Computer Networking Trivia Exam: Quiz

Fiber optic cable is the fastest communication media because it uses light signals to transmit data. Unlike other communication media such as twisted pair cable, co-axial cable, and microwave, fiber optic cable can transmit data at extremely high speeds and over long distances without any loss of signal quality. The use of light signals allows for faster data transmission rates, making fiber optic cable the preferred choice for high-speed internet connections, long-distance telecommunications, and other applications that require fast and reliable communication.

FTP stands for File Transfer Protocol, which is a standard network protocol used to transfer files between computers on a network. It allows users to upload and download files from a remote server, making it an efficient and reliable method for file sharing. FTP is widely used in various industries, such as web development, data backup, and file distribution. It provides a secure and efficient way to transfer files over a network, making it the correct answer in this context.

A modem is used to connect to the internet using a telephone line. It is a device that converts digital signals from a computer into analog signals that can be transmitted over telephone lines. The modem then receives analog signals from the telephone line and converts them back into digital signals that the computer can understand. This allows the computer to communicate with the internet service provider (ISP) and access the internet. Switches, routers, and hubs are networking devices used to connect multiple devices in a local network, but they do not directly connect to the internet using a telephone line.

A modem is used for both modulation and demodulation. Modulation is the process of converting digital signals into analog signals for transmission over a communication channel, while demodulation is the process of converting the received analog signals back into digital signals. A modem performs both of these functions, allowing digital data to be transmitted over analog communication networks such as telephone lines. Protocols, gateways, and multiplexers are not specifically used for modulation and demodulation.

A network device that has multiple ports to connect multiple computers is called a switch/hub. Switches and hubs are both used to connect multiple devices in a network, allowing them to communicate with each other. They provide multiple ports to connect multiple computers or devices, enabling data transmission between them. Switches are more advanced than hubs as they can intelligently direct data packets to the specific device they are intended for, while hubs simply broadcast the data to all connected devices. However, both switches and hubs serve the purpose of connecting multiple computers in a network.

A protocol is a set of rules that governs the communication between network computers. It defines the format and order of messages exchanged between devices, as well as the actions to be taken in different scenarios. Without protocols, devices would not be able to understand each other or communicate effectively. Therefore, protocols are essential for enabling successful communication and coordination among network computers.

SMTP (Simple Mail Transfer Protocol) is the correct answer because it is the TCP/IP protocol specifically designed for transferring electronic mail messages from one machine to another. FTP (File Transfer Protocol) is used for file transfer, SNMP (Simple Network Management Protocol) is used for network management, and RPC (Remote Procedure Call) is a protocol used for communication between a client and server. Therefore, SMTP is the most appropriate protocol for email transfer.

Optical Fiber is the correct answer because it is a transmission media that uses light pulses to transmit data. It is made of thin strands of glass or plastic that can carry large amounts of data over long distances at high speeds. The light pulses are sent through the fiber and bounce off the walls of the fiber, allowing the data to be transmitted. Optical fiber is commonly used in telecommunications and computer networks due to its high bandwidth, low loss, and immunity to electromagnetic interference.

The default subnet mask for a class C network is 255.255.255.0. This subnet mask allows for 254 usable host addresses within the network, as the first and last addresses are reserved for network and broadcast addresses respectively. This subnet mask is commonly used for small to medium-sized networks.

An intranet refers to internet-like networks within an enterprise. It is a private network that uses internet protocols, technologies, and infrastructure to securely share information, resources, and services within an organization. Unlike the internet, which is accessible to the public, an intranet is restricted to authorized users within the organization. It allows employees to access company information, collaborate on projects, and communicate with each other. Intranets are commonly used to improve internal communication, streamline business processes, and enhance productivity within an organization.

In full-duplex data transmission, both the sender and the receiver can receive and send data simultaneously. This means that they can both transmit and receive data at the same time, allowing for two-way communication without the need to take turns.

In a star network topology, all data/information pass through a central device called a hub or switch. This central device acts as a central point of communication and manages the flow of data between all the connected devices. Each device in the network is connected to the central device individually, forming a star-like structure. This allows for efficient communication and easy troubleshooting, as any issues with one device do not affect the rest of the network.

All of the given options are disadvantages of wireless LAN. Slower data transmission refers to the fact that wireless networks generally have slower speeds compared to wired networks. Higher error rate implies that wireless connections are more prone to errors and data loss. Interference of transmissions from different computers suggests that wireless signals can be disrupted by other devices or networks operating in the same frequency range. Therefore, all of these factors are considered as disadvantages of wireless LAN.

The RJ-45 connector is commonly used with twisted pair cables. Twisted pair cables are a type of copper cable that consists of pairs of insulated wires twisted together. The RJ-45 connector is specifically designed to connect these twisted pair cables to devices such as computers, routers, and switches. It provides a secure and reliable connection for transmitting data over short to medium distances. Co-axial cables and fiber optic cables, on the other hand, require different types of connectors for proper connection. Therefore, the correct answer is Twisted Pair Cable.

The most commonly used network topology is the star topology. In a star network, all devices are connected to a central hub or switch, forming a star-like structure. This topology offers several advantages, such as easy troubleshooting and scalability, as adding or removing devices does not disrupt the entire network. Additionally, it provides better performance and reliability since each device has its own dedicated connection to the central hub.

When you ping the loopback address, a packet is sent down through the layers of the IP architecture and then up the layers again. This means that the packet is processed by each layer of the IP protocol stack, starting from the application layer and passing through the transport, network, and link layers. This allows the packet to be looped back within the same device, simulating communication with another device on the network.

A gateway is used to connect two systems, especially if the systems use different protocols. It acts as a translator, converting the data from one protocol to another so that the systems can communicate effectively. Unlike a hub or a bridge, which simply pass on data packets, a gateway actively participates in the communication process by understanding and translating the protocols being used. A repeater, on the other hand, is used to amplify or regenerate signals to extend the reach of a network.

ICMP (Internet Control Message Protocol) is a protocol that handles error and control messages. It is used by network devices, such as routers, to send error messages indicating issues with the delivery of IP packets. ICMP messages include error messages like "destination unreachable" or "time exceeded," which help in troubleshooting network connectivity problems. ICMP is also used for other network management functions such as ping, which is used to check the reachability of a host on an IP network.

A bridge is a device that connects two LANs together, allowing data to be transmitted from one LAN to another. It operates at the data link layer of the OSI model and uses MAC addresses to forward data packets between the LANs. Unlike a router, which operates at the network layer and can connect different types of networks, a bridge is specifically designed to connect LANs. A repeater amplifies and regenerates signals to extend the reach of a network, while a modem is used to connect a LAN to the internet. Therefore, the correct answer for this question is a bridge.

The correct answer is 9600 because it is one of the most commonly used transmission speeds in BPS (bits per second) for data communication. This speed allows for faster data transfer compared to the other options listed (300, 1200, 2400), making it a popular choice in various communication systems and devices.