6V0-21.25問題集を掴み取れ！[最新2026]VMware試験合格させます
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質問 # 45
Which of the following does the Applied To field impact?
- A. NSX Manager rule count
- B. ESX host rule count
- C. Per VM vNIC rule count
- D. System wide rule count
正解：C
解説：
In the VMware vDefend Distributed Firewall (DFW), the "Applied To" field is a critical optimization feature. By default, DFW rules are applied to all workloads (Applied To: DFW). However, when you specify specific groups in the "Applied To" field, the rule is only pushed down to the specific vNICs of the virtual machines residing in those groups. This drastically reduces the size of the rule table maintained in memory on the ESXi host for each specific vNIC (the per VM vNIC rule count), improving hypervisor performance and ensuring that workloads only process rules relevant to their network traffic.
質問 # 46
Which feature allows vDefend to dynamically enforce firewall rules between application tiers?
Response:
- A. Context-aware policies using application metadata
- B. vMotion affinity binding
- C. Role-based access tied to ESXi licensing
- D. Static MAC ACLs
正解：A
質問 # 47
What best describes an incident in vDefend NDR?
- A. It always consists of multiple correlated events
- B. An incident always begins and ends with multiple correlated events
- C. It always consists of a single event
- D. It may consist of a single event or a number of events that have been correlated
正解：D
解説：
To understand Network Detection and Response (NDR), you must understand the hierarchy of security telemetry: Events, Incidents, and Campaigns.
An Event is a single anomaly or triggered detector (e.g., an IDS signature matching, or NTA noticing an unusual DNS query).
An Incident is a formalized alert presented to the security analyst in the NDR dashboard, indicating an actual threat that requires investigation.
While the primary power of vDefend NDR is its Artificial Intelligence engine-which correlates multiple seemingly low-level events (like a port scan followed by a suspicious file download and lateral movement) into a single, high-confidence Incident-an Incident does not strictly require multiple events.
If a single, highly critical event occurs-such as the Malware Prevention engine definitively detonating and confirming a severe piece of zero-day ransomware-the NDR engine will immediately escalate that single event into a full-blown Incident. Therefore, an incident may consist of just one highly critical event, or dozens of lower-level events correlated together over time.
質問 # 48
Which of the following components can enforce Layer 7 Context Firewall Rules? (Select all that apply)
- A. Tier 1 Gateway
- B. VMK Interface
- C. Distributed Firewall
- D. Tier 0 Gateway
正解：A、C、D
解説：
Layer 7 Context-Aware Firewalling goes beyond traditional Layer 3 (IP Address) and Layer 4 (Port/Protocol) filtering. It involves Deep Packet Inspection (DPI) to identify the actual application (App-ID), URL, or Fully Qualified Domain Name (FQDN) being used (e.g., distinguishing between standard web browsing and an unauthorized file transfer over the same HTTPS port 443).
VMware vDefend is highly versatile and can enforce these advanced Layer 7 context rules across multiple enforcement points in the data center:
Distributed Firewall (DFW) (Option A): Enforces L7 rules directly at the vNIC of the virtual machine. This is ideal for East-West micro-segmentation, stopping a compromised VM from communicating with another VM via an unauthorized application protocol.
Tier-1 Gateway (Option B): Enforces L7 rules at the tenant or application boundary. This is ideal for protecting a specific application zone from other zones within the data center.
Tier-0 Gateway (Option C): Enforces L7 rules at the main edge of the data center. This acts as the primary North-South perimeter firewall, inspecting traffic entering or leaving the physical network.
(Note: VMkernel (VMK) interfaces (Option D) are strictly used by the ESXi hypervisor for management, vMotion, and storage traffic, and are not dataplane enforcement points for guest VM firewall rules).
質問 # 49
Which of the following API actions are not valid?
- A. GET
- B. DELETE
- C. POST
- D. UPDATE
正解：D
解説：
The VMware vDefend REST API strictly adheres to standard HTTP protocols and syntax. When interacting with an API endpoint to manipulate a security object, you must use standard HTTP verbs (methods).
Valid HTTP verbs include GET (to retrieve or read data), POST (to create new data), PUT (to replace data), PATCH (to partially modify data), and DELETE (to remove data).
While "Update" is a concept (represented by the letter 'U' in CRUD), UPDATE is NOT a valid HTTP verb or API action. If you attempt to send an HTTP request with the method UPDATE to the vDefend Manager, the API gateway will reject it with an error (typically a 405 Method Not Allowed or 400 Bad Request).
質問 # 50
You are building a VMware vDefend Distributed Firewall policy to protect an application. You want to be sure that the policy cannot be modified by two different users simultaneously. What should you do?
- A. Move the policy so that it is the first policy in the list
- B. Define the policy action as Block
- C. Set the Locked option of the firewall policy to Yes
- D. Use role-based access control to make all other users read-only users
正解：C
解説：
In enterprise environments with multiple security administrators, concurrent modifications to firewall rulesets can cause configuration conflicts or override critical security postures. VMware vDefend provides a native "Lock" feature specifically for this scenario. By clicking the lock icon (setting the Locked option to 'Yes') on a specific firewall policy section, the administrator claims exclusive editing rights to that section. Other administrators can still view the rules, but they cannot add, delete, or modify them until the original owner unlocks the policy. This guarantees administrative safety without having to aggressively demote other users' RBAC permissions (Option D).
質問 # 51
When viewing the details of a Network Traffic Analysis detection event, what makes up the Impact Score? (Select all that apply)
- A. Campaign
- B. Severity
- C. Detector
- D. Confidence
正解：B、D
解説：
Within the vDefend Network Detection and Response (NDR) dashboard, every threat event is assigned an Impact Score (a numerical value typically ranging from 0 to 100) to help security operations teams prioritize their incident response.
This Impact Score is a calculated composite metric derived from two distinct factors:
Severity (Option D): This represents the potential theoretical damage the attack could cause to the environment if successful (e.g., a critical remote code execution vs. a low-level port scan).
Confidence (Option A): This represents how certain the AI/NTA engine is that this event is a true positive attack and not just benign, anomalous background noise.
"Campaign" and "Detector" are metadata tags used to group and identify the alert, but they are not the mathematical values used to calculate the Impact Score.
質問 # 52
Which three capabilities are available through NSX IDPS threat signature configuration?
(Choose three)
Response:
- A. Assign severity levels to IDS alerts
- B. Customize threshold values for alert triggers
- C. Apply threat profiles to specific workloads
- D. Enable or disable specific attack signatures
- E. Define signature-based segmentation policies
正解：A、C、D
質問 # 53
Which three capabilities does vDefend provide to implement Zero Trust security for container environments?
(Choose three)
Response:
- A. Granular policy enforcement per pod or namespace
- B. Contextual segmentation based on Kubernetes attributes
- C. Identity-based access control for API traffic
- D. Persistent storage snapshots for container security
- E. Packet-level analysis at the hardware NIC level
正解：A、B、C
質問 # 54
Which three potential misconfigurations should be checked when troubleshooting Distributed Firewall enforcement failures?
(Choose three)
Response:
- A. Disabled logging on Tier-0 Gateway
- B. Incorrect security group membership
- C. Overlapping NSX VLAN transport zones
- D. Rule precedence and ordering issues
- E. Service insertion or redirection failure
正解：B、D、E
質問 # 55
What is the main benefit of implementing Role-Based Access Control (RBAC) in NSX security operations?
Response:
- A. It enables automatic VM backup scheduling
- B. It ensures users have only the necessary permissions to perform their roles
- C. It disables audit logging for trusted users
- D. It allows direct kernel-level access to NSX components
正解：B
質問 # 56
Which three logging levels are available for vDefend firewall rules?
(Choose three)
Response:
- A. Warning
- B. Informational
- C. Error
- D. Off
- E. Alert
正解：A、B、D
質問 # 57
Which of the following is true regarding the VMware vDefend Distributed Firewall?
- A. VMware vDefend Distributed Firewall runs in the ESXi vSwitch
- B. VMware vDefend Distributed Firewall is a hypervisor-based software defined firewall solution
- C. VMware vDefend Distributed Firewall runs as an agent in a physical switch with open software development capabilities
- D. VMware vDefend Distributed Firewall can be deployed as a virtual machine or on bare metal hardware
正解：B
解説：
The core architectural differentiator of VMware vDefend is that its Distributed Firewall (DFW) is deeply embedded directly into the ESXi hypervisor kernel as a software-defined construct.
It does not run inside the standard vSwitch (Option B is false; it runs via the NSX vSphere Installation Bundle (VIB) modules attached to the vNIC datapath). It is not a centralized virtual machine or physical appliance (Option C describes legacy centralized firewalls or Edge Gateway Firewalls). It enforces stateful Layer 2-Layer 7 security rules directly at the virtual network interface card (vNIC) of every single workload, providing true, scalable East-West micro-segmentation independent of the underlying physical network topology.
質問 # 58
Which of the following are maintained by the vDefend Distributed Firewall on a per vnic basis? (Select all that apply)
- A. Flow Table
- B. Rule Table
- C. IDPS Table
- D. Firewall Table
正解：A、B
解説：
The VMware vDefend Distributed Firewall (DFW) achieves its massive scalability by enforcing security directly in the ESXi hypervisor kernel at the specific virtual network interface card (vNIC) of every workload. To optimize memory and CPU performance, the hypervisor does not force every vNIC to evaluate every single rule in the entire data center.
Instead, it pushes down and maintains two specific tables locally in memory on a strict per-vNIC basis:
Rule Table (Option A): This contains only the specific firewall rules relevant to that exact vNIC (determined by the "Applied To" field in the firewall policy).
Flow Table (Option B): This tracks the active, stateful connections specifically originating from or destined to that exact vNIC, allowing the firewall to automatically permit return traffic without having to re-evaluate the Rule Table.
質問 # 59
Which scripting or automation platform is commonly used alongside NSX-T for automating vDefend firewall rule deployment?
Response:
- A. Ansible Playbooks for storage arrays
- B. Chef
- C. Hadoop
- D. Python with REST API
正解：D
質問 # 60
What is the primary objective of implementing lateral protection using the vDefend Distributed Firewall?
Response:
- A. To prevent data loss during VM snapshot operations
- B. To control and restrict east-west traffic between workloads
- C. To enforce bandwidth throttling policies
- D. To restrict access to NSX-T Manager via VPN
正解：B
質問 # 61
In a vDefend NDR campaign, "hosts" refers to which of the following?
- A. vSphere hosts
- B. Workloads
- C. VCF nodes
- D. NSX-prepared cluster hosts
正解：B
解説：
Within the VMware vDefend Network Detection and Response (NDR) UI and alerting systems, the term "hosts" is used from a cybersecurity perspective, not an infrastructure perspective. It refers directly to the network endpoints or virtual machines-specifically, your Workloads-that are participating in the analyzed traffic. It does not refer to the underlying physical hypervisors (like vSphere ESXi hosts or VCF nodes) that run the compute layer. NDR monitors these workload "hosts" to correlate suspicious activities into broader threat campaigns.
質問 # 62
In a large-scale deployment, how can administrators reduce firewall rule sprawl and improve manageability?
Response:
- A. Leverage security groups and tagging for policy abstraction
- B. Use physical IP addresses in every rule
- C. Disable rule logging for all policies
- D. Create a rule for every individual VM
正解：A
質問 # 63
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