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A computer network is a set of devices, known as nodes, connected by communication links. Nodes can include computers, printers, or any device capable of sending and receiving data.
The main types of computer networks include Local Area Networks (LAN), Wide Area Networks (WAN), Metropolitan Area Networks (MAN), and Personal Area Networks (PAN). Each type serves different geographical areas and purposes.
The OSI model provides a framework for understanding and designing network protocols. It consists of seven layers, each responsible for specific functions in the communication process.
The TCP/IP model is a set of communication protocols used for the Internet and similar networks. It consists of four layers: Application, Transport, Internet, and Network Interface.
The OSI model has seven layers, while the TCP/IP model has four. The TCP/IP model is more widely used in practice, while the OSI model is often used as a teaching tool.
The physical layer is responsible for the transmission of raw bitstreams over a physical medium. It defines the hardware elements involved in the communication process, such as cables and switches.
Guided transmission media include physical cables like copper and fiber optics, while wireless transmission media use electromagnetic waves to transmit data without physical connections.
Sliding window protocols are used in data link layer communications to manage the flow of data packets between sender and receiver. They allow multiple packets to be sent before needing an acknowledgment.
Error detection and correction ensure that data transmitted over a network is accurate and complete. Techniques like checksums and parity bits are used to identify and correct errors.
Connection-oriented protocols establish a connection before data transfer, ensuring reliable communication, while connectionless protocols send data without establishing a connection, which can lead to less reliability.
Routing protocols determine the best path for data to travel across a network. Examples include Distance Vector Routing and Link State Routing, which help manage how data packets are forwarded.
IP addressing assigns unique identifiers to devices on a network, allowing them to communicate. IPv4 and IPv6 are the two main versions of IP addresses, with IPv6 designed to replace IPv4 due to address exhaustion.
The transport layer provides end-to-end communication services for applications. It is responsible for error control, flow control, and ensuring complete data transfer between devices.
TCP (Transmission Control Protocol) is connection-oriented and ensures reliable data transfer, while UDP (User Datagram Protocol) is connectionless and does not guarantee delivery, making it faster but less reliable.
The application layer provides network services directly to end-user applications. It includes protocols like HTTP for web browsing, SMTP for email, and DNS for domain name resolution.
E-commerce refers to the buying and selling of goods and services over the Internet. It has grown rapidly due to advancements in technology and the increasing use of online platforms.
Social issues include privacy concerns, censorship, and the ethical implications of data sharing. These issues arise from the ease of communication and the potential for misuse of information.
Phishing is a type of social engineering attack where an attacker masquerades as a trusted entity to steal sensitive information, such as login credentials and credit card numbers, often through deceptive emails.
A botnet attack involves a network of compromised devices controlled by an attacker to perform malicious activities, such as distributed denial-of-service (DDoS) attacks, data theft, or sending spam.
The four fundamental characteristics are delivery, accuracy, timeliness, and jitter. These factors determine the effectiveness of data transmission in a network.
Location privacy is significant because mobile devices can track users' movements, raising concerns about surveillance and the potential misuse of location data by service providers.