Which routing protocol has the smallest default administrative distance?

Which routing protocol has the smallest default administrative distance?

A. IBGP 
B. OSPF 
C. IS-IS 
D. EIGRP 
E. RIP 

Correct Answer: D 
Explanation 
Explanation/Reference: 
The Administrative Distance (AD) of popular routing protocols is shown below. You should learn them by heart: 

 
Note: The AD of iBGP is 200 
The smaller the AD is, the better it is. The router will choose the routing protocol with smallest AD. 
In this case EIGRP with AD of 90 is the smallest one.

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