OSI Bottom Layers Flashcards
What is the first layer of the OSI model?
Physical Layer
Responsible for transmitting data over different types of physical media.
What types of data can the Physical Layer transmit?
- Sending emails
- Uploading video
- Accessing a webpage
What are the types of physical media used in the Physical Layer?
- Copper Cable (UTP)
- Fiber Optic Cable
- Wireless media
What is UTP?
Unshielded Twisted Pair cable
A type of copper cable used in networking.
What is the bandwidth in networking?
The capacity of a medium to carry data
Typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).
What is throughput?
Measure of the transfer of bits across the media over a given period.
Name two factors that can impact network latency.
- Distance
- Network Traffic Congestion
What does the Data Link Layer do?
Responsible for the exchange of frames between nodes over a physical network media.
What are the two sub-layers of the Data Link Layer?
- Logical Link Control (LLC)
- Media Access Control (MAC)
What is the function of Logical Link Control (LLC)?
Defines software processes that provide services to network layer protocols.
What is the role of Media Access Control (MAC)?
Defines media access processes performed by hardware and provides addressing.
What does CSMA stand for?
Carrier Sense Multiple Access
What are the two basic services provided by the Data Link Layer?
- Data encapsulation
- Error detection
What is data encapsulation in the Data Link Layer?
Accepting Network Layer packets and packaging them into data units called frames.
What is the Frame Check Sequence (FCS)?
Used for error checking; it verifies the integrity of the transmitted frame.
What happens if the FCS does not match at the destination?
The destination deletes the frame.
Fill in the blank: The Physical Layer uses _______ addressing.
Physical Addressing
True or False: The Data Link Layer is responsible for routing data between different IP sub-networks.
False
What is the function of a MAC address?
Provides unique identification for devices on a network.
What are common speeds for multimode fiber optic cables?
Typically 1GB – 100GB
What can high latency affect in real-time applications?
Can result in noticeable delays and disruptions.
What is one method to minimize network latency?
Implementing efficient routing protocols.
What is encapsulation in the context of data link layer frames?
Adding a header and trailer to packets to create frames.
What does the Stop Frame field indicate?
Indicates the end of the frame when transmitted.
