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As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）

A、The data is moving from 10BASE-TX to 100BASE-TX.

B、The WAN encapsulation type has changed.

C、The data format has changed from analog to digital.

D、The source and destination hosts are in the same subnet.

E、The source and destination MAC addresses have changed.

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更多“As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）”相关的问题
第1题
[单选题] R1 forwards a packet from Host 1 to remote Server 1. Which statement describes the use of a MAC as the frame carrying this packet leaves the s0/0/0 interface of R1（）。

A、The frame does not have MAC addresses.  B、The source MAC address in the frame is the MAC address of the NIC of Host 1.  C、The source MAC address in the frame is the MAC address of the s0/0/0 interface of R1.  D、The destination MAC address in the frame is the MAC address of the NICof server 1.  E、The destination MAC address in the frame is the MAC address of the s0/0/0 interface of R2  

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第2题
[单选题] VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?（）

A、provide service internetworking  B、support transparency for Layer 2 frames  C、indicate destination as a connection identifier  D、map to the DLCI in service internetworking  

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第3题
[单选题] Before （）the harbour, all derricks must be secured properly.

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第4题
[单选题] Why will as witch never learn a broadcast address？（）

A、Broadcast frames are never sent to swiches.  B、Broadcast addresses use an incorrect format for the switching table.  C、A broadcast address will never be the source address of a frame.  D、Broadcasts only use network layer addressing.  E、A broadcast frame is never forwarded by a switch.  

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第5题
[单选题] When configuring Frame Relay using point-to-point subinterfaces, which of the following must not be configured?（）

A、The local DLCI on each subinterface of the Frame Relay.  B、The Frame Relay encapsulation on the physical interface.  C、An IP address on the physical interface.  D、The subinterface type as point-to-point  

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第6题
[] The Departure Report，required by vessels participating in AMVER，must be sent（）.

A、A.as soon as practicable on leaving port  B、B.prior to departure  C、C.within 24 hours of departure  D、D.within 12 hours of departure  

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第7题
[多选题] As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?（）

A、The data is moving from 10BASE-TX to 100BASE-TX.  B、The WAN encapsulation type has changed.  C、The data format has changed from analog to digital.  D、The source and destination hosts are in the same subnet.  E、The source and destination MAC addresses have changed.  

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第8题
[单选题] VLAN Tagging， also known as Frame Tagging， is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link， a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag？（）

A、 provide service internetworking  B、 support transparency for Layer 2 frames  C、 indicate destination as a connection identifier  D、 map to the DLCI in service internetworking  

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第9题
[单选题] A port is（）if the delay in leaving it would be such as to frustrate the adventure．

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