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F5CAB3 Free Certification Exam Material with 84 Q&As
NEW QUESTION # 23
What is the status of a pool member when manual resume is enabled and a health check first fails and then passes?
- A. Available (Disabled)
- B. Offline (Enabled)
- C. Offline (Disabled)
- D. Available (Enabled)
Answer: C
Explanation:
With manual resume enabled, BIG-IP does not automatically return a pool member to service after recovery.
The member remains offline until manually re-enabled.
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. Synchronize the active member configuration to the group
- B. Activate device with the most recent configuration
- 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
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 SSL Profile (Server)
- B. Configure Service Port to HTTP
- C. Configure SSL Profile (Client)
- D. Configure Protocol Profile (Server)
Answer: C
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 # 26
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 Load Balancing to Least Connections
- B. Change Source Address to proxy IP
- C. Change Default Persistence to cookie
- D. Change Fallback Persistence to source_addr
Answer: C
Explanation:
When many users share one source IP, source-address persistence fails. Cookie persistence uniquely identifies clients at Layer 7.
NEW QUESTION # 27
Which persistence profile would be the most appropriate to ensure an HTTP web request connects to the same pool member? (Choose one answer)
- A. Hash persistence
- B. SSL persistence
- C. Destination address
- D. Cookie persistence
Answer: D
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 # 28
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. Round Robin
- B. Least Connections (member)
- C. Global Availability
- D. Weighted Least Connections (member)
Answer: D
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 # 29
All pool members are online. All other virtual server settings are at default.
What might alter the load balancing behavior? (Choose one answer)
- A. Enabling SNAT automap
- B. Enabling a fallback host in the HTTP profile
- C. Adding a OneConnect profile
- D. Adding a persistence profile
Answer: D
Explanation:
By default, BIG-IP load balancing algorithms (such as Round Robin) distribute connections evenly across all available pool members. However, persistence profiles override normal load balancing decisions by forcing subsequent connections from a client to be sent to the same pool member.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Persistence creates a client-to-server mapping that is honored before load balancing algorithms are applied.
When persistence is enabled, BIG-IP may repeatedly select the same pool member even if others are available.
This directly alters load balancing behavior.
Why the other options are incorrect:
A . Adding a OneConnect profile
OneConnect optimizes server-side TCP connections but does not change which pool member is selected.
B . Enabling SNAT automap
SNAT affects source address translation, not pool member selection.
C . Enabling a fallback host in the HTTP profile
A fallback host is only used when no pool members are available.
Correct Resolution:
Adding a persistence profile alters load balancing behavior by maintaining client affinity to a specific pool member.
NEW QUESTION # 30
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 profile to insert the X-Forward-For header
- B. The Virtual Server type as Performance (HTTP)
- C. An HTTP Transparent profile
- D. A SNAT Pool with the client IP
Answer: A
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 # 31
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, HTTP, FTP, and SSH with the Availability Requirement of all health monitors
- D. HTTPS and HTTP with the Availability Requirement of at least one health monitor
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 # 32
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. Allow SNAT
- B. Slow Ramp Time
- C. Availability Requirement
- D. Action On Service Down
Answer: B
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
NEW QUESTION # 33
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?
- A. Set up Failover Method to HA Order
- B. Configure MAC Masquerade
- C. Configure a global SNAT Listener
- D. Enable Failover Multicast Configuration
Answer: B
Explanation:
When a failover occurs in a standard BIG-IP High Availability (HA) pair, the newly active device takes over the floating IP addresses (Virtual Servers, Self IPs). By default, the new active device sends Gratuitous ARP (GARP) messages to the local network switch to inform it that these IP addresses are now associated with its own physical MAC addresses. However, network switches and intermediate routers often have ARP aging timers or security features that may delay the updating of their ARP tables, leading to "black-holed" traffic or dropped packets for several seconds or minutes until the network infrastructure correctly relearns the new path.
To eliminate this delay and ensure a seamless transition, a BIG-IP Administrator should Configure MAC Masquerade. MAC Masquerade allows the administrator to assign a unique, "virtual" MAC address to a specific traffic group. Instead of using the hardware-burned MAC address of the individual appliance, the active device uses this shared virtual MAC address for all communication involving floating IPs. When a failover occurs, the standby device assumes control of the traffic group and begins using the exact same virtual MAC address. Because the MAC address associated with the VIPs never changes from the switch's perspective, there is no need for the switch to update its MAC address table or for the surrounding infrastructure to update its ARP caches. This effectively eliminates the "stabilization period" reported by users, as the data plane transition happens almost instantaneously at Layer 2, maintaining continuous traffic flow without being hindered by external network re-convergence times.
NEW QUESTION # 34
Which persistence profile would be the most appropriate to ensure an HTTP web request connects to the same pool member? (Choose one answer)
- A. Hash persistence
- B. SSL persistence
- C. Destination address
- D. Cookie persistence
Answer: D
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 # 35
A virtual server is configured to offload SSL from a pool of backend servers. When users connect to the virtual server, they successfully establish an SSL connection but no content is displayed. A packet trace performed on the server shows that the server receives and responds to the request. What should a BIG-IP Administrator do to resolve the problem? (Choose one answer)
- A. enable Server SSL profile
- B. disable SNAT
- C. enable SNAT
- D. disable Server SSL profile
Answer: C
Explanation:
This scenario describes a classic case of asymmetric routing in a "one-arm" or non-gateway deployment.
When a BIG-IP system is configured for SSL offloading, the following traffic flow occurs:
Client-Side: The client establishes a successful SSL/TLS handshake with the Virtual Server. This explains why the user can "successfully establish an SSL connection." Server-Side: The BIG-IP decrypts the traffic and forwards it as plain HTTP to the backend server. The packet trace confirms the server receives the HTTP GET request and responds with the content.
The Routing Failure: By default, the BIG-IP system preserves the client's original source IP address. If the backend server's default gateway is not the BIG-IP system (or if the server is on the same subnet as the client), the server will attempt to send the response directly back to the client's IP address, bypassing the BIG-IP.
Stateful Drop: Because the BIG-IP is a Full Proxy, it expects the response to return through its own internal state table to be encrypted and sent back to the client. Since the response bypasses the BIG-IP, the BIG-IP connection eventually times out, and the client receives no data despite the server having sent it.
Solution (SNAT): Enabling Secure Network Address Translation (SNAT), specifically SNAT Auto Map, ensures that the BIG-IP replaces the client's source IP with its own internal self-IP before sending the request to the server. This forces the server to send the response back to the BIG-IP, allowing the BIG-IP to complete the transaction and deliver the content to the user.
NEW QUESTION # 36
A BIG-IP Administrator adds new pool members to a highly utilized pool. The application begins failing.
What pool-level setting should be checked?
- A. Allow SNAT
- B. Slow Ramp Time
- C. Availability Requirement
- D. Action On Service Down
Answer: B
Explanation:
Slow Ramp Time prevents new members from being overwhelmed immediately after activation.
NEW QUESTION # 37
During a high-demand event, the BIG-IP Administrator needs to limit the number of new connections per second to a Virtual Server.
What should be applied?
- A. Connection Limit
- B. OneConnect profile
- C. Connection Rate Limit
- D. HTTP Compression profile
Answer: C
Explanation:
Connection rate limits restrict how many new connections are accepted per second, protecting application resources.
NEW QUESTION # 38
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 profile to insert the X-Forward-For header
- B. The Virtual Server type as Performance (HTTP)
- C. An HTTP Transparent profile
- D. A SNAT Pool with the client IP
Answer: A
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 # 39
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. HTTP profile with X-Forwarded-For
- B. SNAT pool using client IP
- C. Performance (HTTP) Virtual Server
- D. HTTP Transparent profile
Answer: A
Explanation:
X-Forwarded-For inserts the original client IP into HTTP headers while SNAT is enabled.
NEW QUESTION # 40
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