Network Types and Their Characteristics
Describe the key differences between a LAN and a WAN.
A LAN is a network within a single geographical location, typically owned and managed by an organization, whereas a WAN spans multiple geographic locations and often relies on leased infrastructure from an ISP.
Compare the functions of a network switch and a hub.
A hub broadcasts data to all connected devices, creating a single collision domain, whereas a switch intelligently forwards data only to the intended recipient using MAC addresses, reducing network congestion and increasing efficiency.
Why is shielded twisted pair (STP) sometimes preferred over unshielded twisted pair (UTP)?
STP provides additional protection against electromagnetic interference (EMI), making it more suitable for environments with high external interference, such as near power lines or industrial equipment.
How does an access point (AP) function in a wireless network?
An access point acts as a bridge between wireless clients and a wired network, enabling devices to connect to the LAN using Wi-Fi.
Explain the difference between peripheral devices and internal computer components. Provide examples of each.
Peripheral devices are external components users handle, like keyboards, mouse, microphones, cameras, monitors, and speakers. Internal components, housed inside the case, include the motherboard, CPU, memory, adapter cards, storage, and power supply.
A technician needs to upgrade the memory in a desktop computer, but notices the system case has several screws and a locking mechanism on the side panel. What should the technician do before attempting to open the case?
The technician should consult the system documentation and follow the manufacturer’s instructions for opening the case. Some cases include anti-tamper mechanisms or specific procedures for removing the side panel. Following proper steps prevents damage to the system and ensures safe access to internal components.
Explain how a MAN differs from both a LAN and a WAN.
A MAN covers an area larger than a LAN but smaller than a WAN, typically within a city or metropolitan area, connecting multiple LANs within that region.
Explain the difference between an unmanaged switch and a managed switch.
An unmanaged switch requires no configuration and simply connects devices, whereas a managed switch allows for network configuration, security settings, VLANs, and performance monitoring.
What are the primary advantages of fiber optic cabling compared to copper cabling?
Fiber optic cables offer higher bandwidth, longer transmission distances, and immunity to electromagnetic interference compared to copper cables.
What factors should be considered when deploying a WLAN in an office environment?
To ensure optimal performance and security, consider interference, access point placement, channel selection, security settings, and signal coverage.
Describe the main purpose of the system case (chassis) in a personal computer.
The system case houses and protects the internal components of the computer such as the motherboard, CPU, memory, adapter cards, storage drives, and power supply. It also helps with airflow and cooling and provides structural support for mounting hardware components.
A small office computer is overheating frequently. When inspecting the back of the computer, the technician notices that the ventilation area near the power supply is blocked by objects placed behind the system. What is the most likely cause of the problem and what should be done?
The most likely cause is restricted airflow around the power supply unit (PSU), which prevents heat from being properly exhausted. The technician should remove any obstructions around the ventilation area to allow proper airflow and ensure the PSU fan can effectively cool the system.
What is the purpose of a SOHO network, and how does it differ from an enterprise network?
A SOHO (Small Office Home Office) network is designed for small businesses, often using a single networking device (like a broadband router), whereas an enterprise network is more complex, supporting a larger number of users, multiple servers, and higher security measures.
What is Power over Ethernet (PoE), and how does it benefit network deployment?
PoE allows network cables to carry electrical power, enabling devices like VoIP phones, cameras, and wireless access points to operate without separate power adapters, simplifying installation and reducing cable clutter.
How do Cat5e, Cat6, and Cat6a cables differ in terms of performance?
Cat5e supports speeds up to 1 Gbps, Cat6 supports speeds up to 10 Gbps over shorter distances, and Cat6a enhances performance with better shielding and longer 10 Gbps range.
What are the key differences between Bluetooth, RFID, and NFC?
Bluetooth supports short-range wireless communication between devices, RFID enables object tracking using passive or active tags, and NFC allows contactless data exchange over very short distances, commonly used for payments.
What steps should be followed when opening a desktop computer case for maintenance?
When opening a desktop case, follow the system documentation and recommended steps. A tower case usually has a side panel that slides out, secured with screws or clips, sometimes with anti-tamper security. Proper procedures prevent damage.
A user reports that the power button on the computer case is not responding. However, the monitor and external devices appear to be functioning correctly. Which part of the system should the technician inspect first and why?
The technician should inspect the front panel connectors that link the power button to the motherboard. If these connectors are loose, improperly connected, or damaged, the power button may not send the signal required to start the system.
How does a datacenter network architecture differ from a traditional office network?
A datacenter is a dedicated facility designed to house servers and storage infrastructure with high availability, climate control, and power redundancy, whereas a traditional office network primarily connects user workstations, printers, and other end-user devices.
How does a patch panel contribute to network management?
A patch panel organizes and centralizes network cabling by providing easily accessible ports that connect wall outlets to network switches, making maintenance and changes more manageable.
What is plenum-rated cabling, and where is it required?
Plenum-rated cable is designed with fire-resistant materials that emit low smoke, required for installation in plenum spaces (areas used for HVAC airflow) to meet fire safety regulations.
Why might an enterprise network use multiple frequency bands for Wi-Fi?
Using both 2.4 GHz and 5 GHz bands optimizes network performance—2.4 GHz offers better range, while 5 GHz provides higher speeds and less interference.
What functions are typically provided by the front panel of a computer case?
The front panel usually provides access to removable media drives, the power on/off button, and indicator lights such as LEDs that show drive activity or system power status. In some systems, the front cover may also be removable for maintenance purposes.
While assembling a new desktop system, a student installs the motherboard directly onto the metal case without using spacers or standoffs. What potential problem could occur and why?
Installing the motherboard without standoffs may cause the board to come into direct contact with the metal case, which can create an electrical short circuit. This could damage the motherboard or other components. Standoffs are required to maintain proper spacing and prevent electrical contact with the chassis.
What role does a SAN play in a network, and why is it kept separate from client devices?
A SAN (Storage Area Network) provides a dedicated high-speed storage network for servers, offering more flexibility and reliability than using local storage. It is kept separate from client devices to ensure high performance and security for critical applications.
Why are media access control (MAC) addresses important in Ethernet networking?
MAC addresses uniquely identify devices on a network, allowing Ethernet frames to be properly directed to their intended destination within a local network segment.
What is the purpose of a network tap, and how do passive and active taps differ?
A network tap is used for monitoring network traffic. Passive taps simply copy data without affecting transmission, whereas active taps regenerate the signal but can become a failure point if power is lost.
How does a service set identifier (SSID) function in a wireless network?
An SSID is the name of a Wi-Fi network that clients use to identify and connect to an access point.
Why is proper ventilation around the power supply unit (PSU) important in a computer system?
The PSU contains an integrated fan that helps remove heat from the system. If the exhaust is obstructed, airflow is reduced, which can lead to overheating and potential damage to internal components. Ensuring proper ventilation helps maintain system stability and cooling efficiency.
A technician is installing new internal hardware but accidentally touches sensitive components without grounding themselves. What risk does this pose and how can it be prevented?
This action can cause electrostatic discharge (ESD), which may damage sensitive electronic components on the motherboard or expansion cards. To prevent this, the technician should use proper ESD precautions such as wearing an anti-static wrist strap or grounding themselves before handling internal components.