[2026] Earn Quick And Easy Success With F5CAB3 Dumps
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F5 F5CAB3 Exam Syllabus Topics:
| Topic | Details |
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| Topic 1 |
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| Topic 2 |
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NEW QUESTION # 14
Which type of Virtual Server requires the use of a FastL4 profile?
- A. Stateless
- B. Performance (Layer 4)
- C. Performance (HTTP)
- D. Standard
Answer: B
Explanation:
Performance (Layer 4) virtual servers rely on FastL4 profiles to provide high-speed L4 processing without full proxy overhead.
Below is BATCH 2 (next 10 questions) extracted only from your uploaded document that are clearly related to BIG-IP Administration: Data Plane Configuration topics.
#As requested, I have strictly excluded questions related to:
* Licensing
* HA / Device Trust / Sync-only
* Logging destinations
* User roles
* Hardware, EUD, support processes
* System-only administration
Source: Your uploaded TMOS Administration v2.0 document
NEW QUESTION # 15
A Standard Virtual Server for a web application is configured with SNAT Automap. The original client IP must be known by backend servers.
What should the BIG-IP Administrator configure?
- A. SNAT pool using client IP
- B. HTTP profile with X-Forwarded-For
- C. HTTP Transparent profile
- D. Performance (HTTP) Virtual Server
Answer: B
Explanation:
X-Forwarded-For inserts the original client IP into HTTP headers while SNAT is enabled.
NEW QUESTION # 16
Which persistence profile would be the most appropriate to ensure an HTTP web request connects to the same pool member? (Choose one answer)
- A. SSL persistence
- B. Cookie persistence
- C. Hash persistence
- D. Destination address
Answer: B
Explanation:
For HTTP-based applications, cookie persistence is the most appropriate and commonly recommended persistence method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Cookie persistence inserts or uses an HTTP cookie to maintain session affinity.
It operates at Layer 7 (HTTP) and is application-aware.
It allows persistence to be maintained even when multiple clients are behind a NAT device.
Why the other options are incorrect:
A). Destination addressDestination address persistence is generally used for inbound traffic patterns such as firewall or proxy scenarios.
B). Hash persistenceHash persistence is less granular and not HTTP-specific.
C). SSL persistenceSSL persistence is typically used when SSL session IDs are reused and is less reliable than cookies for HTTP applications.
Correct Resolution:
Using cookie persistence ensures that HTTP web requests are consistently directed to the same pool member.
NEW QUESTION # 17
Which of the following has iApp configured objects?
- A. ltm virtual /Common/app2_vs {creation-time 2020-02-07:09:48:01description https://app2.apmsupport.
localdestination /Common/10.155.47.161:443ip-protocol tcplast- modified-time 2024-05-13:06:02:
40mask 255.255.255.255pool /Common/https_lamp_poolprofiles {/Common/apm_support {context clientside}/Common/f5-tcp-progressive {}/Common/http {}/Common/multi_domain_ap {}/Common
/rba {}/Common/serverssl {context serverside}/Common/websso {}}serverssl-use-sni disabledsource
0.0.0.0/0source-address-translation {type automap}translate-address enabledtranslate-port enabled} - B. ltm virtual /Common/test_vs {creation-time 2023-09-01:12:28:27destination /Common/10.176.21.11:
443disabledip-protocol tcplast-modified-time 2023-09-01:12:29:40mask 255.255.255.255profiles {
/Common/fastL4 {}}serverssl-use-sni disabledsource 0.0.0.0/0translate-address enabledtranslate-port enabled} - C. ltm virtual /Common/app1_vs {creation-time 2020-02-07:09:47:12description https://app1.apmsupport.
localdestination /Common/10.155.47.160:443ip-protocol tcplast-modified-time 2024-05-15:09:57:
19mask 255.255.255.255pool /Common/https_lamp_poolprofiles {/Common/apm_support {context clientside}/Common/f5-tcp-progressive {}/Common/http {}/Common/multi_domain_ap {}/Common
/oneconnect {}/Common/rba {}/Common/serverssl {context serverside}/Common/websso {}}serverssl- use-sni disabledsource 0.0.0.0/0source-address-translation {type automap}translate-address enabledtranslate-port enabled} - D. ltm virtual /Common/vmware_test.app/vmware_test_proxy_https {app-service /Common/vmware_test.
app/vmware_testcreation-time 2024-04-12:08:49:12destination /Common/10.155.47.199:443ip- protocol tcplast-modified-time 2024-04-12:08:49:12mask 255.255.255.255profiles {/Common/ppp {}
/Common/rba {}/Common/vdi {}/Common/vmware_test.app/vmware_test {}/Common/vmware_test.
app/vmware_test_client_ssl {context clientside}/Common/vmware_test.app/vmware_test_connect
{context clientside}/Common/vmware_test.app/vmware_test_http {}/Common/vmware_test.app
/vmware_test_lan_optimized_tcp {context serverside}/Common/vmware_test.app
/vmware_test_server_ssl {context serverside}/Common/vmware_test.app
/vmware_test_wan_optimized_tcp {context clientside}/Common/websso {}}serverssl-use-sni disabledsource 0.0.0.0/0source-address-translation {type automap}translate-address enabledtranslate- port enabled}
Answer: D
Explanation:
An F5 iApp is a template-driven system used to deploy complex applications by grouping all necessary BIG- IP objects (Virtual Servers, Pools, Profiles) into a single management entity. Objects created by an iApp are distinguished by their naming convention and metadata. In the provided exhibit, the Virtual Server configuration in Option A is clearly identified as an iApp-managed object through two primary indicators.
First, the object resides within a sub-directory or partition ending in .app (/Common/vmware_test.app/).
Second, the configuration explicitly includes the attribute app-service /Common/vmware_test.app
/vmware_test, which serves as the system ' s internal pointer linking the LTM object back to the parent iApp Application Service. Furthermore, several profiles associated with this virtual server also reside within the same .app container, such as /Common/vmware_test.app/vmware_test_http.
In contrast, Options B, C, and D represent standard, manually created Virtual Servers. While they may have complex configurations (such as the APM profiles in app2_vs and app1_vs), they lack the folder-based naming hierarchy and the app-service metadata attribute that denotes iApp ownership. Standard objects like app1_vs are managed individually, whereas the objects within vmware_test.app are typically protected by " Strict Updates. " This means their configuration is controlled by the iApp ' s template logic; any manual attempt to modify these specific parameters directly via the Virtual Server menu would result in an error message stating the service must be updated via the application management interface. Identifying these objects is a critical procedural step for administrators to determine whether a configuration should be edited through the standard LTM menus or through the iApp ' s " Reconfigure " tab to ensure consistency and prevent manual changes from being overwritten by the template.
NEW QUESTION # 18
In a pool there are 2 pool members (older servers) that can handle fewer connections than the other 3 newer servers.
Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
- A. Global Availability
- B. Least Connections (member)
- C. Weighted Least Connections (member)
- D. Round Robin
Answer: C
Explanation:
This scenario requires unequal load distribution based on server capacity. The newer servers must receive more connections than the older ones, while still dynamically accounting for active connection counts.
According to BIG-IP Administration: Data Plane Configuration documentation:
Weighted Least Connections (member) combines:
Connection awareness (least connections)
Administrator-defined weights (ratios) to reflect server capacity
Pool members with higher weights receive proportionally more new connections than members with lower weights, even when using the same load balancing algorithm.
Why B is correct:
Allows assigning higher weights to newer servers and lower weights to older servers Ensures smarter traffic distribution based on both capacity and real-time load Why the other options are incorrect:
A . Global Availability
Used for disaster recovery and site failover, not intra-pool load distribution.
C . Round Robin
Distributes connections evenly without considering server capacity.
D . Least Connections (member)
Balances only by current connection count and does not account for differences in server performance or capacity.
Correct Resolution:
Use Weighted Least Connections (member) and assign higher weights to newer servers so they receive more traffic while protecting older servers from overload.
NEW QUESTION # 19
Which Virtual Server type prevents the use of a default pool?
- A. Performance (HTTP)
- B. Standard
- C. Performance (Layer 4)
- D. Forwarding (IP)
Answer: D
Explanation:
Forwarding (IP) virtual servers operate at Layer 3 and forward traffic based on routing, not pools.
NEW QUESTION # 20
A BIG-IP Administrator adds new pool members into a highly utilized pool. Users report application failures.
Which pool-level setting should be checked?
- A. Availability Requirement
- B. Allow SNAT
- C. Slow Ramp Time
- D. Action On Service Down
Answer: C
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
NEW QUESTION # 21
Refer to the exhibit.
A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers.
What should the BIG-IP Administrator do to resolve the issue? (Choose one answer)
- A. Set HTTP Profile to None
- B. Set Source Address to 10.1.1.2
- C. Set Protocol to UDP
- D. Set Destination Address/Mask to 0.0.0.0/0
Answer: A
Explanation:
SSH is a Layer 4 TCP-based protocol that operates on TCP port 22 and does not use HTTP in any capacity. In the exhibit, the Virtual Server is configured with an HTTP Profile applied, which is inappropriate for SSH traffic and causes connection failures.
According to the BIG-IP Administration: Data Plane Configuration documentation:
An HTTP profile must only be applied to Virtual Servers handling HTTP or HTTPS traffic.
When an HTTP profile is attached, BIG-IP expects HTTP headers and attempts to parse application-layer data.
Non-HTTP protocols such as SSH, FTP (control), SMTP, and other raw TCP services will fail if an HTTP profile is enabled.
Why the other options are incorrect:
A . Set Protocol to UDP
SSH uses TCP, not UDP. Changing the protocol would break SSH entirely.
B . Set Source Address to 10.1.1.2
The source address setting controls client access restrictions and is unrelated to protocol parsing issues.
C . Set Destination Address/Mask to 0.0.0.0/0
The destination address is already valid for a specific SSH service and does not impact protocol handling.
Correct Resolution:
The BIG-IP Administrator should remove the HTTP Profile (set it to None) so the Virtual Server functions as a pure Layer 4 TCP service, allowing SSH connections to pass through successfully.
NEW QUESTION # 22
A Standard Virtual Server for a web application is configured with Automap for Source Address Translation. The original client IP must be known by backend servers.
What should the BIG-IP Administrator configure?
- A. SNAT pool using client IP
- B. HTTP profile to insert X-Forwarded-For
- C. HTTP Transparent profile
- D. Performance (HTTP) Virtual Server
Answer: B
Explanation:
The X-Forwarded-For header preserves the original client IP when SNAT is enabled.
NEW QUESTION # 23
For a given Virtual Server, the BIG-IP must perform SSL Offload and negotiate secure communication over TLSv1.2 only. What should the BIG-IP Administrator do to meet this requirement?
- A. Configure a custom SSL Profile (Client) and select no TLSv1 in the options list
- B. Configure a custom SSL Profile (Server) with a custom TLSv1.2 cipher string
- C. Configure a custom SSL Profile (Client) with a custom TLSv1.2 cipher string
- D. Configure a custom SSL Profile (Server) and select no TLSv1 in the options list
Answer: C
Explanation:
To fulfill the requirement of "SSL Offload" limited to "TLSv1.2 only," the administrator must focus on the client-side of the connection. SSL Offload means the BIG-IP terminates the encrypted connection from the user, processes the traffic (often as plain text internally), and optionally sends it to the backend. The profile responsible for this termination and the initial negotiation with the client's browser is the Client SSL Profile.
A custom Client SSL Profile must be created because the default clientssl profile typically allows a broad range of protocols for compatibility (including TLS 1.0, 1.1, and 1.2). To restrict communication specifically to TLS 1.2, the administrator modifies the Ciphers string within the profile. Using a string such as DEFAULT:!SSLv3:!TLSv1:!TLSv1.1 or specifically defining TLSv1.2-only suites ensures that the BIG-IP will reject any handshake attempts from older, less secure protocols.
Server SSL Profiles (Options B and C) are used for the encryption between the BIG-IP and the backend nodes, which is not what is requested here. Simply selecting "no TLSv1" in an options list (Option D) is insufficient and often refers to older versions of the software; the modern and standard way to control protocol negotiation on a BIG-IP is through the precise application of Cipher Strings within the Client SSL profile. This ensures compliance with security standards like PCI-DSS while providing the offloading benefits to the backend infrastructure.
NEW QUESTION # 24
A configuration change is made on the standby member of a device group. What is displayed as " Recommended Action " on the Device Management Overview screen?
- A. Activate device with the most recent configuration
- B. Synchronize the active member configuration to the group
- C. Force active member of device group to standby
- D. Synchronize the standby member configuration to the group
Answer: D
Explanation:
The BIG-IP system uses a centralized management framework to ensure that all devices within a Sync- Failover group share a consistent configuration. When an administrator makes a change on any member of the group-whether it is the active or the standby device-the system detects a " ConfigSync " mismatch. The " Device Management > > Overview " screen tracks these changes by comparing the commit ID and timestamps of the configurations across all peers.
If a change is made on the standby member, that device now possesses a more recent configuration than the other members of the group. Consequently, the BIG-IP GUI will display a status of " Changes Pending " and suggest a Recommended Action to resolve the discrepancy. In this scenario, the correct action is to Synchronize the standby member configuration to the group. This push operation will copy the updated configuration from the standby device to the active device (and any other peers), bringing the entire cluster back into a " In Sync " status. It is important to note that BIG-IP allows bi-directional synchronization; you do not have to be on the active device to push a configuration. However, administrators must be cautious:
choosing Option C (Synchronizing the active member to the group) would overwrite the changes just made on the standby device with the older configuration from the active device, effectively reverting the changes. The Recommended Action always points toward the direction that propagates the most recent change to the rest of the group.
NEW QUESTION # 25
Exhibit:
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?
- A. Hash
- B. SSL
- C. Source Address Affinity
- D. Universal
Answer: C
Explanation:
In a BIG-IP environment, a Fallback Persistence Profile is utilized as a secondary "stickiness" mechanism when the primary (Default) persistence method fails to provide a valid persistence record. For example, if a Virtual Server uses HTTP Cookie Persistence as its primary method, but a client's browser has cookies disabled, the BIG-IP will be unable to find a persistence cookie in the request. Without a fallback method, the system would treat every request from that client as a new, independent connection, potentially breaking the application session.
Source Address Affinity (also known as Source Address Persistence) is the most common and standard choice for a fallback profile. It operates at the network layer (Layer 3) by tracking the client's source IP address.
Because every IP packet contains a source address, this method is virtually guaranteed to work even when application-layer data (like Cookies or SSL Session IDs) is missing or encrypted beyond the BIG-IP's visibility. While Universal (Option A) and Hash (Option D) profiles are highly flexible and can use iRules to persist on almost any data, they require specific configuration and logic that may not always be present or valid. SSL persistence (Option C) relies on the SSL Session ID, which frequently changes due to modern browser security practices (session renegotiation), making it less reliable than Source Address Affinity. By configuring Source Address Affinity as the fallback, the administrator ensures that the BIG-IP has a "safety net" to maintain session integrity based on the client's IP address when the more granular cookie-based persistence is unavailable.
NEW QUESTION # 26
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an interface to it.
Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?
- A. Enable the Interface that is attached to the new VLAN on Cluster Member A
- B. Configure a Default Route for the new VLAN on Cluster Member A
- C. Reset the Device Trust of the BIG-IP Cluster on either Cluster Member
- D. Configure the new VLAN manually on Cluster Member B
Answer: D
NEW QUESTION # 27
The BIG-IP Administrator has to provide encrypted communication between users and the virtual server they access. Multiple hostnames are configured in DNS with the same IP address.
Which profile type and setting in the profile should be used? (Choose one answer)
- A. Client SSL, Server Name
- B. Client SSL, Client Name
- C. Server SSL, Client Name
- D. Server SSL, Server Name
Answer: A
Explanation:
When multiple hostnames resolve to the same IP address and encrypted communication is required, the BIG- IP must be able to present the correct SSL certificate based on the hostname requested by the client. This is accomplished using Server Name Indication (SNI).
According to BIG-IP Administration: Data Plane Configuration documentation:
* SNI is a client-side TLS extension, where the client includes the requested hostname during the SSL handshake.
* BIG-IP evaluates this hostname using the Client SSL profile, not the Server SSL profile.
* The "Server Name" setting in the Client SSL profile enables BIG-IP to select the appropriate SSL certificate for the requested hostname.
Why option C is correct:
* Client SSL profile handles inbound (client-side) encryption.
* Server Name enables SNI-based certificate selection when multiple DNS names share the same virtual server IP.
Why the other options are incorrect:
* A. Client SSL, Client NameThere is no Client SSL setting called Client Name for SNI certificate selection.
* B. Server SSL, Server NameServer SSL is used for encryption between BIG-IP and backend servers, not for client-side hostname identification.
* D. Server SSL, Client NameServer SSL does not process client-requested hostnames during TLS negotiation.
Correct Resolution:
Configure a Client SSL profile and enable the Server Name (SNI) setting to support multiple encrypted hostnames on the same virtual server IP.
NEW QUESTION # 28
Local Traffic Network Map: VS_HTTP # POOL_WEB # 192.168.212.30:80 Pool Member | Parent Node
192.168.212.30 Port 80
Why is the virtual server unresponsive to incoming connections?
- A. The node monitor failed.
- B. The pool member is disabled.
- C. The node is disabled.
- D. The pool member monitor failed.
Answer: C
Explanation:
In the BIG-IP object hierarchy, a Pool Member is a child object of a Node . A pool member represents a specific IP:Port combination, while the parent node represents the underlying server IP address. When a node is disabled , all pool members that are children of that node are rendered unavailable - regardless of the individual pool member ' s own health or enabled state.
The Network Map depicted shows the pool member (192.168.212.30:80) with its Parent Node (192.168.212.30) disabled. This parent-child dependency means that even if the pool member itself is healthy and enabled, the disabled node cascades its unavailable state downward, causing the pool to have no available members and rendering VS_HTTP unresponsive to incoming connections.
The other options can be eliminated as follows:
* Pool member monitor failed - the monitor status is not indicated as failed in the Network Map display.
* Pool member is disabled - the pool member itself is not shown as disabled; the parent node is.
* Node monitor failed - no monitor failure is indicated; the node ' s administrative state is explicitly disabled.
Understanding the node-to-member inheritance of availability state is fundamental to accurate BIG-IP traffic troubleshooting.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Pool Members, Nodes, and Availability State Inheritance.
NEW QUESTION # 29
The BIG-IP Administrator is investigating whether better TCP performance is possible for a virtual server.
Which built-in profile should be tried first? (Choose one answer)
- A. f5-tcp-progressive
- B. No option
- C. f5-tcp-mobile
- D. f5-tcp-legacy
Answer: A
Explanation:
BIG-IP provides several built-in TCP profiles optimized for different traffic patterns and network conditions. When attempting to improve general TCP performance, the recommended starting point is f5-tcp-progressive.
According to the BIG-IP Administration: Data Plane Configuration documentation:
f5-tcp-progressive is designed as a balanced, general-purpose TCP optimization profile.
It dynamically adjusts TCP behavior to improve throughput and latency for most enterprise applications.
It is the recommended first-choice profile when tuning TCP performance before moving to more specialized profiles.
Why the other options are incorrect:
A . f5-tcp-legacy
This profile exists for backward compatibility and does not include modern TCP optimizations.
C . f5-tcp-mobile
This profile is optimized specifically for high-latency, lossy mobile networks and is not suitable for general-purpose environments.
D . No option
BIG-IP explicitly provides built-in TCP profiles for performance tuning; using none would forgo optimization opportunities.
Correct Resolution:
The administrator should first apply f5-tcp-progressive to evaluate potential TCP performance improvements before considering more specialized profiles.
NEW QUESTION # 30
An organization reports slow performance accessing an Intranet website. All employees use a single proxy IP.
What should the BIG-IP Administrator do?
- A. Change Source Address to proxy IP
- B. Change Fallback Persistence to source_addr
- C. Change Load Balancing to Least Connections
- D. Change Default Persistence to cookie
Answer: D
Explanation:
When many users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies clients at Layer 7.
NEW QUESTION # 31
A BIG-IP Administrator creates an HTTP Virtual Server using an iApp template. After the Virtual Server is created, the user requests to change the destination IP addresses. The BIG-IP Administrator tries to change the destination IP address from 10.1.1.1 to 10.2.1.1 in Virtual Server settings, but receives the following error: " The application service must be updated using an application management interface. " What is causing this error?
- A. The Application Service was NOT deleted before making the IP address change.
- B. The IP addresses are already in use.
- C. The Application Services have Strict Updates enabled.
- D. The IP addresses used are NOT from the same subnet as the Self IP.
Answer: C
Explanation:
In F5 BIG-IP administration, iApps are designed to manage complex application configurations as a single unit. When an iApp is deployed, it creates an " Application Service " object that owns all the associated LTM objects, such as Virtual Servers, Pools, and Nodes. By default, these iApps are created with Strict Updates enabled. Strict Updates is a safety mechanism that prevents administrators from making manual " out-of-band
" changes to the individual objects created by the iApp. The system enforces this because manual changes would be overwritten the next time the iApp template is updated or re-entered.
When the administrator attempts to change the destination IP address directly on the Virtual Server object, the BIG-IP system checks the " Strict Updates " flag. If it is set to " Enabled, " the system blocks the modification and generates the error message stating the service must be updated via the application management interface.
To resolve this, the administrator must navigate to the iApp > > Application Services menu, select the specific application service, and go to the " Reconfigure " tab. Within the iApp configuration form, the destination IP can be safely changed. Alternatively, if the administrator specifically wants to manage the objects manually and forgo the benefits of the iApp template management, they could disable " Strict Updates " in the iApp properties, though this is generally discouraged as it breaks the template ' s logic. The error is not related to subnetting or duplicate IPs, but strictly to the configuration authority assigned to the iApp service.
NEW QUESTION # 32
Refer to the exhibit.
DNS queries from two internal DNS servers are being load-balanced to external DNS servers via a virtual server on a BIG-IP device. The DNS queries originate from:
192.168.10.100
192.168.10.200
and target:
192.168.2.150
All DNS queries destined for the external DNS servers fail.
Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?
(Choose one answer)
- A. Type to Performance (HTTP)
- B. Protocol profile (Client) to DNS_OPTIMIZED
- C. Source Address to 192.168.10.0/24
- D. Protocol to UDP
Answer: D
Explanation:
DNS traffic is primarily transported using UDP port 53. In the exhibit, the Virtual Server is configured with the Protocol set to TCP, which prevents standard DNS queries from being processed correctly. BIG-IP Virtual Servers must be configured with the correct Layer 4 protocol to match the application traffic they are handling.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* The Protocol setting on a Virtual Server defines whether traffic is processed as TCP, UDP, or another supported transport protocol.
* Standard DNS queries and responses use UDP, while TCP is only required for DNS zone transfers (AXFR) or exceptionally large responses.
* When a DNS Virtual Server is incorrectly configured with TCP, UDP-based DNS queries are dropped, causing all requests to fail.
Why the other options are incorrect:
* A. Protocol profile (Client) to DNS_OPTIMIZEDA DNS profile enhances DNS functionality but does not correct an incorrect transport protocol configuration.
* B. Type to Performance (HTTP)Performance (HTTP) Virtual Servers are designed for HTTP traffic and are not suitable for DNS services.
* C. Source Address to 192.168.10.0/24The existing source IPs already fall within the allowed range, so this setting does not address the failure.
Correct Resolution:
Changing the Protocol to UDP aligns the Virtual Server with standard DNS transport requirements, allowing DNS queries to be successfully processed and load-balanced.
NEW QUESTION # 33
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers.
Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server? (Choose one answer)
- A. Least Connections (member)
- B. Predictive (node)
- C. Predictive (member)
- D. Least Connections (node)
Answer: D
Explanation:
In this scenario, each backend node (server) hosts multiple services and is referenced by multiple pools and virtual servers. The goal is to ensure an equal number of total connections per backend server, regardless of how many pool members (services/ports) exist on that server.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Least Connections (node) tracks the total number of active connections to a node across all pool members and services.
This algorithm ensures load distribution is balanced at the server level, not just at the individual service (member) level.
It is specifically recommended when:
Multiple pool members exist on the same backend server
Multiple virtual servers reference the same backend servers
Why the other options are incorrect:
B . Predictive (member)
Predictive algorithms are advanced and traffic-pattern based, but they operate at the member level and do not guarantee equal connections per server.
C . Least Connections (member)
This balances connections per pool member, which can overload a server hosting multiple members while still appearing "balanced" per member.
D . Predictive (node)
Although node-aware, predictive algorithms are less deterministic and not the best choice when strict equality of connections is required.
Correct Resolution:
Using Least Connections (node) ensures that each backend server carries an equal connection load across all services and pools.
NEW QUESTION # 34
A node is a member of multiple pools and hosts different applications. If one application becomes unavailable, only that pool member should be marked down.
What should the BIG-IP Administrator deploy?
- A. TCP monitor
- B. HTTP monitor with custom send/receive
- C. UDP monitor
- D. ICMP + TCP monitor
Answer: B
Explanation:
Application-level monitors ensure that only the affected service is marked down, not the entire node.
NEW QUESTION # 35
Which two load balancing methods consider all the connections the BIG-IP has between it and each backend application server (Pool Member) when making a load balancing decision for a new connection?
- A. Weighted Least Connections (node)
- B. Ratio (member)
- C. Least Connections (node)
- D. Round Robin
Answer: A,C
Explanation:
The two load balancing methods that consider all connections between the BIG-IP and each backend node
- not just connections to a specific pool member - are Least Connections (node) and Weighted Least Connections (node) .
The critical distinction here lies in the node-level scope of evaluation. A node represents the backend server ' s IP address, regardless of how many services or ports it may be serving. Therefore:
* Least Connections (node) directs new connections to the node with the fewest total active connections across all services on that server, providing a holistic connection-count perspective.
* Weighted Least Connections (node) operates identically but factors in an administrator-defined ratio weight, allowing servers with greater capacity to proportionally absorb more connections while still evaluating total node-level connection counts.
By contrast:
* Ratio (member) distributes traffic based on a static weight ratio and does not dynamically evaluate current connection counts.
* Round Robin distributes traffic sequentially in rotation, completely ignoring current connection states on any node or member.
The node-based methods are particularly valuable in environments where a single backend server hosts multiple pool members across different ports, ensuring the server ' s overall load - not just per-service load
- governs balancing decisions.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Load Balancing Methods - Member vs. Node Scope.
NEW QUESTION # 36
A BIG-IP Administrator finds the following log entry after a report of user issues connecting to a virtual server:
01010201: Intercept exhaustion on 10.70.110.112 to 192.28.123.250:80 (proto 6) How should the BIG-IP Administrator modify the SNAT pool that is associated with the virtual server?
(Choose one answer)
- A. Add an IP address to the SNAT pool
- B. Increase the timeout of the SNAT addresses
- C. Remove the SNAT pool and apply SNAT Automap
- D. Remove an IP address from the SNAT pool
Answer: A
Explanation:
The log message "Intercept exhaustion" indicates that the BIG-IP system has exhausted the available source port translations for one or more SNAT addresses. This occurs when too many concurrent client connections are being translated through a limited number of SNAT IP addresses, and all ephemeral source ports (typically ~64,000 per SNAT IP) are in use.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Each SNAT IP address provides a finite number of available source ports.
* When the number of concurrent connections exceeds the available port space, the BIG-IP logs an Intercept exhaustion error and new connections fail.
* The recommended resolution is to increase the available SNAT resources by adding additional IP addresses to the SNAT pool.
Why the other options are incorrect:
* A. Increase the timeout of the SNAT addressesIncreasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.
* B. Remove the SNAT pool and apply SNAT AutomapSNAT Automap uses the Self IP addresses on the egress VLAN, which may not provide additional capacity and can introduce routing or design issues.
This is not a direct or recommended fix for SNAT exhaustion.
* C. Remove an IP address from the SNAT poolThis would reduce the number of available source ports and further exacerbate the intercept exhaustion condition.
Correct Resolution:
By adding an IP address to the SNAT pool, the BIG-IP increases the total number of available source ports, alleviating intercept exhaustion and restoring successful client connections.
NEW QUESTION # 37
Refer to the exhibit.
A BIG-IP Administrator needs to configure health monitors for a newly configured server pool named Pool_B. Which health monitor settings will ensure that all pool members will be accurately marked as available or unavailable?
- A. HTTPS, HTTP, FTP, and ICMP, with the Availability Requirement of all health monitors
- B. HTTPS, HTTP, FTP, and SSH, with the Availability Requirement of at least one monitor
- C. HTTPS and HTTP with the Availability Requirement of at least one health monitor
- D. HTTPS, HTTP, FTP, and SSH with the Availability Requirement of all health monitors
Answer: B
Explanation:
The pool member list in the exhibit shows servers listening on four distinct service ports: 80 (HTTP), 21 (FTP), 443 (HTTPS), and 22 (SSH). To accurately monitor a pool where members provide different services, the administrator must apply monitors that correspond to each of those specific services.
The key to this configuration is the Availability Requirement (also known as " Monitor Rule " ). If the administrator sets the requirement to " All health monitors, " every single monitor (HTTP, HTTPS, FTP, and SSH) must pass for a member to be marked " Up. " This would cause an immediate failure: for example, a server listening only on port 80 would fail the HTTPS, FTP, and SSH checks, resulting in the member being marked " Down " even if the HTTP service is healthy.
To ensure accuracy, the administrator should apply all four relevant monitors and set the Availability Requirement to at least one monitor. With this setting, the BIG-IP marks a member as " Up " if any of the assigned monitors return a successful response. Therefore, the member at 10.200.50.210:80 will stay " Up " as long as the HTTP monitor passes, even though it fails the FTP, HTTPS, and SSH monitors. This configuration allows a single pool to contain diverse service types while ensuring that the specific port defined for each member is verified correctly. Option C is incorrect because ICMP only checks if the IP is alive, not if the specific service port is functioning.
NEW QUESTION # 38
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