Test: Introduction & IP Addressing- 1 - Computer Science Engineering (CSE) MCQ

Protocols is a set of rules. It is an agreement between the communicating parties on how communication should proceed.

In simplex mode, transmission takes place in one direction.
In duplex mode, transmission take place simultaneously in both direction.
In half-duplex transmission take place in both direction but not at the same time.

Unmodulated signal coming from a transmitter is known as baseband signal.

1. Session layer provide organised means to exchange data between uses.
2. Layer support an end user process and performs required file transfer.
3. Transport layer provides end to end connectivity.
4. Medium dependent interface connects DOC into physical channel.

Hence option B is correct.

Baseband transmission typically use digital signalling over a single wire. Using this, it is possible to transmit multiple signals on a single cable by time-division multiplexing. In broadband transmission multiple channels are created using frequency-division multiplexing.

• Residual-bit error rate is a receive-quality metric in digital transmission, one of several used to quantify the accuracy, of the received data.
• It measures the number of lost or garbled message as a fraction of the total sent in the sampling period.

Hence option A is correct.

OSI model layer division is as application layer, session layer, transport layer, network layer, data- link layer, physical layer. Hence the ISO level which is more closely related to the physical communication facilities is data link layer among other given layers.

In half-duplex mode the transmission is takes place in both direction, but only in one direction at a time.
Hence, railway track is an example of this half-duplex mode.

Data link layer: It is associated with the detection and recovery from the errors in the transmitted data.
Physical layer: It is the lowest layer whose function is to activate, deactivate and maintain the circuit between Data Terminal Equipment (DTE).
Presentation layer: It is concerned with the syntax and semantics of the information exchanged between two systems.
Network layer: This layer has some specific responsibilities:
(i) Logical addressing [communication]
(ii) Routing

Modem stands for modulator/demodulator. Modulator converts a digital signal into an analog signal using ASK, FSK, PSKorGAM. Demodulator converts an analog signal into a digital signal.