哪个术语描述了当一根电缆的电脉冲穿过相邻电缆时的干扰?Which term describes the interference when electrical impulses from one cable cross over to an adjacent cable?
A. 交叉干扰crossover
B. 串扰crosstalk
C. 串通collision
D. 射频干扰RFI
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一群新聘用的入门级网络工程师正在谈论他们作为一个团队必须安装的网络布线。以太网直通 UTP 电缆的特征是什么?A group of newly hired entry-level network engineers are talking about the network cabling they are going to have to install as a team. What is a characteristic of Ethernet straight-through UTP cable?
A. 它只能在电缆的两端使用 T568A 标准It can only use the T568A standard at both ends of the cable.
B. 它可用于连接两个网络主机It can be used to connect two network hosts.
C. 它是思科专有的。It is Cisco proprietary.
D. 它容易受到来自 EMI 和 RFI 的干扰。It is susceptible to interferences from EMI and RFI.
已聘请一位网络专家在一家组装飞机发动机的公司安装网络。由于业务的性质,该地区受到电磁干扰的影响很大。应推荐哪种类型的网络媒体,以便数据通信不会受到 EMI 的影响?A network specialist has been hired to install a network in a company that assembles airplane engines. Because of the nature of the business, the area is highly affected by electromagnetic interference. Which type of network media should be recommended so that the data communication will not be affected by EMI?
A. STP
B. 纤维光学fiber optic
C. UTP
D. 同轴电缆coaxial
骨干网络和电话公司常用哪种类型的网络电缆?Which type of network cable is commonly used in backbone networks and telephone companies?
A. 双绞线电缆twisted-pair cable
B. 屏蔽的双绞线电缆shielded twisted-pair cable
C. 光纤电缆fiber-optic cable
D. 同轴电缆coaxial cable
应使用哪种类型的以太网电缆直接连接两个设备,这两个设备都使用相同的引脚来传输和接收数据?Which type of Ethernet cable should be used to directly connect two devices that both use the same pins for transmitting and receiving data?
A. 同轴电缆coaxial cable
B. 光纤电缆fiber-optic cable
C. 交叉双绞线电缆crossover twisted-pair cable
D. 直通双绞线电缆straight-through twisted-pair cable