H3C园区的一道题

在如图所示的交换网络中，三台交换机都只有缺省VLAN1,三台交换机的互联端口都为Trunk,且允许所有VLAN通过，三台交换机都开启了全局和端口的GVRP功能在交换机SWA上创建了VLAN10,在SWC上创建了 VLAN20,并且在交换机SWA上设置Ethemet1/0/1端口的GVRP注册模式为Fixed,在三台交换机査看各Trunk端口状态信息，下面显示正确的是 （选择一项或多项）

A. [SWA]display interface Ethernet 1/0/1

Ethernet1/0/1 current state: UP ......

PVID: 1

Mdi type: auto

Link delay is 0(sec)

Port link-type: trunk

VLAN passing: 1 (default vlan), 10,20

VLAN permitted: 1 (default vlan), 2-4094

Trunk port encapsulation: IEEE 802.1q

B. [SWB]display interface Ethernet 1/0/1

Ethernet 1/0/1 current state: UP

PVID: 1

Mdi type: auto

Link delay is 0(sec)

Port link-type: trunk

VLAN passing: 1 (default vlan), 10,20

VLAN permitted: 1 (default vlan), 2-4094

Trunk port encapsulation: IEEE 802.1q

C. [SWB]display interface Ethernet 1/0/2

Ethernet 1/0/2 current state: UP PVID: 1

Mdi type: auto

Link delay is 0(sec)

Port link-type: trunk

VLAN passing: 1 (default vlan), 10,20

VLAN permitted: 1 (default vlan), 2-4094

Trunk port encapsulation: IEEE 802.1q

D. [SWC]display interface Ethernet 1/0/1

Ethernet1/0/1 current state: UP

PVID: 1

Mdi type: auto

Link delay is 0(sec)

Port link-type: trunk

VLAN passing: 1 (default vlan), 10,20

VLAN permitted: 1 (default vlan), 2-4094

Trunk port encapsulation: IEEE 802.1q

Answer: D

为啥BC不对呢？A肯定不对的