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NEW QUESTION # 18
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers. Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?
Answer: C
Explanation:
This question addresses the critical architectural distinction between "member-based" and "node-based" load balancing in environments where servers are multi-homed or host multiple virtualized services. On a BIG-IP, a node represents the underlying IP address of a physical or virtual server, while a pool member represents a specific combination of that IP and a service port (e.g., 10.1.1.10:80).
When multiple pools reference the same IP address across different ports or Virtual Servers, using Least Connections (member) (Option D) only balances connections relative to that specific pool. For example, if Pool_A and Pool_B both use Server_X, and Pool_A has 100 connections while Pool_B has only 5, a member- based algorithm for Pool_B only sees the 5 connections and may continue to send traffic there even if Server_X is CPU-saturated by Pool_A.
The Least Connections (node) algorithm (Option B) solves this by tracking the aggregate total of all active connections directed to that specific node (IP address) across every pool on the system. By selecting the node with the absolute lowest total connection count, the BIG-IP ensures a more equitable distribution of work at the hardware resource level. Predictive methods (Options A and C) use a ranking system based on the trend of connection counts over time, but for the specific requirement of maintaining an equal number of current connections on multi-service servers, the direct Least Connections (node) calculation is the standard and most effective procedural choice.
NEW QUESTION # 19
An LTM device has a virtual server mapped to www.f5.com with a pool assigned. The objects are defined as follows: Virtual server: Destination 192.168.245.100:443 netmask 255.255.255.0. Persistence: Source address persistence netmask 255.0.0.0. SNAT: Automap. Profiles: HTTP/TCP. How should the BIG-IP Administrator modify the persistence profile so that each unique IP address creates a persistence record?
Answer: C
Explanation:
Source Address Affinity (Persistence) works by tracking the source IP address of incoming packets to ensure a client stays connected to the same backend server. The "netmask" setting within the persistence profile determines the "granularity" of this tracking. A netmask tells the BIG-IP how many bits of the source IP address to ignore when creating the persistence record. For example, the current setting of 255.0.0.0 (a /8 mask) means the BIG-IP only looks at the first octet of the IP; this results in all users from the same large Class A network (e.g., everyone from 10.0.0.0 to 10.255.255.255) being persisted to the exact same server, which can lead to severe load imbalance.
To ensure that each unique IP address creates its own individual persistence record, the administrator must set the netmask to 255.255.255.255 (for IPv4). This is a "host mask" or /32, which instructs the BIG-IP to evaluate all 32 bits of the client's source IP address. With this setting, 10.1.1.1 and 10.1.1.2 will be treated as distinct entities and can be load balanced to different servers, each maintaining their own "stickiness". While Option A (255.255.255.0) would group users by their local subnet, only the full 255.255.255.255 mask satisfies the requirement for true unique-IP persistence. This configuration is standard for internet-facing applications where users arrive from diverse locations and the administrator wants to maintain the most granular and balanced distribution of traffic possible.
NEW QUESTION # 20
A configuration change is made on the standby member of a device group. What is displayed as
"Recommended Action" on the Device Management Overview screen?
Answer: C
Explanation:
The BIG-IP system uses a centralized management framework to ensure that all devices within a Sync- Failover group share a consistent configuration. When an administrator makes a change on any member of the group-whether it is the active or the standby device-the system detects a "ConfigSync" mismatch. The
"Device Management >> Overview" screen tracks these changes by comparing the commit ID and timestamps of the configurations across all peers.
If a change is made on the standby member, that device now possesses a more recent configuration than the other members of the group. Consequently, the BIG-IP GUI will display a status of "Changes Pending" and suggest a Recommended Action to resolve the discrepancy. In this scenario, the correct action is to Synchronize the standby member configuration to the group. This push operation will copy the updated configuration from the standby device to the active device (and any other peers), bringing the entire cluster back into a "In Sync" status. It is important to note that BIG-IP allows bi-directional synchronization; you do not have to be on the active device to push a configuration. However, administrators must be cautious:
choosing Option C (Synchronizing the active member to the group) would overwrite the changes just made on the standby device with the older configuration from the active device, effectively reverting the changes. The Recommended Action always points toward the direction that propagates the most recent change to the rest of the group.
NEW QUESTION # 21
What is the status of a pool member when manual resume is enabled and a health check first fails and then passes?
Answer: C
Explanation:
With manual resume enabled, BIG-IP does not automatically return a pool member to service after recovery. The member remains offline until manually re-enabled.
NEW QUESTION # 22
During high-demand traffic events, the BIG-IP Administrator needs to limit new connections per second.
What should be applied?
Answer: C
Explanation:
Connection rate limiting controls how many new connections per second are accepted, protecting backend resources.
NEW QUESTION # 23
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