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Data Communication Oral Questions 1) which of these devices is used to convert digital data to analog signal? a) Modern b) Telephone c) Codec d) none 2) If we have a signal with size= 2 multiplied by unit step signal at t=0 then the size of output signal equals a) 2 b) -2...

Data Communication Oral Questions 1) which of these devices is used to convert digital data to analog signal? a) Modern b) Telephone c) Codec d) none 2) If we have a signal with size= 2 multiplied by unit step signal at t=0 then the size of output signal equals a) 2 b) -2 c) zero d) none 3) The segment PDU is in …….. layer a) Network b) Transport c) Data Link c) Physical 4) Hub device operates in ……. Layer a) Physical b) Data Link c) Network d) Application 5) A signal that has a value of specific points in time is called ……. a) Discrete b) Continuous c) Analog d) none 6) If we have 6 nodes in fully mesh topology then we need ……..connections a) 15 b) 30 c) 60 d) none 7) The Transmission of IP datagrams over Ethernet Network, what value assigned……….hex a) 0800 b) 0806 c) 8035 d) none 8) To convert from digital signal to analog signal we use ……… a) Modern b) Telephone c) Codec d) none 9) Modems produce signals in the voice-frequency range from ………. a)100-200HZ b) 300-3400HZ c) 300-4300HZ d) none 10) We can from packet PDU of data in …….. layer a) Network b) Transport c) Data Link c) Physical 11) Repeater device operates in ……. layer a) Network b) Physical c) Data Link c) Transport 12) UTP straight cable can connect …… a) PC-Switch b) Tow PC c) PC-Router d) none 13) A signal that has a value at all instances is called …….. a) Discrete b) Continuous c) Analog d) Null 14) ) UTP straight cable can connect two switches a) True b) False 15) …….. layer describes the mechanical , electrical, functional , and procedural means to transmit bits across physical connections a) Physical b) Transport c) Network d) Application 16) Which component of the communication system is used for capturing physical phenomena into an electrical signal? a) Transducer b) Transmitter c) Transmission media b) Receiver 17) The operation of CSMA/CD bus is used in…network a) Wireless b) Mobile c) Wired d) none 18) If we have 15 nodes in fully mesh topology then we need …. connections a) 225 b) 210 c) 105 d) none 19) MAC address is used in …….. layer a) Data Link b) Network c) Application d) Transport 20) TCP and UDP protocols are used in ……layer a) Data Link b) Network c) Application d) Transport 21) The operation of CSMA/CD bus is used in….network a) Wireless b) Ethernet c) Wired d) none 22) In the IEEE 802.3 the FCS or the CRC is …..bytes a) 2 b) 4 c) 8 d) none 23) When a delay happen to a signal that because there is …….. was added a) Positive t b) Negative t c) none 24) When SNR is increased …… is decreased a) BER b) Signal c) Distance d) none 25) Hub is used in connections in which layer……. a) Data Link b) Network c) physical d) Transport 26) How many bits in MAC address …… a) 6 b) 48 c) 52 b) 16 27) An increase in Signal to noise ration SNR decreases bit error rate? a) True b) False