The diagram below shows the TCP connection setup for an application. Which of the following virtual server types applies? (Choose one answer)
Correct Answer: B
The diagram illustrates a specific TCP handshake sequence where the BIG-IP system acts as a transparent forwarder rather than a full proxy. The key indicators that identify this as aForwarding (IP) virtual server are as follows: * Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet lookingonly at the destination IP address. This is the fundamental characteristic of a Forwarding IP virtual server, which uses the system's routing table to make forwarding decisions instead of load balancing to a pool of members. * Handshake Sequence: Unlike aStandardvirtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK)beforeinitiating a separate connection to the server, the Forwarding IP virtual server passes the client's originalSYNpacket directly to the destination node. * Response Timing: The BIG-IP system waits for theSYN-ACKfrom the destination node before it sends a SYN-ACK back to the client. It essentially "passes through" the handshake signals while still maintaining a state entry in the connection table to track the flow. * Packet-by-Packet Logic: While it tracks the state, it does not perform address translation (unless SNAT is specifically configured) or deep packet inspection like a full proxy would. Why other options are incorrect: * Standard virtual server: A Standard virtual server is a "full proxy." It would finish the handshake with the client first and only then open a second, independent TCP connection to the backend server. * Stateless virtual server: A stateless virtual server does not track connections in the connection table. The diagram shows the system meticulously passing sequence numbers ($seq\_num$) and acknowledgment numbers ($ack\_num$) between the two sides, which requires stateful tracking of the TCP flow.
Question 22
Which two statements describe differences between the active and standby systems? (Choose two.)
Correct Answer: A,C
Question 23
The owner of a web application asks the BIG-IP Administrator to change the port that the BIG-IP device sends traffic to. This change must be made for each member in the server pool named app_pool for the Virtual Server named app_vs. In which area of the BIG-IP Configuration Utility should the BIG-IP Administrator make this change?
Correct Answer: B
In the BIG-IP object hierarchy, the destination port for backend traffic is defined at thePool Memberlevel. While a Virtual Server listens on a specific port, the Pool determines where that traffic is directed after the load balancing decision is made. * Pools and Pool Members: A pool is a collection of devices, often called pool members, to which the BIG-IP system passes traffic. Each pool member is defined by an IP address and a service port. * Port Translation: When an administrator needs to change the port the BIG-IP uses to communicate with backend servers, they must navigate to the specific Pool and modify the service port for each member within that pool. * Logical Separation: * Virtual Serversdefine the "front-end" port where clients connect. * Poolsdefine the "back-end" port where the application resides. * Nodesrepresent the physical server's IP address and do not contain port-specific configuration.
Question 24
A BIG-IP Administrator needs to connect a BIG-IP system to two upstream switches to provide external network resilience. The network engineer instructs the administrator to configure interface binding with LACP. Which configuration should the administrator use? (Choose one answer)
Correct Answer: D
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents: In BIG-IP architecture, link aggregation and redundancy at Layer 2 are implemented using Trunks, not virtual servers or pools. According to BIG-IP Administration Data Plane Concepts: Interfaces are the physical network ports on the BIG-IP device A Trunk is a logical grouping of multiple interfaces Trunks can be configured to use LACP (Link Aggregation Control Protocol) to: Provide link redundancy Increase aggregate bandwidth Allow automatic detection of link failures VLANs are then assigned to the trunk, not directly to individual interfaces, once aggregation is in place Correct Design for the Scenario: To connect BIG-IP to two upstream switches with LACP: One physical interface from BIG-IP connects to Switch A Another physical interface from BIG-IP connects to Switch B Both interfaces are placed into the same trunk LACP is enabled on the trunk and on the switches This configuration allows: Traffic to continue flowing if one interface or switch fails Proper LACP negotiation between BIG-IP and the upstream switches Clean separation of responsibilities (Layer 2 handled by trunking, Layer 4-7 by virtual servers) Why Option D Is Correct: A Trunk containing an interface connected to each switch is exactly how BIG-IP implements LACP-based interface binding The trunk handles link state, load distribution, and failover at the data plane Why the Other Options Are Incorrect: A & B - Virtual servers operate at Layers 4-7 and have nothing to do with physical link aggregation or LACP C - VLAN IDs and MAC addresses are not configured inside a trunk definition; trunks aggregate interfaces, and VLANs are applied to trunks Key Data Plane Concept Reinforced: On BIG-IP systems, LACP is always configured on a Trunk, which aggregates physical interfaces to provide Layer 2 resiliency and bandwidth aggregation. Virtual servers and pools are not involved in physical interface binding.
Question 25
The BIG-IP appliance fails to boot. The BIG-IP Administrator needs to run the End User Diagnostics (EUD) utility to collect data to send to F5 Support. Where can the BIG-IP Administrator access this utility?
