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

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

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  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 CoS C . an MPLS EXP field is inserted in the Layer 3 IP precedence field to identify the CoS D . the CoS field only exists inside Ethernet frames when 802.1Q or Inter-Switch Link （ISL） trunking is used E . in the IEEE 802.1p standard， three bits are used to identify the user priority bits for the CoS F . in the IEEE 802.1q standard， six bits are used to identify the user priority bits for the CoS

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  A . Frame Relay B . HDLC C . x.25 D . PPP

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  A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

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  A . Flex Links B . loop-free U C . looped square D . looped triangle E . loop-free inverted U

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• Which command alone will disable trunking on a Layer 2 switch port？（）

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• 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

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• Which three statements accurately describe layer 2 Ethernet switches?（）

  A . Microsegmentation decreases the number of collisions on the network. B . if a switch receives a frame for an unkown destination,it uses ARP to resolve the address. C . Spanning Tree Protocol allows switches to automatically share vlan information. D . In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port. E . Establishing vlans increases the number of broadcast domains. F . Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.

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