Network Fundamentals and Characteristics

Introduction to Networks

• Overview of network systems and their importance in modern technology.

Key Concepts in Networking

• Function: Networks allow interconnected computers to communicate, share resources, and access data.

• Components of a Network:

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Types of Networks

• Local Area Network (LAN): Limited to a room or building, connecting clients and servers.

• Backbone Network (BN): High-speed connections between LANs with a few kilometers of reach.

• Metropolitan Area Network (MAN): Connects multiple LANs across larger geographical areas.

• Wide Area Network (WAN): Similar to MAN but spans vastly greater distances.

Data Transmission Rates

• Fundamentals: Measure of how many bits per second a network can transmit.

• Typical Rates:

  • Home to ISP: 1 Mbps (upload), 10-20 Mbps (download)

  • WLAN: 50-500 Mbps

  • LAN: 1 Gbps

  • Backbone Networks: 10 Gbps

  • Optical Fiber Networks: Up to several Tbps.

Practical Example of Upload Times

• Scenario: Sending a 4K movie (50 GByte) using different connection types:

  • ADSL (1 Mbps): Approx. 4 days, 15 hours.

  • NBN (50 Mbps): Approx. 2 hours, 13 minutes.

  • Monash Network (1 Gbps): About 6 minutes, 40 seconds.

Summary of Network Characteristics

• Networks consist of these essential components: clients, servers, switches, routers, and circuit hardware (e.g., cables).

• The Internet itself is considered a "network of networks”, connecting many networks and devices based on a common, standard set of protocols

• A crucial measurement in networking is the overall data transmission rate, determining the efficiency and speed of data flow within and between networks.