ITN 101 Module 07 Network Architecture

T/F : The architecture of a network depends on several factors, such as business requirements, the criticality of the functions running in the network, or even the cost factor.

True

What are the tiers in a three-tiered network?

Core, Distribution/Aggregation layer, and Access/Edge tiers

Reduced latency, ease of management, scalability, performance, and ease of troubleshooting. These are benefits of what?

Three-tiered Networks

This tier is responsible for routing traffic in and out of a network.

Core Tier

This is the second tier. It is responsible for implementing filtering using access control lists. The network policies are defined at this layer.

Distribution/Aggregation Layer

At this tier, you implement Layer 3 switches to route packets within a network that consists of different subnets and virtual LANs (VLANs)

Distribution/Aggregation Layer

In this tier, you will find the access switches that connect to the end clients, such as servers and systems.

Access/Edge Tier

Enables you to program complex networks for ease of management by implementing abstraction through different layers in a network

SDN (Software-defined Networking)

This architecture contains four layers: Application layer, Control layer, Infrastructure layer, and Management plane.

SDN Architecture

At this layer, you will find business applications that require the network and its services to work in a certain way. You’ll find applications and network devices such as load balancers and firewalls at this layer.

Application Layer of SDN architecture

This layer is considered to be the brain of the entire SDN. The controller in this layer is responsible for managing the network policies and traffic flow through the SDN.

Control layer

This layer, known as the data plane, consists of switches that handle the traffic. It works with instructions provided by the control layer to handle the traffic.

Infrastructure layer

This layer is responsible for network configuration, monitoring, and management. It works across all layers to ensure the smooth functioning of SDN.

Management plane

A two-tier network architecture. it offers an extremely high throughput and low latency.

Spine and Leaf

The backbone, which contains the switches responsible for routing. These switches can provide high-speed connections that can range from 40 to 3000Gbps

Spine

T/F : Each leaf contains the switches that collect the traffic from connected servers and route it to the switches in the spine layer.

True

Used to connect end devices like servers, firewalls, and edge router

Leaf switches

Used to connect leaf switches

Spine switches

Within a network or data center, the traffic flows from one device to another device.

East-West

Traffic moves vertically in a network, which means it flows in and out of the network or the data center

North-South

An organization maintains and keeps all servers in a centralized data center

On-premise

An organization may use a third-party location to host its servers and networking infrastructure.

Colocation

A collection of storage devices that form a network.

Storage Area Networks (SAN)

How many tiers are there in the spine and leaf network?

2

The traffic that enters into a network is known as the _____ traffic.

Southbound

Which storage area network (SAN) connection type uses an Ethernet switch to send commands to the SAN devices?

Internet Small Computer Systems Interface (iSCS)

At which layer in the software defines network (SDN) will you find a firewall?

Application Layer

Which tier in the three-tiered network is responsible for routing traffic in and out of a network?

Core