Chapter 2: Network Models (Summary) Flashcards
What is ISO and OSI?
ISO stands for International Standards Organization which created the OSI (Open Systems Interconnection) which allows diverse systems to communicate.
What are the seven-layers of the OSI model in hierarchical order?
Physical Data link Network Transport Session Presentation Application
The seven layers of OSI can be subdivided to three groups, what are these?
The network support layers which includes the physical, data link and network layers.
The user support layers which includes the session, presentation and application layers.
And the transport layer which links the network support layers and the user support layers.
What is the function of the physical layer?
It coordinates the functions required to transmit a bit stream over a physical medium.
What is the function of the data link layer?
It is responsible for delivering data units from one station to the next without errors.
What does the network layer do?
It is responsible for the source-to-destination delivery of a packet across multiple network links.
What is the transport layer for?
It is responsible for the process-to-process delivery of a packet across multiple network links.
What is the function of the session layer?
The session layer establishes, maintains, and synchronizes the interactions between communicating devices.
What does the presentation layer do?
The presentation layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.
What is the application layer for?
The application layer enables the user to access the network.
What is the difference of the TCP/IP compared to the OSI based on the number of layers?
The TCP/IP is a five-layer hierarchical protocol suite.
How many levels of addresses are used in an internet, following the TCP/IP protocols? What are they?
Four levels of addresses are used in an internet, following the TCP/IP protocols: physical (link) addresses, logical (IP) addresses, port addresses, and specific addresses.
What is a physical address?
Physical address, also known as the link address, is the address of a node as defined by its LAN or WAN.
What is an IP address?
The IP address uniquely defines a host on the internet.
What is a port address for?
The port address identifies a process on a host.
