Basic network

1. What Is Computer Networking?
A computer network
consists of:
Two or more devices
connected by media
Apps to support sharing
Media
1-2

2. Building Blocks of Networks
Devices
Applications
Networks
Computers Servers Printers Disk drives
File transfers E-mail Imaging
and
LANs WANs
Cables Routers Switches
TCP/IP
1-4

3. End-User Devices
Mobility is important.
Network connections are
essential.
OS must be designed for
networking.
Resources
1-5

4. Network Resources
Printer Servers NAS storage
1-7

5. Switches and Access Points
Access switches connect
end-users.
Core switches connect
switches and shared
resources.
APs connect wireless
devices.
Wireless AP
Switch
1-9

6. Routers
Routers connect one
network to others.
Routers control
communications.
Wireless router
Router
1-11

7. Media
Different types of signals
are transmitted over
different media.
Electricity is
transmitted
over copper
Radio frequencies
are transmitted
through air
Light is transmitted
over optical fiber
1-8

8. Network Types
PAN LAN CAN
MAN WAN
1-15

9. Network Topologies
A topology is the physical
layout of the connection.
7-17

10. The TCP/IP Networking Model
Layer Name Function Examples
Application Define applications protocol functions FTP, SSH, DNS
Transport Manage communication sessions TCP, UDP
Internet IP addressing, routing IPv4, RIP, IPv6
Network interface Physical transmission Ethernet, Wi-Fi
1-6

11. Peer-To-Peer Protocols: Actual Flow
From Patrick To Margaret
Application
Transport
Internet
Network interface
Application
Transport
Internet
Network interface
Data
AH
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IH
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1-8

12. Peer-To-Peer Protocols: Effective Flow
Application
Transport
Internet
Network interface
Application
Transport
Internet
Network interface
1-8

13. Internet Access Technologies
Dial-up modem
DSL
Cable modem
WiMax
Cellular data
Wi-Fi hot spot
Satellite
Internet
Mobile user Branch site
12-30