Test : Unit 4 Data Communication & Network Part2

WAN stands for Wide Area Network, which is a type of network that can connect devices over a large geographical area, such as different cities or even countries. Unlike LAN (Local Area Network) and MAN (Metropolitan Area Network), which have limited coverage, WAN can connect devices over long distances, making it the network type that can connect the farthest. PAN (Personal Area Network) is a network that connects devices within a very short range, such as within a person's personal space, so it is not capable of connecting devices over long distances like WAN.

Firewall is a system that helps protect an organization's internal network from external intrusions. It acts as a barrier between the internal network and the outside world, monitoring and controlling incoming and outgoing network traffic. It examines the data packets and determines whether to allow or block them based on predefined security rules. By doing so, firewalls prevent unauthorized access and protect sensitive information from being compromised. Therefore, choosing a firewall as a security system is essential for safeguarding an organization's network from external attacks.

The correct answer is "สัญญาณแอนะล็อก" (Analog signal). This is because radio broadcasts typically use analog signals to transmit sound waves. Analog signals are continuous and vary in amplitude and frequency, allowing for the transmission of audio signals. Digital signals, on the other hand, are discrete and represent information as a series of 0s and 1s, which are not typically used for radio broadcasts.

A LAN (Local Area Network) is a network that connects computers and devices within a small geographical area, such as a single building or office. It is used to facilitate communication and data sharing between different departments or units within an organization. Therefore, the correct answer is LAN.

The correct answer is "รับและส่งข้อมูลจากการ์ดเสริมในระบบต่าง ๆ" which means "receive and transmit data from peripheral cards in various systems". This option accurately describes the role of a slot in a bus system, which is to facilitate the transfer of data between the main system and peripheral devices through expansion cards.

The benefit of a Mesh Topology network is that it allows for fast and efficient data transmission. In a Mesh Topology, each computer is connected directly to every other computer in the network, creating multiple paths for data to travel. This means that data can be transmitted quickly and efficiently, as it can take the shortest and fastest route to its destination. Therefore, the statement "รับและส่งข้อมูลได้รวดเร็ว" (able to receive and transmit data quickly) is a correct explanation for the given question.

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การสื่อสารข้อมูลแบบแพ็กเก็ต (Package) เกี่ยวพันกับการส่งข้อมูลระดับ Data Link, Application และ Physical โดย Data Link รับผิดชอบในการส่งข้อมูลระหว่างเครื่องคอมพิวเตอร์ในเครือข่ายเดียวกัน Application รับผิดชอบในการส่งข้อมูลระหว่างโปรแกรมแอพพลิเคชั่น และ Physical รับผิดชอบในการส่งข้อมูลทางกายภาพผ่านสื่อสัญญาณ เช่น สายเคเบิล หรือ สื่อสัญญาณไร้สาย ดังนั้น การสื่อสารแบบแพ็กเก็ต จะเกี่ยวพันกับการส่งข้อมูลระดับ Data Link, Application และ Physical

The correct answer is "แบบดาว" (star topology). In a star topology, all devices in a network are connected to a central device (such as a switch or hub). This central device acts as a point of communication for all devices, allowing them to send and receive data. This type of network topology is commonly used in school networks because it provides better performance, scalability, and ease of troubleshooting compared to other topologies like ring, bus, or tree.

PAN stands for Personal Area Network. Bluetooth technology is commonly used in PANs to connect devices within a short range, typically within a person's personal space. This technology allows for wireless communication between devices such as smartphones, tablets, laptops, and wearable devices. Therefore, it can be concluded that Bluetooth technology supports PANs.