Using the OSI Model to Describe Network Operations Flashcards
What does the OSI Model stand for?
Open Systems Interconnect
When was the OSI model developed and why?
In the late 1970’s; to describe how networks operated.
What is the main type of copper cabling that we use?
Twisted Pair Cabling
Do the cables have any electronics in them. If so, name one.
No.
Do we use coaxial cable or twisted pair cabling to connect a cable modem to the internet?
Coaxial cable
Out on the internet, what is the preferred method of cabling and what is it essentially?
Fiber optics, which are very thin strands of glass.
How many layers are there in the OSI model.
Seven
Put the layers in order going from bottom to top:
Transport
Session
Data Link
Application
Network
Physical
Presentation
Application
Presentation
Session
Transport
Network
Data Link
Physical
Which layer do the hardware used for data networking come under?
Physical
What is the data link layer used for?
Allows devices to transfer bits of information over the cables.
What is the protocol that is mainly used at the data link layer?
Ethernet
What protocol would be used between your cable modem and the internet?
DOCSIS-3
The data link layer is layer number … ?
Two
What protocol would be used to send data to a device that is not on your local network?
Internet Protocol (IP)
IP lies on which layer?
Network Layer
What two methods of communication could be used on the network layer?
IP Addressing and IP Routing
What is the name given to the protocol that sets up a session between a client and a workstation?
Transmission Control Protocol (TCP).
What layer does TCP come under?
Transport Layer
What are websites written in and what does the acronym stand for?
HTML (Hypertext Markup Language)
When browsing websites, what protocol is used to transfer the website to your screen?
HTTP (Hypertext Transfer Protocol)
What is the encrypted version of HTTP?
HTTPS (Hypertext Transfer Protocol Secure)
Are HTTP and HTTPS the only protocols found at the application layer?
No, there are plenty more.
Do the processes of the application layer run in conjunction with all the other layers, or do they run outside of them?
They run in conjunction but only with the transport layer.
What layer number is the application number?
Seven
Why do we not use the presentation layer of the OSI model as much anymore?
We used it as a means to translate from ASCII to EBCDIC, but the technology became quite antiquated and is rarely used.
When we type on our keyboard, what translates the values so that the PC or laptop can understand it?
ASCII (American Standard Code for Information Interchange)
With IBM devices, what did they use as a substitute for ASCII?
EBCDIC (Extended Binary Coded Decimal Interchange Code)
With protocols that operate at the session layer, where do we classify them to work in for networking purposes?
Application Layer
