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NEW QUESTION # 67
The BIG-IP Administrator needs to load balance a pool of web servers. Load balancing should consider the number of connections that are active on that pool member.
Which load balancing method meets this requirement? (Choose one answer)
Answer: C
Explanation:
The requirement states that load balancing decisions must be based on the number of active connections on each pool member. This directly maps to the Least Connections (member) load balancing method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* Least Connections (member) selects the pool member with the fewest active connections at the time of the request.
* This method dynamically adapts to real-time traffic patterns and ensures that more heavily loaded pool members receive fewer new connections.
* It is especially effective for web servers where connection duration may vary and equal distribution of active sessions is desired.
Why the other options are incorrect:
* B. Round RobinDistributes connections sequentially without considering current load or active connections.
* C. Ratio (member)Distributes traffic based on static ratios, not real-time connection counts.
* D. Ratio (node)Uses predefined ratios at the node level and does not account for active connection counts.
Correct Resolution:
Using Least Connections (member) ensures that new connections are directed to the pool member currently handling the fewest active connections, meeting the stated requirement.
NEW QUESTION # 68
Which type of Virtual Server requires the use of a FastL4 profile?
Answer: A
Explanation:
Performance (Layer 4) virtual servers rely on FastL4 profiles for high-speed Layer 4 traffic handling.
NEW QUESTION # 69
A BIG-IP Administrator configures a node with a standard icmp Health Monitor. The Node shows as DOWN although the Backend Server is configured to answer ICMP requests. Which step should the administrator take next to find the root cause of this issue?
Answer: C
Explanation:
In the F5 BIG-IP ecosystem, a standard ICMP health monitor functions by sending an ICMP echo request to a target node and expecting an ICMP echo reply within a specified timeout period. When a node is marked
"DOWN" despite the backend server being configured to respond to ICMP, the issue typically lies in the network path or the specific packet exchange between the BIG-IP's self IP and the node's IP. Running a tcpdump is the most effective next step because it provides a real-time packet capture of the actual monitor traffic leaving the BIG-IP and any return traffic coming back from the server. This allows the administrator to verify if the BIG-IP is actually sending the echo request, if the request is reaching the server, and if the server is indeed replying or if the reply is being dropped by an intermediate firewall or a security policy.
While other tools have their place, they are inappropriate for this specific layer 3/4 connectivity issue. A qkview is a comprehensive diagnostic file used primarily for F5 Support to analyze the entire system's state but is overkill for initial connectivity troubleshooting. An ssldump is used for inspecting SSL/TLS handshakes and encrypted payloads, which is irrelevant for a non-encrypted ICMP monitor. A curl command is a tool for testing HTTP/HTTPS application-level responses; it cannot be used to troubleshoot ICMP (ping) connectivity directly. By using tcpdump -ni <vlan_name> host <node_ip>, the administrator can see the ICMP "type 8" (request) and "type 0" (reply) packets, immediately identifying if the monitor failure is due to a "Destination Unreachable" message or a simple lack of response, thereby pinpointing the root cause in the data plane.
NEW QUESTION # 70
Which type of Virtual Server requires the use of a FastL4 profile?
Answer: A
NEW QUESTION # 71
A BIG-IP Administrator is configuring an SSH Pool with five members. Which Health Monitor should be applied to ensure that available pool members are monitored accordingly?
Answer: D
Explanation:
SSH (Secure Shell) operates over TCP port 22 , making the TCP health monitor the appropriate and correct choice for monitoring pool members in an SSH pool. The TCP monitor establishes a basic Layer 4 connection to each pool member on the designated port, verifying that the server is reachable and actively accepting TCP connections. A successful three-way handshake confirms the pool member is available; a failure marks it down and removes it from load balancing rotation.
The remaining monitor types are inappropriate for this use case:
* UDP monitor operates at Layer 4 but uses the connectionless UDP protocol, which is incompatible with SSH since SSH exclusively uses TCP as its transport.
* HTTP monitor sends a Layer 7 GET request expecting an HTTP response - irrelevant for an SSH service that does not speak the HTTP protocol.
* HTTPS monitor functions identically to HTTP but over TLS - again, completely misaligned with SSH traffic and port behaviour.
For application-specific SSH validation beyond basic TCP connectivity, an external monitor or custom monitor could be used; however, TCP remains the standard and correct built-in monitor for SSH pool verification within the BIG-IP platform.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Health Monitors - Monitor Types and Protocol Alignment.
NEW QUESTION # 72
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