Computer Networks

Mobile Networks

100

1. Which of the following is a key feature of 2G mobile networks?

A) High-speed internet access
B) Voice calls and text messaging
C) High-definition video streaming
D) Global connectivity across all devices

B) Voice calls and text messaging

• 2G (Second Generation) networks mainly supported voice calls and text messaging, with limited data transfer.

200

 Which mobile network generation (G) introduced the ability to stream high-definition video and provide faster internet speeds compared to its predecessor?

A) 2G
B) 3G
C) 4G
D) 5G

3G

• 3G (Third Generation) networks introduced faster internet speeds, enabling features like video calling and streaming HD video.

300

TWO major differences between 2G and 3G networks:

• Data Speed: 2G networks primarily supported voice and text messaging, with limited data speeds (up to 64 kbps), while 3G networks provided much faster data speeds (up to 42 Mbps), enabling mobile internet access and video calls.

• Technology: 2G networks used digital signal processing for basic services, while 3G networks introduced packet-switched technology for faster, more efficient data transfer, enabling services like video streaming and mobile broadband.

400

ONE challenge the company may face in implementing 5G infrastructure:

High Infrastructure Costs: Building a 5G network requires upgrading and installing more advanced cell towers, equipment, and fiber-optic cables. The high cost of this infrastructure could be a challenge for telecommunications companies.

Types of Mobile networks

100

 Define the term “wide area network” ( WAN).

 A network which covers a large geographical area.

200

which network must a user access in order to surf the Internet on a tablet from a hotspot on a beach?

WLAN

300

A Local Area Network (LAN) typically covers

 A single building or small group of buildings 

400

 For EACH of the following pairs of terms, describe ONE scenario where EACH term is more useful than the other

 Local area - Small Building

Wide area- Large multinational company

Wireless Network technology

100

Which wireless technology is most commonly used for short-range data transfer between mobile devices and accessories such as headphones?

Bluetooth

200

What technology allows a user to make contactless payments by tapping a phone on a terminal?

NFC

300

Describe ONE real-world scenario where ZigBee would be preferred over Wi-Fi for wireless communication.

ZigBee is preferred in a smart home environment for controlling devices like lights, door locks, or thermostats. It is low-power, has a long battery life, and supports many connected devices without requiring high bandwidth like Wi-Fi.

Levels of network privacy

100

Define extranet

An Extranet is a controlled private network that allows authorized external users (partners, suppliers, customers) to access certain parts of an organization’s intranet.

200

 Explain ONE advantage and ONE disadvantage of using an Intranet for internal communication within the company.

Advantage:
Security and Privacy: An Intranet is a private network, ensuring that communication and information sharing are secure and only accessible by authorized personnel.

Disadvantage:
Limited Accessibility: Since the Intranet is restricted to the organization’s network, employees can only access it from within the company's premises or a secure virtual private network (VPN), which may limit flexibility

300

Explain ONE security risk associated with the company’s use of the Extranet and suggest a strategy to minimize this risk.

Risk:
Unauthorized access by external users or hackers exploiting weak authentication methods.

Strategy:
Implement strong authentication measures such as multi-factor authentication (MFA) and regularly update access permissions to ensure only authorized users have access.

400

The network that is accessible to anyone, anywhere, to browse websites, check emails, or use social media is known as:

A) Intranet
B) Extranet
C) Internet
D) Virtual Private Network (VPN)

 Internet

The Internet is a global network, accessible by anyone and commonly used for browsing websites, social media, and emailing.