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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Modify and Manage Pools | 50% | - Configure load balancing methods - Set priority groups and service port configurations - Implement health monitors for pools - Configure and modify pool settings |
| Topic 2: Modify and Manage Virtual Servers | 50% | - Verify pool configurations associated with virtual servers - Configure and modify virtual server properties - Configure encryption and protocol profiles - Identify and work with iApp objects and iRules - Apply persistence profiles |
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NEW QUESTION # 12
A set of servers is used for an FTP application as well as an HTTP website via separate BIG-IP Pools. The server support team reports that some servers are receiving a lot more traffic than others. Which Load Balancing Method should the BIG-IP Administrator apply to even out the connection count?
Answer: C
Explanation:
Similar to the logic required for managing multi-service backend environments, the issue described-where servers hosting multiple protocols like FTP and HTTP are experiencing uneven distribution-stems from the BIG-IP's default behavior of treating each pool independently. If the administrator uses a member-based load balancing method, the BIG-IP distributes HTTP traffic regardless of how much FTP traffic that same physical server is currently processing.
To resolve this, the administrator must utilize the Least Connections (Node) method. By switching both the HTTP and FTP pools to this algorithm, the BIG-IP begins to make load balancing decisions based on the total combined connection count for the IP address of each server. When a new HTTP request arrives, the BIG-IP checks which server has the fewest total connections (including existing FTP sessions). This prevents a server that is already busy with long-lived FTP transfers from being overwhelmed by a sudden burst of HTTP requests.
Ratio methods (Options A and C) are static and rely on the administrator manually assigning weights to servers based on their perceived capacity; they do not adapt to real-time fluctuations in traffic volume across different pools. Least Connections (Member) (Option B) remains blind to the "cross-pool" traffic on the same hardware. Only the Node-based Least Connections approach provides the global visibility necessary to "even out" the total resource utilization across servers supporting multiple distinct applications.
NEW QUESTION # 13
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?
Answer: C
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 # 14
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?
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 # 15
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)
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-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 # 16
A web server administrator informs the BIG-IP Administrator that web servers currently load-balanced require encrypted traffic. Starting next month, the web server administrator will offload SSL. Starting next month, the BIG-IP device will terminate SSL to reduce web server load. The BIG-IP device is already using Client SSL, Client port, and iRules on HTTP traffic. What actions should the BIG-IP Administrator take to achieve the desired configuration? (Choose one answer)
Answer: B
Explanation:
To solve this requirement, we must distinguish between the two "legs" of an SSL connection in a BIG-IP environment: Client-side and Server-side.
* Current State (SSL Bridging): The administrator states the servers currently require encrypted traffic.
This means the BIG-IP is likely performing "SSL Bridging." In this setup, a Client SSL profile terminates encryption from the user, and a Server SSL profile re-encrypts the traffic before sending it to the back-end servers.
* Target State (SSL Offloading): The requirement is to "offload SSL" to reduce web server load. This means the BIG-IP will continue to handle the encryption for the users (keeping the Client SSL profile) but will communicate with the back-end servers using unencrypted HTTP.
Why Option A is correct:
* Remove the Server SSL profile: By removing this profile, the BIG-IP stops attempting to initiate an SSL
/TLS handshake with the pool members.
* Configure Pool Members to use HTTP: The service port for the pool members must be changed (typically from port 443 to port 80) so that the BIG-IP sends standard HTTP traffic to the servers.
Why other options are incorrect:
* B & D: These suggest removing the Client SSL profile. If you remove this, the users can no longer connect via HTTPS, which violates the requirement for encrypted communication between the users and the BIG-IP.
* C: Changing the Virtual Server to accept HTTP traffic would mean the user-to-BIG-IP connection is no longer encrypted, which is the opposite of SSL termination/offloading.
NEW QUESTION # 17
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