The document serves as a resource for understanding computer networks, authored by Andrew S. Tanenbaum and David J. Wetherall. It covers the basic components of network infrastructure, including end devices, intermediary devices, and media, as well as the importance of signal encoding and network topologies. Key terms such as network interface cards and physical ports are also defined to assist in grasping network connectivity and communication processes.

1. COMPUTER NETWORKS
EE3318
INTRODUCTION

2. BOOK RESOURCE
Please refer this book for the module
• Author : ANDREW S. TANENBAUM and DAVID J. WETHERALL
• Title : COMPUTER NETWORKS
• Publisher : PRENTICE HALL

3. INTRODUCTION TO COMPUTER NETWORKS
• Connecting devices
• Connecting people

6. CONNECTED
• Each new development has improved and enhanced our ability to
connect and communicate with others.
• In today’s world, with networking we are connected like never
before.
• Peoples ideas shared, Discoveries known, News shared, and even
can connect with friends world wide to play games

7. TECHNOLOGY
EXPANSION

8. COMPONENTS OF NETWORK
The network infrastructure contains three categories of network
components:
• Devices
• Media
• Services

9. END DEVICES
• These devices are either the source or destination of a message
transmitted over the network.
• In order to distinguish end device from another, each end device
on a network is identified by an address. When a device initiates
communication, it uses the address of the destination device to
specify where the message should be sent

10. INTERMEDIARY DEVICES
• Intermediary devices interconnect end devices.
• These devices perform following functions:
• Regenerate and retransmit data signals
• Maintain information about what pathways exist
through the network and internetwork
• Notify other devices of errors and communication
failures
• Direct data along alternate pathways when there is a
link failure
• Classify and direct messages according to Quality of
Service (QoS) priorities
• Permit or deny the flow of data, based on security
settings

11. MEDIA
• The medium provides
the channel over which
the message travels
from source to
destination.

12. SIGNAL ENCODING
• On metallic wires, the data is encoded into electrical impulses that
match message signal.
• Fiber optic transmissions rely on pulses of light that match message
signal, within either infrared or visible light ranges.
• In wireless transmission, patterns of electromagnetic waves that
match message signal.

13. CHOOSING A MEDIA
• The network media
can be choose
according to these
criteria

14. SERVICES

15. NETWORK REPRESENTATIONS

16. IMPORTANT TERMS TO REMEMBER ARE:
• Network Interface Card - A NIC, or LAN adapter, provides the
physical connection to the network at the PC or other host device.
The media connecting the PC to the networking device plugs
directly into the NIC.

17. • Physical Port - A connector or outlet
on a networking device where the
media is connected to a host or
other networking device.
• Interface - Specialized ports on an
internetworking device that connect
to individual networks.

18. TOPOLOGY DIAGRAMS
• It provides a visual map of how the network is connected. There
are two types of topology diagrams
• Logical topology
• Physical topology

19. PHYSICAL TOPOLOGY DIAGRAMS -
• Identify the physical location
of intermediary devices,
configured ports, and cable
installation

20. LOGICAL TOPOLOGY DIAGRAMS
• Identify devices,
ports, and IP
addressing scheme

23. REFERENCES
• CCNA Routing and Switching: Introduction to Networks