LEC 2 Flashcards
(31 cards)
Most basic form of communication
Direct communication
Communication is performed over the Internet
Internet communication
T/F
Computer networks are complex systems
TRUE
____involve varieties of hardware and software
components, and protocols
TASKS
T/F
Networking task is divided into several subtasks, or layers
True
an ISO standard that covers all aspects of network
communications –first introduced in the late 1970s
OSI - Open System Interconnections
a layered framework for the design of network systems that allows communication between all types of computer systems
OSI MODEL
coordinates the functions required to carry a bit
stream over a physical medium
physical layer
- is responsible for movements of individual bits
from one hop (node) to the next.
physical layer
- transforms the physical layer to a reliable link
- makes the physical layer appear error-free to the
upper layer
Data Link Layer
_____serial collection of bits
frame
___ divides the stream of bits received from the network into manageable units
framing
media access control (MAC) address
physical addressing
responsible for the source-to-destination delivery of a packet, possibly across multiple networks
network layer
T/F
packets are fragmented form of data
True
responsible for process-to-process delivery of the entire message
ensures the whole message arrives intact and in
order
Transport Layer
data link layer protocol data unit
ethernet “frame”
network later protocol data unit
IP “packet”
transport layer protocol data unit
TCP “segment”
port addressing for data delivery to a specific process
service-point addressing
establishes, maintains, and synchronizes the interaction among communicating systems
session layer
the network dialog controller
session layer
allows communication session between two processes to take place
dialog control
concerned with the syntax and semantics of the information exchanged between two systems
PRESENTATION LAYER
