A.電力調(diào)度數(shù)據(jù)網(wǎng)B.公共電話(huà)網(wǎng)絡(luò)C.InternetD.微波系統(tǒng)
A.L2TPB.L2FC.MPLSD.IPSec
A.10Base-TB.100Base-TC.100Base-TX/FXD.1000Base-TX/FX