Reconfigure the pool monitor to mark the member as UP
- B. Enable mirroring within the persistence profile
- C. Set Action on Service Down setting under the pool configuration to reselect
- D. Set Action on Service Down setting under the Virtual Server configuration to reselect
Answer: C
Explanation:
By default, when a pool member is marked "down" by a monitor, the BIG-IP system stops sendingnew connections to that member, but it typically allows existing connections to time out naturally (or resets them depending on profile settings).
* Action on Service Down:This setting is configured at thePoollevel.
* Reselect:When set toReselect, if a pool member is marked down, the BIG-IP system will immediately attempt to pick a different available pool member for any existing, active connections associated with the failed member.
* Client Experience:This is used to maintain the user session by transparently moving the traffic to a healthy server without the client needing to re-establish the connection to the Virtual Server.
NEW QUESTION # 16
What should a BIG-IP Administrator configure to minimize impact during a failover? (Choose one answer)
- A. External monitors
- B. MAC masquerading
- C. OneConnect profile
- D. Clone pool
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP high availability (HA) deployments, one of the primary causes of traffic disruption during failover is Layer 2 and Layer 3 relearning by upstream network devices (switches and routers). When traffic groups move from the Active device to the Standby device, the network must quickly associate the IP addresses with the new device.
Why MAC Masquerading Minimizes Failover Impact:
MAC masquerading allows a traffic group to use a floating, shared MAC address for its Self IPs. This MAC address moves with the traffic group during failover.
Key benefits:
The MAC address does not change when failover occurs
Upstream switches do not need to relearn ARP entries
Traffic resumes almost immediately after failover
Dramatically reduces packet loss and connection interruption
From BIG-IP Administration Data Plane Concepts:
MAC masquerade is specifically designed to provide fast failover
It is a best practice for HA pairs, especially in environments sensitive to latency and connection loss Why the Other Options Are Incorrect:
A . External monitors
Used to check the availability of external resources
Do not reduce network convergence or failover disruption
B . Clone pool
Used for traffic mirroring or security analysis
Has no impact on failover behavior
C . OneConnect profile
Optimizes server-side TCP connections
Does not address ARP or MAC relearning during failover
Key HA Concept Reinforced:
To minimize failover impact on live traffic, BIG-IP administrators should ensure Layer 2 continuity. MAC masquerading is the primary mechanism that enables near-instant failover by preventing ARP and MAC table reconvergence delays.
NEW QUESTION # 17
The network architecture for a BIG-IP consists of an external VLAN and an internal VLAN with two interfaces connected to the upstream switch. The design requires fault tolerance in the case that one of the interfaces is down. Which deployment architecture meets these requirements? (Choose one answer)
- A. One network trunk with both VLANs and LACP enabled, and both VLANs configured as untagged
- B. Two network trunks each with one VLAN and LACP disabled, and one VLAN configured as tagged and one VLAN configured as untagged
- C. Two network trunks each with one VLAN and LACP enabled, and both VLANs configured as tagged
- D. One network trunk with both VLANs and LACP enabled, and both VLANs configured as tagged
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
To meet the requirement of fault tolerance when one interface goes down, BIG-IP must use link aggregation so that loss of a single physical link does not isolate the VLAN(s).
How the objects relate (data plane view)
Interfaces = physical links.
Trunk (LACP) = bundles multiple interfaces into one logical link that provides redundancy (and possibly bandwidth aggregation).
VLANs are assigned to interfaces or trunks. If you need multiple VLANs on the same trunk, they must use 802.1Q tagging (because you can only have one untagged VLAN per interface/trunk).
Self IPs are then placed on the VLANs to provide BIG-IP presence and routing/ARP functions, but self IPs are not what provides link resiliency-the trunk does.
Why Option D is correct
You have two physical interfaces and you want resiliency if one fails → put both interfaces into one trunk with LACP enabled.
You need both external and internal VLANs on those same two links → both VLANs should be configured as tagged on that trunk, so they can coexist on the same aggregated link.
If either physical interface fails, the trunk remains up via the remaining interface, keeping both VLANs operational.
Why the other options are incorrect
A: Two VLANs cannot both be untagged on the same trunk/interface. Only one untagged VLAN is possible; additional VLANs must be tagged.
B: Two trunks "each with one VLAN" would typically mean splitting VLANs across separate trunks. With only two interfaces total, that becomes one interface per trunk-if one interface goes down, the VLAN on that interface is down (no redundancy for that VLAN).
C: Same redundancy problem as B, and disabling LACP removes the negotiated aggregation behavior expected when the switch engineer specifically requested LACP.
NEW QUESTION # 18
Refer to the exhibit.
The network team creates a new VLAN on the switches. The BIG-IP Administrator creates a new VLAN and a Self IP on the BIG-IP device, but the servers on the new VLAN are NOT reachable from the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
- A. Set Port Lockdown of the Self IP to Allow All
- B. Change Auto Last Hop to enabled
- C. Create a Floating Self IP address
- D. Assign a physical interface to the new VLAN
Answer: D
Explanation:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
For BIG-IP to send or receive traffic on a VLAN, that VLAN must be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone is not sufficient to establish data-plane connectivity.
From the exhibit:
The VLAN (vlan_1033) exists and has a tag defined.
A Self IP is configured and associated with the VLAN.
However, traffic cannot reach servers on that VLAN.
This indicates a Layer 2 connectivity issue, not a Layer 3 or HA issue.
Why assigning a physical interface fixes the problem:
BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
A physical interface (e.g., 1.1), or
A trunk
Without an interface assignment, the VLAN is effectively isolated and cannot transmit or receive frames, making servers unreachable regardless of correct IP addressing.
Why the other options are incorrect:
A . Set Port Lockdown to Allow All
Port Lockdown controls which services can be accessed on the Self IP (management-plane access), not whether BIG-IP can reach servers on that VLAN.
B . Change Auto Last Hop to enabled
Auto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
D . Create a Floating Self IP address
Floating Self IPs are used for HA failover. They do not resolve reachability issues on a single device when the VLAN itself is not connected to an interface.
Conclusion:
The servers are unreachable because the VLAN has no physical interface assigned. To restore connectivity, the BIG-IP Administrator must assign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
NEW QUESTION # 19
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
- A. Forwarding IP virtual server
- B. Standard virtual server
- C. Stateless virtual server
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
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 a Forwarding (IP) virtual server are as follows:
Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet looking only 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 a Standard virtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK) before initiating a separate connection to the server, the Forwarding IP virtual server passes the client's original SYN packet directly to the destination node.
Response Timing: The BIG-IP system waits for the SYN-ACK from 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 # 20
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)
- A. 02:12:34:56:05:dd
- B. 02:12:34:56:dd:05
- C. 02:12:34:56:01:15
- D. 02:12:34:56:15:01
Answer: A
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 # 21
A BIG-IP system receives a client connection destined to 1.0.0.10:8080. Multiple virtual servers are configured on the system. Which virtual server will process the connection? (Choose one answer)
- A. A virtual server configured with destination 1.0.0.10:8080 and is available (green)
- B. A forwarding virtual server configured with 1.0.0.10:any (port 0)
- C. A virtual server configured with 0.0.0.0:8080
- D. A forwarding virtual server configured with 0.0.0.0:any
Answer: A
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
BIG-IP uses a virtual server matching and precedence algorithm to determine which virtual server processes an incoming connection. This decision is made entirely in the data plane and is based on how specifically a virtual server matches the destination IP address and port.
BIG-IP Virtual Server Selection Rules (Simplified):
When multiple virtual servers could match a packet, BIG-IP selects the most specific match, using the following precedence:
Exact IP address and exact port
Exact IP address with wildcard port (port 0 / any)
Wildcard IP address with exact port
Wildcard IP address and wildcard port
Applying the Rules to This Scenario:
Incoming traffic destination: 1.0.0.10:8080
Option C: 1.0.0.10:8080
Exact IP match
Exact port match
Highest possible specificity
If the virtual server is available (green), it wins the match
Option B: 1.0.0.10:any
Exact IP match, but wildcard port
Lower priority than an exact IP + exact port match
Option D: 0.0.0.0:8080
Wildcard IP, exact port
Lower priority than an exact IP match
Option A: 0.0.0.0:any
Wildcard IP and wildcard port
Lowest priority, used only if no more specific virtual server exists
Final Determination:
Because a virtual server configured with destination 1.0.0.10:8080 exactly matches both the IP address and port of the incoming connection-and is available-it will always be selected to process the traffic.
Key Data Plane Concept Reinforced:
BIG-IP always processes traffic using the most specific matching virtual server. Exact destination IP and port matches take precedence over any wildcard or forwarding virtual server definitions.
NEW QUESTION # 22
An application is configured so that the same pool member must be used for an entire session, and this behavior must persist across HTTP and FTP traffic. A user reports that a session terminates and must be restarted after the active BIG-IP device fails over to the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)
- A. SYN-cookie insertion threshold and connection low-water mark
- B. Persistence mirroring and Match Across Services
- C. Cookie persistence and session timeout
- D. Stateful failover and Network Failover detection
Answer: B
Explanation:
This scenario combines session continuity, multiple protocols (HTTP and FTP), and HA failover behavior
, which directly implicates persistence handling across devices and services.
Key Requirements Breakdown
* Same pool member for entire session
* Session must survive failover
* Session must span multiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
* Ensures persistence records are synchronized from the active BIG-IP to the standby BIG-IP.
* Without mirroring:
* After failover, the standby device has no persistence table
* Clients are load-balanced again
* Sessions break, forcing users to restart
* Persistence mirroring is essential for session continuity during failover Match Across Services
* Allows a single persistence record to be shared across multiple virtual servers / protocols
* Required when:
* HTTP and FTP must use the same pool member
* Multiple services are part of a single application session
Together, these settings ensure:
* Persistence survives device failover
* Persistence is honored across HTTP and FTP
Why the Other Options Are Incorrect
* A. Cookie persistence and session timeoutCookie persistence only applies to HTTP and does not address FTP or failover synchronization.
* B. Stateful failover and Network Failover detectionStateful failover applies to connection state, not persistence records, and does not link HTTP and FTP sessions.
* D. SYN-cookie insertion threshold and connection low-water markThese are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.
NEW QUESTION # 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)
- A. serv1, serv3
- B. serv1
- C. serv1, serv2, serv3, serv4
- D. serv1, serv3, serv4
Answer: D
Explanation:
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.
NEW QUESTION # 24
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?
- A. Network > Interfaces
- B. Local Traffic > Nodes
- C. Local Traffic > Pools
- D. Local Traffic > Virtual Servers
Answer: C
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 # 25
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 using 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? (Choose one answer)
- A. All members offline
- B. Two members offline and one member online
- C. Two members online and one member offline
- D. All members online
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP LTM, health monitors are used to determine the availability of pool members and directly influence traffic flow decisions in the data plane.
Key characteristics of the default HTTP monitor according to BIG-IP Administration Data Plane Concepts:
Sends an HTTP request (typically GET /)
Expects an HTTP response code of 200 OK
Any response other than 200 is treated as a monitor failure
A failed monitor causes the pool member to be marked offline (down)
In this scenario:
Two pool members return 404 Not Found
A 404 response indicates that the requested object was not found
This does not meet the success criteria of the default HTTP monitor
These two members are therefore marked offline
One pool member returns 200 OK
This matches the expected response
The member is marked online
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 make binary availability decisions based strictly on configured success criteria. For HTTP monitors, response codes matter-404 is a failure, even if the service is technically reachable.
NEW QUESTION # 26
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 using 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? (Choose one answer)
- A. All members offline
- B. Two members offline and one member online
- C. Two members online and one member offline
- D. All members online
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
In BIG-IP LTM, pool member availability is determined by health monitors, which continuously test application responsiveness and correctness.
For the default HTTP monitor, the behavior is defined as follows:
BIG-IP sends an HTTP request (by default, GET /)
The monitor expects a response with HTTP status 200 OK
Any HTTP response code other than 200 is considered a monitor failure
A failed monitor causes the associated pool member to be marked offline (down) Applying this to the scenario:
Two pool members return 404 Not Found
A 404 response indicates the requested object is missing
This response does not satisfy the success criteria of the default HTTP monitor BIG-IP marks these two members as offline One pool member returns 200 OK This matches the expected response code BIG-IP marks this member as online Resulting Pool Status:
2 members: Offline
1 member: Online
Why the Other Options Are Incorrect:
B - Members returning 404 responses cannot be considered healthy
C - At least one member responds with 200 OK, so the entire pool is not offline D - Not all members meet the monitor success criteria Key Data Plane Concept Reinforced:
BIG-IP health monitors validate not just reachability, but application correctness. For HTTP monitors, the response code is critical-404 is treated as a failure, even though the service is reachable.
NEW QUESTION # 27
......
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