A.disable spanning-tree

B.spanning-tree off

C.spanning-tree security

D.spanning-tree portfast

Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)

A．Full-duplex Ethernet uses CSMA/CD to prevent collisions.

B．Half-duplex Ethernet uses a loopback circuit to detect collisions.

C．A full-duplex Ethernet card allows 20Mbps for data transmission.

D．Full-duplex Ethernet makes use of two pairs of wires for data.

E．An Ethernet hub can operate both half and full duplex simultaneously.

在启用IGRP协议时，所需要的参数是：()

A.网络掩码

B.子网号

C.自治系统号

D.跳数

You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal.

A. Connect the PC's COM port to the router's console port using a straight-through cable.

B. Connect the PC's COM port to the router's console port using a rollover cable.

C. Connect the PC's COM port to the router's Ethernet port using a straight-through cable.

D. Connect the PC's Ethernet port to the router's Ethernet port using a rollover cable.

E. Connect the PC's Ethernet port to the router's Ethernet port using a straight- through cable.

F. None of the above

IGP是内部网关协议，BGP是外部网关协议。

此题为判断题(对，错)。