A.9 B.3 C.12 D.6
A. using DHCP snooping B. snooping the incoming 802.1Q VLAN tag C. using CDP D. snooping the CoS marking on the incoming frames
A. Route reflectors are not passing updates properly. B. BGP synchronization has been enabled. C. The next-hop address is unreachable. D. No loopback interface has been configured on a router.