Data Link Layer Flashcards
What WAN Topology is this?
Mesh
What WAN Topology is this?
Point-to-Point
What WAN Topology is this?
Hub and Spoke
What WAN Topolgies exist?
- Mesh
- Point-to-Point
- Hub and Spoke
What media access control methods exist?
- CSMA/CD
- CSMA/CA
What is CSMA/CD
Collision Detection (sends and waits if there are collisions)
What is CSMA/CA
Collision Avoidance, wait until you are allowed to send
CSMA/CD (WLAN or LAN?)
LAN
CSMA/CA (WLAN or LAN?)
WLAN
When is a Media Access Control Method needed?
Half-Duplex
Sublayers of Data Link Layer
- LLC
- MAC
LLC stands for…
Logical Link Control
MAC stands for…
Media Access Control
MAC Sublayer is responsible for…
data encapsulation and accessing the media
Tasks of MAC Sublayer
- Frame delimiting
- Addressing (SRC and DEST MAC)
- Error detection
Error Detection on Data Link Layer is made through the…
FCS Trailer (Frame Checksum)
LLC enables…
to have multiple IP addresses on the same NIC (IPv4 and IPv6)
LLC adds…
Layer 2 control information to help deliver the packet to the Destination
Unused ports should always
be disabled
