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

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

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多项选择题

A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased?（）

A. Erase flash.
B. Restart the switch.
C. Delete the VLAN database.
D. Erase the running configuration.
E. Erase the startup configuration.
F. Modify the configuration register.

多项选择题

A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?（）

A.ARP
B.CDP
C.DHCP
D.DNS
E.ICMP