24 Questions
What is a key security requirement for network devices and network control systems connected to the WAN?
Attack defense
What is the purpose of centralized management and O&M system in SD-WAN?
All of the above
What type of interfaces does the network controller provide for third-party integration?
Northbound RESTful
What is transmitted over the WAN that requires security assurance?
Enterprise WAN application data
What is displayed on the central dashboard of the network control system?
All of the above
Why is encryption required for enterprise services on the WAN?
To prevent data leakage
What is the purpose of system security in SD-WAN?
To protect network devices and control systems
How do third-party BSS/OSS software integrate with the network controller?
Through northbound APIs
What is a common trait among some enterprises that have the capability of deploying optical fibers and building their own backbone networks?
They are from transportation and electric power industries
What is the primary reason for using VPN technology in enterprise WAN interconnection?
To provide secure and reliable connections
What is the purpose of IPsec technology in enterprise WAN interconnection?
To provide secure connections between branches and headquarters
What is the primary advantage of using private lines in enterprise WAN interconnection?
Lower network costs
What is the primary purpose of DSVPN and A2A VPN technologies?
To simplify IPsec configuration on large-scale networks
What is the primary advantage of using MPLS in enterprise WAN interconnection?
Lower network costs
What is the primary purpose of VPDN technologies in enterprise WAN interconnection?
To allow terminal users or branches to dial up to the carrier network or headquarters network
What is the primary consideration for deploying enterprise WAN interconnection?
Enterprise requirements
What is the role of the infrastructure layer in the SDN architecture?
To forward traffic based on the policies delivered by the control layer
What is the name of the organization that provides the SDN network architecture?
Open Network Foundation (ONF)
What devices make up the infrastructure layer in the SDN architecture?
Various common network devices
How do the network devices in the infrastructure layer forward traffic?
Based on the policies delivered by the control layer
What is the main function of the infrastructure layer in the SDN architecture?
To forward traffic based on the policies delivered by the control layer
What is the relationship between the infrastructure layer and the control layer in the SDN architecture?
The control layer delivers policies to the infrastructure layer
What is the core of the SDN architecture?
The infrastructure layer
What is the purpose of the infrastructure layer in the SDN architecture?
To forward traffic based on the policies delivered by the control layer
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
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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