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.
NIC to Hubs?
Crossover
Hubs to Hubs?
Straight Through
NIC to Routers?
Straight Through
Router to Switch?
Crossover
Hub to Switch?
Straight Through
WAP to Switch?
Crossover
Which two common devices transmit on 3 ,6 while receiving on 1 , 2
Hubs and Switches
MAC Address make up
48 Bits
First half is OUI
Second half is Vender Assigned
Ethernet Fields (In Order)
Preamble SFD Destination MAC Source MAC Length Type Data/Pad FCS
