Tier 2 Network Architecture
A two-tier network topology refers to a network architecture that has two layers, or tiers, of network devices.
Access: The first tier is the access layer, which is the point of entry for end-users into the network. It comprises of network devices such as switches, routers, and wireless access points. This layer is responsible for connecting end-users to the network and providing basic security features such as VLANs and access control lists.
Core and Distribution: The second tier is the core layer, which is the backbone of the network. It comprises of high-speed switches and routers that provide high-speed connectivity between the access layer and other devices or networks. This layer is responsible for providing fast and reliable data transfer, and it’s optimized for low latency and high throughput.
In a two-tier network topology, the access layer is responsible for connecting end-users to the network and providing basic security features, while the core layer provides fast and reliable data transfer.
This architecture is often used in smaller networks, where a more complex three-tier topology is not needed. However, it may not be as scalable as a three-tier topology, and it may not provide as much isolation between different parts of the network, making it harder to manage and troubleshoot in case of failure.
Tier 3 Network Architecture
The three-tier network topology refers to the physical layout of a network that follows the three-tier architecture model.
Access: The first tier is the access layer which is the point of entry for end-users into the network. It comprises of network devices such as switches, routers, and wireless access points. This layer is responsible for connecting end-users to the network and providing basic security features such as VLANs and access control lists.
Distribution: The second tier is the distribution layer which acts as a bridge between the access and core layers. It comprises of network devices such as routers and switches that perform tasks such as routing, filtering, and traffic management. This layer also provides advanced security features such as firewalls and intrusion detection systems.
Core: The third tier is the core layer which is the backbone of the network. It comprises of high-speed switches and routers that provide high-speed connectivity between the distribution and access layers. This layer is responsible for providing fast and reliable data transfer, and it’s optimized for low latency and high throughput.
In a three-tier network topology, each layer is designed to perform specific functions and is optimized for different types of traffic.
This architecture allows for a scalable and fault-tolerant network, and it makes it easier to add new devices and services
What is next?
Exploring the multiple Network Topologies and Architectures
About the Author:
Andres Sarmiento, CCIE # 53520
With over 18 years of professional experience, Andres is a specialist in Unified Communications and Collaboration technologies, Enterprise Networks, and Network Security. He has consulted for numerous companies in South Florida, including Financial Institutions, on behalf of Cisco Systems. Andres has played a key role in several high-profile implementations, utilizing Cisco technologies such as Data Center, UC & Collaboration, Contact Center Express, Routing & Switching, Security, and Hosted IPT Service Provider infrastructures.