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As a frame leaves a Layer 3 devi

题目

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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相似问题和答案

第1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


参考答案：D

第2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3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


参考答案：A, D

第4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5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6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7题：

What are some common layer 2 encapsulations for a WAN link?（）

  • A、Ethernet
  • B、PPP
  • C、Token Ring
  • D、HDLC
  • E、Frame Relay
  • F、POTS

正确答案:B,D,E

第8题：

What are some common layer 2 encapsulations for a WAN link?()

A. Ethernet

B. PPP

C. Token Ring

D. HDLC

E. Frame Relay

F. POTS


参考答案：B, D, E

第9题：

Which three MPLS statements are true？（）

  • A、Cisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.
  • B、Frame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.
  • C、MPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.
  • D、OSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.
  • E、The control plane is responsible for forwarding packets.
  • F、The two major components of MPLS include the control plane and the data plane.

正确答案:A,D,F

第10题：

Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three.)（）

  • A、HDLC
  • B、Ethernet
  • C、Token Ring
  • D、PPP
  • E、FDDI
  • F、Frame Relay

正确答案:A,D,F

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