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| Section | Objectives |
|---|---|
| Topic 1: Advanced Traffic Control | - Monitoring and Health Checks
|
| Topic 2: High Availability and Troubleshooting | - Diagnostics and Troubleshooting Tools
|
| Topic 3: F5 BIG-IP System Fundamentals | - Architecture Overview of BIG-IP Platform
|
| Topic 4: Traffic Management and Load Balancing | - Virtual Servers and Pools
|
| Topic 5: Traffic Processing and Policies | - Profiles and Protocol Handling
|
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85. Frage
A Standard Virtual Server is configured with SNAT Automap. Backend servers must see the original client IP.
What should be configured?
Antwort: A
Begründung:
X-Forwarded-For inserts the original client IP into HTTP headers, preserving client identity while SNAT is enabled.
86. Frage
During high-demand traffic events, the BIG-IP Administrator needs to limit new connections per second.
What should be applied?
Antwort: B
Begründung:
Connection rate limiting controls how many new connections per second are accepted, protecting backend resources.
87. Frage
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?
Antwort: D
Begründung:
Application-level monitors ensure that only the affected service is marked down, not the entire node.
88. Frage
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?
Antwort: B
Begründung:
When dealing with heterogeneous server hardware where some servers are more powerful than others, a dynamic load balancing method that accounts for both current load and server capacity is required. The Weighted Least Connections (member) method is the most appropriate choice. This method works by tracking the number of active connections to each pool member and then "weighting" that number based on a user-defined Ratio value assigned to the member. For example, the administrator can assign a higher Ratio to the three newer, more powerful servers and a lower Ratio to the two older servers. The BIG-IP then uses a formula to calculate which server should receive the next connection, ensuring that the newer servers handle a proportionately larger share of the total concurrent connections.
Standard Round Robin (Option C) would be ineffective because it distributes connections strictly sequentially (1, 2, 3, 4, 5) without regard for the servers' capacity or current load, which would eventually overwhelm the older servers. Least Connections (member) (Option D) is better than Round Robin because it picks the server with the fewest active connections, but it still assumes all servers are equal; it would try to keep the connection counts identical across all 5 servers, which would still stress the older hardware more than the new. Global Availability (Option B) is a GSLB (DNS-based) method used for multi-site redundancy, not for local pool member load balancing. By using Weighted Least Connections, the administrator achieves a balance where the more capable servers take the brunt of the work while the older servers are utilized only to their specific safe capacity.
89. Frage
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)
Antwort: D
Begründung:
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 UDPSSH uses TCP, not UDP. Changing the protocol would break SSH entirely.
* B. Set Source Address to 10.1.1.2The source address setting controls client access restrictions and is unrelated to protocol parsing issues.
* C. Set Destination Address/Mask to 0.0.0.0/0The 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.
90. Frage
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