📖 What is Virtual Routing and Forwarding (VRF)?
A technology that allows multiple instances of a routing table to co-exist within the same router at the same time.
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Sensei Says:
"VRFs are like VLANs for routers. They provide Layer 3 isolation, which is heavily used in enterprise networks and SD-Access architectures."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Virtual Routing and Forwarding (VRF)?
- ▸ Layer 3 virtualization and isolation.
- ▸ Allows overlapping IP address spaces.
- ▸ Requires a Route Distinguisher (RD) in BGP/MPLS environments.
🎯 How does Virtual Routing and Forwarding (VRF) appear on the 200-301 Exam?
Explain how a router can have two identical IP addresses configured on different interfaces.
Identify VRF as the technology used to segment Layer 3 traffic in an enterprise.
❓ Frequently Asked Questions
Is VRF the same as a VLAN?
No, VLANs segment at Layer 2 (switching), while VRFs segment at Layer 3 (routing).
Can devices in different VRFs communicate?
Not directly. You must explicitly configure route leaking or route through an external firewall.
Related Terms from Certified Network Associate
Single-Mode Fiber (SMF)
VLAN (Virtual Local Area Network)
Designated Port
OSPF Router ID (RID)
Social Engineering
Domain Name System (DNS)