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F5CAB3 Braindumps Real Exam Updated on Jun 06, 2026 with 76 Questions
F5 F5CAB3 Exam Syllabus Topics:
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NEW QUESTION # 32
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. SSL
- B. Source Address Affinity
- C. Hash
- D. Universal
Answer: B
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 # 33
The BIG-IP Administrator needs to load balance a pool of web servers. Load balancing should consider the number of connections that are active on that pool member.
Which load balancing method meets this requirement? (Choose one answer)
- A. Ratio (node)
- B. Round Robin
- C. Ratio (member)
- D. Least Connections (member)
Answer: D
Explanation:
The requirement states that load balancing decisions must be based on the number of active connections on each pool member. This directly maps to the Least Connections (member) load balancing method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Least Connections (member) selects the pool member with the fewest active connections at the time of the request.
* This method dynamically adapts to real-time traffic patterns and ensures that more heavily loaded pool members receive fewer new connections.
* It is especially effective for web servers where connection duration may vary and equal distribution of active sessions is desired.
Why the other options are incorrect:
* B. Round RobinDistributes connections sequentially without considering current load or active connections.
* C. Ratio (member)Distributes traffic based on static ratios, not real-time connection counts.
* D. Ratio (node)Uses predefined ratios at the node level and does not account for active connection counts.
Correct Resolution:
Using Least Connections (member) ensures that new connections are directed to the pool member currently handling the fewest active connections, meeting the stated requirement.
NEW QUESTION # 34
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. Remove an IP address from the SNAT pool
- B. Remove the SNAT pool and apply SNAT Automap
- C. Increase the timeout of the SNAT addresses
- D. Add an IP address to the SNAT pool
Answer: D
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 addresses
Increasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.
B . Remove the SNAT pool and apply SNAT Automap
SNAT 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 pool
This 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 # 35
An organization is reporting slow performance accessing their Intranet website. All employees use a single Proxy Server with a public IP.
What should the BIG-IP Administrator do to fix this issue?
- A. Change Fallback Persistence Profile to source_addr
- B. Change Default Persistence Profile to cookie
- C. Change Source Address to proxy IP
- D. Change Load Balancing Method to Least Connections
Answer: B
Explanation:
When multiple users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies users at Layer 7 and ensures correct session handling.
NEW QUESTION # 36
Which persistence profile would be the most appropriate to ensure an HTTP web request connects to the same pool member? (Choose one answer)
- A. Cookie persistence
- B. SSL persistence
- C. Hash persistence
- D. Destination address
Answer: A
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 address
Destination address persistence is generally used for inbound traffic patterns such as firewall or proxy scenarios.
B . Hash persistence
Hash persistence is less granular and not HTTP-specific.
C . SSL persistence
SSL 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 # 37
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. No option
- B. f5-tcp-legacy
- C. f5-tcp-progressive
- D. f5-tcp-mobile
Answer: C
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-legacyThis profile exists for backward compatibility and does not include modern TCP optimizations.
* C. f5-tcp-mobileThis profile is optimized specifically for high-latency, lossy mobile networks and is not suitable for general-purpose environments.
* D. No optionBIG-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 # 38
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. Weighted Least Connections (member)
- B. Global Availability
- C. Round Robin
- D. Least Connections (member)
Answer: A
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 AvailabilityUsed for disaster recovery and site failover, not intra-pool load distribution.
* C. Round RobinDistributes 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 # 39
Application administrators are reporting that nodes different from those configured in the pool are selected.
The use of an iRule is suspected.
How can the BIG-IP Administrator check if an iRule is used for this traffic? (Choose two answers)
- A. Via the GUI at the Resources tab for the virtual server.
- B. Via the GUI at the iRule tab for the virtual server.
- C. Via TMSH with the list /ltm rule <irule> command.
- D. Via TMSH with the list /ltm virtual <virtual_server> command.
Answer: A,D
Explanation:
In BIG-IP systems, iRules influence traffic only when they are attached to a Virtual Server. If application traffic is being sent to nodes or pool members that are not defined in the pool, this typically indicates that an iRule is overriding the default load-balancing behavior by explicitly selecting a pool or node.
According to BIG-IP Administration: Data Plane Configuration and official F5 guidance:
* iRules are associated with Virtual Servers, not directly with pools or nodes.
* To determine whether an iRule is actively affecting traffic, the administrator must inspect the Virtual Server configuration.
Explanation of the correct answers:
* B. Via the GUI at the Resources tab for the virtual serverThe Resources tab in the Configuration Utility displays all traffic-handling objects applied to the Virtual Server, including assigned iRules. This is the primary GUI location to verify whether an iRule is influencing data plane traffic.
* C. Via TMSH with the list /ltm virtual <virtual_server> commandThis TMSH command displays the full Virtual Server configuration, including any iRules listed under the rules section. It is the authoritative CLI method to confirm iRule usage.
Why the other options are incorrect:
* A. Via TMSH with the list /ltm rule <irule> commandThis command only shows the contents of an iRule and does not indicate whether the iRule is attached to or used by any Virtual Server.
* D. Via the GUI at the iRule tab for the virtual serverBIG-IP does not provide a dedicated "iRule" tab on Virtual Servers. iRules are viewed and managed under the Resources tab.
Correct Conclusion:
To verify whether an iRule is responsible for unexpected node selection, the BIG-IP Administrator must examine the Virtual Server configuration, either through the Resources tab in the GUI or by using TMSH to list the Virtual Server configuration.
NEW QUESTION # 40
Users are unable to reach an application. The Virtual Server shows a red diamond status in the Configuration Utility.
What is the cause?
- A. All pool members are disabled
- B. Virtual Server is disabled
- C. HTTPS traffic sent to HTTP Virtual Server
- D. All pool members are down
Answer: D
Explanation:
A red diamond indicates the Virtual Server is enabled but unavailable due to all pool members being down.
NEW QUESTION # 41
A BIG-IP Administrator needs to apply persistence to a virtual server that is configured as a Performance (Layer 4) virtual server that allows access to a secure (TLS) e-commerce website.
What type of persistence profile can be used? (Choose one answer)
- A. Microsoft RDP persistence
- B. Source Address Affinity
- C. Cookie persistence
- D. Host persistence
Answer: B
Explanation:
A Performance (Layer 4) virtual server does not inspect or process application-layer data such as HTTP headers or cookies. Therefore, only Layer 4-compatible persistence methods can be used.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Source Address Affinity persistence operates at Layer 4 and uses the client IP address to maintain session persistence.
It is fully compatible with Performance (Layer 4) virtual servers.
It works regardless of encryption, making it suitable for TLS-secured applications.
Why the other options are incorrect:
B . Cookie persistence
Requires an HTTP profile and Layer 7 inspection, which is not supported on Performance virtual servers.
C . Microsoft RDP persistence
Is protocol-specific and not applicable to web-based TLS traffic.
D . Host persistence
Requires HTTP host header inspection, which is not available at Layer 4.
Correct Resolution:
Source Address Affinity persistence is the appropriate choice for maintaining persistence on a Performance (Layer 4) virtual server handling TLS traffic.
Below is Batch 1 (Questions 1-10) extracted only from your uploaded document that are directly related to BIG-IP Administration: Data Plane Configuration topics (Virtual Servers, Pools, Load Balancing, Monitors, Persistence, SNAT, Profiles).
I have excluded system-only, licensing, support, hardware, HA management-only, and admin UI questions that are not Data Plane-focused.
Source: Your uploaded TMOS Administration v2.0 document
✅ BATCH 1 (10 Questions)
NEW QUESTION # 42
Users are unable to reach an application. The Virtual Server shows a red diamond status.
What is the cause?
- A. Virtual Server disabled
- B. Pool members disabled
- C. All pool members are down
- D. HTTPS traffic sent to HTTP VS
Answer: C
Explanation:
A red diamond indicates that the Virtual Server is enabled but unavailable, typically due to all pool members being down.
NEW QUESTION # 43
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. HTTP Transparent profile
- B. Performance (HTTP) Virtual Server
- C. HTTP profile to insert X-Forwarded-For
- D. SNAT pool using client IP
Answer: C
Explanation:
The X-Forwarded-For header preserves the original client IP when SNAT is enabled.
NEW QUESTION # 44
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 Default Persistence to cookie
- B. Change Fallback Persistence to source_addr
- C. Change Source Address to proxy IP
- D. Change Load Balancing to Least Connections
Answer: A
Explanation:
When many users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies clients at Layer 7.
NEW QUESTION # 45
Which of the following has iApp configured objects?
- A. 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} - 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/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} - D. 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}
Answer: A
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 # 46
Which type of Virtual Server requires the use of a FastL4 profile?
- A. Performance (HTTP)
- B. Standard
- C. Stateless
- D. Performance (Layer 4)
Answer: D
Explanation:
Performance (Layer 4) virtual servers rely on FastL4 profiles for high-speed Layer 4 traffic handling.
NEW QUESTION # 47
Refer to the exhibit.
A BIG-IP Administrator configures a Virtual Server to handle HTTPS traffic. Users report that the application is NOT working. Which additional configuration is required to resolve this issue?
- A. Configure Protocol Profile (Server)
- B. Configure SSL Profile (Server)
- C. Configure Service Port to HTTP
- D. Configure SSL Profile (Client)
Answer: D
Explanation:
According to the provided exhibit, the "SSL Profile (Client)" section in the Virtual Server configuration is empty. For a BIG-IP system to process HTTPS traffic, it must act as an SSL/TLS endpoint. This process, known as SSL Termination or SSL Offload, requires the assignment of a Client SSL Profile to the Virtual Server. Without this profile, the BIG-IP does not have the necessary certificate and private key information to perform the SSL handshake with the client's browser. Consequently, when a user attempts to connect via HTTPS, the TCP connection may establish, but the SSL handshake will fail because the BIG-IP will not know how to decrypt the incoming encrypted packets.
A Client SSL profile defines the ciphers, certificates, and keys that the BIG-IP uses to communicate securely with the client. In a standard HTTPS deployment, the BIG-IP decrypts the traffic and can then send it to the backend pool members either as plain text (header insertion/manipulation) or re-encrypt it using a Server SSL profile. While a Server SSL profile (Option C) is needed if the backend servers themselves require HTTPS, the initial failure for a user reaching a Virtual Server is almost always the lack of a Client SSL profile to terminate the user's connection. Changing the Service Port to HTTP (Option D) would be incorrect because the goal is to handle HTTPS traffic (typically port 443). Assigning the "clientssl" or a custom client-side profile from the "Available" list to the "Selected" list in the GUI is the mandatory step to make the Virtual Server operational for secure web traffic.
NEW QUESTION # 48
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 Source Address to 10.1.1.2
- B. Set Protocol to UDP
- C. Set HTTP Profile to None
- D. Set Destination Address/Mask to 0.0.0.0/0
Answer: C
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 # 49
The BIG-IP Administrator is investigating if better TCP performance is possible for a virtual server. Which built-in profile should be tried first?
- A. f5-tcp-wan
- B. f5-tcp-legacy
- C. f5-tcp-progressive
- D. f5-tcp-mobile
Answer: C
Explanation:
F5 provides several pre-configured (built-in) TCP profiles designed to optimize traffic for different network conditions. When an administrator is looking to improve general performance but does not have a specific, narrow use case (like strictly mobile or strictly long-haul WAN), the f5-tcp-progressive profile is the recommended starting point.
The f5-tcp-progressive profile is designed as a modern, high-performance replacement for the older default TCP settings. It incorporates several advanced congestion control algorithms and buffer management techniques that allow it to adapt dynamically to varying network latencies and packet loss scenarios. Unlike f5-tcp-legacy (Option A), which uses older, less efficient stacks, the progressive profile leverages modern TMM (Traffic Management Microkernel) optimizations.
While f5-tcp-mobile (Option B) is highly effective for high-loss cellular networks and f5-tcp-wan (Option D) is optimized for high-latency long-distance links, they can sometimes be too aggressive or poorly suited for standard campus or data center environments. The f5-tcp-progressive profile acts as a "best-of-all-worlds" template that typically provides an immediate performance boost for most web applications by improving window scaling and fast-retransmit behavior. Therefore, it is the procedural "first step" in TCP performance tuning before moving to more specialized, niche profiles.
NEW QUESTION # 50
In a pool there are 2 pool members out of the 5 members that are older servers. The number of connections these can handle is less than the other 3 pool members. Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
- A. Weighted Least Connections (member)
- B. Global Availability
- C. Round Robin
- D. Least Connections (member)
Answer: A
Explanation:
When a pool contains servers with heterogeneous hardware capabilities (differing CPU, RAM, or connection limits), a static load balancing method like Round Robin is ineffective because it distributes requests equally, regardless of the server's capacity. To optimize traffic distribution for newer, more powerful servers, a dynamic or weighted method is required.
* Weighted Least Connections (member): This is the ideal method for this scenario. It combines two factors:
* Least Connections: It first checks the current active connection count to ensure traffic goes to the least busy server.
* Weight (Ratio): It allows the administrator to assign a "Ratio" value to each pool member. Newer servers can be assigned a higher ratio (e.g., 3) while older servers are assigned a lower ratio (e.g.,
1). The BIG-IP system uses these weights to disproportionately favor the newer servers even when connection counts are similar.
* Why other options are incorrect:
* Global Availability: This is primarily a GSLB (Global Server Load Balancing) or specific LTM priority group concept where traffic is sent to the first available member in a list until it fails, then moves to the next. It does not load balance based on capacity.
* Round Robin: This passes each new connection request to the next server in line, treating the old and new servers exactly the same.
* Least Connections (member): While this sends traffic to the server with the fewest active connections, it assumes all servers are equal. If an old server and a new server both have 10 connections, they are treated as equally capable of taking the 11th, which is not true in this scenario.
NEW QUESTION # 51
A Standard Virtual Server for a web application is configured with Automap for the Source Address Translation option. The original source address of the client must be known by the backend servers. What should the BIG-IP Administrator configure to meet this requirement?
- A. An HTTP Transparent profile
- B. An HTTP profile to insert the X-Forward-For header
- C. A SNAT Pool with the client IP
- D. The Virtual Server type as Performance (HTTP)
Answer: B
Explanation:
SNAT Automap is a common configuration that replaces the client's original source IP address with one of the BIG-IP's self IP addresses. This ensures that the backend servers send return traffic back through the BIG- IP, which is necessary for the ADC to process the traffic correctly. However, a side effect of SNAT is that the backend servers only see the BIG-IP's IP in their logs, losing visibility into the true identity of the client.
To resolve this while still using SNAT for routing purposes, the administrator must configure the BIG-IP to
"pass" the client's IP address at the application layer. This is achieved by using an HTTP Profile with the Insert X-Forwarded-For setting enabled. When this profile is applied to the Virtual Server, the BIG-IP intercepts the HTTP request, adds a header (X-Forwarded-For) containing the client's original IP, and then forwards the modified request to the server. The backend web server can then be configured to read this header and log the original client IP instead of the BIG-IP's SNAT address.
Other options are incorrect for this requirement. Performance (HTTP) (Option A) is a virtual server type optimized for speed but often lacks the full Layer 7 header manipulation capabilities of a Standard Virtual Server. SNAT Pool with the client IP (Option C) is technically impossible as SNAT pools use static, pre- defined IPs. There is no such thing as an HTTP Transparent profile (Option D) in standard BIG-IP administration for this purpose. The X-Forwarded-For header insertion within the HTTP profile is the standard procedural method for maintaining client visibility in SNAT-enabled environments.
NEW QUESTION # 52
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. Action On Service Down
- B. Allow SNAT
- C. Slow Ramp Time
- D. Availability Requirement
Answer: C
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
NEW QUESTION # 53
A BIG-IP Administrator adds new pool members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users.
What pool-level setting should the BIG-IP Administrator check?
- A. Action On Service Down
- B. Allow SNAT
- C. Slow Ramp Time
- D. Availability Requirement
Answer: C
Explanation:
Slow Ramp Time prevents new pool members from receiving a full share of traffic immediately, allowing applications to warm up gradually.
NEW QUESTION # 54
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. Remove an IP address from the SNAT pool
- B. Remove the SNAT pool and apply SNAT Automap
- C. Increase the timeout of the SNAT addresses
- D. Add an IP address to the SNAT pool
Answer: D
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 # 55
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