CCSK Module 2 Unit 3 Answers – Software Defined Network Knowledge Check Quiz Full 100% 2023 2024
This is CCSK Module 2 Unit 3 Answers – Software Defined Network Recovery Knowledge Check Quiz. Our expert team has verified questions and answers with clear explanations to get a full score of 100%. You can review all these questions before taking the exam.
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Which of the following physical networks is used for Internet to instance traffic?
- Storage
- Virtual
- Service
- Management
Answers Explanation & Hint:
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Why should cloud providers use multiple underlying physical networks? (select all that apply)
- Cost management
- Better performance
- Better isolations
- Resiliency
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Answers Explanation & Hint:
The reasons why cloud providers should use multiple underlying physical networks are:
- Better Performance: Multiple physical networks allow cloud providers to distribute network traffic across different paths, reducing congestion and improving overall network performance. This helps in providing low-latency and high-bandwidth connections to cloud consumers, resulting in a better user experience.
- Better Isolation: Using multiple physical networks helps in isolating different types of traffic or different customer data, enhancing security and privacy. By segregating network traffic, cloud providers can minimize the risk of data breaches or unauthorized access between different users and services.
Both better isolation and better performance are important factors that drive cloud providers to implement multiple physical networks to offer more secure and efficient cloud services.
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Which virtual network technology is best suited for cloud?
- VLAN
- V-flow
- SDN
- Token Ring
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Answers Explanation & Hint:
The virtual network technology that is best suited for the cloud is SDN (Software-Defined Networking).
SDN is a network architecture that separates the control plane from the data plane, allowing for centralized network management and control through software. In a cloud environment, SDN provides several benefits that make it highly suitable:
- Flexibility and Agility: SDN enables cloud providers to dynamically configure and reconfigure network resources to adapt to changing demands. This flexibility is essential in cloud environments where resources need to be provisioned and scaled rapidly based on workload requirements.
- Centralized Management: SDN allows for centralized network management, making it easier to monitor, configure, and optimize the network across the entire cloud infrastructure. This centralized control enhances network visibility and simplifies network administration.
- Automated Provisioning: With SDN, network provisioning and management tasks can be automated through software, reducing the need for manual intervention. Automated provisioning speeds up the deployment of new services and ensures consistency across the network.
- Network Virtualization: SDN facilitates network virtualization, enabling the creation of multiple virtual networks on top of the physical infrastructure. This network virtualization allows cloud providers to isolate different customer environments securely.
- Scalability: SDN can scale to accommodate the dynamic nature of cloud environments. It can handle large-scale networks and effectively manage traffic even as the cloud infrastructure expands.
On the other hand, the other options mentioned:
- VLAN (Virtual Local Area Network): While VLANs are a form of network virtualization, they have limitations in terms of scalability and flexibility compared to SDN. VLANs are often used within a single data center but may not be as suitable for the highly dynamic and distributed nature of cloud environments.
- V-flow: V-flow is not a standard virtual network technology in cloud computing. It is possible that this term refers to specific vendor-specific solutions, but without further context, it’s challenging to provide a specific assessment.
- Token Ring: Token Ring is an outdated networking technology that is not well-suited for modern cloud environments. It has been largely replaced by Ethernet-based technologies and is not relevant to current cloud infrastructure requirements.
Overall, SDN stands out as the most suitable virtual network technology for cloud environments due to its agility, centralization, automation, network virtualization capabilities, and scalability.
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Virtual networks:
- May include inherent security capabilities
- Take fewer resources
- Substitute for physical networks
- Are more flexible, but more difficult to secure
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Answers Explanation & Hint:
Virtual networks offer several advantages and considerations in the context of cloud computing. Let’s review each statement:
- May include inherent security capabilities: Virtual networks can indeed include inherent security capabilities. Cloud service providers often implement security features like isolation, access controls, encryption, and virtual firewalls in their virtual networking infrastructure. These features contribute to enhancing the security of the cloud environment.
- Take fewer resources: Virtual networks are more resource-efficient than traditional physical networks. They do not require dedicated physical hardware for each network segment, reducing the hardware costs and infrastructure complexity. Virtual networks enable the sharing of physical network resources, leading to optimized resource utilization.
- Substitute for physical networks: Virtual networks can substitute for physical networks to a certain extent. They provide the necessary network connectivity for cloud-based resources, including virtual machines, containers, and other services. However, virtual networks still rely on the underlying physical network infrastructure to handle actual data transmission.
- Are more flexible, but more difficult to secure: Virtual networks do offer greater flexibility and agility, as they allow for easy reconfiguration and scaling of network resources. However, the increased flexibility can also make securing virtual networks more complex. Virtual networks require robust security measures to protect against various threats, as misconfigurations or vulnerabilities could potentially impact multiple virtual machines or services.
In summary, virtual networks are an integral part of cloud computing and bring various advantages, such as improved resource efficiency, flexibility, and inherent security capabilities. However, their dynamic and virtual nature also demands careful attention to security measures to ensure the protection of cloud resources and data. Cloud providers and consumers must implement robust security practices to mitigate potential risks associated with virtual network environments.
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Which is a defining characteristic of Software Defined Netoworks
- Uses OpenFlow
- Decouples the control plane from the underlying physical network
- Leverages packet tagging
- Autoscaling for resiliency
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Answers Explanation & Hint:
The defining characteristic of Software-Defined Networks (SDN) is:
Decouples the control plane from the underlying physical network.
SDN is a network architecture that separates the control plane (which determines how data packets are forwarded) from the data plane (which actually forwards the data packets). By decoupling these two planes, SDN centralizes network management and control, allowing administrators to configure and manage the network dynamically through software.
The other options are not defining characteristics of SDN:
- Uses OpenFlow: OpenFlow is a communication protocol that allows the SDN controller to communicate with the forwarding devices (switches and routers). While OpenFlow is commonly associated with SDN, it is not a defining characteristic but rather a specific protocol used in some SDN implementations.
- Leverages packet tagging: Packet tagging is a technique used to identify and prioritize specific packets in a network. While it can be used in SDN environments for traffic management, it is not unique to SDN and can also be employed in traditional networking.
- Autoscaling for resiliency: Autoscaling is a concept used in cloud computing to automatically adjust the number of resources (e.g., virtual machines) based on demand. While it can complement SDN by dynamically adjusting the network capacity to support autoscaled cloud resources, it is not a defining characteristic of SDN itself. SDN primarily focuses on the separation of the control plane and data plane for network management and flexibility.
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Which SND security capability often replaces the need for a physical or virtual appliance?
- Security groups
- Integrated isolation
- Lack of support for packet sniffing
- Default deny
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Answers Explanation & Hint:
The SDN security capability that often replaces the need for a physical or virtual appliance is Security groups.
Security groups are a fundamental feature in many SDN implementations, especially in cloud environments like Amazon Web Services (AWS). They act as virtual firewalls that control inbound and outbound traffic to and from virtual machines or instances. Security groups allow administrators to define inbound and outbound traffic rules based on specific criteria, such as source IP addresses, destination IP addresses, ports, and protocols.
By leveraging security groups within the SDN infrastructure, cloud providers and administrators can enforce network security policies directly at the virtual machine or instance level, eliminating the need for traditional physical or virtual firewall appliances. This centralized approach provides more flexibility and agility in managing security rules, as security groups can be easily updated or modified through the SDN controller or cloud management interface.
The other options mentioned are not directly related to replacing physical or virtual appliances:
- Integrated isolation: While SDN provides better network isolation capabilities, it does not directly replace physical or virtual appliances for security purposes. Integrated isolation in SDN helps prevent cross-tenant or unauthorized access between different virtual networks or segments within the SDN infrastructure.
- Lack of support for packet sniffing: SDN, in general, can support packet sniffing if needed, but it does not directly replace the need for physical or virtual appliances that specialize in packet sniffing for security or monitoring purposes.
- Default deny: Default deny is a security principle where all traffic is denied by default, and specific rules are then applied to allow specific traffic types. While it is a useful security concept, it is not a capability unique to SDN or a direct replacement for physical or virtual appliances. Default deny can be applied within SDN-based security groups or other security solutions to enhance security.
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The most effective way for an attacker to compromise a security group is to compromise the host/virtual machine and then modify the rules.
- True
- False
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Answers Explanation & Hint:
The statement is indeed False. I appreciate your patience.
In a well-designed and secure cloud environment, security groups are typically managed separately from the individual virtual machines or instances they are associated with. Security groups are usually managed through a centralized control plane or management interface provided by the cloud service provider.
Even if an attacker gains unauthorized access to a virtual machine or host, they do not have direct administrative access to the security group settings. Security group configurations are controlled and managed separately by the cloud service provider’s infrastructure, and modifying these rules requires proper authentication and authorization.
This separation of concerns helps to prevent attackers from compromising a security group by gaining access to a single virtual machine or host. Cloud providers implement strong security measures to ensure that the management of security groups and other network-related configurations is secure and protected from unauthorized access.