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NEW QUESTION # 80
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 # 81
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: D
Explanation:
Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.
NEW QUESTION # 82
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? (Choose one answer)
Answer: A
Explanation:
From the exhibit, the pool contains different applications on different service ports (for example, HTTP/80, FTP/21, HTTPS/443, SSH/22). To mark pool members correctly, BIG-IP must be able to verify the actual service running on each member's port.
In BIG-IP Administration: Data Plane Configuration, monitor behavior is described as follows:
* When multiple monitors are assigned to a pool, the Availability Requirement controls how monitor results are evaluated:
* At least one = the pool member is marked up if any one of the assigned monitors succeeds.
* All = the pool member is marked up only if every assigned monitor succeeds.
* For pools containing members with different services/ports, using All can incorrectly mark members down because monitors intended for other services will fail on the wrong port.
Why C is correct:
* Assigning HTTPS, HTTP, FTP, and SSH covers the actual services shown in the pool.
* Setting the Availability Requirement to at least one ensures that each pool member is considered available when its appropriate service monitor succeeds, without being forced to pass unrelated service monitors.
Why the other options are incorrect:
* A / D (Availability Requirement = all): would cause members to be marked down when unrelated monitors fail (e.g., SSH monitor against an HTTP member).
* B (includes ICMP): ICMP can indicate the host is reachable even if the application service is down, which does not "accurately" reflect service availability.
Therefore, the best choice is HTTPS, HTTP, FTP, and SSH with Availability Requirement of at least one health monitor.
NEW QUESTION # 83
A Standard Virtual Server reports poor network performance for Internet-based clients.
What configuration should be applied?
Answer: D
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 # 84
A BIG-IP Administrator finds the following log entry after a report of user issues connecting to a virtual server:
01010201: Intercept exhaustion on 10.70.110.112 to 192.28.123.250:80 (proto 6) How should the BIG-IP Administrator modify the SNAT pool that is associated with the virtual server?
(Choose one answer)
Answer: C
Explanation:
The log message "Intercept exhaustion" indicates that the BIG-IP system has exhausted the available source port translations for one or more SNAT addresses. This occurs when too many concurrent client connections are being translated through a limited number of SNAT IP addresses, and all ephemeral source ports (typically ~64,000 per SNAT IP) are in use.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Each SNAT IP address provides a finite number of available source ports.
* When the number of concurrent connections exceeds the available port space, the BIG-IP logs an Intercept exhaustion error and new connections fail.
* The recommended resolution is to increase the available SNAT resources by adding additional IP addresses to the SNAT pool.
Why the other options are incorrect:
* A. Increase the timeout of the SNAT addressesIncreasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.
* B. Remove the SNAT pool and apply SNAT AutomapSNAT Automap uses the Self IP addresses on the egress VLAN, which may not provide additional capacity and can introduce routing or design issues.
This is not a direct or recommended fix for SNAT exhaustion.
* C. Remove an IP address from the SNAT poolThis would reduce the number of available source ports and further exacerbate the intercept exhaustion condition.
Correct Resolution:
By adding an IP address to the SNAT pool, the BIG-IP increases the total number of available source ports, alleviating intercept exhaustion and restoring successful client connections.
NEW QUESTION # 85
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