Article Overview
Transmission (core/distribution) switches handle high-speed data routing across the network backbone, while access switches connect end-user devices to the network at the edge.
Access Switches
Access switches operate at the network edge, connecting end-user devices such as PCs, IP phones, Wi-Fi access points, and cameras to the network . They are typically Layer 2 switches with high port density and cost-effective designs, optimized for:
- High port diversity: Supporting 10/100/1000 Mbps Ethernet ports to accommodate various devices .
- Ease of management: Configurable via web UI or CLI for VLANs, security, and QoS .
- Power over Ethernet (PoE): Supplying power to devices like IP phones and cameras.
- Scalability: Stacking or expansion options allow growth without replacing hardware . Access switches are deployed in offices, small equipment rooms, or departmental networks, providing the first point of network entry for users and devices.
Transmission Switches
Transmission switches, often referred to as core or distribution switches, operate in the middle and backbone layers of hierarchical networks :
- Distribution switches aggregate traffic from multiple access switches, enforce policies (QoS, ACLs), and perform inter-VLAN routing at Layer 3. They prevent congestion by managing traffic before it reaches the core .
- Core switches form the high-speed backbone, handling massive data volumes with ultra-low latency. They connect distribution switches and ensure reliable, high-capacity data transmission across the network . Transmission switches are designed for high throughput, low latency, and fault tolerance, supporting large-scale enterprise or campus networks.
Key Differences
| Feature | Access Switch | Transmission Switch (Core/Distribution) |
|---|---|---|
| Network Layer | Edge (Layer 2) | Distribution: Layer 3, Core: Layer 3/Layer 2 |
| Primary Function | Connect end devices | Aggregate and route traffic between switches |
| Port Density | High | Moderate to low, optimized for speed |
| Cost | Low per port | High, due to performance and reliability |
| Use Case | Offices, small networks, end-user access | Backbone networks, inter-VLAN routing, policy enforcement |
| Power | Often PoE | Rarely PoE; focus on throughput |
Summary
Access switches provide connectivity for end devices and are optimized for port density, cost, and ease of management, while transmission switches (distribution and core) handle high-speed data aggregation, routing, and backbone transmission. Together, they form a hierarchical network that balances performance, scalability, and manageability .
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