Free Microsoft Networking Essentials Question and Answers — Questions and Answers
Question 1: What layer of the Open Systems Interconnection (OSI) paradigm offers applications a way to access the protocol stack?
- Network
- Application (Correct answer)
- Data-link
- Session
Correct answer: Application
The Application layer (Layer 7) is the topmost layer of the OSI model and serves as the interface between user applications and the network services. It provides the protocols and services that applications use to communicate over the network, such as HTTP for web browsing or SMTP for email. This layer is where users directly interact with network-enabled applications.
Question 2: What kind of signal do copper cables normally use?
- Electrical (Correct answer)
- Fiber-optic
- Infrared
- Microwave
Correct answer: Electrical
Copper cables, such as Ethernet twisted-pair cables, transmit data using electrical signals. These signals are variations in voltage or current that represent binary data (bits). This method is effective for relatively short distances and is widely used in local area networks due to its cost-effectiveness and ease of installation.
Question 3: What kind of network is often contained within a constrained region of space, such as a single room, floor, or building?
- WAN
- MAN
- LAN (Correct answer)
- CAN
Correct answer: LAN
A Local Area Network (LAN) is a computer network that interconnects computers within a limited geographical area, such as a home, school, office building, or a campus. LANs are characterized by their high data transfer rates and their ability to connect devices over relatively short distances. This contrasts with WANs (Wide Area Networks) which cover larger geographical areas.
Question 4: You have been engaged by a small business to construct its network. There are 10 users on the network, and they all need to share resources and data. The network you select should utilize collision-free Media Access Control (MAC) and support baseband signaling and a star topology. Determine the suitable data-link layer protocol and the channel access strategy that this protocol should employ in light of this information.
- Token Ring (Correct answer)
- Internet Protocol (IP)
- Fiber-optic
- Ethernet
Correct answer: Token Ring
Token Ring is a data-link layer protocol that inherently provides collision-free Media Access Control (MAC) by using a token-passing mechanism. In a Token Ring network, a token circulates, and only the device holding the token can transmit data, preventing collisions. While often associated with a physical ring, it can operate over a star-wired physical topology using a Multi-Station Access Unit (MSAU), and it uses baseband signaling.
Question 5: Which layer of the Open Systems Interconnection (OSI) model adds a header and a footer to the data that is transmitted from an upper layer, generating a frame?
- Application
- Network
- Data-link (Correct answer)
- Physical
Correct answer: Data-link
The Data-link layer (Layer 2) is responsible for framing, which involves adding a header and a footer to the network layer's packet to create a frame. This frame includes information like source and destination MAC addresses, error detection codes, and frame delimiters. The header and footer allow for reliable transmission of data across a physical link.
Question 6: In what layer of the Open Systems Interconnection (OSI) paradigm do applications typically get connectionless or connection-oriented services?
- Data-link
- Transport (Correct answer)
- Physical
- Network
Correct answer: Transport
The Transport layer (Layer 4) is responsible for providing end-to-end communication services, including both connection-oriented (like TCP) and connectionless (like UDP) services. Connection-oriented services ensure reliable, ordered delivery of data, while connectionless services prioritize speed over reliability. This layer segments data from the application layer and adds port numbers for process-to-process communication.
Question 7: What layer of the Open Systems Interconnection (OSI) model specifies the network's medium, interfaces, hardware for connecting devices, and signaling techniques?
- Data-link
- Transport
- Network
- Physical (Correct answer)
Correct answer: Physical
The Physical layer (Layer 1) is the lowest layer of the OSI model and deals with the physical aspects of network communication. It defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between network devices. This includes specifying the type of cabling, connectors, voltage levels, and signaling methods used to transmit raw bits.
Free Microsoft Networking Essentials Question and Answers
What layer of the Open Systems Interconnection (OSI) paradigm offers applications a way to access the protocol stack?