CCNA 1 v6.0 Study Material – Chapter 1: Explore the Network

Chapter 1: Explore the Network

1.1 Globally Connected

  • Explain how networks affect the way we interact, learn, work, and play.
  • Explain how host devices can be used as clients, servers, or both.

1.2 LANs, WANs, and the Internet

  • Explain the use of network devices.
  • Compare the devices and topologies of a LAN to the devices and topologies of a WAN.
  • Describe the basic structure of the Internet.
  • Explain how LANs and WANs interconnect to the Internet.

1.3 The Network as a Platform

  • Explain the concept of a converged network.
  • Describe the four basic requirements of a reliable network.

1.4 The Changing Network Environment

  • Explain how trends such as BYOD, online collaboration, video, and cloud computing are changing the way we interact.
  • Explain how networking technologies are changing the home environment.
  • Identify basic security threats and solutions for both small and large networks.
  • Describe the importance of understanding the underlying switching and routing infrastructure of a network.

1.1 Globally Connected

Networking Today

  • Network has no boundary and supports the way we:
    • Learn
    • Communicate
    • Work
    • Play

Providing Resources in a Network

  • Networks of Many Sizes
    • Small Home / Office Networks
    • Medium to Large Networks
    • World Wide Network
  • Clients and Servers
    • Clients request and display information
    • Servers provide information to other devices on the network
  • Peer-to-Peer
    • Computers can be both server and client at the same time.
    • What are the advantages?
    • What are the disadvantages?

1.2 LANs, WANs, and the Internet

Network Components

  • End Devices
    • Either the source or destination of a message
    • Name some end devices
  • Intermediary Network Devices
    • Connect multiple individual networks to form an internetwork
    • Connect the individual end devices to the network
    • Ensure data flows across the network
    • Provide connectivity
  • Network Media
    • Provide the pathway for data transmission
    • Interconnect devices
    • Name the three types of media
  • Network Representations
    • What do the symbols represent?
  • Topology Diagrams
    • Physical
    • Logical

LANs and WANs

  • Local Area Networks
    • Spans across small geographical area
    • Interconnects end devices
    • Administrated by a single organization
    • Provide high speed bandwidth to internal devices
  • WAN Area Networks
    • Interconnects LAN
    • Administrated by multiple service providers
    • Provide slower speed links between LANS
  • Can you name more network types?

The Internet, Intranets, and Extranets

  • The Internet
    • Worldwide collection of interconnected networks
    • Not owned by any individual or group
  • Intranets and Extranets

Internet Connections

  • Internet Access Technologies
    • Internet Service Provider (ISP)
    • Broadband cable
    • Broadband Digital Subscriber Line (DSL)
    • Wireless WANs
    • Mobile Services
    • Business DSL
    • Leased Lines
    • Metro Ethernet
  • Types of Internet Connections
    • Home and Small Office
    • Business

1.3 The Network as a Platform

Converged Networks

  • Traditional Separate Networks
    • Each network with its own rules and
  • The Converging Network
    • Capable of delivering data, voice, and video over the same network infrastructure

Reliable Network

  • Four Basic Characteristics of Network Architecture
    • Fault Tolerance
    • Scalability
    • Quality of Service (QoS)
    • Security

1.4 The Changing Network Environment

Network Trends

  • Top trends include:
  • Bring Your Own Device (BYOB)
  • Online Collaboration
  • Video Communications
  • Cloud Computing

Networking Technologies for the Home

  • Technology Trends in the Home
    • Smart home
  • Powerline Networking
    • Uses existing electrical wiring to connect devices
  • Wireless Broadband
    • Wireless Internet Service Provider (WISP)
    • Wireless Broadband Service using cellular technology

Network Security

  • Security 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
  • Security Solutions
    • Antivirus and antispyware
    • Firewall filtering
    • Dedicated firewall systems
    • Access control lists (ACL)
    • Intrusion prevention systems (IPS)
    • Virtual Private Networks (VPNs)

Network Architecture

  • Cisco Network Architecture
    Support technologies and applications
    Ensure connectivity across any combination of networks
  • CCNA
    A first step to a networking career

1.5 Chapter Summary


  • Explain how multiple networks are used in everyday life.
  • Describe the topologies and devices used in a small to medium-sized business network.
  • Explain the basic characteristics of a network that supports communication in a small to medium-sized business.
  • Explain trends in networking that will affect the use of networks in small to medium-sized businesses.

Section 1.1 New Terms and Commands

  • client
  • collaborative learning spaces
  • global communities
  • human network
  • network collaboration services
  • network of networks
  • peer-to-peer network
  • server

Section 1.2 New Terms and Commands

  • broadband cable
  • broadband DSL
  • business DSL
  • cable
  • cellular
  • dedicated leased line
  • dial-up telephone
  • DSL
  • end devices
  • extranet
  • hardware
  • intermediary devices
  • internetworking devices
  • Internet Service Provider (ISP)

  • Intranet
  • leased lines
  • Local Area Network (LAN)
  • logical topology diagrams
  • medium
  • Metropolitan Area Network (MAN)
  • metro Ethernet
  • network access devices
  • network interface card (NIC)
  • network media
  • physical port, interface

  • physical topology diagrams
  • satellite
  • security devices
  • service provider (SP)
  • software
  • Storage Area Network (SAN)
  • TelePresence endpoint
  • teleworkers
  • topology diagram
  • VoIP phones
  • Wide Area Network (WAN)
  • Wireless LAN (WLAN)

Section 1.3 New Terms and Commands

  • availability
  • circuit switched networks
  • content security
  • converged network
  • data confidentiality
  • data integrity
  • delay
  • Denial of Service (DoS)
  • encrypting data

  • fault tolerance
  • hierarchical layered structure
  • intelligent information network
  • network architecture
  • network bandwidth
  • network congestion
  • network infrastructure security

  • packet loss
  • packet switched networks
  • packets
  • Quality of Service (QoS)
  • queue
  • redundancy
  • routing function
  • scalability
  • user authentication

Section 1.4 New Terms and Commands

  • access control lists (ACL)
  • adware
  • Bring Your Own Deice (BYOD)
  • cloud computing
  • data centers
  • data interception and theft
  • hacker attacks
  • identity theft
  • intrusion prevention systems (IPS)

  • multiple layers of security
  • multitasking
  • online collaboration
  • person-to-person video calling
  • powerline networking
  • server clusters
  • server farms
  • smart home technology
  • spyware
  • Trojan horses

  • video conferencing
  • virtual private networks (VPNs)
  • virtualization
  • viruses
  • wireless broadband service
  • wireless internet service provider (WISP)
  • wireless local area networks (WLAN)
  • worms
  • zero-day attacks

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