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NEW QUESTION # 69
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system.
Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
Answer: A
Explanation:
When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is
"busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a
"Connection Limit" focuses on the total volume. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
NEW QUESTION # 70
A BIG-IP Administrator needs to determine why only one pool member is showing connections from the virtual server, resulting in uneven load balancing.
What two reasons would cause uneven load balancing? (Choose two answers)
Answer: A,C
Explanation:
Uneven load balancing on a BIG-IP system typically occurs when traffic is not distributed evenly across all available pool members. One common reason is thatmonitors have marked down multiple pool members (Option B). When health monitors fail for specific pool members, BIG-IP automatically removes those members from load-balancing decisions. As a result, traffic is sent only to the remaining healthy member, creating the appearance that load balancing is not functioning correctly. This behavior is expected and aligns with BIG-IP's design to ensure traffic is sent only to healthy resources.
Another frequent cause isthe presence of a persistence profile on the pool or virtual server (Option C).
Persistence (such as source address or cookie persistence) forces subsequent client connections to be sent to the same pool member for session continuity. While persistence is critical for certain applications, it can override the load-balancing algorithm and cause most or all traffic to be directed to a single pool member, especially during low traffic volumes or testing scenarios.
The other options are incorrect because avirtual server marked down (Option A)would not pass traffic at all, andall pool members marked down (Option D)would result in no connections rather than uneven distribution.
This analysis follows standard BIG-IP troubleshooting methodology using pool status, monitor results, and persistence configuration review.
NEW QUESTION # 71
A traffic group includes four devices. The failover method is HA order. The failover order is:
- BIGIP-D
- BIGIP-B
- BIGIP-C
- BIGIP-A
Auto fallback is enabled. BIGIP-D has been forced to standby. BIGIP-B was active before being rebooted. Which device is active when BIGIP-B is up after the reboot?
Answer: C
Explanation:
To understand which device becomes active, we must look at how the BIG-IP system handles HA Order and Auto Fallback within a traffic group.
HA Order Mechanism: When a traffic group is configured with an "HA Order" list, the system prefers to host the traffic group on the highest-ranking available device in that list (1 being the highest).
The Impact of "Forced to Standby": BIGIP-D is the first choice in the order, but it has been
"Forced to Standby." This state is persistent and manual; until an administrator releases the
"Force to Standby" state, the device is ineligible to host the traffic group, effectively removing it from the top of the preference list.
Auto Fallback: When "Auto Fallback" is enabled, the traffic group will automatically migrate back to a higher-priority device in the HA order as soon as that device becomes available and is in a healthy "Standby" state.
The Scenario Logic:
1. BIGIP-D is ineligible (Forced Offline/Standby).
2. BIGIP-B is the next highest device in the HA Order (Rank 2).
3. While BIGIP-B was rebooting, the traffic group would have failed over to BIGIP-C (Rank 3).
4. Once BIGIP-B finishes booting and joins the cluster in a "Standby" state, the Auto Fallback setting triggers.
5. Because BIGIP-B is higher in the HA Order than the current active device (BIGIP-C) and the only device above it (BIGIP-D) is ineligible, the traffic group fails back to BIGIP-B.
NEW QUESTION # 72
A BIG-IP Administrator configured a virtual server with a pool of 3 members and selected the Round Robin load balancing method to evenly distribute traffic across the pool members. During initial testing, the virtual server failed to respond to http requests.
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address enabled
translate-port enabled
}
ltm pool http_pool {
members {
10.10.1.101:http {
address 10.10.1.101
session monitor-enabled
state checking
}
10.10.1.102:http {
address 10.10.1.102
session monitor-enabled
state checking
}
}
monitor tcp
}
What configuration change on the BIG-IP will resolve this issue?
Answer: B
Explanation:
The issue described is a classic case of asymmetric routing in a "one-arm" or same-subnet topology.
Symptom Analysis: The Virtual Server (10.10.1.100) and the pool members (10.10.1.101 and 10.10.1.102) are on the same subnet.
The Problem: When a client sends a request to the VIP, the BIG-IP translates the destination IP but keeps the client's original source IP. The server receives the packet and sees a source IP from a different subnet. Instead of sending the response back to the BIG-IP, the server sends it directly to its default gateway. The client receives a response from the server's IP, which it doesn't recognize, causing the connection to fail.
The Solution: Enabling SNAT Auto Map ensures the BIG-IP changes the source IP of the packet to its own self-IP. This forces the pool member to send the response back to the BIG-IP, which then translates it correctly and sends it to the client.
Incorrect Options: Adding an HTTP profile (Option B) or an HTTP monitor (Option C) would enhance the configuration but would not fix the underlying Layer 3 routing issue causing the traffic drop.
NEW QUESTION # 73
Which two methods should the BIG-IP Administrator use to troubleshoot a pool member that has been marked DOWN by its health monitor? (Choose two answers)
Answer: B,C
Explanation:
When a pool member is marked DOWN, it indicates that the configured health monitor is failing. The most effective troubleshooting approach is to focus on the monitor behavior and the actual traffic between BIG-IP and the pool member.
Enabling monitor logging (Option B) is a recommended first step. Monitor logging provides detailed information about why the health check is failing, such as timeouts, connection refusals, incorrect responses, or unexpected status codes. This directly correlates with BIG-IP troubleshooting best practices and allows administrators to confirm whether the failure is due to application behavior, incorrect monitor configuration, or network reachability.
Collecting a TCPdump packet capture (Option D) is also a highly effective method. A packet capture allows the administrator to verify whether the monitor probes are being sent, whether responses are received, and whether packets are being dropped, reset, or malformed. This is especially valuable when diagnosing firewall issues, SSL problems, or application-level failures.
Reviewing pool statistics (Option C) is useful for general monitoring but does not explain why a health monitor is failing. Reviewing the routing table (Option A) is typically unnecessary unless there is evidence of a broader routing issue affecting multiple destinations.
NEW QUESTION # 74
......
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