Three-Tier Network Architecture

Questions and Answers

What is the primary purpose of the access layer in a three-tier architecture?

To make forwarding decisions based on layer 3 header information

To connect devices to the internet (correct)

To connect to the core layer

To provide redundancy in the network

What type of switches are typically used in the access layer?

Layer 2 switches (correct)

Firewalls

Layer 3 routers

Wireless access points

What is the advantage of using a network emulation tool like EVE-NG?

It allows for the configuration of layer 3 routers

It allows for the design of a three-tier architecture

It allows for the simulation of network traffic

It allows for the implementation of a three-tier architecture (correct)

What is the difference between the access layer and the distribution layer?

The access layer connects devices to the internet, while the distribution layer connects to the core layer Signup and view all the answers

What is the purpose of the core layer in a three-tier architecture?

To provide high-speed connectivity between devices Signup and view all the answers

What is the advantage of using a three-tier architecture?

It allows for the separation of devices into different layers Signup and view all the answers

What is the purpose of the distribution layer in a three-tier architecture?

To aggregate traffic from the access layer Signup and view all the answers

What is the benefit of representing the three-tier architecture with the access layer at the bottom?

It makes it easier to represent the network graphically Signup and view all the answers

What is the primary function of a multilayer switch in a network?

Layer 3 forwarding or routing of packets Signup and view all the answers

What type of connection is often used between the access layer switches and the distribution layer devices?

Fiber optic cables Signup and view all the answers

What is the purpose of using multiple connections between devices in a network?

To provide fault tolerance Signup and view all the answers

What is the term used to refer to the physical interface on a router?

Interface Signup and view all the answers

What is the purpose of the access layer in the three-tier architecture?

To provide physical connectivity for infrastructure devices Signup and view all the answers

What is the primary advantage of using link aggregation in a network?

Enhanced fault tolerance Signup and view all the answers

How do you typically connect devices in a network emulator like EVE-NG?

Using the Connector Tool Signup and view all the answers

What type of switches are used at the core of the three-tier architecture?

Multilayer switches Signup and view all the answers

What is the concept of creating logically separate networks on top of the physical infrastructure?

Overlay Signup and view all the answers

What is the purpose of aligning devices vertically and horizontally in a network diagram?

To improve visualization and readability Signup and view all the answers

What is the purpose of Virtualized Local Area Networks (VLANs)?

To logically separate networks and control traffic flow Signup and view all the answers

What is the typical location of the access layer switches in a network?

On the 40th floor Signup and view all the answers

What is the three-tier architecture composed of?

Access, distribution, and core layers Signup and view all the answers

What is the term used to refer to the physical interface on a switch?

Port Signup and view all the answers

What is the term for the physical components and interfaces of a network?

Underlay Signup and view all the answers

What is the purpose of using multiple connections between the distribution layer devices and the core devices?

To provide fault tolerance Signup and view all the answers

What is the purpose of the distribution layer in the three-tier architecture?

To act as default gateways for client PCs and route traffic Signup and view all the answers

What is the term for the process of logically separating networks and controlling traffic flow?

Virtualization Signup and view all the answers

What is the purpose of the core layer in the three-tier architecture?

To connect multiple blocks to their cores for enterprise-wide connectivity Signup and view all the answers

What type of devices are connected to the access layer in the three-tier architecture?

Client PCs Signup and view all the answers

Study Notes

Three-Tier Architecture

The three tiers in a three-tier architecture are: access layer, distribution layer, and core
The access layer is where devices such as PCs plug in and includes layer 2 switches
Layer 2 switches make forwarding decisions based on layer 2 header information
The distribution layer includes multilayer switches, which can do layer 2 switching and layer 3 forwarding or routing of packets
The core layer includes devices that connect to the distribution layer and provide connectivity to the internet or other blocks of addresses
The three tiers work together to provide access to the internet for devices in the access layer

Designing the Three-Tier Architecture

To design the three-tier architecture, switches and multilayer switches are added to the access, distribution, and core layers
Connectivity is established between the layers using RJ45 connectors or fiber for fault tolerance
Link aggregation can be used to provide multiple connections between devices for fault tolerance

Underlay and Overlay

The physical components and physical interfaces of the network are referred to as the underlay
The overlay represents how traffic will flow logically through the network
Virtualized Local Area Networks (VLANs) can be used to carve out logical subnets within the network
The overlay and virtualization control how traffic will flow, including the use of virtualized layer 3 interfaces at the distribution layer as default gateways for clients

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Description

Designing and implementing a three-tier network architecture using a network emulation tool. Planning and setting up a three-tier architecture from scratch.