单选题A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）A sessionB networkC PhysicalD data linkE Transport

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第4题：

A receiving host computes the checksum on a frame and determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen?（）

• A、session
• B、network
• C、physical
• D、datalink
• E、transport

正确答案:D

第5题：

Which WAN service utilizes two different encapsulation types (one for data and one for signaling) on its data link layer?（）

• A、ISDN
• B、Frame Relay
• C、ATM
• D、FDDI

正确答案:A

第6题：

Which of the following correctly describe steps in the OSI data encapsulation process?（）

• A、Transport layer divides a data stream into segments & adds reliability & flow control information
• B、Data link layer adds physical source & destination address & an FCS to the segment
• C、Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information
• D、Packets are created when the network layers adds layers 3 address & control information to a segment
• E、The presentation layer translated bits into bits into voltages for transmission across the physical link

正确答案:A,D

第7题：

A receiving host computes the checksum on a frame and  determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen？（）

• A、session
• B、network
• C、physical
• D、data link
• E、transport

正确答案:D

第8题：

A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?（）

• A、Data, Frame, Packet, Segment, Bit
• B、Data, Frame, Segment, Packet, Bit
• C、Data, Packet, Frame, Segment, Bit
• D、Data, Packet, Segment, Frame, Bit
• E、Data, Segment, Frame, Packet, Bit
• F、Data, Segment, Packet, Frame, Bit

正确答案:F

第9题：

In which of the following layers of the OSI model does the TCP protocol operate?（）

• A、Session
• B、Network
• C、Data link
• D、Transport

正确答案:D

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第15题：

Which of the following correctly describe steps in the OSI data encapsulation process?（）

• A、The transport layer divides a data stream into segments and may add reliability and flow control information.
• B、The data link layer adds physical source and destination addresses and an FCS to the segment.
• C、Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
• D、Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
• E、The presentation layer translates bits into voltages for transmission across the physical link.

正确答案:A,D

第16题：

A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）

• A、session
• B、network
• C、physical
• D、data link
• E、transport

正确答案:D

第17题：

At which OSI layer is a logical path created between two host systems（）。

• A、session
• B、transport
• C、network
• D、data link
• E、physical

正确答案:C

第18题：

At which layer of the OSI model is the optimal path to a network destination determined at?（）

• A、Data Link
• B、Session
• C、Physical
• D、Presentation
• E、Network
• F、Transport

正确答案:E

第19题：

At which layer of the OSI model is RSTP used to prevent loops？（）

• A、data link
• B、network
• C、physical
• D、transport

正确答案:A

第20题：

Overlay Transport Virtualization （OTV） overlay interface is a logical multiaccess and multicast- capable interface that must be explicitly defined by the user and where the entire OTV configuration is applied. Which statements are true about OTV overlay interface？（）

• A、 When an OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the overlay interface.
• B、 The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the join interface toward the routed domain.
• C、 When the OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the join interface.
• D、 The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the overlay interface toward the routed domain.

正确答案:A,B

第21题：

when a user clicks a link in the left frame of the Review application, the linked data displays in the frame on the right. What did Kristin to do allow this to happen?（）

• A、entered the name of the target frame in hotspot properties
• B、entered the name of the target in frameset properties
• C、entered the position of the target frame in frame properties
• D、entered the position of target frame in hotspot properties. a name other than location

正确答案:C

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