When a switch port is used as a VLAN trunk, which of the following trunk modes are valid？

A.Blocking

B. Auto

C. Desirable

D. On

E. Transparent

F. Learning

A. show port network

B. show running-config

C. show controllers Ethernet-controller

D. show interfaces

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

ly converged？

A．when all switches have the same BID as the root switch

B．when all switches have received the MAC address of each neighboring switch

C．when every enabled switch port has been assigned a unique identifier

D．when every operating switch port is in either the blocking or forwarding state

E．when all switches are in either client, server, or transparent mode

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

A. is olated mode

B. switchport mode

C. modular mode

D. community mode

E. promiscuous mode

F. global mode

A.isolated mode

B. switchport mode

C. modular mode

D. community mode

E. promiscuous mode

F. global mode

A. The denied MAC addresses have already been learned or confgured on another secure interface in the same VLAN.

B. The denied MAC address are statically configured on the port.

C. The minimum MAC threshold has been reached.

D. The absolute aging times for the denied MAC addresses have expired.

A. Port Mirroring

B. PVLAN tagging

C. Storage I/O Control

D. Ingress Traffic Shaping

ghts on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

A.the session layer

B.the protocol layer

C.the data link layer

D.the access layer

E.the network layer

F.the application layer