network structure elements of communication message source the channel message destination network...
TRANSCRIPT
Network StructureElements of
communication• message source• the channel• message destination
Networkdata or information
networks capable of carrying many different types of communications
Network StructureEnd Devices and their Role in the Network
– End devices form the interface between the human network and the underlying communications network
Examples: Computers, network printers, VoIP phones, security cameras, mobile handheld devices, etc.)
– Role of end devices: client, server or both
Network StructureIntermediary Devices and their Role in the Network
– Provides connectivity and ensures data flows across the network• Network Access Devices (Hubs, Switches, APs)• Internetworking Devices (Routers)• Communication Servers and Modems• Security Devices (Firewalls)
– The management of data as it flows through the network.
– Determine the path that messages should take through the network:• Regenerate and retransmit data signals• Maintain information about what pathways exist through the network
and internetwork• Notify other devices of errors and communication failures• Direct data along alternate pathways when there is a link failure• Classify and direct messages according to QoS priorities• Permit or deny the flow of data, based on security settings
Network TypesLocal Area Networks (LANs)
- An individual network usually spans a single geographical area (home, building or campus).
- Provides services and applications to people within a common organizational structure (small business, campus, region)
- Is usually administered by a single organization.
Network TypesWide Area Networks (WANs)
- LANs separated by geographic distance are connected by a network known as a Wide Area Network (WAN)
- Individual organizations usually lease connections through a telecommunications service provider (TSP) network.
- Although the organization maintains all of the policies and administration of the LANs at both ends of the connection, the policies within the communications service provider network
are controlled by the TSP.
Network TypesThe Internet is defined as a
global mesh of interconnected networks (internetworks).
The Internet is created by the interconnection of networks belonging to Internet Service Providers (ISPs) to provide access for millions of users all over the world.
The Intranet is a private connection of LANs and WANs that belongs to an organization, and is designed to be accessible only by the organization's members, employees, or others with authorization.
Layers with TCP/IP and OSI ModelTCP/IP Model
Layers with TCP/IP and OSI ModelCompare OSI and TCP/IP model
IP Addressing StructureEach device on a network
must be uniquely defined. At the Network layer, the packets of the communication need to be identified with the source and destination addresses of the two end systems
With IPv4, this means that each packet has a 32-bit source address and a 32-bit destination address in the Layer 3 header.
Network Architecture CharacteristicsFour characteristics that are addressed by
network architecture design– Fault tolerance– Scalability– Quality of service– Security
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Computer TerminologiesCPU - Central Processing UnitRAM - Random Access
MemoryROM - Read-Only MemoryCD-ROM driveFloppy disk driveHard disk driveBusSystem unitMotherboard (Mainboard)Expansion slotNetwork CardVideo CardSound CardParallel port and Serial port
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NIC: Network Interface Card
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Select a NICType of Network:
Ethernet, Token Ring, FDDIType of media:
Twisted-pair, Coaxial, Fiber-optic cableType of system bus:
PCI, ISA
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Web browser
Internet ConnectivityComputers connect to the internet in a
number of ways, can you list them?Dial-up (Modem)ISDNDSLCableNetwork
PC Basics (Components)Electronic components
TransistorIntegrated Circuit (IC)ResistorCapacitorConnectorLight Emitting Diode (LED)
PC Motherboard ComponentsBackplaneMemory ChipNetwork Interface Card
(NIC)Video CardSound CardParallel PortSerial PortMouse Port
Mouse PortKeyboard PortPower CordUniversal Serial Bus
(USB) Port
TCP/IP TestingPing
A protocol used to test TCP/IP ConnectivityStands for Packet Internet GroperSends multiple IP packets to destination
computer (typically 4 -packets)Will receive the same number of repliesInformation obtained will allow you to
ascertain network connectivity
IPConfig
Used to verify current IP configurationLab 1.1.6
Tracert
Traces the route traffic takes from source to destinationLab 1.1.7
Good luck in the test!