能增加混凝土和易性，同时减少施工难度的混凝土外加剂有()。

A.Record the solution in the appropriate logs for future use.

B.Ask the user who reported the issue what past documentation they have.

C.Ask the user who reported the issue to explain the symptoms in detail.

D.Record what steps should be taken to resolve the issue.

A. Switching loop

B. Broadcast storm

C. IP conflict

D. Routing loop

red touse a static IP address. The technician notes the following configuration:Which of the following changes will allow the desktop to communicate properly with remote networks？（）

A. Changing the DNS to 172.16.1.100

B. Changing the WINS server to 172.174.136

C. Changing the netmask to 255.255.255.0

D. Changing the default gateway to 172.16.3.1

t are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command.In which OSI layer is the problem most likely occurring？（）

A. Physical

B. Data link

C. Network layer

D. Transport layer

E. Application layer

e Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version？（）

A. Router#copy tftp flash

B. Router(config)#restore flash

C. Router(config)#repair flash

D. Router#copy flash run

E. Router>copy start flash

F. Router#copy start flash

that theuser can access other Internet pages. According to network troubleshooting methodology, which of the following steps should be taken NEXT？（）

A. Remotely connect to the user‘s laptop and review the network configuration settings

B. Ping the web server from inside the network to ensure it is still up and running.

C. Check to make sure the company‘s website is accessible from the Internet.

D. Ensure the Ethernet cable is securely plugged into the user‘s laptop

ghts on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

A.the session layer

B.the protocol layer

C.the data link layer

D.the access layer

E.the network layer

F.the application layer

A. Allow the user to demonstrate expertise.

B. Do not argue; empathize with the user, and offer to help.

C. Ask the user to watch as the technician diagnoses and corrects the problem.

D. Document each of the steps to replicate at a later time.

y link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the 7-layer OSI model does the problem most likely exist？

A. The data link layer

B. The application layer

C. The protocol layer

D. The access layer

E. The session layer

F. The network layer

G. None of the above