📖 What is Administrative Distance (AD)?
A value used by Cisco routers to select the best path when there are two or more different routes to the same destination from different routing protocols.
"A standard static route has a default AD of 1. A directly connected interface has an AD of 0. Remember this for floating static route questions!"
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Administrative Distance (AD)?
- ▸ Route believability
- ▸ Tie-breaker for different routing protocols
- ▸ Cisco proprietary metric (mostly)
🎯 How does Administrative Distance (AD) appear on the 200-301 Exam?
Determining which route will be placed in the routing table when OSPF, EIGRP, and static routes all exist for the same destination.
Manipulating AD to prefer a specific routing path.
❓ Frequently Asked Questions
What is the AD of a static route?
The default AD of a static route is 1, making it highly preferred over dynamic routing protocols.
Can you change the AD of a dynamically learned route?
Yes, administrators can change the AD of routes learned via protocols like OSPF or EIGRP, though it's typically used for advanced traffic engineering.