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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单项选择题

If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）

A.IPSec VPN
B.QoS mechanism
C.Firewall
D.NAT
E.EIGRP routing protocol
F.Static routing

多项选择题

You work as a network technician at Certkiller .com. Please study the exhibit carefully. All of the computing devices shown are on the same logical network， as if they were all connected to the same switch. Which two features make this possible？（）

A.PAT
B.802.1Q
C.Spanning-tree
D.VLANs
E.QoS

单项选择题

You are designing a solution that needs to support 30 IP phone users. Which switch model and how many switches does the Cisco Single-Site Secure Network Foundation1.1 Desing and Implementation Guide suggest for the solution？（）

A.1 Catalyst Express 500G-12TC,1 Catalyst 3750G-12S-S
B.1 Catalyst 3750G-12S-S,1 Catalyst Express 500-24PC
C.2 Catalyst Express 500G-12TC
D.2 Catalyst 3750G-12S-S,1 Catalyst Express 500-24PC
E.2 Catalyst Express 500-24PC
F.2 Catalyst 3750G-12S-S