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改变MS功率的命令和改变TA的命令在每一个下行的SACCH信息块所带的（）传送给MS。
- A、第一层的报头（Layer 1 Header）
- B、第二层的报头（Layer 2 Header）
- C、第三层的报头（Layer 3 Header）
- D、第四层的报头（Layer 4 Header）
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更多 “改变MS功率的命令和改变TA的命令在每一个下行的SACCH信息块所带的（）传送给MS。A、第一层的报头（Layer 1 Header）B、第二层的报头（Layer 2 Header）C、第三层的报头（Layer 3 Header）D、第四层的报头（Layer 4 Header）” 相关考题
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In a Bridged 1483 network, what Layer 2 encapsulations are passed between the DSL bridge and the ERX?()
A. single ATM headerB. single Ethernet headerC. ATM header followed by a PPP headerD. ATM header followed by an Ethernet header
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On which destination port in the Layer 4 header does BGP listen?()
A. UDP port 169B. TCP port 169C. UDP port 179D. TCP port 179
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Routers perform the decision process that selects what path a packet takes. These （ ） layer devices participate it the collection and distribution of network-layer information, and perform Layer 3 switching based on the contents of the network layer （ ） of each packet. You can connect the routers directly by point-to-point （ ） or local-area networks, or you can connect them by LAN or WAN switches. These Layer 2 switches unfortunately do not have the capability to hold Layer 3 （ ） information or to select the path taken by a packet through analysis of its Layer 3 destination address. Thus, Layer 2 switches be involved in the Layer 3 packet （ ） decision process.A.application B. network C.physical D.link A.header B.connection C.protocol D.data A.medium B.links C.switches D.carriers A.network B.links C.protocol D.routing A.switching B.processing C.forwarding D.connecting
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Which OSI layer header contains the address of a destination host that is another network?()
A. applicationB. presentationC. sessionD. transportE. networkF. data linkG. physical
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Which OSI layer header contains the address of a destination host that is another network?（）A、applicationB、presentationC、sessionD、transportE、networkF、data linkG、physical
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Which three statements about classification marking of traffic at Layer 2 are true？ （）A、a Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS）B、an ATM header includes a 1-bit DE field to provide the CoSC、an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoSD、the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is usedE、in the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoSF、in the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS
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Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic？ （）A、VPN traffic needs to be classified based on the Layer2 header informationB、VPN traffic needs to be classified based on the IP precedence or DSCPC、VPN traffic needs to be classified based on IP flow or Layer 3 information， such as source and destination IP addressD、VPN traffic with Authentication Header （AH） needs to preserve the ToS byte
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In a frame ，the MPLS label is imposed（）.A、After the Layer3 header and before Layer2 headerB、After the Layer2 header and before Layer3 headerC、Within the Layer 3 headerD、Before the layer 2 header
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添加图层蒙版的方法是（）。A、执行“Layer/DisableLayers”命令B、执行“Layer/EnableLayersMask”命令C、执行“Layer/AddLayerMask”命令D、执行“Layer/RemoveLayerMask”命令
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Which statement is true about IP telephony calls？（）A、 A Voice over IP （VoIP） packet consists of the voice payload， IP header， TCP header， RTP header， and Layer 2 link header.B、 The voice carrier stream uses H323 to set up， maintain， and tear down call endpoints.C、 Call control signaling uses Real-Time Transport Protocol （RTP） packets that contain actual voice samples.D、 The sum of bandwidth necessary for each major application， including voice， video， and data， should not exceed 75 percent of the total available bandwidth for each link.
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Which two statements about an interface configured with the asr-group command are correct?（）A、The FWSM supports up to 16 asymmetric routing groups.B、If a matching packet is not found, the packet is dropped.C、Asymetric routing of return traffic is enabled.D、If a matching packet is found, the Layer 3 header is rewritten.E、If a matching packet is found, the Layer 3 header is rewritten and the packet is forwarded to the default gateway.
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Which header or set of headers does CRTP compress？ （）A、Layer 2B、Layer 3C、Layer 4D、Layer 2 and Layer 3E、Layer 3 and Layer 4
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What is true about Quality of Service （QoS） for VPNs？（）A、QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNsB、QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNsC、QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNsD、the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfacesE、with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header
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Where is the MPLS label imposed？（）A、after the Layer 3 header and before the Layer 2 payloadB、after the Layer 3 header and before the Layer 4 payloadC、after the Layer 2 header and before the Layer 1 payloadD、after the Layer 1 header and before the Layer 2 payloadE、after the Layer 2 header and before the Layer 3 payload
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In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）A、Inserted between the MPLS label stack and the Layer 3 payloadB、Inserted between the MPLS label stack and the Layer 3 HeaderC、Inserted between the MPLS label stack and the Layer 2 payloadD、Inserted between the MPLS label stack and the Layer 2 header
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Which traffic descriptor is used for marking？ （）A、weighted RED （WRED） orange or green labelsB、modular QoS CLI （MQC） application layer tagsC、Deficit Round Robin （DRR） precedence bitsD、header compression tagsE、MPLS experimental bitsF、FIFO Layer 2 descriptor labels （L2DL）
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In a Bridged 1483 network, what Layer 2 encapsulations are passed between the DSL bridge and the ERX?（）A、single ATM headerB、single Ethernet headerC、ATM header followed by a PPP headerD、ATM header followed by an Ethernet header
考题
On which destination port in the Layer 4 header does BGP listen?（）A、UDP port 169B、TCP port 169C、UDP port 179D、TCP port 179
考题
单选题添加图层蒙版的方法是（）。A
执行“Layer/DisableLayers”命令B
执行“Layer/EnableLayersMask”命令C
执行“Layer/AddLayerMask”命令D
执行“Layer/RemoveLayerMask”命令
考题
单选题Which OSI layer header contains the address of a destination host that is another network?（）A
applicationB
presentationC
sessionD
transportE
networkF
data linkG
physical
考题
多选题Which three statements about classification marking of traffic at Layer 2 are true？ （）Aa Frame Relay header includes a 1-bit discard eligible （DE） bit to provide the class of service （CoS）Ban ATM header includes a 1-bit DE field to provide the CoSCan MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoSDthe CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is usedEin the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoSFin the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS
考题
单选题Where is the MPLS label imposed？（）A
after the Layer 3 header and before the Layer 2 payloadB
after the Layer 3 header and before the Layer 4 payloadC
after the Layer 2 header and before the Layer 1 payloadD
after the Layer 1 header and before the Layer 2 payloadE
after the Layer 2 header and before the Layer 3 payload
考题
单选题数据报穿越路由器前往目标主机的过程中，（）。A
在每次穿越路由器的时候，其帧报头保持不变，而IP报头要被改变B
在每次穿越路由器的时候，其帧报头要被改变，而IP报头保持不变C
在穿越路由器的时候，其帧报头不被改变，而IP报头进入不同网络要随之改变D
在每次穿越路由器的时候，其帧报头和IP报头都被改变
考题
单选题On which destination port in the Layer 4 header does BGP listen?（）A
UDP port 169B
TCP port 169C
UDP port 179D
TCP port 179
考题
多选题Which two statements about an interface configured with the asr-group command are correct?（）AThe FWSM supports up to 16 asymmetric routing groups.BIf a matching packet is not found, the packet is dropped.CAsymetric routing of return traffic is enabled.DIf a matching packet is found, the Layer 3 header is rewritten.EIf a matching packet is found, the Layer 3 header is rewritten and the packet is forwarded to the default gateway.
考题
单选题Which header or set of headers does CRTP compress？ （）A
Layer 2B
Layer 3C
Layer 4D
Layer 2 and Layer 3E
Layer 3 and Layer 4
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