Introduction to Computer Networks Lecture 1-2

Basic Terms

• Key terminology introduced in the lecture covers fundamental concepts necessary for understanding network architecture and applications.

Composition of the Internet

• The Internet is primarily composed of a vast array of interconnected networks and devices, enabling global communication.

Network Applications

• Examples of network applications include web browsing, email services, and online gaming, highlighting the diverse functionalities supported by the Internet.

Components of End-to-End Delay

• End-to-end delay encompasses various components such as transmission delay, propagation delay, queuing delay, and processing delay.

Focus on Internet Architecture

• The lecture emphasizes understanding the design principles, functionalities, and protocols that make up the Internet architecture.

Logical and Physical Architectures

• Logical architecture describes the protocols and data flows in the Internet, while physical architecture refers to the actual hardware and infrastructure utilized.

Examples of End Systems or Hosts

• Examples of end systems, or hosts, include personal computers, smartphones, and servers, representing devices that communicate over the Internet.

Components of End-to-End Delay

• Main components of end-to-end delay include:
  • Transmission Delay: Time taken to push all bits of a packet into the wire.
  • Propagation Delay: Time for a signal to travel from the sender to the receiver.
  • Queuing Delay: Time waiting in a queue before being transmitted.
  • Processing Delay: Time taken to process the packet header and forward it.

Focus on Network Core

• The primary focus regarding the network core highlights the infrastructure and protocols critical for routing data efficiently across the networks.

'Nuts and Bolts' View of the Internet

• The 'nuts and bolts' view of the Internet entails a detailed examination of the fundamental hardware and software components that enable Internet functionality and connectivity.