The question is from ENCOR learning. Why we need separate vlan (vlan0) for 802.1P traffic (CoS, QoS) if we already have 3-bit field reserved in any 802.1Q packet for QoS? What is actually flowing through vlan0? 

I am practicing OSPF and EIGRP on real cisco gear for CCNA and here is my question. Is that any way to change administrative distance of all OSPF routes at one time on one router? The purpose of that is: I want to already configured OSPF routes keep ...