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Question 1. Which of the following technologies allows for separation of the control plane and data plane in a network? A) MPLS B) SDN C) NFV D) WiFi Answer: B Explanation: SDN (Software-Defined Networking) separates the control plane from the data plane, centralizing network intelligence and programmability. Question 2. What is the primary function of a hypervisor in virtualization? A) Encrypting data B) Managing virtual machines C) Routing packets D) Configuring firewalls Answer: B Explanation: Hypervisors are responsible for creating, running, and managing virtual machines on physical hardware. Question 3. Which plane in SDN architecture is responsible for making forwarding decisions? A) Data plane B) Application plane C) Control plane D) Management plane Answer: C
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Explanation: The control plane makes forwarding decisions, while the data plane forwards packets based on these decisions. Question 4. Which cloud delivery model provides users with the highest level of control over the infrastructure? A) SaaS B) PaaS C) IaaS D) DaaS Answer: C Explanation: IaaS (Infrastructure as a Service) gives users control over operating systems, storage, and deployed applications. Question 5. Open vSwitch is best described as what type of component? A) SDN controller B) Network hypervisor C) Virtual switch D) Physical router Answer: C Explanation: Open vSwitch is an open-source virtual switch designed for network automation in virtualized environments. Question 6. What is the main role of the NFV Orchestrator (NFVO) in ETSI NFV architecture? A) Physical hardware management B) VNF lifecycle management C) Orchestrating network services
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B) Solution Design, Planning, and Operation C) NFV Architecture D) Control Plane Design Answer: B Explanation: This domain covers solution design, planning, and operational best practices for SDN/NFV. Question 10. What is the primary business driver for adopting NFV? A) Increased energy consumption B) Reduced Capex and Opex C) Requirement for physical appliances D) Decreased automation Answer: B Explanation: NFV reduces capital and operational expenditures by replacing physical appliances with virtualized functions. Question 11. Which of the following is NOT a component of the ETSI NFV MANO framework? A) VNF Manager (VNFM) B) Network Hypervisor C) NFV Orchestrator (NFVO) D) Virtualized Infrastructure Manager (VIM) Answer: B Explanation: The MANO framework includes the VNFM, NFVO, and VIM, but not a “network hypervisor.” Question 12. In SDN, which interface is used by applications to communicate with the SDN controller?
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A) Southbound B) Northbound C) Westbound D) Data plane Answer: B Explanation: The northbound interface allows applications to communicate with the SDN controller for network programmability. Question 13. What is the main advantage of centralized monitoring in SDN? A) Increased hardware costs B) Simplified network troubleshooting C) Decreased network visibility D) Slower response times Answer: B Explanation: Centralized monitoring simplifies network management and troubleshooting by consolidating visibility. Question 14. Which of the following is an example of a Virtual Network Function (VNF)? A) Firewall appliance B) OpenFlow switch C) Application server D) Virtual firewall Answer: D Explanation: VNFs are virtualized versions of network appliances like firewalls, load balancers, and routers.
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Explanation: The SDN controller, being centralized, can be a single point of failure and a target for attacks. Question 18. Which of the following best describes Service Function Chaining in NFV? A) Replacing all network hardware B) Connecting multiple VNFs to create a service C) Running VMs on physical servers D) Using only physical appliances Answer: B Explanation: Service Function Chaining connects VNFs in sequence to deliver complex network services. Question 19. What is the primary role of OpenStack in an NFV environment? A) Hypervisor management B) VNF Orchestration C) Virtualized Infrastructure Management D) Application deployment Answer: C Explanation: OpenStack typically acts as the VIM, managing compute, storage, and network resources for NFV. Question 20. Which SDN plane do user applications interact with? A) Infrastructure plane B) Control plane C) Application plane D) Data plane
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Answer: C Explanation: User applications interact with the application plane, which communicates with the controller via northbound APIs. Question 21. What is the main goal of Lifecycle Service Orchestration (LSO) in SDN/NFV? A) Encrypting traffic B) Automating service lifecycle management C) Increasing manual configuration D) Reducing network performance Answer: B Explanation: LSO automates the entire service lifecycle, including creation, fulfillment, control, assurance, and termination. Question 22. Which of the following is a Type 1 hypervisor? A) VirtualBox B) KVM C) VMware ESXi D) QEMU Answer: C Explanation: Type 1 hypervisors run directly on hardware; VMware ESXi is an example. Question 23. Which protocol is commonly used for SDN controller communication with physical switches? A) NetBIOS B) OpenFlow
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B) Provides SLAs and service guarantees C) Lacks scalability D) No support for VLANs Answer: B Explanation: Carrier Ethernet offers service-level agreements and scalability for carrier networks. Question 27. Which of the following is an example of a public cloud provider? A) OpenStack B) Google Cloud Platform C) VMware vSphere D) Mininet Answer: B Explanation: Google Cloud Platform is a public cloud provider; OpenStack and VMware are platform solutions. Question 28. What is the main driver for network functions virtualization in service provider networks? A) Physical cable reduction B) Rapid service innovation and deployment C) Increased hardware costs D) Manual configuration Answer: B Explanation: NFV enables rapid deployment and scaling of network services, accelerating innovation. Question 29. Which SDN component is responsible for programming forwarding tables in network devices?
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A) Application plane B) Control plane C) Data plane D) User plane Answer: B Explanation: The control plane programs the forwarding behavior of the data plane in SDN. Question 30. What is the role of Mininet in SDN research and development? A) Physical switch platform B) Network simulation/emulation C) Cloud orchestrator D) Northbound API Answer: B Explanation: Mininet is used to emulate and test SDN networks for research and development. Question 31. Which technology is primarily used to provide network programmability? A) SDN B) MPLS C) WiFi D) Ethernet Answer: A Explanation: SDN enables network programmability, allowing dynamic, automated network management through software.
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Explanation: Orchestration automates and coordinates the deployment and management of VNFs and network services. Question 35. What is the main purpose of network abstraction in SDN? A) Decreasing network flexibility B) Hiding underlying network complexity C) Increasing manual management D) Disabling virtualization Answer: B Explanation: Network abstraction hides the complexity of underlying hardware, simplifying management and enabling programmability. Question 36. Which virtualization technology is an example of a Type 2 hypervisor? A) VMware ESXi B) Xen C) Oracle VirtualBox D) KVM Answer: C Explanation: Type 2 hypervisors like VirtualBox run on top of a host operating system. Question 37. What is a key advantage of using SDN in data center networks? A) Increased manual configuration B) Centralized, automated control C) Higher physical hardware requirements D) Decreased network agility
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Answer: B Explanation: SDN centralizes network management, enabling automation and agility in data centers. Question 38. What does the acronym VIM stand for in the NFV MANO architecture? A) Virtualized Infrastructure Manager B) Virtual Internal Module C) Virtual Infrastructure Middleware D) Virtualization Integration Manager Answer: A Explanation: VIM stands for Virtualized Infrastructure Manager, managing compute, storage, and network resources in NFV. Question 39. Which of the following is a security best practice for SDN controllers? A) Disabling authentication B) Isolating the control network C) Allowing open API access D) Ignoring logs Answer: B Explanation: Isolating the SDN controller’s network helps protect the control plane from attacks. Question 40. Which service model delivers only software applications over the internet? A) SaaS B) PaaS C) IaaS
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C) SNMP
D) TCP
Answer: B Explanation: RESTful APIs are commonly used for northbound communication between applications and the SDN controller. Question 44. What is the primary purpose of Service Engineered Paths (Service Chaining) in NFV? A) Creating a physical network B) Linking VNFs to provide end-to-end services C) Increasing hardware reliance D) Disabling automation Answer: B Explanation: Service Engineered Paths connect VNFs in sequence to deliver comprehensive network services. Question 45. Which MEF domain covers automated service lifecycle management? A) NFV Concepts B) Lifecycle Service Orchestration (LSO) C) SDN Deep Dive D) SDN Controller Design Answer: B Explanation: The LSO domain covers the automation of service lifecycle management across SDN/NFV domains. Question 46. What is a common use case for SDN in the mobile core network?
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A) Cloud RAN B) Physical routing C) Manual VLAN configuration D) Increased hardware costs Answer: A Explanation: SDN is used in Cloud RAN (Radio Access Network) for centralized and flexible management of radio resources. Question 47. Which of the following is NOT an open-source SDN project? A) OpenDaylight B) Open vSwitch C) Mininet D) VMware NSX Answer: D Explanation: VMware NSX is a proprietary SDN solution; the others are open source. Question 48. Which hypervisor is based on Linux’s KVM module? A) VMware ESXi B) VirtualBox C) KVM D) Xen Answer: C Explanation: KVM (Kernel-based Virtual Machine) is a Linux module enabling hypervisor capabilities.
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Question 52. Which component is responsible for deploying and managing resources in a cloud environment? A) VIM B) VNFM C) SDN Controller D) Physical switch Answer: A Explanation: The VIM (Virtualized Infrastructure Manager) manages compute, storage, and network resources in cloud/NFV environments. Question 53. What is the main benefit of network programmability? A) Manual hardware upgrades B) Automated, dynamic network management C) Static provisioning D) Increased complexity Answer: B Explanation: Network programmability enables automated, dynamic changes to the network, improving agility. Question 54. What is a function of the SDN Application Plane? A) Packet forwarding B) Network policy definition and automation C) Physical link management D) Hardware installation
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Answer: B Explanation: The application plane defines policies and automates network tasks through the controller. Question 55. What is the main purpose of the ETSI NFV reference architecture? A) Standardizing physical hardware B) Defining components and interfaces for NFV deployment C) Creating proprietary solutions D) Limiting virtualization Answer: B Explanation: ETSI NFV reference architecture specifies the main components and interfaces for NFV solutions. Question 56. Which cloud service model provides a platform for building and deploying applications? A) SaaS B) PaaS C) IaaS D) NaaS Answer: B Explanation: PaaS (Platform as a Service) provides a platform for developers to build and deploy applications. Question 57. Which SDN element collects statistics and state information from the infrastructure? A) East-west interface B) Data plane C) Controller
