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Description
| SESSION | NOVEMBER 2024 |
| PROGRAM | BACHLOR OF COMPUTER APPLICATIONS (BCA) |
| SEMESTER | III |
| COURSE CODE & NAME | DCA2104 BASICS OF DATA COMMUNICATION |
SET-I
- Explain the seven layers of OSI model with suitable diagram
Ans 1.
Seven Layers of the OSI Model
The Open Systems Interconnection (OSI) model is a conceptual framework used to understand and implement networking protocols in seven distinct layers. Each layer has specific responsibilities and interacts with the layers above and below it. This systematic approach enhances communication efficiency and interoperability between systems.
- Physical Layer
The Physical Layer is the foundation of the OSI model. It deals with the physical transmission of data over a
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2a. Differentiate between simple periodic analog signal and a composite periodic analog signal.
- Differentiate between parallel and serial transmission
Ans 2.
- Simple Periodic Analog Signal
A simple periodic analog signal is a single-frequency sine wave that oscillates at a constant rate. These signals are described mathematically by their amplitude, frequency, and phase. A key characteristic of simple periodic signals is that they are continuous and predictable, making them easy to analyze and understand. Examples of simple periodic analog signals include a pure tone generated by a tuning
3a. Describe line of sight transmission.
- Describe the structure of packet switches.
Ans 3.
- Line of Sight Transmission
Line of sight (LOS) transmission refers to a method of communication where a direct, unobstructed path exists between the transmitting and receiving devices. This type of transmission is commonly used in wireless communication technologies, such as microwave, infrared, and satellite communication systems. The effectiveness of LOS transmission relies heavily on the absence of physical barriers like buildings, mountains, or trees that can block or interfere with the signal.
In LOS transmission
SET-II
- Explain wavelength division multiplexing
Ans 4.
Wavelength Division Multiplexing (WDM)
Wavelength Division Multiplexing (WDM) is a critical technology in fiber optic communication that enables the simultaneous transmission of multiple data streams over a single optical fiber. By utilizing different wavelengths (or colors) of light, WDM allows for efficient use of the fiber’s bandwidth, significantly increasing its data-carrying capacity. This innovative approach has become a
- Explain high level data link control protocol (HDLC)
Ans 5.
High-Level Data Link Control Protocol (HDLC)
High-Level Data Link Control (HDLC) is a widely used communication protocol for managing and controlling data transmission over a network’s data link layer. As a protocol standardized by the International Organization for Standardization (ISO), HDLC ensures reliable and efficient data exchange between devices by providing mechanisms for framing, error detection, flow control, and synchronization. It is especially suited for point-to-point and multipoint
6a. Explain framing and four different framing method.
- Differentiate between switched ethernet and full duplex ethernet.
Ans 6.
- Framing and Four Different Framing Methods
Framing is a fundamental process in data communication that involves dividing a continuous stream of data into manageable units called frames. These frames are transmitted sequentially from the sender to the receiver. Framing is crucial for ensuring the integrity and efficiency of data transfer, as it allows the receiver to distinguish between individual messages and detect errors. Each frame typically contains a header, payload (data), and trailer, which includes error-checking