Chapter 2 - Sheet1 Flashcards
Name the 7 OSI layers
Application (7), Presentation (6), Session (5), Transport (4), Network (3), Data Link (2), Physical (1)
What is the purpose of the application layer?
responsible for finding the network resources broadcast from a
server and adding flow control and error control (if the application developer chooses).
What is the purpose of the presentation layer?
presents data to the Application layer and is responsible for data translation and code formatting, like ASCII to non-ASCII conversions
What is the purpose of the session layer?
sets up, maintains, and terminates sessions between applications.
What is the purpose of the transport layer?
uses virtual circuits to create a reliable connection between two hosts
What is the purpose of the network layer?
provides logical network addressing and routing through an internetwork
What is the purpose of the data link layer?
provides framing and placing of data on the network medium
What is the purpose of the physical layer?
responsible for taking 1s and 0s and encoding them into a digital signal
for transmission on the network segment
What are the two sub-layers of the data link layer?
LLC (Logical Link Control) & MAC (Media Address Control)
What is the purpose of the LLC sub-layer of the data link layer?
An LLC header tells the Data Link layer what to do with a packet once
a frame is received. Identifies network layer protocols and then encapsulates them. The LLC sublayer is responsible primarily for
the multiplexing of Network layer protocols
What is the purpose of the MAC sub-layer of the data link layer?
The MAC sublayer is responsible for physical addressing and determining the appropriate time to place data on the network
What layer do hubs operate on?
Layer 1
What layer to repeaters operate on?
Layer 1
We generally consider that a device operates at the ____ layer it supports
Highest
What layer do switches operate on?
Layer 2 - because they understand and make decisions based on Layer 2 addresses (Data link layer)
What layer do bridges operate on?
Layer 2 - because they understand and make decisions based on Layer 2 addresses (Data link layer)
What layer do routers operate on?
Layer 3- because they route based on network addresses
What layer(s) do workstations operate on?
Application layer, or “all layers”
Which layer is responsible for converting frames from the Data Link layer into electrical signals?
Physical Layer
Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?
Application Layer
At which layer is routing implemented, enabling connections and path selection between two end systems?
Network Layer
Which layer defines how data is formatted, presented, encoded, and converted?
Presentation Layer
Which layer is responsible for creating, managing, and terminating sessions between applications?
Session Layer
Which layer manages the transmission of data across a physical link and is primarily
concerned with physical addressing and the ordered delivery of frames?
Data Link Layer
Which layer is used for reliable communication between end nodes over the network
and provides mechanisms for establishing, maintaining, and terminating virtual circuits
as well as controlling the flow of information?
Transport Layer
Which layer provides logical addressing that routers use for path determination?
Network Layer
Which layer specifies voltage, wire speed, and connector pin-outs and moves bits
between devices?
Physical Layer
Which layer combines bits into bytes and bytes into frames and uses MAC addressing?
Data Link Layer
