英译汉：relay

A . A.PTN B . B.PON C . C.无线回传 D . D.微波

A . 正确 B . 错误

A . When you want to drop excess traffic above the CIR B . When there is a speed mismatch between the central site and the remote site C . When using Frame Relay SVCs D . When over-subscribing the central site link E . When LLQ is implemented on the Frame Relay PVC F . When Multilink PPP LFI is implemented on the Frame Relay PVC

A . 默认情况下配置DHCP服务器和DHCP delay都必须开启DHCP服务 B . VLANIF100接口对接收到的DHCP报文通过中继发送到外部DHCP Server C . 为VLANIF100接口指定DHCP服务器组为dhcpgroup1 D . 需要首先创建DHCP服务器组并为服务器组添加DHCP服务器 E . 默认dhcpgroup1会自动添加网络中的DHCP服务器

A . 常开型 B . 常闭型 C . 通用型

A . 正确 B . 错误

A . a coast station/a ship station B . an EPIRB/a SART C . ARQ/FEC D . a back-up satellite/a land SAR unit

A . The number of FECN packets that are received by the router B . The number of BECN packets that are received by the router C . The ip address of the local router D . The value of the local DLCI E . The status of the PVC that is configured on the router

A . The number of FECN packets that are received by the router B . The number of BECN packets that are received by the router. C . The ip address of the local router D . The value of the local DLCI E . The status of the PVC that is configured on the router

A . 正确 B . 错误

A . 配置DHCP服务器组的组名 B . 配置DHCP服务器组中的DHCP服务器IP地址 C . 配置启动DHCPRelay功能的接口编号及接口的IP地址 D . 配置option82插入功能

A . Relay接入天线与回传天线间无隔离度要求，而直放站有 B . Relay接入天线与回传天线间有隔离度要求，而直放站无 C . Relay空口同步较直放站容易 D . 直放站容易抬升低噪

A . EIA/TIA B . Q.932 C . Q.933A D . IEEE E . Cisco F . Annex D

A . Tunnel label B . VC-label C . 5-byte ATM header D . Payload E . 4 byte ATM header F . Support for 30 packed cell

A . 正确 B . 错误

A . DHCP协议多采用广播报文，如果出现多个子网则无法穿越。所以需要DHCP relay设备 B . DHCP relay一定是一台交换机或者路由器 C . DHCP relay设备可以是一台主机 D . DHCP relay不改变报文内容，报文原样转发

A . A.1A B . B.2A C . C.3A D . D.4A

A．SPE B．NPE C．CPE D．UPE

A.DHCP request报文转发至远端PE后，远端PE再该报文单播发送至 DHCP server B.L2VPN若是VFI模式，DHCP reply报文直接根据DMAC进行查表广播至L2VPN区域 C.L2L3桥接点将DHCP request广播报文获取后，进行relay转变为组播报文至L3VPN中转发 D.L2VPN若是VFI模式，DHCP reply报文广播至该三层子接口对应的所有VLL链路

A．AC110V B．AC380V C．AC220V D．DC24V

是 否