OSI &
TCP/IP
TCP/IP
What is the main function of the data links main function?
to decode and organize data into frames before the data is sent to the physical layer
The process of a lower layer protocol receiving data from a higher layer protocol and adds it to its own frame before the data is transferred
Encapsulation
What does PPP stand for in networking
Point to Point protocol
What hardware is used in data link?
Network bridges & Network Switches
What other layers does data link interact with?
The physical layer(1 layer) and the network layer
(3 layers)
What are the 2 sublayers of the data link layer?
Media Access Control (MAC) and Logical Link Control (LLC)
What is the PDU of the data link layer?
Frame
What does SDLC stand for
Synchronous Data Link Control
What is the purpose of Network Switches?
It communicates between devices within a network, it can send information from one device to another, without the information going to any other device in the network unlike a Hub
Why does the data link layer work with the net
network layer sends packets to the data link layer which converts packets into frames, it also helps with error detection, error correction, and flow control in the network. the network layer also helps transport data between layers
What layer is the Data link layer on
2nd layer
Why does the data link layer have to use different encapsulation methods?
it has to communicate directly with the physical layer which have different hardware that don't accept all types of encapsulation
What does HDLC stand for
High-Level Data Link Control
What does the network bridge do?
Networks are broken into segments by bridges, the segments are controlled by hubs or switches, bridges allow them to communicate with each other
How does data link work together with the physical layer?
The data link layer works with the physical layer by making sure that there are no errors during the transmission of data in the physical layer.
What does the Media Access Control(MAC) do in the data link layer?
It allows multiple devices to have access to a shared media network for communication
What are the 3 different parts of the frame in the data link layer?
Header, Data Field, Trailer
What does the Point to Point protocol do?
Similar to a WAN, encapsulates frames so that they can be transferred over physical connections
How do bridges control traffic?
Bridges help control the flow of traffic between segments since they can choose whether to forward or filter what is being passed
Which layer helps with error detection, and error correction
Network layer
What does the Logical Link Control(LLC) do in the data link layer?
responsible for flow control and detecting errors within the transmission of data
What are the purposes of the header, data field, and trailer?
Header - labels where it is going
Data Field - contains all of the data that is being sent
trailer - helps the device that is receiving the data check for errors in the package
Name 3 protocols that are used
SDLC
HDLC
SLIP
PPP
LAP
LCP
How does the hardware differ from each other?
Network Switches make sure that the right information goes to the right device in the network, While the Network Bridge makes subnetworks to better control traffic and get information to devices faster
What’s the difference between the physical layer and the network layer working with the data link layer?
The data link layer works with the physical layer by sending frames to the physical layer, which then gets decoded into bits. These bits are then sent to the correct destination with the help of the physical layer. the network layer sends packets to the data link layer which will then break these packets into frames. The main function of the network layer is to help with error detection, error correction, and flow control in the network