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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?
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
Refer to the exhibit.
A BIG-IP Administrator configures a new VLAN on an HA pair of devices that does NOT yet have any traffic. This action causes the assigned traffic group to fail over to the standby device. Which VLAN setting should be changed to prevent this issue?
Answer: D
Explanation:
The exhibit shows the advanced configuration of a VLAN where the Fail-safe option is checked. VLAN Fail- safe is a high-availability feature used to monitor network connectivity on a specific VLAN. When enabled, the BIG-IP system monitors the VLAN for network traffic. If the system does not detect any " useful " traffic on the VLAN within the specified Fail-safe Timeout (which is 90 seconds in the exhibit), it attempts to generate traffic by pinging the default gateway or other devices. If it still detects no traffic, the BIG-IP concludes that the VLAN is unreachable or the network interface has failed, and it triggers a " Fail-safe Action " -in this case, " Reboot " or a failover to the peer device in the HA group.
Because the administrator has just created a new VLAN that " does NOT yet have any traffic, " the Fail-safe mechanism triggers immediately after the 90-second timeout period. Since no devices are yet communicating on this VLAN, the BIG-IP incorrectly assumes there is a hardware or cabling failure and forces a failover to ensure the standby device (which might have better connectivity) takes over. To prevent this unwanted failover, the administrator should uncheck the Fail-safe box for that specific VLAN until the VLAN is fully populated with active nodes and regular traffic. Once the application is live and traffic is flowing, Fail-safe can be re-enabled to provide an additional layer of redundancy. Auto Last Hop (Option A) and Source Check (Option B) are routing and security features that do not trigger HA failover events.
NEW QUESTION # 55
A Standard Virtual Server is configured with SNAT Automap. Backend servers must see the original client IP.
What should be configured?
Answer: B
Explanation:
X-Forwarded-For inserts the original client IP into HTTP headers, preserving client identity while SNAT is enabled.
NEW QUESTION # 56
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?
Answer: D
Explanation:
The configuration error is the HTTP Profile = http setting. The virtual server is intended to load balance SSH
, which operates over TCP port 22 and is not an HTTP application protocol. The configured TCP protocol and TCP profile are therefore appropriate, but an HTTP profile should not be attached to this SSH virtual server.
F5 documentation states that an HTTP profile defines how BIG-IP manages HTTP traffic . The standard http profile operates in Reverse proxy mode by default and invokes BIG-IP ' s HTTP protocol processing. F5 separately documents Transparent HTTP proxy mode as the mode that can forward invalid HTTP traffic instead of dropping it. This distinction is important because an SSH protocol exchange is not syntactically valid HTTP traffic.
Setting HTTP Profile to None removes unnecessary Layer 7 HTTP parsing and leaves the virtual server handling the SSH connection through its TCP profile. The other changes are inappropriate: SSH requires TCP rather than UDP; the source address does not need to equal the virtual server ' s destination IP; and changing the destination to 0.0.0.0/0 is unrelated to the application-protocol mismatch.
Reference Topics: Local Traffic Profiles # HTTP Profiles , Proxy Mode , TCP profiles , Virtual Server profile assignment .
NEW QUESTION # 57
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: A
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 # 58
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