1. multiple packets are carried over multiple channels with code-division multiple access (CDMA) A.True B.False 2.a checksum is an error-detecting technique that is applied only to a message with eight bits A. True B. False 3.if the codeword of a packet is corrupted during transmission but the received work still matches a valid codeword, the error is _____ A. returned B. undetected C. deleted D. unnecessary 4.which of the following answers is not a line coding scheme? A. bi-level B. bipolar C. multilevel D. multitransition 5. what is the largest group in an analog hierarchy? A.supergroup B.Master C.Group D.Jumbo