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質問 # 50
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
正解:A
解説:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
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 a Forwarding (IP) virtual server are as follows:
Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet looking only 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 a Standard virtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK) before initiating a separate connection to the server, the Forwarding IP virtual server passes the client's original SYN packet directly to the destination node.
Response Timing: The BIG-IP system waits for the SYN-ACK from 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.
質問 # 51
When using the setup utility to configure a redundant pair, you are asked to provide a "Failover Peer IP".
Which address is this?
正解:A
解説:
When establishing a redundant pair, each device must know where to send its health heartbeats and sync data.
* The Peer IP: The Failover Peer IP is the IP address belonging to the other BIG-IP device in the HA pair. This is typically a34 Self-IP on a dedicated "HA" or "Internal" VLAN, or the Management IP.
* Purpose: It identifies the destination for the "Heartbeat" (the "Are you alive?" check).
* Setup Context: During the initial setup, you tell Device A to look for Device B at its "Failover Peer IP," and you tell Device B to look for Device A at its respective "Failover Peer IP."
質問 # 52
Which virtual server type is being configured in the screenshot? (Choose one answer.)
正解:C
解説:
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
The configuration shown matches a Performance Layer 4 virtual server because it is explicitly using a FastL4 profile:
The screenshot shows Protocol: TCP and Protocol Profile (Client): fastL4.
In BIG-IP data plane terms, FastL4 is the hallmark of a Performance (Layer 4) virtual server, designed to process connections at Layer 4 with minimal overhead (high throughput/low latency) compared to full proxy L7 processing.
The screenshot also shows HTTP Profile (Client): None (and HTTP server profile effectively not in use).
A Standard virtual server commonly uses full-proxy features and frequently includes L7 profiles (like HTTP) when doing HTTP-aware load balancing, header manipulation, cookie persistence, etc. In contrast, a Performance L4 virtual server typically does not use an HTTP profile because it is not doing HTTP-aware (Layer 7) processing.
It is not a Forwarding IP virtual server:
A Forwarding (IP) virtual server is used to route/forward packets (often without load balancing to pool members in the same way as Standard/Performance VS) and is selected by choosing a forwarding type. The presence of a TCP protocol with a FastL4 client profile aligns with a Layer 4 load-balancing style virtual server, not a packet-forwarding virtual server type.
Conclusion: Because the configuration is TCP-based and explicitly uses fastL4 with no HTTP profile, the expected BIG-IP virtual server type is Performance Layer 4 (Option C).
質問 # 53
A standard virtual server has been associated with a pool with multiple members. Assuming all other settings are left at their defaults, which statement is always true concerning traffic processed by the virtual server?
正解:A
質問 # 54
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
正解:A
解説:
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.
質問 # 55
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