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單項選擇題

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

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多項選擇題

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

單項選擇題

下列是外部網(wǎng)關(guān)路由協(xié)議的是（）。

A.rip
B.ospf
C.igrp
D.bgp
E.eigrp