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Exploring the network

Exploring the network. Chapter 1 Intro to Routing & Switching. Objectives. Networking in our lives. Networks have changed how we communicate Everyone can connect & share How have networks changed the way… You learn? You communicate? You play? You work?. homework.

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Exploring the network

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  1. Exploring the network Chapter 1 Intro to Routing & Switching

  2. Objectives

  3. Networking in our lives • Networks have changed how we communicate • Everyone can connect & share • How have networks changed the way… • You learn? • You communicate? • You play? • You work?

  4. 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

  5. Networks of many sizes • Form 6 groups • On poster paper, draw a picture & use key words to describe: • Simple small home network • SOHO • Medium-large networks • World-wide network • Client/Server • Peer-to-peer

  6. 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

  7. Client-server network

  8. 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

  9. Peer-to-peer network • Advantages • Disadvantages

  10. Review

  11. 1.2.1 Components of a network

  12. Network icons

  13. End devices (hosts) • Interface between users & the network • Host is either source or destination • Each host has an address to identify it

  14. Intermediary devices • Connect end devices • Work behind scenes to make data flow • Network Access- switches and WAPs • Internetworking- routers • Security- firewalls

  15. Intermediary devices • Knows the path • Finds detour when link fails • Can prioritize data with Quality of Service (QoS) priorities • What does this mean? • Filter data • Security

  16. Identifying devices • Complete the handout

  17. Visual maps

  18. activity • End device • Intermediary • Media

  19. review END OF DAY 2

  20. 1.2.2, 1.2.3, 1.2.4 LANS & WANSINTERNET & CONNECTING TO IT

  21. TYPES OF NETWORKS The 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)

  22. LAN • Over a small area

  23. WAN

  24. INTERNET • Connected networks • Not owned by anyone • Organizations maintain it & standards

  25. Intranet & extranet

  26. 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

  27. 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

  28. REVIEW END OF DAY 3

  29. 1.3.1, 1.3.2 CONVERGED NETWORKSRELIABLE NETWORKS

  30. Networks converge

  31. Network evolution

  32. Lab 1.3.1.3 • Mapping the Internet

  33. 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

  34. Fault tolerance • Limits failures • Quick recovery when failure occurs • One path fails, message takes different path • Circuit-switched network • Packet-switched network

  35. scalability • Grow, able to support more users & new applications w/out major changes

  36. 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 routers • What has priority? Phone, video game, Internet?

  37. Security • What can happen if bad or no security? • Network infrastructure security • Information security • Ensure data is kept confidential, data integrity, data availability

  38. Activity • Complete the handout

  39. review END OF DAY 4

  40. 1.4.1, 1.4.2, 1.4.3 Network trendsnetwork security

  41. 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

  42. 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

  43. Threat solutions • Antivirus • Anti-spyware • Firewall filtering • In a larger network: • Dedicated firewall system • ACLs • IPS (intrusion prevention system) • VPN

  44. activity

  45. Review & study • Complete the study guide handout • Take the quiz on netacad.com • Jeopardy review

  46. summary In 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.

  47. 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.

  48. 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.

  49. Exploring the network Chapter 1 Intro to Routing & Switching

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