单项选择题

Which of the following interfaces is used to connect analog devices to the Internet?（）

A.POTS
B.ATM
C.VDSL
D.SDSL

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多项选择题

Which of the following are common VPN transports? (Select TWO)（）

A.RDP
B.VNC
C.SSL
D.PPTP
E.RAS

单项选择题

A user reports sporadic connectivity with their wireless connection. A technician determines the
wireless speed reported by the laptop to be 1Mbps.
Which of the following is the MOST likely cause of this issue?（）

A. The client does not support 802.11n
B. Incorrect frequency on the client is being used
C. Incorrect encryption on the AP
D. The client distance from the AP

单项选择题

At which of the following layers does the ICMP protocol operate?（）

A.Layer 1
B.Layer 3
C.Layer 4
D.Layer 5