Day 30 Flashcards
Where are MAC Addresses stored?
RAM
Broadcast Address
FFFF.FFFF.FFFF.FFFF
What happens when someone types in a broadcast address?
Switch floods frame out to every active port outside of the one sending the broadcast.
Methods switches use to forward frames. Describe
- Store-and-Forward: Entire frame is stored, CRC is calculated before the frame is forwarded.
- Cut-through switching: Destination MAC is read and forwarded immedaitely.
- Fragment-Free Mode: SW waits for collision window and then sends the frame.
Symmetric Switching vs Asymmetric Switching
Symmetric - Ports have to be same speed.
Asymmetric - Ports can be different speeds.
Methods Switches use to store frames
- Port based memory: Frames are stored in queues that are linked to specific incoming ports.
- Shared Memory: Frames are deposited into a common memory buffer for all ports
Another name for Ethernet
802.3
Data Link layer is divided into what two sections?
- LLC
2. MAC
The MAC sublayer within the Data Link layer has what responsibilities?
- Data encapsulation
2. Media Access Control
Ethernet speed, alternative name, standard, and cable type.
10 Mbps
10BASE-T
802.3
Copper, 100m
Fast Ethernet Speed, alternative name, standard, and cable type.
100 Mbps
100BASE-TX
802.3u
Copper 100m
Three most common ethernet standards today?
10BASE-T, 100BASE-T, 1000BASE-T
T568A Pin Out
G/W G OR/W BL BL/W OR BR/W BR
T568B Pin Out
O/W OR G/W BL BL/W GR BR/W BR
Crossover Cable
Has T568A on one side, and T568B on the other.
