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Chapter 1: Exploring the Network

Chapter 1: Exploring the Network. Introduction to Networks. 1.1 Globally Connected. Networking Today Networks in Our Past and Daily Lives. Networking Today The Global Community. Providing Resources in a Network Networks of Many Sizes. Providing Resources in a Network Clients and Servers.

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Chapter 1: Exploring the Network

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  1. Chapter 1:Exploring the Network Introduction to Networks

  2. 1.1 Globally Connected

  3. Networking TodayNetworks in Our Past and Daily Lives

  4. Networking TodayThe Global Community

  5. Providing Resources in a NetworkNetworks of Many Sizes

  6. Providing Resources in a NetworkClients and Servers

  7. Providing Resources in a NetworkPeer-to-Peer

  8. 1.2 LANs, WANs, and the Internet

  9. LANs, WANs, and InternetsComponents of a Network There are three categories of network components: • Devices • Media • Services

  10. Components of a NetworkEnd Devices Some examples of end devices are: • Computers (work stations, laptops, file servers, web servers) • Network printers • VoIP phones • TelePresence endpoint • Security cameras • Mobile handheld devices (such as smart phones, tablets, PDAs, and wireless debit / credit card readers and barcode scanners)

  11. Components of a NetworkNetwork Infrastructure Devices Examples of intermediary network devices are: • Network Access Devices (switches, and wireless access points) • Internetworking Devices (routers) • Security Devices (firewalls)

  12. Components of a NetworkNetwork Media

  13. Components of a NetworkNetwork Representations

  14. Components of a NetworkTopology Diagrams

  15. LANs and WANsTypes 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)

  16. LANs and WANsLocal Area Networks (LAN)

  17. LANs and WANsWide Area Networks (WAN)

  18. LANs, WANs, and the InternetThe Internet

  19. LANs, WANs, and the InternetIntranet and Extranet

  20. Connecting to the InternetConnecting Remote Users to the Internet

  21. Connecting to the InternetConnecting Businesses to the Internet

  22. 1.3 The Network as a Platform

  23. Converged NetworksThe Converging Network

  24. Reliable NetworkSupporting Network Architecture As networks evolve, we are discovering that there are four basic characteristics that the underlying architectures need to address in order to meet user expectations: • Fault Tolerance • Scalability • Quality of Service (QoS) • Security

  25. Reliable NetworkFault Tolerance in Circuit Switched Network

  26. Reliable NetworkPacket-Switched Networks

  27. Reliable NetworkScalable Networks

  28. Reliable NetworkProviding QoS Examples of priority decisions for an organization might include: • Time-sensitive communication - increase priority for services like telephony or video distribution. • Non time-sensitive communication - decrease priority for web page retrieval or email. • High importance to organization - increase priority for production control or business transaction data. • Undesirable communication - decrease priority or block unwanted activity, like peer-to-peer file sharing or live entertainment.

  29. Reliable NetworkProviding Network Security

  30. 1.4 The Changing Network Environment

  31. Network TrendsNew trends Some of the top trends include: • Bring Your Own Device (BYOD) • Online collaboration • Video • Cloud computing

  32. Network TrendsBring Your Own Device (BYOD) The concept of any device, to any content, in anyway is a major global trend that requires significant changes to the way devices are used. This trend is known as Bring Your Own Device (BYOD).

  33. Network TrendsOnline Collaboration

  34. Network TrendsVideo Communication

  35. Network TrendsCloud Computing Cloud computing offers the following potential benefits: • Organizational flexibility • Agility and rapid deployment • Reduced cost of infrastructure • Refocus of IT resources • Creation of new business models

  36. Network TrendsData Centers A data center is a facility used to house computer systems and associated components including: • Redundant data communications connections • High-speed virtual servers (sometimes referred to as server farms or server clusters) • Redundant storage systems (typically uses SAN technology) • Redundant or backup power supplies • Environmental controls (e.g., air conditioning, fire suppression) • Security devices

  37. Networking Technologies for the HomeTechnology Trends in the Home

  38. Networking Technologies for the HomePowerline Networking

  39. Networking Technologies for the HomeWireless Broadband

  40. Future of NetworkingNetwork Security

  41. Network SecuritySecurity Threats The most common external threats to networks include: • Viruses, worms, and Trojan horses • Spyware and adware • Zero-day attacks, also called zero-hour attacks • Hacker attacks • Denial of service (DoS) attacks • Data interception and theft • Identity theft

  42. Network SecuritySecurity Solutions Network security components often include: • Antivirus and antispyware • Firewall filtering • Dedicated firewall systems • Access control lists (ACL) • Intrusion prevention systems (IPS) • Virtual Private Networks (VPNs)

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