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49 Cards in this Set

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process that allows information to pass between a sender and 1 or more receivers.
communication
10/100/1000(1G)
lan
made up of a combination of switched & leased, terrestrial & satellite, & private microwave circuits
wan
From 256Kbps or 1Mbps.
wan
156Kbsp/10 or 100Mb
man
tree structure, with a top mode called a root node
hierarchical networks
similar to a hierarchical but with interconnections between nodes between major nodes
mess networks
multiple nodes are attached and each node receives any
bus networks
PSTN
public switch telephone network
telephones commonly connected to their serving central office by a pair of copper wires
local loop
Wires coming from a house
drop line
runs to a pole where it joins other similar wires
distribution cable
interconnected set of networks that may simply appear as a single, larger network.
internet
networks in an internet, and maintain their own identity
subnets
ITU...
International Telecommunications Union
Geneva, Switzerland is the most important telecommunications standards setting body in the world.
ITU
define the connection of digital equipment, terminals & computers to the PSTN’s analog lines
v. standards
define the connection of digital equipment to digital lines
x. standards
ISO
International Standards Organization
OSI
Open Systems Interconnection
user works with computer software. It determines what data are to be sent through the network.
application
protocols: FTP, HTTP, Telenet
application
the changes of data formats that are required between the user or application program and the network. Keywords: format/syntax
presentation
Devices: encryption, compression
presentation
Protocols: ASCII, EBCDIC
presentation
establishes the communications rules between specific machines or applications. Also paces the rate of transmission. Keywords: communications manager
session
Encapsulation unit: SPDU Session Protocol data unit
session
Devices: client-server database.
session
Protocols: NFS, SQL
session
identifies the actual address of the terminal or computer that will receive the message, calculates a check sum for the entire message. Also determines if message is received correctly. Detection and recovery and information flow control. Keywords: end2end .
transport
Encapsulation unit: Segment
transport
Devices: port numbers & gateways. TCP (transmission control protocol) & UDP.
transport
TCP...
transmission control protocol
UDP ..
user datagram protocol
, routes message all the way through the network, from the transmitter to the receiver. Maintains a routing table. Address & best path, determines routes. Keyword: best path/route.
network
Encapsulation unit: Packet
network
Devices: router & L3 switch.
network
establishes a link between 2 points on a network and ensures that data are successfully transferred between the 2 points. Divides the data into smaller units for transmission. Has means for detecting transmission errors and correcting errors when they occur.
data link
Does physical addressing. Error notification.
data link
Encapsulation unit: Frame
data link
Devices: bridge, switch, and NIC (MAC (media access control) & LLC))
data link
specifies the electrical characteristics between the communications line and the terminal or computer system. Specifies how the signals are carried on the wires, what types of connectors are used. Keyword: media.
physical
Devices: repeaters, hubs, cable
physical
collection of software enabling a protocol to work
protocol stack
has destination application address, sequence number, and error detection code.
transportation header
has destination computer address and special services.
Network access header
process of adding control information from a higher layer
encapsulation
limits amount or rate sent by the transmitting end
flow control
a temporary connection between sender and receiver
virtual circuit