2-tier and 3-tier LAN architectures

[dhikra-marghli8]

Hello

i want to know  what's the difference between 2-tier and 3-tier LAN architectures  ??   and

i want to know we have in the network part 2 tier and 3 tier WAN architectures ?? 

i wait a reply from architect  network 

Thanks

[M02@rt37 · Accepted solution]

Hello @dhikra-marghli8 

In a 2-tier LAN architecture, there are two main layers: the access layer and the core layer.
Access Layer: This layer connects end-user devices such as computers, printers, and other peripherals to the network.
Core Layer: Responsible for high-speed, efficient packet switching to connect different parts of the access layer.

A 3-tier LAN architecture includes three layers: the access layer, distribution layer, and core layer.
Access Layer: Connects end devices to the network.
Distribution Layer: Acts as an intermediary between the access and core layers, providing services like VLAN configuration and routing.
Core Layer: Manages high-speed, efficient data transport between different distribution layer devices.

Differences ?
3-tier architectures generally offer better scalability due to the distribution layer, allowing for more flexibility in managing and expanding the network. They provide better control and segmentation of the network through the distribution layer.

2-tier architectures might be simpler but may face performance challenges as the network grows.

Today, modern architecture on DC use spine and leaf architecture instead of traditional 3-Tier.

[M02@rt37 · Accepted solution]

@dhikra-marghli8 

Good article here for spine Leaf vs tradi. Architectures 

https://www.versitron.com/pages/spine-leaf-architecture-vs-three-tier-architecture-analyzed-and-compared

[M02@rt37 · Accepted solution]

@dhikra-marghli8 

In the context of WAN architectures, the terms 2-tier and 3-tier are less commonly used. Instead, WAN architectures often involve concepts like edge, distribution, and core.

- Edge: This is where the local network connects to the wider network, often involving devices like routers and firewalls.

- Distribution : Similar to LAN architectures, the distribution layer in a WAN context may involve functions like routing, ensuring efficient traffic flow between different edges.

- Core/Backbone : This layer handles the high-speed, long-distance transport of data between different distribution points.

In WANs, the design often revolves around ensuring efficient connectivity between geographically dispersed locations. This might involve redundant connections, load balancing, and optimization for various types of traffic.

[dhikra-marghli8]

In the context of WAN architectures, 

Edge mean ==>  CPE  or  A-PE ?

distribution ==>  A-PE  and AGG-PE ?

core ==> mean : route-reflector  with Busniess -PE ?

i wait a reply

Thnaks

[dhikra-marghli8]

also i have other question

LAN architecture ==> it is a architecture before backbone  ( befor MPLS ) ?? 

WAN architedture : it is a architecture  in the backbone ( in the network backbone MPLS ) ?, 

i wait a answer 

Thanks

[M02@rt37 · Accepted solution]

Hello @dhikra-marghli8 

To go further...

LAN architecture focuses on the design and implementation of networks within a confined physical location.

It includes considerations for connecting computers, devices, and resources within the local area.

A WAN, on the other hand, covers a larger geographical area and often spans across cities, countries, or even continents. WAN architecture is concerned with designing and managing networks that connect multiple LANs across larger distances. It involves technologies and protocols that enable communication over longer distances, such as MPLS/SR-MPLS in the backbone.

[balaji.bandi]

There is good cisco CVD can help you  :

https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-campus-lan-wlan-design-guide.html

other L2 and SD-Access design can be find here :

https://www.cisco.com/c/en/us/solutions/design-zone/networking-design-guides/campus-wired-wireless.html#~stickynav=1