Modern Network Technologies and Architectures
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Question 5
As networks evolve to support growing demands in scalability, security, automation, and flexibility, technologies such as IPv6, Software Defined Networking (SDN), Cloud Computing, the Internet of Things (IoT), and Network Address Translation (NAT/PAT) have emerged as critical enablers of modern digital infrastructure. Understanding these technologies is essential for designing and maintaining robust and future-proof networks.
(a) Explain two key limitations of IPv4 that IPv6 addresses. Then briefly describe how IPv6 improves routing efficiency and scalability in large networks. [5 Marks]
(b) Define the architecture of SDN and explain how it differs from traditional networking. Provide one real-world benefit of SDN in managing enterprise or cloud networks. [5 Marks]
(c) Describe the three primary service models of cloud computing (IaaS, PaaS, SaaS), and explain how each supports different layers of enterprise IT infrastructure. [5 Marks]
(d) Differentiate between Network Address Translation (NAT) and Port Address Translation (PAT). Use a simple diagram or example to show how PAT enables multiple devices to share a single public IP. [5 Marks]
(20 Marks)
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Hi baxter, let's look at how modern networking technologies like IPv6, SDN, and cloud computing address the growing demands of our digital infrastructure.
Question 5: Modern Networking Technologies
In part a, we explore why we moved from IPv4 to IPv6. The most significant limitation of IPv4 is address exhaustion.
(a) IPv4 Limitations and IPv6 Improvements
IPv4 uses 32-bit addresses, providing about 4 point 3 billion addresses. In contrast, IPv6 uses 128-bit addresses, which is practically infinite.
Another limitation is routing inefficiency. IPv4 headers are complex and vary in size. IPv6 uses a simplified, fixed-length header, which reduces the processing load on routers.
Key IPv6 Benefits:
1. Address Space: Resolves exhaustion.
2. Routing Efficiency: Simplified headers and hierarchical addressing allow for smaller routing tables and faster processing.
Next, let's talk about Software Defined Networking, or SDN. It represents a major shift in how we manage network traffic.
(b) Software Defined Networking (SDN)
The core architecture of SDN is the separation of the control plane, which makes decisions, from the data plane, which forwards the traffic.
In traditional networking, these are bundled inside each individual router. SDN centralizes the control in a software controller. This provides the benefit of network programmability, allowing administrators to reconfigure the whole network instantly from one place.
Benefit: Centralized management and programmability lead to faster deployment and automation in cloud environments.
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