OSI Model Flashcards
OSI Model
Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system
Physical Layer (Media Layer) # 1
Protocol Data Unit (PDU): Bit
Transmission and reception of raw bit streams over a physical medium
Cables, hubs, repeaters, etc
Physical medium transmission Bits & Volts
NO addressing
Data Link (Media Layer) # 2
PDU: Frame
Reliable transmission of data frames between two nodes connected by a physical layer
MAC addressing, media accessing, error detection
Switch, bridges, Wireless Access Points (WAP)
Network (Media Layer) # 3
PDU: Packet
Structuring and managing a multi-node network, including addressing, routing and traffic control
IPv4 and its addresses, logical addressing
Routers and Firewalls
Protocols: IP/IPX/ICMP
Packet Filtering
Node
Any device or computer that can connect to a network and generate, process, or transfer data
Segment
a subdivision of a network that links a number of devices or serves as a connection between two notes. All nodes attached to the segment have a common access to that portion of the network.
Serial (Network Backbone)
Multiple switches connected to one backbone cable
Layer 2 Ethernet Header includes ____
Source and Destination MAC addresses
Layer 2 Ethernet Trailer includes ___
CRC = Cyclic Redundancy Check
an error detection process that includes the Ethernet Header, IP Header, TCP Header and the Data in the frame
Demarcation Point
Telecommunication service entrance to the building, campus-wide backbone connections, and the interconnection to the local exchange carriers
Backbone wiring
Connects equipment rooms and telecom closets
Equipment room
The main cross-connection point for entire facility
Telecommunications closet
House the connection equipment for cross-connection to equipment room along with workstations in the surrounding area
Horizontal wiring
Runs from each workstation outlet to the telecommunication closet
Work Area
Consists of wallboxes and faceplates, connectors, and wiring used to connect work area equipment to telecom closet.
the collection of cables, connectors, and other devices that connect LAN and phone equipment within a commercial building
Premise wiring
Used in the telephone industry to terminate telecom. low-bandwidth
66 Block
Punch down block or cable termination block used for structured wiring systems; allow cross-connection to other punchdown blocks
110 Bloc
Network cable that is jacketed tightly around conductors so that fire cannot travel within the cable; used in heating, ventilating and air conditioning
Plenum cable
jacketed cable; gives off noxious of poisonous gases when burned
Polyvinyle chloride (PVC)
Floor labeling (FS-AN labeling)
F (TIA 606b Standard)
Telecom space on floor (Usually 1 letter)
FS-AN labeling
S
Patch panel ID for Horizontal cross-connection
FS-AN labeling
A (1-2 characters)
Port Number on Patch Panel
FS-AN labeling
N (2-4 numbers)
