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【单选题】

Which OSI layer is associated with the following: The acknowledgement of transmissions, sequencing, and flow control across a network?（）

A、Layer 2

B、Layer 3

C、Layer 4

D、Layer 5

E、Layer 6

F、Layer 7

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第1题
[单选题] Which of the following layers of the OSI model is the presentation layer?（）

A、Layer 1  B、Layer 5  C、Layer 6  D、Layer 7  

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第2题
[单选题] At which of the following OSI model layers is HTTPS encryption performed?（）

A、Layer 3  B、Layer 5  C、Layer 6  D、Layer 7  

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第3题
[] Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（） Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）

A、A.data link layer  B、B.application layer  C、C.access layer  D、D.session layer  E、E.network layer  

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第4题
[] Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（） Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）

A、A.data link layer  B、B.application layer  C、C.access layer  D、D.session layer  E、E.network layer  

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第5题
[单选题] Which layer in the OSI model is responsible for translating frames into bits?（）

A、Application Layer  B、Presentation Layer  C、Data Link Layer  D、Physical Layer  

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第6题
[单选题] While troubleshooting a network connectivity problem, a technician observes steady 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 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  

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第7题
[] A TestKing.com technician is troubleshooting connectivity problems between two routers that 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 TestKing.com technician is troubleshooting connectivity problems between two routers that 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、A. Physical  B、B. Data link  C、C. Network layer  D、D. Transport layer  E、E. Application layer  

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第8题
[单选题] At which layer of the OSI model dose PPP perform?（）

A、Layer 3  B、Layer 4  C、Layer 2  D、Layer 5  

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第9题
[单选题] At which layer of the OSI model dose PPP perform?（）

A、Layer 3  B、Layer 4  C、Layer 2  D、Layer 5  

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