| ID | Qus | A | B | C | D | Ans |
| 1 | In a _______ connection, more than two devices can share a single link | Point-to-point | Primary | Multipoint | Secondary | C |
| 2 | Communication between a computer and a keyboard involves ______________transmission | Communication between a computer and a keyboard involves ______________
transmission | Half-duplex | Simplex | Automatic | C |
| 3 | In a network with 25 computers, which topology would require the most extensive cabling? | Star | Mesh | Bus | Ring | B |
| 4 | Which topology requires a central controller or hub? | Star | Mesh | Bus | Ring | A |
| 5 | The _______ is the physical path over which a message travels | Protocol | Medium | Signal | All of the above | B |
| 6 | Which organization has authority over interstate and international commerce in the communications field? | ITU-T | IEEE | ISO | FCC | D |
| 7 | The information to be communicated in a data communications system is the ________ | Medium | Protocol | Transmission | Message | D |
| 8 | Frequency of failure and network recovery time after a failure are measures of the _______ of a network | Performance | Security | Reliability | Feasibility | C |
| 9 | In _______ transmission, the channel capacity is shared by both communicating devices at all times | Full-duplex | Simplex | Half-duplex | Half-Simplex | A |
| 10 | An unauthorized user is a network _______ issue | Performance | Reliability | Security | All of the above | C |
| 11 | Which topology requires a multipoint connection? | Mesh | Star | Ring | Bus | D |
| 12 | A television broadcast is an example of _______ transmission | Half-duplex | Full-duplex | Simplex | Automatic | C |
| 13 | A _______ connection provides a dedicated link between two devices | Multipoint | Point-to-Point | Primary | Secondary | B |
| 14 | A cable break in a _______ topology stops all transmission | Mesh | Star | Primary | Bus | B |
| 15 | The _______ layer changes bits into electromagnetic signals | Physical | Transport | None of the above | Data link | A |
| 16 | The physical layer is concerned with the transmission of _______ over the physical medium | Programs | Protocols | Bits | Dialogs | C |
| 17 | Mail services are available to network users through the _______ layer | Data link | Physical | Application | Transport | C |
| 18 | As the data packet moves from the lower to the upper layers, headers are _______ | Added | Rearranged | Modified | Subtracted | D |
| 19 | As the data packet moves from the upper to the lower layers, headers are _______ | Removed | Added | Rearranged | Modified | B |
| 20 | The _______ layer lies between the network layer and the application layer | Data link | Physical | Transport | None of the above | C |
| 21 | Layer 2 lies between the physical layer and the _______ layer | Data link | Network | Transport | None of the above | B |
| 22 | When data are transmitted from device A to device B, the header from A's layer 4 is read by B's _______ layer | Application | Physical | Transport | None of the above | C |
| 23 | Which layer functions as a liaison between user support layers and network support layers? | Network layer | Transport layer | Physical layer | Application layer | B |
| 24 | What is the main function of the transport layer? | Process-to-process delivery | Node-to-node delivery | Synchronization | Updating and maintenance of routing tables | A |
| 25 | Which of the following is an application layer service? | Remote log-in | File transfer and access | Mail service | All the above | D |
| 26 | The Internet model consists of _______ layers | 3 | 5 | 7 | 8 | B |
| 27 | The process-to-process delivery of the entire message is the responsibility of the _______ layer | Physical | Network | Transport | Application | C |
| 28 | The _______ layer is the layer closest to the transmission medium | Network | Physical | Data link | Transport | B |
| 29 | Before data can be transmitted, they must be transformed to ________ | Electromagnetic signals | Periodic signals | Aperiodic signals | Low-frequency sine waves | A |
| 30 | When one of the components of a signal has a frequency of zero, the average amplitude of the signal ________ | Is less than zero | Is greater than zero | Is zero | (a) or (b) | B |
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