CompTIA Network

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CompTIA Network

• Edward Gray
• MWC Information Technologies, Web Group
• A, Network, i-Net
• MCP, MCPI, MCSE

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Description

• Tests knowledge of computer networking, network
  troubleshooting, and best practices
• Targeted for candidates with 9 months of IT
  experience, network/system administration
• A highly recommended, not required

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About the test

• Single exam (N10-002)
• Administered by Prometric or VUE
• Time 90 minutes
• Questions 72 multiple choice
• Fee 199
• Score minimum 646 out of 100-900 range
• Once you pass, certified for life

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Who should take the test

• Networking professionals
• Network Administrators
• Systems Administrators
• Help Desk Technicians

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Other Certifications

• A
• CDIA
• Server
• i-Net
• Linux
• Security
• Others

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Exam Day

• Valid IDs
• Computer based
• Nothing allowed in testing room
• Will be given paper and pencil, to be returned to
  proctor at end of exam

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Objectives

• 1.1 Recognize the following logical or physical
  topologies, given a schematic diagram or
  description star/hierarchical, bus, mesh, ring,
  and wireless.
• 1.2 Specify the main features of the 802.2 (LLC),
  802.3 (Ethernet), 802.5 (Token Ring), 802.11b
  (wireless), and FDDI networking technologies,
  including the following speed, access method,
  topology, and media.

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What is a network

• Active communication between two or more
  computers
• May be located in same room or around the world
• LAN
• WAN
• Internet

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Functions of a network

• Communication
• Sharing hardware
• Data sharing
• Application sharing
• Data backup and retrieval

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Evolution of networks

• ARPA net
• Advanced Research Projects Agency
• DARPA net
• Defense ARPA
• NSF net
• National Science Foundation
• Corporate resource sharing
• Web explosion

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Evolution of the Internet
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NETWORK MODELS

• Peer-to-peer
• Client/Server

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Peer-to-Peer
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Peer-to-Peer

• Decentralized
• Cheaper and easier to implement
• Each workstation controls access to its local
  resources
• Does not scale well
• Typical for small office/home network

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Peer-to-PeerAdvantages

• Cost
• Ease of installation

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Peer-to-PeerDisadvantages

• Security
• Data backup
• Resource access
• Limited number of computer

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Peer-to-Peer
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Peer-to-Peer
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Client/Server
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Client/Server

• Centralized
• More expensive and requires skilled
  implementation
• Access to resources controlled by server(s)
• Scales very well
• Typical for larger networks

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Client/ServerAdvantages

• Centralized management and security
• Scalability
• Simplified backups

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Client/ServerDisadvantages

• High cost
• Administration requirements
• Single points of failure

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Client/Server
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Client/Server
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Client/Server
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NETWORK MODELS

• Centralized
• Distributed

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Centralized computing

• Data storage, resource access, processing power
  dedicated to server
• Thin clients are typical
• e.g. terminals connected to mainframe

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Centralized computing
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Distributed computing

• Each system handles its own data storage,
  resource access, processing
• Workstations

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Distributed computing
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Hybrid

• Client/Server
• Processing occurs on workstations and server
• Security handled by server
• Data storage on server with possible local copies
• Web-based solutions are becoming more common

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LAN, WAN, MAN

• Local Area Network
• Wide Area Network
• Metropolitan Area Network

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Local Area Network
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Local Area Network

• Usually confined to small area
• Building
• Campus
• Used for local resource sharing
• Files
• Printers
• May connect to other networks

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Local Area Network
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Local Area Network
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Wide Area Network
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Wide Area Network

• Spans multiple locations over distance
• Connects multiple LANs into a single network
• Uses slower, leased links between sites

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Wide Area Network
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Wide Area Network
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Metropolitan Area Network

• Technically a WAN
• Geographically restricted to a campus or city

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TOPOLOGIES

• Physical
• Logical

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TOPOLOGIES

• Bus
• Ring
• FDDI
• Star
• Mesh
• Wireless

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Bus

• Requires terminators
• All systems connect to single backbone with T
  connectors
• Common for 802.3 implementation
• Advantages/disadvantages
• Table 1.1, p. 30

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Bus
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Bus
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Star

• Each system connects to central concentrator by a
  single cable
• Easiest to expand
• Most widely used physical topology
• Advantages/disadvantages
• Table 1.2, p. 32

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Star
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Star
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Star, heirarchical
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Ring

• Logical ring
• Token ring implementation uses token access
• Each system connects to the next
• Advantages/disadvantages
• Table 1.3, p. 33

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Ring
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Ring
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Mesh

• Each system has a point to point connection with
  every other system
• Cabling can become cost prohibitive
• Most fault tolerant topology
• Advantages/disadvantages
• Table 1.4, p. 34

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Mesh
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Wireless

• Does not require cabling to each station, only to
  access points
• Shared bandwidth
• Greater flexibility/slower speeds
• Security concerns
• Advantages/disadvantages
• Table 1.5, p. 36

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Wireless
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Wireless
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FDDI

• ANSI standard
• Uses dual concentric rings for fault tolerance
• Topology and protocol

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FDDI
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FDDI
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NETWORKING STANDARDS

• FDDI
• IEEE
• 802 standards
• 802.2
• 802.3
• 802.5
• 802.11b

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IEEE Characteristics

• Speed
• Access Methods
• CSMA/CD
• Token passing
• Demand priority
• Topology
• Media

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802.2

• Defines LLC (Logical Link Control)
• Manages flow control and error detection

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802.3

• Defines Ethernet characteristics
• Most widely implemented standard
• Many additions and enhancements since original
  specification
• See Tables 1.9-1.11, pp. 46-47

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802.5

• Defines Token Ring characteristics
• IBM
• Originally standard of choice
• Highly unlikely in newer installations
• See Table 1.12, p. 47

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802.5, logical topology
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802.5, physical topology
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802.11b

• Defines Wireless Ethernet characteristics
• Other standards
• 802.11a
• 802.11g
• See Table 1.14, p.49