Why does Wi-Fi slow down when many devices connect to the same access point?

All devices share the same radio frequency channel — more devices means less airtime for each, reducing throughput for everyone More devices mean more interference with the router's cooling system The router has to update its operating system for each new device connection Network cables degrade faster when many devices are connected

What is the difference between the 2.4 GHz and 5 GHz Wi-Fi bands?

2.4 GHz has longer range and penetrates walls better but is slower and more crowded; 5 GHz is faster but has shorter range 2.4 GHz is newer; 5 GHz is the older standard being phased out 2.4 GHz is for 2.4-inch screens; 5 GHz is for 5-inch and larger screens 5 GHz is used only by business networks; 2.4 GHz is only for home use

What is the OSI model and why is it useful?

A 7-layer conceptual framework that divides network communication into separate functions — making it easier to design, troubleshoot, and standardize networking A 7-step process for setting up a new network from scratch A security standard that all networks must follow by law The 7 companies that built the original internet infrastructure

What is DHCP and why is it useful?

Dynamic Host Configuration Protocol — automatically assigns IP addresses to devices when they join a network, so users don't have to configure IP settings manually Digital High-speed Communication Protocol — the standard for fast internet connections A protocol for detecting and removing malware from network devices A method of encrypting data as it moves between devices on a network

What happens when two devices on the same network have the same IP address (an IP conflict)?

Both devices experience network issues — their traffic gets misdirected, causing connection failures and unpredictable behavior The network automatically assigns one device a new IP address Both devices get double the normal network speed by sharing resources The router shuts down completely to prevent data corruption

What is network troubleshooting and what are the basic steps?

A systematic process of identifying and fixing network problems — starting with physical connections, then IP configuration, then connectivity to local and remote hosts Restarting all network devices until the problem goes away Calling your ISP immediately whenever anything goes wrong Reinstalling the operating system to clear any network corruption

What does 'ping' test and what does the response tell you?

Ping sends a test packet to an address and measures how long it takes to get a reply — confirming connectivity and measuring round-trip latency Ping shows you all the websites currently loading in your browser Ping tests your internet speed in megabits per second Ping is a notification that someone is trying to connect to your computer

What is a subnet and why are networks divided into subnets?

A subnet is a smaller, logically separated portion of a network — used to organize devices, improve security, and reduce broadcast traffic A subnet is a backup network that activates if the main network fails A subnet is a slower, secondary internet connection used as a fallback A subnet is the section of a server dedicated to running sub-programs

What is the purpose of network ports (like port 80, 443, or 22)?

Ports are logical channels that allow a computer to run multiple network services simultaneously — each service listens on a specific port number Ports are the physical sockets on a computer where cables plug in Ports are the maximum number of connections a server can handle Ports are priority levels that determine which data gets sent first

What is QoS (Quality of Service) in networking?

A feature that prioritizes certain types of traffic (like voice calls or video) over others (like file downloads) to ensure critical applications get the bandwidth they need A service level guarantee from your ISP about minimum internet speed A certification that network equipment meets quality standards A feature that automatically upgrades your internet connection when needed