OSI & TCP/IP
Which layer of the TCP model is the Link Layer?
Layer 1
What is Encapsulation?
Enclosing data in a header and a trailer (more layers).
What are protocols in networking?
A standardized set of rules that control device communication.
What is one piece of hardware that the Data Link layer uses?
(Network bridges, Network switches, Network hubs)
What are the 2 neighboring layers of Data Link?
The physical layer (1st layer) and the network layer (3rd layer).
Which layer of the OSI Model is Data Link?
Layer 2
What is the PDU of the Data Link layer?
Frame
What would happen to a network without protocols?
Devices would not know how to communicate with each other.
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.
Which layer does the Data Link layer send frames to?
The Physical Layer
What are the 2 OSI model layers that make up the TCP model layer Link?
The Physical layer and the Data Link layer.
What are the 3 parts of a frame?
The header, data field, and trailer.
What is one protocol used in the Data Link Layer?
(SLDC, HDLC, SLIP, PPP, LAP, LCP)
What does a network bridge do?
Bridges break networks into subnetworks,which are controlled by switches and hubs. Bridges allow them to communicate with each other and control traffic.
Which layer sends packets to the Data Link layer?
The Network Layer
What is the main function of the Data Link layer?
Ensure error-free transmission of data.
What does the header do in a frame?
Addresses where the frame is going.
What does PPP stand for in networking?
Point to Point Protocol
What is the difference between a Network hub and a Network switch?
A network hub sends information to every device connected to it, while a network switch only sends information to the device it is addressed to.
The Data Link layer prevents ______ during the transmission of data in the Physical layer
Errors
What are the 2 sublayers of Data Link?
Media Access Control (MAC) and Logical Link Control (LLC).
What does the trailer do in a frame?
Helps the device check the data for errors.
What are protocols used for in the Data Link Layer?
Encapsulates data into frames, helps transmit data, and helps with error detection/correction.
How do network bridges help control traffic?
Network bridges can choose whether to forward or filter out data that is being passed through it.
What is the difference between the Data Link Layer and the Network Layer?
The Data Link Layer works on transmission of data within a network, while the Network Layer works on the transmission of data between different networks.