Switch
Created: 2025-11-25 Tags: networking switch layer2 infrastructure
Description
A network switch is a Layer 2 (Data Link) device that forwards frames based on MAC addresses within a local network. Modern switches may also include Layer 3 capabilities.
Key Functions
- MAC address learning
- Frame forwarding
- Collision domain separation
- VLAN support
- Port security
Switch Types
Unmanaged Switch
- Plug-and-play
- No configuration
- Basic functionality
- Consumer/small office
Managed Switch
- Full configuration capability
- VLAN support
- Port security
- SNMP monitoring
- Enterprise use
Layer 3 Switch
- Routing capabilities
- Inter-VLAN routing
- Faster than router for LAN
- Cost-effective for large networks
Security Features
Port Security
- Limit MAC addresses per port
- Prevent MAC flooding
- Sticky MAC learning
VLAN Support
- Network segmentation
- Broadcast domain separation
- Security zones
Other Features
- DHCP snooping
- Dynamic ARP Inspection (DAI)
- IP Source Guard
- 802.1X authentication
- Storm control
Related Topics
Back to: 00-MOC-Cybersecurity-Roadmap