SDN Control Layer
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Questions and Answers

What is a key security requirement for network devices and network control systems connected to the WAN?

  • Encryption
  • Attack defense (correct)
  • Authorization
  • Authentication

    • What is the purpose of centralized management and O&M system in SD-WAN?

  • To display WAN topology
  • To monitor alarms and logs
  • To remotely manage branch devices
  • All of the above (correct)

    • What type of interfaces does the network controller provide for third-party integration?

  • Eastbound SOAP
  • Westbound GraphQL
  • Southbound RESTful
  • Northbound RESTful (correct)

    • What is transmitted over the WAN that requires security assurance?

    <p>Enterprise WAN application data</p> Signup and view all the answers

    What is displayed on the central dashboard of the network control system?

    <p>All of the above</p> Signup and view all the answers

    Why is encryption required for enterprise services on the WAN?

    <p>To prevent data leakage</p> Signup and view all the answers

    What is the purpose of system security in SD-WAN?

    <p>To protect network devices and control systems</p> Signup and view all the answers

    How do third-party BSS/OSS software integrate with the network controller?

    <p>Through northbound APIs</p> Signup and view all the answers

    What is a common trait among some enterprises that have the capability of deploying optical fibers and building their own backbone networks?

    <p>They are from transportation and electric power industries</p> Signup and view all the answers

    What is the primary reason for using VPN technology in enterprise WAN interconnection?

    <p>To provide secure and reliable connections</p> Signup and view all the answers

    What is the purpose of IPsec technology in enterprise WAN interconnection?

    <p>To provide secure connections between branches and headquarters</p> Signup and view all the answers

    What is the primary advantage of using private lines in enterprise WAN interconnection?

    <p>Lower network costs</p> Signup and view all the answers

    What is the primary purpose of DSVPN and A2A VPN technologies?

    <p>To simplify IPsec configuration on large-scale networks</p> Signup and view all the answers

    What is the primary advantage of using MPLS in enterprise WAN interconnection?

    <p>Lower network costs</p> Signup and view all the answers

    What is the primary purpose of VPDN technologies in enterprise WAN interconnection?

    <p>To allow terminal users or branches to dial up to the carrier network or headquarters network</p> Signup and view all the answers

    What is the primary consideration for deploying enterprise WAN interconnection?

    <p>Enterprise requirements</p> Signup and view all the answers

    What is the role of the infrastructure layer in the SDN architecture?

    <p>To forward traffic based on the policies delivered by the control layer</p> Signup and view all the answers

    What is the name of the organization that provides the SDN network architecture?

    <p>Open Network Foundation (ONF)</p> Signup and view all the answers

    What devices make up the infrastructure layer in the SDN architecture?

    <p>Various common network devices</p> Signup and view all the answers

    How do the network devices in the infrastructure layer forward traffic?

    <p>Based on the policies delivered by the control layer</p> Signup and view all the answers

    What is the main function of the infrastructure layer in the SDN architecture?

    <p>To forward traffic based on the policies delivered by the control layer</p> Signup and view all the answers

    What is the relationship between the infrastructure layer and the control layer in the SDN architecture?

    <p>The control layer delivers policies to the infrastructure layer</p> Signup and view all the answers

    What is the core of the SDN architecture?

    <p>The infrastructure layer</p> Signup and view all the answers

    What is the purpose of the infrastructure layer in the SDN architecture?

    <p>To forward traffic based on the policies delivered by the control layer</p> Signup and view all the answers

    Study Notes

    SDN Architecture

    • The SDN architecture consists of three layers: service layer, control layer, and infrastructure layer
    • The control layer is the brain of SDN, providing abstracted network functions and services to the application layer through northbound interfaces
    • The control layer controls the forwarding behavior of underlying network devices through southbound interfaces

    Control Layer

    • The control layer is the brain of SDN, opening abstracted network functions and services to the application layer
    • The control layer controls the forwarding behavior of underlying network devices through southbound interfaces

    Infrastructure Layer

    • The infrastructure layer consists of various common network devices
    • These network devices forward traffic based on the policies delivered by the control layer
    • The SDN network architecture is provided by the Open Network Foundation (ONF)

    MPLS and Optical Fiber

    • Some enterprises have the capability of deploying optical fibers and building their own backbone networks
    • The cost of using MPLS or private lines is very low for these enterprises
    • MPLS can be used for L2VPN/L3VPN, and optical fiber can be used for SDH/MSTP/WDM

    Enterprise WAN Interconnection Technologies

    • The Internet can be used for enterprise services, but VPN technology is used to provide secure and reliable connections
    • Virtual Private Dial-up Network (VPDN) technologies, such as PPTP, L2TP, and PPPoE, allow terminal users or branches to dial up to the carrier network or headquarters network
    • IPsec and GRE technologies are used to build networks between enterprise branches or between enterprise branches and the headquarters

    Common Application Scenarios of Enterprise WAN Interconnection

    • Enterprise WAN interconnection needs to be deployed based on enterprise requirements
    • SD-WAN must have basic security protection capabilities, such as attack defense
    • The transmission of enterprise WAN application data requires security assurance, including system security and service security

    Centralized Management and O&M

    • Enterprises use centralized management and O&M systems to remotely manage branch devices
    • The system displays WAN topology and remotely monitors alarms, logs, and other key event information of each branch device in real-time
    • The central dashboard displays key network performance data, bandwidth proportion of key applications, and application health scores

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    Description

    This quiz covers the control layer in Software Defined Networking (SDN), its role, and how it interacts with other layers. Learn about the brain of SDN and its significance.

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