Net+ Three-Tiered, Collapsed Core, and SDN Systems

What is the first tier in a three-tier architecture?

Core layer

What is the Core layer?

The center of the network

What items are contained in the Core layer?

Web servers, databases, and applications

How accessible does the Core layer need to be?

Many people need access to it

What is the second tier in a three-tier architecture?

Distribution layer

What is the Distribution layer?

It is the midpoint between the Core layer and the users

What items are in the Distribution layer?

Usually a group of switches that provide redundancy and connectivity for users to access the Core layer critical resources

What is the third tier of the three-tiered architecture?

Access layer

What is the Access layer?

It’s where the users connect

What items are in the Access layer?

Usually switches that are located nearby the user, end stations, printers

What does the Access layer allow?

Users to connect to the Distribution layer, which then connects to the Core layer

Who uses Collapsed Core architectures?

Smaller organizations

In a Collapsed Core system, what is combined?

Core and Distribution

What are the two layers in a Collapsed Core system?

Collapsed Core, Access

What are the three layers in a Three-Tiered System?

Core, Distribution, Access

What are advantages of the Collapsed Core model over the Three-Tiered system?

Simpler to design and support, less expensive to implement

What is a disadvantage of the Collapsed Core compared to the Three-Tiered system?

Not as resilient

Which of the following layers within software-defined networking focuses on resource requests or information about the network?

Application layer

What does the distribution/aggregation layer provide in a three-tiered data center network architecture?

Boundary definition

How does the distribution/aggregation layer provide boundary definition?

By implementing access lists and filters to define the policies for the network at large

Which of the following layers is NOT used in a three-tiered data center network architecture?

Control layer

What is the management plane used for?

To monitor traffic conditions, the status of the network, and allows network admins to oversee the network and gain insight into its operations

Which of the following planes within software-defined networking focuses on providing network administrators the ability to oversee network operations, monitor traffic conditions, and display the status of the network?

Management plane

What does the infrastructure layer in a software-defined network do?

Contains the physical networking devices that receive information from the control layer about where to move the data and then perform those movements

What layers are in an SDN?

Infrastructure, Control, Application

What is the Infrastructure layer also known as?

Data plane

What is the Control layer also known as?

Control plane

What is the Application layer also known as?

Management plane

What happens at the Infrastructure layer / Data plane?

Processing of the network frames and packets

What layer handles forwarding, trunking, encrypting, NAT?

Infrastructure layer / Data plane

What does the Control layer / Control plane do?

Manages the actions of the data plane

What layer handles routing tables, session tables, and NAT tables?

Control layer / Control plane

What layer handles dynamic routing protocol updates?

Control layer / Control plane

What do you do at the Application layer / Management plane?

Configure and manage devices

What layer handles SSH, browser, and API?

Application layer / Management plane