Networking Fundamentals

Some principles

Jon Carhart

What we will do(ish) ….

• OSI – – Physical– Data Link– Network

• Subnets• Subnet Masks• Network Configuration• Encapsulation• Ports and Server• More for next time

By Yngvar [Public domain], via Wikimedia Commons

"ARPANET first router 2" by Steve Jurvetson from Menlo Park, USA - derived from File:ARPANET first router.jpg (mildened persective, levels, rebuilt low-right corner). Licenced under Creative Commons Attribution 2.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:ARPANET_first_router_2.jpg#mediaviewer/File:ARPANET_first_router_2.jpg

OSI

Physical Medium WiFi\UTP

Data Link Local Net Ethernet

Network Routing IP

Wire

Switch

Router

S w it c h

MAC: A1

MAC: A8

S w it c h

MAC: A1

MAC: A7

S w it c h

Router A Router B

OSI

Physical Medium WiFi\UTP

Data Link Local Net Ethernet

Network Routable IP

Wire

Switch

Router

SUBNETS

192.168.2.X

192.168.2 .7

Network Host

Subnet Masks

255.255.255.0

255.255.255 .0

Network Host

Network Configuration

My IP =

My Subnet Mask =

My MAC Address =

192.168.2.7

255.255.255.0

192.168.2.1My Default Gateway =

00:X4:A7

Server001

Ports and Servers

WebServer

:80

192.168.4.5

:386

LDAP Server

Commands

• netstat –abn• ipconfig /all• telnet 127.0.0.1 80

Next time ….

• Encapsulation• Address classes• DNS – Domain Naming Services• IPv6• OSI– Transport– Session– Presentation– Application