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| Section | Weight | Objectives |
|---|---|---|
| High Availability Concepts | 15% | - Redundancy and failover basics - HA architecture and principles |
| Networking Components & Relationships | 30% | - Interfaces, trunks, VLANs, self-IPs, routes
|
| Traffic Behavior Analysis | 35% | - Configuration-based traffic behavior
|
| ADC Application Objects & Virtual Servers | 20% | - Virtual server types
|
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質問 # 33
A BIG-IP Administrator has a cluster of devices.
What should the administrator do after creating a new Virtual Server on device 1? (Choose one answer)
正解：C
解説：
In a BIG-IP device service cluster, configuration objects such as virtual servers, pools, profiles, and iRules are maintained through configuration synchronization (config-sync).
Key BIG-IP concepts involved:
Device Service Cluster (DSC)
A cluster is a group of BIG-IP devices that share configuration data. One device is typically used to make changes, which are then synchronized to the rest of the group.
Config-Sync Direction Matters
Changes are made on a local device
Those changes must be pushed to the group
The correct operation is "Sync Device to Group"
Why C is correct:
The virtual server was created only on device 1
Other devices in the cluster do not yet have this object
To propagate the new virtual server to all cluster members, the administrator must synchronize device 1 to the group Why the other options are incorrect:
A . Synchronize the settings of the group to device 1
This would overwrite device 1's configuration with the group's existing configuration and may remove the newly created virtual server.
B . Create a new cluster on device 1
The cluster already exists. Creating a new cluster is unnecessary and disruptive.
D . Create a new virtual server on device 2
This defeats the purpose of centralized configuration management and risks configuration drift.
Conclusion:
After creating a new virtual server on a BIG-IP device that is part of a cluster, the administrator must synchronize the configuration from that device to the group so all devices share the same ADC application objects.
質問 # 34
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
正解：C
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 # 35
What type of virtual server should be used to load balance UDP traffic without considering previous connections?
正解：A
解説：
When handling high-volume UDP traffic where the BIG-IP does not need to maintain any session history or relationship between packets, aStatelessvirtual server is the appropriate choice.
* No Connection Tracking:A stateless virtual server does not create or maintain entries in the BIG-IP connection table. This means the system processes each packet as an individual event, without
"considering previous connections" or packets from the same source.
* High Performance:Because the system bypasses the overhead of state management, stateless virtual servers provide the highest possible throughput for UDP and ICMP traffic.
* Use Cases:This is ideal for services like DNS (stateless queries) or some types of syslog traffic where each packet is independent and doesn't require the persistence or protocol inspection typically provided by a full-proxy.
Why other options are incorrect:
* Forwarding:While a Forwarding (IP) virtual server can handle UDP, it still maintains a state entry in the connection table to ensure return traffic is handled correctly.
* Standard:This is a full-proxy virtual server. It is inherently stateful and requires a connection table entry for every flow it manages.
* Reject:This is a special virtual server type that simply drops incoming traffic and, in the case of TCP, sends a reset (RST) or, for UDP, sends an ICMP unreachable message. It is not a load balancing type.
質問 # 36
Active connections to pool members are unevenly distributed. The load balancing method is Least Connections (member). Priority Group Activation is disabled.
What is a potential cause of the uneven distribution? (Choose one answer)
正解：C
解説：
With Least Connections (member), BIG-IP attempts to send new connections to the pool member with the fewest current connections. In a perfectly "stateless" scenario (no affinity), this often trends toward a fairly even distribution over time.
However, persistence overrides load balancing:
* When a persistence profile is applied, BIG-IP will continue sending a client (or client group) to the same pool member based on the persistence record (cookie / source address / SSL session ID, etc.).
* This means even if another pool member has fewer connections, BIG-IP may still select the persisted member to honor session affinity.
* The result can be uneven active connection counts, even though the configured load balancing method is Least Connections.
Why the other options are not the best cause:
* A. Priority Group Activation is disabledPriority Group Activation only affects selection when priority groups are configured; disabling it does not inherently create uneven distribution under Least Connections.
* B. SSL Profile Server is appliedA server-side SSL profile affects encryption to pool members, but it does not by itself cause skewed selection across pool members. (Skew could happen indirectly if members have different performance/latency, but that's not the primary, expected exam answer.)
* D. Incorrect load balancing methodLeast Connections is a valid method and does not itself explain unevenness unless something is overriding it (like persistence) or pool members are not all eligible.
Conclusion:
A persistence profile is the most common and expected reason that active connections become unevenly distributed, because persistence takes precedence over the Least Connections load-balancing decision.
質問 # 37
To increase available bandwidth of an existing Trunk, the BIG-IP Administrator is adding additional interfaces. Which command should the BIG-IP Administrator run from within bash shell?
正解：C
解説：
Configuring networking objects in BIG-IP requires using the correctTMSH module pathandverb.
* Module Path:Trunks are networking objects, so they reside under the /net module, not /sys.
* Verb:Since the trunk already exists, the modify verb must be used to update its properties rather than create.
* Syntax:The correct syntax to append physical interfaces to an existing trunk is tmsh modify /net trunk
[name] interfaces add { [port list] }.
* Data Plane Impact:Adding interfaces to a trunk (Link Aggregation) increases the total aggregate bandwidth available to the system and provides additional hardware redundancy.
質問 # 38
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