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CTI-120 Lesson 2, Defining Networks with the OSI Model
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CTI-120 Lesson 2, Defining Networks with the OSI Model
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CTI-120 Lesson 2, Defining Networks with the OSIModel
Broadband - ANS-There are multiple channels that can be utilized by the communications
system
Communication Subnetwork - ANS-The guts of the OSI model transmissions, consisting of
layers 1 through 3
Content Addressable Memory Table(CAM table) - ANS-Switches that have memory set aside to
store the MAC address to port translation table
Inbound Ports - ANS-Used when ANOTHER computer wants to connect to a service or
application running on your computer
Internet Assigned Numbers Authority(IANA) - ANS-65,536 ports numbering from 0 and 65,535
Layer 1 - Physical Layer - ANS-This is the physical and electrical medium for data transfer.
Includes cables, jacks, patch panels, punch blocks, hubs, and MAUs
Layer 2 - Data Link Layer(DLL) - ANS-This layer establishes, maintains, and decides how
transfer is accomplished over the Physical Layer.
Unit of measurement on this layer is "frames"
Layer 2 Switch - ANS-The most common type of switch on a LAN. These switches are hardware
based and use the MAC address of each host computer's network adapter when deciding where
to direct frames of data.
Layer 3 - Network Layer - ANS-This layer is dedicated to routing and switching information to
different networks, LANs, or internetworks. Devices that exist on this network layer are network
layers and IP switches.
Unit of measurement used on this layer is "packets"
Layer 3 Switch - ANS-Differs from Layer 2 in that it determines paths for data using logical
addressing (IP addresses) instead of physical addressing (MAC addresses). Used in busy
enviroments in which multiple IP networks need to be connected together
Layer 4 - ANS-Governs the transmission of messages through the communications of a
subnetwork. Also takes care of ports that a computer uses for data transmission
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