Free Wireless Networking practice questions
10 free 220-1201 questions on Wireless Networking, each with a full explanation — no account needed. This section sits in the Networking part of the exam. Answer every question to see your score, then read the lessons below for anything you missed.
An IT administrator is troubleshooting poor throughput on a wireless network deployed in a busy office building. The access points are configured for 802.11g to maintain compatibility with several legacy barcode scanners. Employees report that even newer laptops experience slow performance whenever the scanners are active. Which factor BEST explains why overall network performance is reduced in this scenario?
When 802.11b devices connect to an 802.11g network, the access point must enable protection mechanisms so the older devices can interpret channel usage. These extra control frames and reduced efficiency consume airtime, lowering throughput for all connected clients, including newer devices.
A network engineer is designing wireless coverage for a high-density lecture hall where hundreds of students connect simultaneously using tablets and laptops. The goal is to improve efficiency for many small, frequent data transmissions rather than maximizing peak speed for a single client. Which 802.11 technology MOST directly addresses this requirement?
OFDMA improves efficiency in dense environments by allowing multiple clients to transmit small amounts of data simultaneously within the same channel. This reduces contention and wait times compared to giving each client exclusive access to the channel.
A wireless consultant is evaluating whether to enable 40MHz channel bonding on a 2.4GHz 802.11n network deployed in an apartment complex. Which outcome is MOST likely if this configuration is enabled?
The 2.4GHz band has only three non-overlapping 20MHz channels. Bonding two channels into 40MHz consumes most of the available spectrum, increasing interference and reducing efficiency, especially in dense environments like apartment complexes.
A gaming laptop supporting Wi-Fi 7 connects to an access point using Multi-Link Operation. During a video conference, interference suddenly affects the 6GHz band. Which benefit of MLO MOST directly helps maintain call quality?
Multi-Link Operation allows a device to maintain simultaneous connections across multiple bands. If interference affects one band, traffic can immediately shift to another active link, reducing latency and preventing disruptions during real-time applications.
A hospital is deploying RFID to track high-value infusion pumps across multiple floors. The facilities team needs the tags to provide real-time location visibility with minimal reliance on staff scanning, and they also want the option to include environmental sensors in the future. Which RFID tag type BEST fits these requirements?
Active tags include their own battery, allowing them to transmit signals independently and achieve much greater read ranges. They can also support features like initiating communication for real-time tracking and, in some models, adding sensors that report environmental conditions along with identification data.
A retailer is rolling out RFID to speed up receiving and inventory counts. The requirement is to read many tagged items simultaneously in a warehouse environment, without line-of-sight. Which RFID frequency band is MOST appropriate for this use case?
Ultra-high frequency RFID is described as offering longer read ranges and faster data transfer rates, making it ideal for supply chain and inventory management where many tags may be read in bulk without line-of-sight.
A company is replacing legacy door badges after a security review found that attackers could copy a badge identifier onto a counterfeit credential and gain entry. The organization wants a control that makes captured tag data useless without shared secrets and also requires both the badge and reader to prove identity. Which combination BEST addresses these findings?
Encryption protects data exchanged between tags and readers, preventing useful interception and reducing the value of copied identifiers without keys. Mutual authentication requires both sides to verify identity before exchanging sensitive information, which helps prevent acceptance of cloned or unauthorized credentials.
An IT team wants employees to use smartphones to interact with an existing set of RFID tags used for tap-style access and short-range credential checks. The tags operate at 13.56 MHz. However, the same smartphones are unable to read the company’s UHF inventory tags. Which explanation BEST fits these observations?
NFC is described as a specialized subset of RFID that operates at 13.56 MHz and can read many high-frequency RFID tags. It also notes that NFC cannot read low-frequency or ultra-high-frequency RFID tags, which require dedicated readers.
A pet shelter is standardizing on implantable RFID microchips for lifetime identification of animals. The chips must function without a battery, work reliably near body tissue, and only need to be readable at very short distances during intake checks. Which RFID frequency band BEST matches this deployment?
Low frequency RFID provides short read ranges and is described as penetrating water and body tissue well, making it ideal for animal identification and implantable chips that must remain functional without a battery.
A network engineer increases channel width on a 5GHz SSID to maximize throughput for large file transfers. Shortly afterward, users report more frequent contention with neighboring networks despite fewer devices on the local SSID. Which trade-off BEST explains the new issue?
On 5GHz, channels can be 20MHz, 40MHz, 80MHz, or 160MHz wide. Increasing channel width can boost throughput, but it also consumes more spectrum, reducing the number of non-overlapping channels and increasing the likelihood of interference or contention with nearby networks.
Study this section
Every lesson that covers Wireless Networking on the 220-1201 exam.