A.數(shù)據(jù),數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特 B.比特,數(shù)據(jù)幀,數(shù)據(jù)包,數(shù)據(jù)段,數(shù)據(jù) C.數(shù)據(jù)包,數(shù)據(jù)段,數(shù)據(jù),比特,數(shù)據(jù)幀 D.數(shù)據(jù)段,數(shù)據(jù)包,數(shù)據(jù)幀,比特,數(shù)據(jù)
A.報文交換 B.分組交換 C.幀中繼交換和信元交換 D.以上全部
A.100m B.150m C.250m D.1000m