题目内容
（请给出正确答案）
[单选题]
There are 4 I/O ports in 8051 MCU. In these ports, P can be used as data bus.
A.0
B.1
C.2
D.3
提问人：网友boyliupan
发布时间：2022-01-07
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A、3
B、4
C、5
题目内容
（请给出正确答案）
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更多“There are 4 I/O ports in 8051 …”相关的问题
第3题
What does the number “4/2”on a directional control valve mean？
A．4 positions and 2 ways
B．4 positions and 2 ports
C．4 ways and 2 positions
D．none of the above
第4题
If you need information regarding ordering pilot and/or entering ports you may see Admiralty List of Radio Signal volume___________.
A.2
B.4
C.5
D.6
第5题
There are 2 switches in the Ezonexam LAN, with no routers. Ports 1, 2 & 3 are assigned
to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are assigned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation？ (Select all valid answers)
点击查看答案
A．Host 1 on VLAN 1 can ping Host 2 on VLAN 1
B．Host 1 on VLAN 1 can ping Host 4 on VLAN 2
C．Host 1 on VLAN 1 can not ping Host 2 on VLAN 1
D．Host 4 on VLAN 2 can not ping Host 1 on VLAN 1
E．Host 4 on VLAN 2 can ping Host 2 on VLAN 2
第6题
在交换机SWA上执行 display vlan 2 命令后，交换机输出如下：display vlan 2VLAN ID: 2VLAN Ty
在交换机SWA上执行 display vlan 2 命令后，交换机输出如下：
display vlan 2
VLAN ID: 2
VLAN Type: static
Route interface: not configured
Description: VLAN 0002
Tagged Ports: none
Untagged Ports:
Ethernet1/0/1 Ethernet1/0/3 Ethernet1/0/4
从以上输出可以判断______。
A. 端口 Ethernet1/0/1是一个Trunk 端口
B. VLAN2 中包含了端口Ethernet1/0/1、Ethernet1/0/3 和 Ethernet1/0/4
C. 带有 VLAN2 标签的数据帧离开端口Ethernet1/0/3 时需要剥离标签
D. 当前交换机存在的 VLAN 只有VLAN2
