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NEW QUESTION # 31
A BIG-IP Administrator adds new pool members into a highly utilized pool. Users report application failures.
Which pool-level setting should be checked?
Answer: C
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
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)
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
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?
Answer: D
Explanation:
Connection rate limits restrict how many new connections are accepted per second, protecting application resources.
NEW QUESTION # 34
What would be the best persistence method for F5 to load balance traffic from clients via a single source IP (NAT) to multiple pool members with even distribution for an HTTPS web application?
Answer: A
Explanation:
When clients connect through a single source IP (NAT) - such as a corporate proxy or carrier-grade NAT
- Source Address Affinity persistence becomes entirely ineffective because all clients share an identical source IP address. This would force every client session to the same pool member, completely eliminating even distribution and defeating the purpose of load balancing.
Cookie Persistence is the optimal solution in this scenario because it operates at Layer 7 , inserting a unique cookie into each client ' s HTTP/HTTPS response. Each individual browser session carries its own distinct cookie value, allowing the BIG-IP to identify and persist individual clients to specific pool members - regardless of whether they share a common source IP address. This guarantees both session persistence and even load distribution across pool members.
The remaining options are unsuitable because:
* Destination Address Affinity persists based on destination IP, irrelevant for client-to-server session stickiness.
* SSL Persistence uses the SSL Session ID for persistence, but SSL session IDs are frequently renegotiated and are unreliable for long-term persistence across modern TLS implementations.
* Source Address Affinity fails entirely under NAT conditions as described.
Cookie persistence is the industry-standard method for HTTPS application load balancing requiring per-client session affinity.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Persistence Methods - Cookie, Source Address, and SSL Persistence.
NEW QUESTION # 35
A Standard Virtual Server reports poor network performance for Internet-based clients.
What configuration should be applied?
Answer: B
Explanation:
WAN TCP profiles are optimized for high latency and packet loss typical of Internet clients, while LAN profiles are ideal for backend servers.
NEW QUESTION # 36
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