Objective Type Questions On Computer Networks - Set 8

Following are the multiple choice question on Computer Network related concepts that are useful for the competitive exams like UGC-NET Exam, TET Exams etc.  1) Manchester code is a ?Bi- Polar code non return to zero codepolar codeB and CShow/Hide Answer Answer = D Explanation:No Explanation2) How many OSI layers are covered in the X.25 standard ? threetwosevensixNone of aboveShow/Hide Answer