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

第1题

[简答题] You work as a network technician at Certkiller .com. Your boss， Mrs. Certkiller， is interested in WAN Services.Match the appropriate WAN Services with the correct service type.

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第2题

[单选题] When designing the WAN module within the enterprise edge, which document is used to specify the connectivity and performance agreements with the service provider?（）

A、RFP B、RFC C、SLC/SLA D、SOW

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第3题

[判断题] 离心沉降速度ut与重力沉降速度ut的主要区别之一是ut不是定值，而ut则是恒定的。

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第4题

[单选题] Which statement correctly describes a situation in which VRFs are used in the data center?（）

A、Partitioning of network resources is enabled. B、VRFs cannot support path isolation from MAN/WAN designs. C、VRFs cannot be used to map a virtualized data center to a MPLS implementation. D、VRFs do not allow for the use of application services with multiple access topologies. E、An access design using a VRF allows for an aggregation layer service module solution.

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第5题

[填空题] 施密特触发器具有（）特性，定义参数回差电压ΔUT=UT+-UT-。

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第6题

[多选题] Refer to the exhibit.Which two devices can be used to complete the connection between the WAN router atthe customer site and the service provider？（）

A、modem B、Frame Relay switch C、CSU/DSU D、WAN switch E、ISDN TA

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第7题

[单选题] Which WAN technology was designed to give homes and small business high speed digital dial-up service over already existing communication infrastructure?（）

A、X25 B、Frame Relay C、ATM D、ISDN E、ATX F、None of the above

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