A.企業(yè)內(nèi)部網(wǎng)和幀中繼網(wǎng) B.綜合業(yè)務(wù)數(shù)字網(wǎng)和數(shù)字數(shù)據(jù)網(wǎng) C.幀中繼網(wǎng)和企業(yè)內(nèi)部網(wǎng) D.公用分組交換網(wǎng)和幀中繼網(wǎng)
A.128.0.1.0 B.126.3.3.3 C.191.234.111.123 D.192.34.45.56
A.64516 B. 254 C.64518 D. 256