Which two Ethernet fiber-optic modes support distances of greater than 550 meters?（）

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• Which two Ethernet fiber-optic modes support distances of greater than 550 meters？（）

  A . 1000BASE-CX B . 100BASE-FX C . 1000BASE-LX D . 1000BASE-SX E . 1000BASE-ZX

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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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  A . The parent policy-map shapes and the child policy-map queues. B . The mean-rate and burst-size must always be the same value. C . This will not work without a Dialer interface configured. D . The shaper provides congestion feedback.

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