Real-Life Applications Flashcards
(5 cards)
Explain two differences between the World-Wide-Web (WWW) and a Wide-Area-Network (WAN).
Purpose: The WWW is a system of interlinked documents and multimedia accessible via the internet, while a WAN is a network that connects multiple smaller networks over large distances.
Scope: The WWW is software-based and requires the internet to function, whereas a WAN is hardware-based and includes various connections like cables, satellites, and routers.
Why are standards like ASCII, UNICODE, and HTML still needed alongside the OSI model?
A:
Purpose: The OSI model standardizes communication layers but does not define data representation or format.
ASCII/UNICODE: Standardize character encoding, ensuring text is represented consistently across devices.
HTML: Defines the structure and presentation of content on the WWW.
Explain the importance of check-sums in a packet-switching system.
Purpose: Check-sums ensure data integrity during transmission by detecting errors in packets.
Process: The sender calculates a check-sum value for the data, and the receiver recalculates it to confirm the data’s accuracy.
Outline two advantages that make optical fiber better than copper cables for outdoor use.
Higher Bandwidth: Optical fibers can carry significantly more data over long distances without loss.
Resistance to Interference: They are immune to electromagnetic interference, making them more reliable in harsh environments.
Outline one advantage and one disadvantage of using a VPN for a bank director working from home.
Advantage: Provides encrypted and secure access to the bank’s servers, protecting sensitive data.
Disadvantage: Can reduce connection speed due to encryption overhead and routing through secure servers.
