CompTIA Core 1 Practice 2.3 Compare and Contrast protocols for wireless networking

Wi-Fi 5 is designed to work in which band(s)? 5 GHz 2.4 GHz Both 2.4 and 5 GHz Neither 2.4 nor 5 GHz

5 GHz Wi-Fi 5 works only in the 5 GHz band. So while it can support 2.4 GHz, it needs a dual-band adapter to work with 2.4 GHz.

Some products are known to use the combined throughput of all radios. For example, the AX6000 claims nominal rates of 1,148 Mbps on the 2.4 GHz radio and 4,804 Mbps over 5 GHz. This type is an example of what? A device for Wi-Fi 6 that can operate on both bands A Wi-Fi 5 adapter that can operate on both bands An upgraded Wi-Fi 4 set to operate on both bands A WPA 2 connection of WPA3 device

A device for Wi-Fi 6 that can operate on both bands A 2.4 GHz band allows legacy connections with WPA2-Personal security, while the 5 GHz network is for 802.11ax or Wi-Fi 6-capable devices using WPA3-SAE authentication.

Which of the following is a device that works as both tag and reader, exchanges information with other like devices, and is mainly used for payment readers and security tags, although increasingly used in mobile devices for point of sale (POS) connections? An RFID tag An NFC chip A Bluetooth link A long-range fixed wireless adapter

An NFC chip A near-field communication (NFC) chip is a peer-to-peer (P2P) version of RFID, works as a tag and reader, allows users' phones as a point-of-sale (POS) terminal with a wallet app, and is progressively found built into mobile devices.

The earliest versions of this technology supported a maximum range of 10 m (30 feet). In contrast, newer versions can reach up to 100 feet, although at a significantly lower signal strength. Which of the following devices is usually portable, wearable, and must pair with other devices to work properly? An RFID tag Bluetooth An NFC tag A low-energy RFC

Bluetooth Bluetooth technology works best at the 2.4 GHz band, is portable, although some desktop systems are beginning to use it, and is usually wearable.

Unlicensed spectrum refers to the operator using a public frequency band, such as 900 MHz or which band(s)? Both 2.4 and 5 GHz 5 GHz only 20 MHz channels on 2.4 GHz 2.4 GHz only

Both 2.4 and 5 GHz An unlicensed spectrum means the operator can use a public frequency band like 900 MHz, both 2.4 GHz and 5 GHz, as long-range fixed wireless.

The network operator is trying to minimize the potential for conflicts in an unlicensed power output but knows regulatory requirements limit them. Gain measures a wireless signal's power. What is gain, and how is it measured? Gain is the sum of transmit power expressed in dBm. Gain is the transmit strength of the radio measured in dBm. Gain is the amount of boost that occurs in a focused antenna signal, measured in dBi. Gain is the wireless antenna frequency working over long-range bands, measured in dBi.

Gain is the amount of boost that occurs in a focused antenna signal, measured in dBi. Gain is the amount of boost an antenna signal receives by directionality, focusing the signal in a single direction rather than spreading it over a wide area, and is measured in decibels isotropic (dBi).

What is the difference between licensed and unlicensed when using wireless technology to configure a bridge between two networks? (Select all that apply.) Licensed means the operator purchased exclusive rights to a band in a given location. Unlicensed means the operator uses a public frequency that anyone can use. Licensed means the power output of a device gets boosted by directionality. Unlicensed means power focuses in a single direction over a wider area.

Licensed means the operator purchased exclusive rights to a band in a given location. Unlicensed means the operator uses a public frequency that anyone can use. Licensed means that the network operator purchases the exclusive right to use a frequency band within a given geographical area from the regulator. An unlicensed spectrum means the operator uses a public frequency band, such as 900 MHz, 2.4 GHz, and 5 GHz. Anyone can use these frequencies; however, interference is a risk.

A systems engineer is trying to identify suitable smartphone models to issue to field sales staff. The models must be able to use digital payments. What type of sensor must the devices have? Near-field communication system (NFC) Radio-frequency identification system (RFID) Indoor positioning system (IPS) Bluetooth

Near-field communication system (NFC) Near-field communication (NFC) allows the user to touch the phone to a point-of-sale terminal to authorize payment in conjunction with a wallet app.

Suppose a network specialist establishes a fixed long-range wireless device to configure a bridge between two networks and wants to use a specific frequency. What would be the best way for the operator to ensure signal quality? Use a public unlicensed frequency but understand that these frequencies mean interferences are a risk. Use a frequency not needing a license and minimize conflicts by ensuring the power output is strong. Install antennas to transmit signals via satellite unobstructed from single directions not needing a license. Obtain a license to purchase exclusive rights to the frequency within a geographical area from the FCC.

Obtain a license to purchase exclusive rights to the frequency within a geographical area from the FCC. Regulations state that to cover long distances, the operator must carefully configure devices with precisely aligned point-to-point line of sight, fixed wireless ground-based high-gain microwaves, and a license for exclusive rights to a frequency given by the Federal Communications Commission (FCC).

Which system works out a device's location by triangulating its proximity to other radio sources through identifying and tracking objects using special tags? Global Positioning System (GPS) Near-field communication system (NFC) Radio-frequency identification system (RFID) Indoor positioning system (IPS)

Radio-frequency identification system (RFID) Radio-frequency ID (RFID) identifies and tracks objects using specially encoded tags that can be unpowered and passive, responding when scanned at close range or from a powered, active device within 100 m.

The network supervisor plans to predominantly use the 5 GHz band for an open plan office network. However, the business owner has heard that this has a shorter range and thinks the network supervisor should use the 2.4 GHz band. Why should the 5 GHz band be preferred over the 2.4 GHz band in this case? (Select all that apply.) On a 2.4 GHz network, there is not enough space for separate networks. The chances of overlap are high on a 2.4 GHz band, increasing the risk of interference from other products. Regulations on power and dynamic frequency selection (DFS) prevent signals from interfering with other nearby installations in a 5 GHz band. Despite the open floor plan, 2.4 GHz has a shorter range than 5 GHz and would not work as well.

The chances of overlap are high on a 2.4 GHz band, increasing the risk of interference from other products. Regulations on power and dynamic frequency selection (DFS) prevent signals from interfering with other nearby installations in a 5 GHz band. On a 2.4 GHz network, there is not enough space for separate networks. In a 2.4 GHz network, each channel is only 5 MHz wide. Wi-Fi requires 20 MHz. The 5 GHz band is subdivided into 23 non-overlapping channels, each 20 MHz wide, reducing the risk of interference. In a 2.4 GHz band, there is no room for separate networks. Therefore, the chances of overlap/interference are high using the 2.4 GHz band products. There are regulatory limits on power output constraining ranges of Wi-Fi devices. The 5 GHz band must use DFS to prevent Wi-Fi signals from interfering with radar/satellite signals.

During a meeting, the network supervisor argued that they should use a 5 GHz band in their new open-plan office setting, but the owner heard that the 2.4 GHz band is the one to use since it has a shorter range. Who is right and why? (Select all that apply.) The owner is correct. The chances of interference are higher on a 5 GHz band. The owner is correct. Despite the open floor plan, a 5 GHz has a shorter range. The supervisor is correct. A 2.4 GHz network does not have enough space for separate networks. The supervisor is correct. A 5 GHz band power's regulations and DFS prevents signals from interfering.

The supervisor is correct. A 2.4 GHz network does not have enough space for separate networks. The supervisor is correct. A 5 GHz band power's regulations and DFS prevents signals from interfering. In a 2.4 GHz network, each channel is only 5 MHz wide. Wi-Fi requires 20 MHz. The 5 GHz band is subdivided into 23 non-overlapping channels, each 20 MHz wide, reducing the risk of interference. In a 2.4 GHz band, there is no room for separate networks. Therefore, the chances of overlap/interference are high using the 2.4 GHz band products.

A network administrator is assessing standards compatibility for a Wi-Fi network. Most employees have mobile devices with single-band 2.4 GHz radios. Which Wi-Fi standards work in this band? (Select all that apply.) IEEE standard 802.11a Wi-Fi 6 (802.11ax) Wi-Fi 4 (802.11n) Wi-Fi 5 (or 802.11b/g/n)

Wi-Fi 4 (802.11n) Wi-Fi 6 (802.11ax) Wi-Fi 6 works in both the 2.4 GHz and 5 GHz bands, but the 5 GHz standard is less effective at penetrating solid surfaces and does not support the maximum ranges achieved with 2.4 GHz standards. Substantial improvements have occurred with Wi-Fi 4 since 2009, and now 802.11n is officially designated as Wi-Fi 4 and works in the 2.4 GHz band.

The standards compatibility for a Wi-Fi network that will also be supporting most employees with mobile devices plans to use 802.11b/g/n to support its clients. Which GHz band is the best to use to support clients? (Select all that apply.) Wi-Fi 6 to work with the 2.4 GHz band Wi-Fi 6 working with a dual band adapter using both the 2.4 GHz and 5 GHz bands Wi-Fi 5 working with the 5 GHz band Wi-Fi 4 working with the 5 GHz band

Wi-Fi 6 working with a dual band adapter using both the 2.4 GHz and 5 GHz bands Wi-Fi 6 to work with the 2.4 GHz band Most mobile devices use the 2.4 GHz frequency. Wi-Fi 6 with access points will support 802.11b/g/n clients and is the best choice even with an 11 Mbps data rate. Although Wi-Fi 6 uses both bands, a client can only use one radio at a time, not both. This is not a feasible possibility, even with a dual-band adapter.

The network specialist sets up a long-range fixed wireless installation and operates on a public frequency without a license. Is this legal? Yes. Installations may use an unlicensed spectrum but cannot exceed the Effective Isotropic Radiated Power (EIRP) defined from regulations. Yes. However, the radio spectrum requires the operator to carefully shield the transmitters covering long distances to avoid obtaining a license. No. The point-to-point fixed wireless uses ground-based high-gain microwave antennas precisely aligned with one another, requiring a license. No. The public spectrum requires the operator using that frequency band to have a license to operate.

Yes. Installations may use an unlicensed spectrum but cannot exceed the Effective Isotropic Radiated Power (EIRP) defined from regulations. Installations may use any unlicensed public spectrum but must not exceed the band's effective isotropic radiated power (EIRP) defined by regulations.