A.總線型網(wǎng)絡 B.環(huán)型網(wǎng)絡 C.星型網(wǎng)絡 D.有線網(wǎng)絡
A.4 B.7 C.5 D.6
A.物理層 B.數(shù)據(jù)鏈路層 C.傳輸層 D.應用層