Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)
A . 802.1Q native VLAN frames are untagged by default.
B . 802.1Q trunking ports can also be secure ports.
C . 802.1Q trunks can use 10 Mb/s Ethernet interfaces.
D . 802.1Q trunks require full-duplex, point-to-point connectivity.
E . 802.1Q trunks should have native VLANs that are the same at both ends.
Answer: A,C,E
Explanation:CCNA Self-Study (ICND Exam): Extending Switched Networks with Virtual LANs http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=2