Wireless Network

Question 1

What are the disadvantages of the infrastructure mode?

Answer 1

It relies heavily on the wireless access point, and AP failure can disrupt the entire network.

Question 2

What is the role of the wireless access point in infrastructure mode?

Answer 2

It acts as the central hub, managing communication between devices and providing access to the wired network.

Question 3

Where is wireless ad hoc mode commonly used?

Answer 3

It is often used in gaming, file sharing, and temporary networks for quick device-to-device communication.

Question 4

A network engineer is deploying 5G service in a dense urban area where high-speed performance is critical. They choose a frequency band that offers gigabit-level speeds but has limited range and poor building penetration. Which band are they using, and what trade-off does it involve?

Answer 4

High Band 5G, which provides faster speeds but significantly reduced coverage area and penetration due to its short-range characteristics.

Question 5

What is an Ad Hoc Network (IBSS), and how do devices communicate in this setup?

Answer 5

Devices connect directly to each other without a central access point, enabling peer-to-peer communication and file sharing within range.

Question 6

What is an Extended Service Set (ESS) in wireless networking?

Answer 6

A configuration where multiple APs share the same SSID, allowing seamless roaming and unified connectivity across a larger area.

Question 7

What defines a Point-to-Point wireless network?

Answer 7

It connects two fixed locations over long distances using high-gain antennas, typically for static site-to-site links.

Question 8

What are the two primary configurations of Mesh Networks, and how do they differ in architecture and application?

Answer 8

Infrastructure-based Mesh (ESS Mode): Uses APs to relay data across multiple hops

Hybrid/Multi-Network Mesh: Combines satellite, microwave, radio, and Wi-Fi for resilient, multi-path networking

Question 9

What is an Autonomous Access Point, and in what scenarios is it typically used?

Answer 9

A standalone device that independently handles all wireless functions, including authentication, encryption, and traffic management. It’s ideal for small or isolated deployments where centralized control isn’t needed.

Question 10

How do omni-directional and uni-directional antennas differ in signal coverage and use case?

Answer 10

Omni-directional antennas radiate signals equally in all directions—ideal for general coverage in open areas like office floors or outdoor hotspots.

Uni-directional antennas focus energy in a single direction—best for targeting specific zones or long-distance links.

Question 11

What is a Lightweight Access Point, and how does it differ from an Autonomous AP?

Answer 11

Centrally managed by a Wireless LAN Controller (WLC). It offloads most processing tasks—like authentication and policy enforcement—to the controller, simplifying deployment and scaling. Commonly used in large enterprise networks.

Question 12

Compare the 2.4 GHz, 5 GHz, and 6 GHz bands in terms of range, speed, and interference.

Answer 12

2.4 GHz: Longest range, best wall penetration, but high interference; only 3 non-overlapping channels (1, 6, 11).

5 GHz: Faster speeds, shorter range, up to 24 non-overlapping channels; supports channel bonding for wider throughput.

6 GHz: Fastest speeds, shortest range, least congestion; ideal for dense environments (e.g., offices, apartments).

Question 13

What is channel bonding and when is it used?

Answer 13

Channel bonding merges adjacent channels into a single wider channel—used in 5 GHz and 6 GHz bands to increase throughput for high-bandwidth applications like video streaming or enterprise traffic.

Question 14

What does the 802.11h standard introduce for wireless optimization?

Answer 14

DFS (Dynamic Frequency Selection): Devices detect radar signals and avoid interference by switching channels.

TPC (Transmit Power Control): Devices adjust transmission power to maintain connection quality and reduce RF pollution. 802.11h ensures that Wi-Fi devices operating in the 5 GHz band don’t interfere with critical systems like weather radar, air traffic control, or military communications.

Question 15

What is band steering and why is it important in multi-band networks?

Answer 15

Band steering automatically shifts client devices to the optimal frequency band (e.g., from 2.4 GHz to 5/6 GHz) to balance load and improve performance—especially useful in dual/triple-band enterprise APs.

Question 16

What is the Wi-Fi standard for 802.11a? What is the frequency? What is a key feature?

Answer 16

Wi-Fi 1 | Frequency: 5 GHz | Key Feature: First to use 5 GHz, offering faster speeds but shorter range than 802.11b.

Question 17

What is the Wi-Fi standard for 802.11b? What is the frequency? What is a key feature?

Answer 17

Wi-Fi 2 | Frequency: 2.4 GHz | Key Feature: First widely adopted Wi-Fi standard, with better range but slower speeds than 802.11a.

Question 18

What is the Wi-Fi standard for 802.11g? What is the frequency? What is a key feature?

Answer 18

Wi-Fi 3 | Frequency: 2.4 GHz | Key Feature: Combined 802.11b’s range with 802.11a’s faster speeds, improving 2.4 GHz networking.

Question 19

What is the Wi-Fi standard for 802.11n? What is the frequency? What is a key feature?

Answer 19

Wi-Fi 4 | Frequency: 2.4 GHz & 5 GHz (Dual Band) | Key Feature: Introduced MIMO (Multiple Input, Multiple Output) for better speed and reliability.

Question 20

What is the Wi-Fi standard for 802.11ac? What is the frequency? What is a key feature?

Answer 20

Wi-Fi 5 | Frequency: 5 GHz | Key Feature: First to use MU-MIMO, boosting speed and efficiency for multi-device environments.

Question 21

What is the Wi-Fi standard for 802.11ax? What is the frequency? What is a key feature?

Answer 21

Wi-Fi 6 | Frequency: 2.4 GHz & 5 GHz | Key Feature: Improved speed, efficiency, and OFDMA for better multi-device performance.

Question 22

A meeting room has one access point rated for 30 clients, but 50 attendees are trying to connect at once, causing connectivity issues. What should the network administrator do to resolve the problem?

Answer 22

Install an additional access point — adding another AP distributes the client load, improves performance, and ensures reliable connectivity for all users.

Question 23

A library wants to offer public Wi-Fi that is open and easy to access, but still protects users from eavesdropping. What wireless security feature should be implemented?

Answer 23

WPA3 Wi-Fi Enhanced Open — provides encryption on open networks without requiring a passphrase.

Question 24

What is EAP in wireless networking?

Answer 24

Extensible Authentication Protocol; a framework used in WPA2/WPA3-Enterprise for forwarding authentication between the client, access point, and RADIUS server.

Question 25

What is LWAPP and what is its purpose in a wireless network?

Answer 25

LWAPP (Lightweight Access Point Protocol) allows a wireless controller to centrally manage lightweight access points, handling configuration, firmware updates, and RF settings.

Question 26

What is HT Mixed Mode in 802.11n Wi-Fi?

Answer 26

Lets old (a/b/g) + new (n) devices connect Adds overhead = slower speeds Good for compatibility, not best for performance

Question 27

Compare GCMP, CCMP, and TKIP in Wi-Fi security. When would you use each?

Answer 27

TKIP: Older, weaker encryption; backward compatibility; avoid if possible. CCMP (AES): Strong, standard for WPA2; reliable for modern networks. GCMP (AES-GCMP): Strongest, used in WPA3; adds forward secrecy.

Question 28

What term describes the orientation of electromagnetic waves emitted by a wireless antenna?

Answer 28

Polarization — It defines the direction in which the electric field of the wave oscillates—horizontal, vertical, or circular.

Question 29

A user cannot connect to a Wi-Fi network despite having the correct password. What is a common cause related to security settings?

Answer 29

Encryption protocol mismatch — the device and access point are using different Wi-Fi security protocols or encryption types, preventing successful authentication.

Question 30

If a technician is analyzing 2.4 GHz signals using OFDM, which Wi-Fi standard are they most likely working with?

Answer 30

802.11g — it operates in the 2.4 GHz band and uses OFDM (Orthogonal Frequency-Division Multiplexing) for higher-speed transmissions compared to 802.11b.