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多項(xiàng)選擇題

Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet?（）

A.192.168.20.29
B.192.168.20.16
C.192.168.20.17
D.192.168.20.31
E.192.168.20.0

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單項(xiàng)選擇題

在ISDN網(wǎng)絡(luò)中，U接口定義在（）之間。

A.TE1和NT2
B.TE2和TA
C.NT1和ISDN網(wǎng)絡(luò)
D.NT1和NT2

多項(xiàng)選擇題

A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme? （）

A.255.255.255.0
B.255.255.255.128
C.255.255.252.0
D.255.255.255.224
E.255.255.255.192
F.255.255.248.0