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om your PC command prompt, but the output shows "request times out."

At which OSI layer is this problem associated with？

A．The data link layer

B．The application layer

C．The access layer

D．The session layer

E．The network layer

Local PC IP address: 190.0.3.35/24Default Gateway: 190.0.3.1Remote Server: 190.0.5.250/24You then conduct the following tests from the local PC:Ping 127.0.0.1 - UnsuccessfulPing 190.0.3.35 - SuccessfulPing 190.0.3.1 - UnsuccessfulPing 190.0.5.250 - UnsuccessfulWhat is the underlying cause of this problem？（）

A. TCP/IP not correctly installed

B. Local physical layer problem

C. NIC not functioning

D. Remote physical layer problem

Local PC IP address: 10.0.0.35/24Default Gateway: 10.0.0.1Remote Sever: 10.5.75.250/24You then conduct the following tests from the local PC:Ping 127.0.0.1 – SuccessfulPing 10.0.0.35 – SuccessfulPing 10.0.0.1 – UnsuccessfulPing 10.5.75.250 – UnsuccessfulWhat is the underlying cause of this problem？（）

A.A remote physical layer problem exists.

B.The host NIC is not functioning.

C.TCP/IP has not been correctly installed on the host.

D.A local physical layer problem exists.

Local PC IP address: 190.0.3.35/24

Default Gateway: 190.0.3.1

Remote Server: 190.0.5.250/24

You then conduct the following tests from the local PC:

Ping 127.0.0.1 - Unsuccessful

Ping 190.0.3.35 - Successful

Ping 190.0.3.1 - Unsuccessful

Ping 190.0.5.250 – Unsuccessful

What is the underlying cause of this problem？

A．TCP/IP not correctly installed

B．Local physical layer problem

C．NIC not functioning

D．Remote physical layer problem

E．None of the above

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.A remote physical layer problem exists.

B.The host NIC is not functioning.

C.TCP/IP has not been correctly installed on the host.

D.A local physical layer problem exists.

Local PC IP address: 10.0.0.35/24 Default Gateway: 10.0.0.1 Remote Sever: 10.5.75.250/24 You then conduct the following tests from the local PC: Ping 127.0.0.1 – Successful Ping 10.0.0.35 – Successful Ping 10.0.0.1 – Unsuccessful Ping 10.5.75.250 – Unsuccessful What is the underlying cause of this problem？（）

A. A remote physical layer problem exists.

B. The host NIC is not functioning.

C. TCP/IP has not been correctly installed on the host.

D. A local physical layer problem exists.

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

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

discoversthat the machine loses connectivity when the wireless phone is being used. Which of the following WAPS should be installed to help resolve the issue？（）

A. 802.1 1g

B. 802.1X

C. 802.11n

D. 802.11b