Infrastructure VI

Which of the following BEST describes the function of a network firewall?

• • Translating network addresses

• • Regulating incoming and outgoing network traffic based on predetermined security rules

• • Delivering email messages to the correct recipient

• • Ensuring all devices share internet bandwidth equally

Answer explanation

A firewall's primary function is to secure a network by regulating incoming and outgoing traffic based on predetermined security rules. It serves as a barrier between a trusted internal network and untrusted external networks Network devices such as routers or switches manage bandwidth distribution, but that's not the primary function of a firewall. The task of delivering email messages would be done using mail transfer protocols, not a firewall. Though it might sound like part of a firewall's role, network address translation (NAT) is usually performed by a router.

Kate needs to connect computers at her home to share resources and communicate with each other. She could do this through a small-scale network. How is this kind of network referred to?

• • Domain

• • LAN

• • HTTP/S

• • WAN

Answer explanation

LAN (Local Area Network) is a network that typically connects devices within a limited area like a home, making it an ideal choice for Kate. In contrast, WAN (Wide Area Network) is a network that covers a larger geographic area which is usually spread across cities, states or even countries. This wouldn't be an appropriate choice for Kate's home network. HTTP/S is a protocol used for secure communication over a network, not a type of network itself. A domain is a group of computers and devices on a network that are administered as a unit with common rules and procedures, not a small-scale network.

Which two options are primarily aimed for domestic use and aim to ease household activities?

• • Home appliances and home automation devices

• • Workstations and servers

• • Mobile phones and tablets

• • Gaming consoles and medical devices

Answer explanation

Home appliances and home automation devices exist to make life easier in a home setting. Appliances, such as washers, perform household tasks, and home automation devices help automate and control these tasks. These are not typically household items. Workstations are used for complex computational tasks and servers manage network resources, both are not designed to aid in household chores. Gaming consoles provide entertainment, while medical devices are used for health monitoring, neither of these are primarily intended to ease domestic tasks. Phones and tablets are versatile devices for communication, productivity, and entertainment but aren't specifically aimed at easing household tasks.

Mark, a freelance photographer, often works with large files and needs a reliable storage solution to back up and store his photographs. His friend John recommends him to use an external hard drive. What is the primary function of an external hard drive?

• • Displaying multimedia content

• • Printing documents

• • Storing data externally

• • Scanning images

Answer explanation

The primary function of an external hard drive is to provide additional storage capacity for a computer system. It allows users to store and access data externally, separate from the computer's internal storage. External hard drives are commonly used for backup purposes, file storage, and data transfer between computers. They offer convenience and flexibility in expanding the storage capacity of a computer system. Scanning images is the primary function of a scanner, not an external hard drive. Scanners are used to convert physical documents or images into digital format. Displaying multimedia content is not a primary function of an external hard drive. External hard drives are primarily used for storage, not for displaying multimedia content. Displaying multimedia content typically involves a display device such as a monitor or television. Printing documents is the primary function of a printer, not an external hard drive. Printers are used to produce physical copies of digital documents or images

Which of the following statements about 802.11ac is false?

• • It's backwards compatible with 802.11b/g/n

• • It offers a maximum theoretical speed over 1 Gbps

• • It is less recent than the 802.11n standard

• • It operates exclusively in the 5 GHz band

Answer explanation

802.11ac is more recent than 802.11n. 802.11ac was adopted in 2013. 802.11n was adopted in 2009. 802.11ac operates solely in the 5 GHz band. 802.11ac devices can work with older standards including 802.11b, 802.11g, and 802.11n. 802.11ac supports theoretical speeds over 1 Gbps.

Which of the following connectors is MOST commonly used to connect a computer to a router for a wired network connection?

• • RJ-45

• • USB

• • RJ-11

• • Bluetooth

Answer explanation

The RJ-45 connector is commonly used to connect a computer to a router for a wired network connection. While USB can be used for network connections with appropriate adapters, RJ-45 is the standard connector for wired Ethernet connections. Bluetooth is a wireless technology used for short-range connections between devices, not a connector for wired network connections. The RJ-11 connector is typically used for telephone lines, not for connecting computers to routers.

Which of the following interfaces was a competitor to USB but never received a lot of mainstream support, based on the IEEE 1394 standard?

• • FireWire

• • Thunderbolt

• • Bluetooth

• • HDMI

Answer explanation

FireWire, also known as IEEE 1394, was developed by Apple as a high-speed interface for data transfer and peripheral connections. It was intended to be a competitor to USB but didn't gain as much mainstream acceptance. HDMI, or High-Definition Multimedia Interface, is a digital video and audio interface. It was not a direct competitor to USB and is not based on the IEEE 1394 standard. Thunderbolt is a high-speed interface developed by Intel and Apple for data transfer and display connectivity. It is not based on the IEEE 1394 standard, and its development came later than the competition between USB and FireWire. Bluetooth is a wireless technology used for short-range connections between devices. It operates in a different space than USB and is not based on the IEEE 1394 standard.

Sarah is attending a conference and wants to share a document with her colleague sitting next to her without using any cables. She opens the settings on her laptop and enables a wireless communication feature that allows devices in close proximity to connect and exchange data. Which of the following technologies is commonly used for short-range communication between devices? (Select TWO).

• • Thunderbolt

• • Bluetooth

• • Radio Frequency

• • NFC

• • USB

Answer explanation

Bluetooth is a wireless technology commonly used for short-range communication between devices, such as connecting a smartphone to a wireless headset or transferring files between devices. NFC is another wireless technology used for short-range communication. It enables devices to establish a connection by bringing them close together, commonly used for contactless payments or transferring small amounts of data. Thunderbolt is a high-speed interface primarily used for connecting peripherals like external hard drives or monitors to a computer. It utilizes a physical cable and is not a wireless technology. RF (Radio Frequency) is a general term used to describe the use of radio waves for wireless communication. While it is a wireless technology, it is not specifically associated with short-range communication between devices. USB is not a wireless technology but rather a wired interface used for connecting peripheral devices to a computer. It involves a physical cable and is not suitable for short-range wireless communication.

Which component of a computer system performs arithmetic and logical operations?

• • CPU

• • Motherboard/system board

• • NIC

• • RAM

• • Storage device

Answer explanation

The CPU (Central Processing Unit) is one of the correct answers. It is the core component responsible for executing instructions and performing arithmetic and logical operations. RAM is used for temporary data storage and does not perform arithmetic or logical operations. Storage devices, such as hard drives and SSDs, are responsible for data storage and retrieval but do not perform arithmetic or logical operations. The NIC (Network Interface Card) is responsible for network connectivity and does not perform arithmetic or logical operations. The motherboard facilitates communication and connectivity but does not perform arithmetic or logical operations.

A network technician at Dion Training is setting up a wireless network for their office. They want to ensure a high-speed data transfer rate to support business operations. What is the maximum data transfer rate you can achieve with a network using the 802.11n standard?

• • 54 Mbps

• • 11 Mbps

• • 1 Gbps

• • 600 Mbps

Answer explanation

The 802.11n standard technically supports up to 600 Mbps, making it the correct choice. Although 1 Gbps is a possible data transfer rate for wireless networks, it's associated with the 802.11ac standard, not 802.11n. This speed represents the maximum data transfer rate for the 802.11g and 802.11a standards, not 802.11n. This is the maximum data transfer rate for the 802.11b standard, not 802.11n.