Test : Unit 4 Data Communication & Network

Explanation
The given statement is true. It states that communication of data refers to the exchange of information through communication devices. This means that data is transferred from one device to another using communication channels such as cables, wireless signals, or the internet. Communication of data is a fundamental concept in modern technology and is essential for various applications, including internet communication, telecommunication, and data sharing between devices.

Explanation
The statement is saying that information/data is not a fundamental component of the communication system. This statement is false because information/data is indeed a fundamental component of the communication system. Communication involves the transmission and exchange of information between two or more parties. Without information or data, there would be no meaningful communication.

Explanation
The given statement states that "สายชลร้องเพลงให้นางฟ้าฟัง" which means "Sai Chon sings a song for the angels to listen to." It then asks whether this communication is in the form of a song. The correct answer is True because the statement explicitly mentions that "สายชลร้องเพลง" which means "Sai Chon sings a song." Therefore, the communication is indeed in the form of a song.

Explanation
The statement suggests that sending data one bit at a time until completing one character is a characteristic of parallel data transmission. However, this is incorrect. Parallel data transmission involves sending multiple bits simultaneously over separate channels. The given statement describes serial data transmission, where data is sent one bit at a time. Therefore, the correct answer is false.

Explanation
A router is a networking device that connects networks together and forwards data packets between them. It acts as a link between different networks and facilitates the transmission of data to the destination devices. Therefore, the statement that routers connect networks together and forward data through different networks to the destination devices is true.

Explanation
The correct answer is true because a microwave with a directional antenna can only transmit signals in a straight line and cannot follow the curvature of the Earth or bend around obstacles. This is due to the nature of electromagnetic waves, which travel in straight lines unless they are reflected or refracted. Therefore, a microwave with a directional antenna cannot transmit signals that can bend or curve along the Earth's surface.

Explanation
Fiber optic cables are a type of cable that uses light signals to transmit data. These cables are made of thin strands of glass or plastic, which allows for the transmission of light signals over long distances without significant loss of signal quality. Therefore, it can be concluded that fiber optic cables are indeed a type of cable that uses electrical signals to transmit data.

Explanation
P2P Network มีลักษณะเป็นระบบเครือข่ายที่มีค่าใช้จ่ายในการติดตั้งและการบำรุงรักษาค่อนข้างสูง False. P2P Network หรือ Peer-to-Peer Network ไม่มีค่าใช้จ่ายในการติดตั้งและการบำรุงรักษาที่สูง เนื่องจากในระบบเครือข่ายแบบ P2P ไม่มีเซิร์ฟเวอร์กลางที่ต้องใช้ค่าใช้จ่ายในการติดตั้งและบำรุงรักษา แต่จะใช้ทรัพยากรของผู้ใช้ในเครือข่ายเพื่อแบ่งปันข้อมูลและบริการกันเอง ซึ่งทำให้มีค่าใช้จ่ายที่ต่ำกว่าระบบเครือข่ายแบบเซิร์ฟเวอร์-ไคลเอนต์