Data link layer Flashcards
1
Q
What are the two sublayers in layer 4 and what are their functions
A
LLC - Logical link layer. It communicates between the networking software in the upper layers and the physical hardware in the lower layers
MAC - media access control. It is responsible for media access control and data encapsulation
2
Q
What are the 4 basic layer 2 functions
A
- Accepts a frame from the network medium
- De-encapsulates the frame to expose the new de-encapsulated packet
- Re-encapsulate it into a new frame
- Forward the new frame on the medium of the next network segment
3
Q
Characteristic of MAC address
A
- An Ethernet MAC address consists of a 6 hexadecimal vendor OUI code followed by a 6 hexadecimal vendor-assigned value.
- An Ethernet MAC address is a 48-bit address expressed using 12 hexadecimal digits. Because a byte equals 8 bits, we can also say that a MAC address is 6 bytes in length.