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NEW QUESTION # 11
Which tmsh command shows virtual server status?
Answer: C
NEW QUESTION # 12
Which Virtual Server type prevents the use of a default pool?
Answer: B
Explanation:
In BIG-IP TMOS administration, the "Forwarding (IP)" virtual server type is unique because it is designed to act as a high-performance router rather than a typical load balancer. Unlike a "Standard" virtual server, which terminates a connection and directs it to a specific pool of members, a Forwarding (IP) virtual server is intended to forward packets based on the system's routing table. Consequently, the configuration for this type of virtual server explicitly removes the option to associate a default pool. If an administrator is troubleshooting a scenario where they cannot assign a pool to a virtual server, they must verify if the type was accidentally set to Forwarding (IP). This type is most commonly used for outbound internet traffic (outbound SNAT) or to allow the BIG-IP to serve as a gateway between internal subnets. Identifying this constraint is vital for troubleshooting configuration errors where an administrator expects the system to load balance traffic but finds the pool association settings are grayed out or unavailable in the Configuration Utility.
NEW QUESTION # 13
Clients report that they cannot reach the virtual server vs-production on port 80, but are able to ping the virtual server address. The configuration is shown below:
Plaintext
ltm virtual vs-production {
destination 10.99.20.50:http
ip-protocol tcp
mask 255.255.255.255
profiles {
http {}
tcp {}
}
source 192.168.0.0/16
translate-address enabled
translate-port enabled
vlans {
external
}
vlans-enabled
}
What is the cause?
Answer: D
Explanation:
The issue is caused by the Source Address restriction configured on the virtual server.
Source Filter: The configuration contains the line source 192.168.0.0/16. This acts as an implicit Access Control List (ACL). The virtual server will only accept and process TCP connections if the client's source IP address falls within the 192.168.x.x range.
Why Ping Works: ICMP (Ping) is handled by the Virtual Address object, not the Virtual Server object. Unless ICMP is specifically disabled on the Virtual Address, it will respond to pings from any subnet, even if the Virtual Server itself is restricted by a source filter or is even disabled.
NEW QUESTION # 14
Exhibit:
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, traffic was not evenly distributed and the pool member 172.16.20.3 received more traffic than the other pool members.
Refer to the exhibit and the virtual server configuration provided below:
Plaintext
ltm virtual http.vs {
destination 10.10.1.100:http
ip-protocol tcp
mask 255.255.255.255
persist {
source_addr { default yes }
}
pool http.pool
profiles {
tcp{}
}
serverssl-use-sni disabled
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
}
What is the most likely cause of this behavior?
Answer: C
Explanation:
The primary reason for the uneven traffic distribution is the presence of a Persistence Profile in the virtual server configuration.
* Load Balancing vs. Persistence: While the Round Robin method is designed to distribute new connections sequentially among pool members, Persistence overrides this logic for existing clients.
* Source Address Persistence: The configuration shows source_addr persistence is enabled. This ensures that once a client (identified by their source IP) is mapped to a pool member, all subsequent connections from that same IP will be sent to the same member for the duration of the persistence record.
* Uneven Distribution Logic: If one source IP address generates significantly more connections or longer-lived sessions than others-or if many clients appear behind a single NAT/Proxy IP-that specific pool member (in this case, 172.16.20.3) will receive a disproportionate amount of traffic compared to the others.
* Evaluating Other Options:
* Automap (Option A): SNAT Automap changes the source IP between the BIG-IP and the pool member. It does not impact the BIG-IP's ability to load balance incoming client requests.
* Ratio Settings (Option B): In the provided exhibit, the pool members have a Ratio of 1, 2, and 3 respectively. While a higher ratio does direct more traffic to a member, the question asks for the
"most likely cause" in the context of the provided ltm virtual configuration, which explicitly highlights the persistence override.
* HTTP Profile (Option C): Round Robin is a Layer 4 load balancing algorithm and does not require a Layer 7 HTTP profile to function.
NEW QUESTION # 15
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: C,D
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 that monitors 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 is the 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 a virtual server marked down (Option A) would not pass traffic at all, and all 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 # 16
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