Computer Networks: Trivia Quiz

In most business LANs, the RJ-45 connector is used with twisted-pair networking cable. The RJ-45 connector is a standard connector used for Ethernet connections and is compatible with twisted-pair cables commonly used in LAN environments. It provides a secure and reliable connection, making it the preferred choice for networking in business settings. BNC connectors are commonly used for coaxial cables, RJ-11 connectors are used for telephone cables, and Type F connectors are used for coaxial cables in television and satellite systems.

Wireless signal transmission uses radio waves to carry signals. Radio waves are a type of electromagnetic radiation that can be used to transmit information wirelessly. This method is commonly used for communication purposes, such as in radio and television broadcasting, Wi-Fi networks, and cellular communication. It allows for the transmission of signals over long distances without the need for physical wires or cables.

Wireless as a media choice offers more host mobility, allowing devices to connect and communicate without being physically tethered to a fixed location. This flexibility enables users to move around freely while maintaining network connectivity, enhancing productivity and convenience. Unlike wired connections, wireless networks eliminate the need for cables, which can limit mobility. Therefore, more host mobility is considered a benefit of wireless media choice.

The physical layer of the OSI model is responsible for binary transmission, cable specification, and the physical aspects of network communication. This layer deals with the actual transmission of bits over the network medium, including the electrical, mechanical, and functional specifications for the physical interface between devices. It defines the physical characteristics of the network such as cables, connectors, voltage levels, and signaling techniques used for data transmission.

In LAN installations where potential electrical hazards or electromagnetic interference may be present, fiber optic cable is recommended for backbone cabling. Fiber optic cables are immune to electromagnetic interference and do not conduct electricity, making them a safe and reliable option in such environments. Additionally, fiber optic cables have a high bandwidth capacity and can transmit data over long distances without degradation, making them suitable for backbone cabling.

Crosstalk in unshielded twisted-pair copper wire networks is caused by the magnetic field around the adjacent pairs of wire. When data is transmitted through one pair of wires, the magnetic field generated can interfere with the adjacent pairs, leading to signal degradation and cross-interference. This is why proper cable management and separation of wire pairs is crucial to minimize crosstalk and maintain signal integrity.

Crosstalk in unshielded twisted-pair copper wire occurs due to the magnetic field generated by the adjacent pairs of wire. When data is transmitted through one pair of wire, it creates a magnetic field that can interfere with the adjacent pairs, causing signal degradation and cross-interference. This phenomenon is known as crosstalk. Shielding the adjacent wire pairs with braided wire would help reduce crosstalk, but in this case, the question specifically asks about the cause of crosstalk, which is the magnetic field. The reflection of the electrical wave and collision caused by two nodes using the media simultaneously are not related to crosstalk in this context.

Improperly applying a connector to a network cable can result in signal loss for the data transmitted through that cable. The connector ensures proper connection and continuity in the cable, allowing for efficient data transmission. If the connector is not properly applied, it can lead to a weak or unstable connection, causing signal loss. This can result in data packets being dropped or corrupted, leading to disruptions in the network communication.

The primary role of the Physical layer in transmitting data on the network is to create the signals that represent the bits in each frame onto the media. This involves converting the digital data into a format that can be transmitted over the physical medium, such as electrical or optical signals. The Physical layer is responsible for encoding and decoding the data, as well as handling issues related to data transmission, such as signal strength, modulation, and synchronization. By creating the signals, the Physical layer ensures that the data can be effectively transmitted and received by the devices on the network.

The correct answer is backbone cable. Backbone cable is the type of cable run that is most often associated with fiber-optic cable. Backbone cables are used to connect different areas within a building or between buildings, providing high-speed and long-distance communication. Fiber-optic cables are commonly used in backbone cable installations due to their ability to transmit large amounts of data over long distances with minimal loss of signal quality.

The twisting of the wires in the cable helps reduce the effects of interference. Twisting the wires creates a balanced transmission line, which helps cancel out electromagnetic interference (EMI) and radio frequency interference (RFI). This twisting technique helps to minimize signal degradation and maintain a high-quality signal transmission.

The correct answer is opt3. Opt3 refers to the fiber connector that supports full duplex Ethernet. Full duplex Ethernet allows for simultaneous communication in both directions, enabling data to be sent and received simultaneously. This is important for high-speed and efficient data transmission in networking environments.

A straight-through cable is used when connecting a host to a switch. In this scenario, the host and the switch have different wiring configurations, so a straight-through cable is needed to ensure proper communication. This type of cable has the same pinout on both ends, allowing the transmit (TX) and receive (RX) signals to be correctly aligned between the host and the switch. Using a straight-through cable when connecting a router through the console port, one switch to another switch, or a router to another router would not work as the devices have the same wiring configuration and would require a crossover cable instead.

A crossover cable is used to make an Ethernet connection between Host A and Host B. Unlike a straight-through cable, which is used to connect a host to a switch or hub, a crossover cable is specifically designed to connect two hosts directly to each other without the need for any intermediary device. This type of cable is wired in a way that the transmit and receive signals are crossed over, allowing the two hosts to communicate effectively.

An OTDR (Optical Time Domain Reflectometer) is a device used to test and analyze the performance of fiber optic cables. It sends out a pulse of light into the fiber and measures the reflections and losses along the cable. This allows it to detect faults, such as breaks or bends in the fiber, and assess the integrity and performance of the media. A light injector, TDR (Time Domain Reflectometer), and multimeter are not specifically designed for testing fiber optic cables and may not provide accurate or comprehensive results.

Fiber optic cable is not affected by EMI or RFI because it uses light to transmit data, rather than electrical signals. This makes it immune to electromagnetic interference. Additionally, fiber optic cable is the most expensive type of LAN cabling due to the cost of the materials and the complex manufacturing process involved.

Single-mode fiber-optic cable typically uses lasers as the light source. This is because lasers emit a narrow beam of light that can travel long distances without significant loss or dispersion. Single-mode fiber-optic cable has a smaller core compared to multimode, allowing only one light path to propagate. This characteristic enables higher bandwidth and longer transmission distances. Additionally, lasers provide higher data rates and better signal quality, making them suitable for applications that require high-speed and long-distance communication.

Goodput, throughput, and bandwidth are three measures of data transfer. Goodput refers to the actual useful data transferred over a network, excluding any protocol overhead. Throughput is the rate at which data is successfully transmitted from source to destination. Bandwidth is the maximum capacity of a network to transmit data. These three measures are important in assessing the efficiency and performance of a network.