EXPLORING THE NETWORK

Chapter 1

Intro to Routing & Switching

OBJECTIVES

NETWORKING IN OUR LIVES Networks have changed how we

communicateEveryone can connect & share

How have networks changed the way…You learn?You communicate?You play? You work?

HOMEWORK Read slides 1.1.1.1 - 1.1.1.8

Complete Lab - Researching Network Collaboration Tools on 1.1.18

You will use the wiki to keep track of questions you get wrong on chapter tests

NETWORKS OF MANY SIZES Form 6 groups

On poster paper, draw a picture & use key words to describe:Simple small home networkSOHOMedium-large networksWorld-wide networkClient/ServerPeer-to-peer

CLIENT-SERVER NETWORK Host

Can send & receive messages

Server Host with special software Provides a service, like email or web pages

Email server/web server

Client Host with special software Requests & displays info from a server

PC with web browser to display pages from web server

CLIENT-SERVER NETWORK

PEER-TO-PEER NETWORK A computer can be a client AND a server SOHO & home use P2P networks

Simple P2P- 2 computers connected

Multiple devices with network device to connect them

PEER-TO-PEER NETWORK Advantages

Disadvantages

REVIEW

COMPONENTS OF A NETWORK

1.2.1

NETWORK ICONS

END DEVICES (HOSTS) Interface between users & the network Host is either source or destination Each host has an address to identify it

INTERMEDIARY DEVICES Connect end devices Work behind scenes to make data flow

Network Access- switches and WAPs Internetworking- routers Security- firewalls

INTERMEDIARY DEVICES Knows the path Finds detour when link fails Can prioritize data with Quality of

Service (QoS) prioritiesWhat does this mean?

Filter dataSecurity

IDENTIFYING DEVICES Complete the handout

VISUAL MAPS

ACTIVITY End device Intermediary Media

END OF DAY 2

REVIEW

LANS & WANSINTERNET &

CONNECTING TO IT

1.2.2, 1.2.3, 1.2.4

TYPES OF NETWORKSThe two most common types of network infrastructures are: Local Area Network (LAN) Wide Area Network (WAN).

Other types of networks include: Metropolitan Area Network (MAN) Wireless LAN (WLAN) Storage Area Network (SAN)

LAN Over a small area

WAN

INTERNET Connected networks Not owned by anyone

Organizations maintain it & standards

INTRANET & EXTRANET

INTERNET CONNECTIONS- SOHO In groups of 4

How you connect, bandwidth (s, m, f), device needed, special info

Cable/fiber DSL Cellular Satellite Dial-up

INTERNET CONNECTIONS- BUSINESS Dedicated leased line

Connection from ISP to you

T1 (1.5Mbps) & T3 (44Mbps)

Metro Ethernet What is it?

DSL ADSL & SDSL 18,000ft. over copper

Satellite Higher cost Slower

END OF DAY 3

REVIEW

CONVERGED NETWORKSRELIABLE NETWORKS

1.3.1, 1.3.2

NETWORKS CONVERGE

NETWORK EVOLUTION

LAB 1.3.1.3 Mapping the Internet

RELIABILITY To support all of these methods of

communication, these need to be addresses to meet user expectations:Fault Tolerance Scalability Quality of Service (QoS) Security

FAULT TOLERANCE Limits failures Quick recovery when failure occurs

One path fails, message takes different path Circuit-switched network Packet-switched network

SCALABILITY Grow, able to support more users & new

applications w/out major changes

QOS Have you ever tried to watch a video

with constant breaks and pauses? Must provide predictable, measurable,

and at times, guaranteed services Is packet-switched guaranteed?

Can be used on home routersWhat has priority? Phone, video game,

Internet?

SECURITY What can happen if bad or no security?

Network infrastructure security Information security

Ensure data is kept confidential, data integrity, data availability

ACTIVITY Complete the handout

END OF DAY 4

REVIEW

NETWORK TRENDSNETWORK SECURITY

1.4.1, 1.4.2, 1.4.3

NEW TRENDS AT COMPANIES BYOD Online collaboration Video communication Cloud computing

Access application through online subscription

Store files on network servers online Kept in data centers (WE HAVE ONE!)

How does this help an IT department & business

EXTERNAL & INTERNAL THREATS Viruses, worms, and Trojan horses Spyware and adware Zero-day attacks, also called zero-

hour attacks Hacker attacks Denial of service attacks Data interception and theft Identity theft

Make a poster for each, in groups

THREAT SOLUTIONS Antivirus Anti-spyware Firewall filtering

In a larger network:Dedicated firewall systemACLs IPS (intrusion prevention system)VPN

ACTIVITY

REVIEW & STUDY Complete the study guide handout

Take the quiz on netacad.com

Jeopardy review

SUMMARYIn this chapter, you learned: Networks and the Internet have changed the way

we communicate, learn, work, and even play.

Networks come in all sizes. They can range from simple networks consisting of two computers, to networks connecting millions of devices.

The Internet is the largest network in existence. In fact, the term Internet means a ‘network of networks. The Internet provides the services that enable us to connect and communicate with our families, friends, work, and interests.

SUMMARY 2 The network infrastructure is the platform that

supports the network. It provides the stable and reliable channel over which communication can occur. It is made up of network components including end devices, intermediate device, and network media.

Networks must be reliable.

Network security is an integral part of computer networking, regardless of whether the network is limited to a home environment with a single connection to the Internet, or as large as a corporation with thousands of users.

SUMMARY 3 The network infrastructure can vary

greatly in terms of size, number of users, and number and types of services that are supported on it. The network infrastructure must grow and adjust to support the way the network is used. The routing and switching platform is the foundation of any network infrastructure.

EXPLORING THE NETWORK

Chapter 1

Intro to Routing & Switching