In computer networking, which of the following is the most popular access method used in local area networks for sharing a common communication channel?

Introduction / Context:
This question focuses on basic computer networking concepts, especially how multiple devices share a common communication medium in a local area network. Access methods define how computers decide when they are allowed to send data on a shared channel. Several methods were developed historically, but one has become dominant in modern networks. Knowing its name is essential for understanding network topologies and for passing computer awareness exams.

Given Data / Assumptions:

• The question asks for a popular access method used in computer networks.
• Options include Ethernet, Token Ring, Bus Token, None of these and Satellite link.
• We assume a focus on local area networks in offices, schools and homes.
• We consider commonly deployed wired networking technologies.

Concept / Approach:
Ethernet is the most widely used networking technology for local area networks. It defines wiring standards, frame formats and, importantly, an access method that originally used carrier sense multiple access with collision detection, often abbreviated as CSMA or CSMA CD, to manage how devices take turns using the shared medium. Over time, Ethernet evolved from hubs and shared cables to switches and full duplex links, but the term Ethernet still refers to the dominant LAN technology. Token Ring and similar methods were used in some environments in the past but never matched Ethernet in popularity and have largely disappeared. Bus Token is not a standard term. Therefore, Ethernet is correctly described as the popular access method for computer networks in exam style questions.

Step-by-Step Solution:

Verification / Alternative check:
Network equipment such as switches, routers and network interface cards are marketed as supporting various Ethernet speeds like 100 Mbps, 1 Gbps or 10 Gbps. Certification exams and training material refer to Ethernet as the primary LAN technology and describe Token Ring only as a historical alternative. Home internet connections over cable or fibre also terminate in Ethernet ports for local distribution. This broad and modern usage confirms that Ethernet is the correct choice for a popular access method, while the other options represent outdated or nonstandard technologies.

Why Other Options Are Wrong:

• Token Ring: Token Ring uses a token passing access method and was deployed mainly in older IBM networks. It is not the most popular method today.
• Bus Token: This term does not refer to a widely known or standardised network access technology and is likely included to confuse learners.
• None of these: Incorrect because Ethernet clearly qualifies as a popular access method.
• Satellite link: Satellite communication is a long distance transmission medium, not a LAN access method like Ethernet or Token Ring.

Common Pitfalls:
Some learners may focus on the word method and become uncertain, thinking only of CSMA or token passing. It helps to remember that Ethernet is associated with CSMA based access on shared media and remains the best known name for LAN technology. Another pitfall is to assume that all older technologies are equally important; in reality, Ethernet became the dominant standard, and exam questions usually highlight this fact. When in doubt and the question mentions a popular access method for computer networks, Ethernet is usually the safest and most accurate answer.

Final Answer:
The most popular access method used in local area computer networks is Ethernet.