100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
Previously searched by you
CTI-130 TestOut PC Pro 2.1.6 Practice Questions (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update R150,47
Add to cart
CTI-120 Lesson 2, Defining Networks with the OSI
Model
Open Systems Interconnection(OSI) - ANS-Reference model used to define how data
communication occurs on computer networks. This model is divided into layers, each of which
provides services to the layers above and below
Layer 1 - Physical Layer - ANS-This is the physical and electrical medium for data transfer.
Includes cables, jacks, patch panels, punch blocks, hubs, and MAUs
Layer 2 - Data Link Layer(DLL) - ANS-This layer establishes, maintains, and decides how
transfer is accomplished over the Physical Layer.
Unit of measurement on this layer is "frames"
Layer 3 - Network Layer - ANS-This layer is dedicated to routing and switching information to
different networks, LANs, or internetworks. Devices that exist on this network layer are network
layers and IP switches.
Unit of measurement used on this layer is "packets"
Layer 4 - Transport Layer - ANS-This layer ensures error-free transmission between hosts
through local addressing. Manages the transmission of messages between layers 1 through 3.
When you think of ports, think of the transPORT layer.
Unit of measurement used on this layer is "segments" or "messages"
Layer 5 - Session Layer - ANS-This layer governs the establishment, termination, and
synchronization of sessions within the OS over the network and between hosts - for example,
when you log on and off.
This layer Controls the name and address database for the OS and NOS
Layer 6 - Presentation Layer - ANS-This layer translates the data format from sender to receiver
in the various OSes that may be used.
Concepts include code conversion, data compression, and file encryption
Layer 7 - Application Layer - ANS-This layer is where message creation - and, therefore packet
creation - begins. Database access is on this level. End-user protocols such as FTP, SMTP,
Telnet, and RAS work on this layer.
This layer is not the application itself, but the protocols that are initiated by this layer
Communication Subnetwork - ANS-The guts of the OSI model transmissions, consisting of
layers 1 through 3
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller topgradesdr. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R150,47. You're not tied to anything after your purchase.
