Page 161 - Computer_Science_F5

Computer Science This discussion explores the importance 1. The Internet has revolutionised
Exercise 3.5
of QoS, its components, implementation
methods, and real-world applications.
communication and collaboration
(a) Importance of QoS
on a global scale. Explain how a
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QoS is essential for reliable and
layer empowers individuals and
predictable network performance. It deep understanding of the network
manages bandwidth, reduces latency, businesses to leverage the power
and mitigates packet loss, benefiting of the Internet effectively.
critical applications like voice and video 2. Explain the concept of routing
conferencing, online gaming, and real- protocols and how they help
time data analytics. QoS also ensures fair routers choose the best paths for
resource allocation, preventing congestion data to travel. How does this choice
and bottlenecks during peak usage. of routing algorithm affect the
performance and fault tolerance of
(b) Key components of QoS different network topologies (e.g.,
Bandwidth management: QoS allocates mesh, star, ring)? Provide a detailed
available bandwidth based on policies and analysis with examples.
traffic characteristics. It prioritises critical 3. Imagine you are a network
applications while providing sufficient administrator troubleshooting a
resources for less time-sensitive traffic. slow network connection. How
(i) Traffic prioritisation: Differentiated would understanding the network
Services (DiffServ) and Integrated layer’s functionalities, particularly
Services (IntServ) classify and routing, help you diagnose the
prioritize traffic based on application issue?
requirements, user profiles, or service 4. How does Quality of Service (QoS)
level agreements (SLAs). impact network performance and

(ii) Traffic shaping and policing: Traffic user experience in modern digital
shaping controls data transmission environments?
rates, smoothing traffic flows to 5. What are the key components and
prevent congestion. Traffic policing implementation methods of Quality
enforces rate limits to ensure of Service (QoS) mechanisms,
compliance with QoS policies. and how do they contribute to
(iii) Packet scheduling: Algorithms like optimising network traffic?
Weighted Fair Queuing (WFQ),
Class-Based Queuing (CBQ), and Internet Protocol (IP) addressing

Hierarchical Fair Service Curve Internet Protocol version 4 (IPv4)
(HFSC) determine the order of Each device in TCP/IP networks
packet transmission, giving priority is assigned a logical IP address for
to higher-priority traffic classes. identification. Unlike the Data-Link layer

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Computer Science Form 5.indd 152 23/07/2024 12:33