A technician is using a packet sniffer to identify a server. The technician observes the following network traffic: Which of the following is MOST likely to be the server?（）

A、 HOST-A

B、 HOST-B

C、 HOST-C

D、 HOST-D

一张A2幅面图纸相当于2张A1幅面图纸。

A、对

B、错

通过模拟电话拨号上网的数据传输速率最有可能是（）。

A、1到56Kbps

B、64到500Kbps

C、500到1500Kbps

D、1.5到10Mbpd

A user receives an email slating that their account was compromised and there is a need to verify account credentials by submitting the correct information on a website. Which of the following security threats is occurring?（）

A、Phishing

B、Smurf attack

C、Denial of service

D、Man-in-the-middle

New service from the telephone company is delivered over fiber, but the technician does not have a fiber module for the router. Which of the following would remedy this issue?（）

A、OTDR

B、Media converter

C、CSU/DSU

D、Fiber repeater

要求在通话测试过程中掉话率不得高于（）（包括室内外的切换）。

A、1%

B、2%

C、5%

D、8%