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Chapter 2: Fundamentals of Ethernet LANs (LANs: connect nearby devices…
Chapter 2: Fundamentals of Ethernet LANs
LANs: connect nearby devices
Ethernet: Wired
Most popular wired LAN tech for the physical and data link layer
Ethernet Switch: provides many physical ports
Types of Ethernet
100 mbps: 100 BASE-T :Fast Ethernet 802.3 u
1000mbps: 1000BASE-T :Gigabit Ethernet 802.3ab
10Mbps: 10BASE-T : 802.3: Ethernet
1000mbps:1000BASE-LX 802.3 z
10Gbps: 10G BASE-T an
Types of Cabling: T (Copper 100m) and LX (Fiber 5000m)
Ethernet Frame: Source and Destination Ethernet nodes
Ethernet LAN: Combination of devices,cabling and switches working together to deliver Ethernet Frame
Wireless
IEEE(Institute of Electrical and Electronics Engineers
Building Physical Ethernet Networks
Ethernet Links and Wires
Cabling
Cross-Over : Two Like Device
Pins 1 and 2 connect to 3 and 6
Pins 3 and 6 connect to 1 and 2
Straight Through: PC to Switch
Pins 1 and 2 connect to 1 and 2
Pins 3 and 6 connect to 3 and 6
Twist wires together to cut down on crosstalk - EMI (Electomagnetic Interference)
RJ-45 connector
Eight physical locations for 8 wires called pins
Ethernet port : RJ-45
Sending Data in Ethernet Networks
Ethernet Addressing
Media Access Control(MAC) addresses
Source and Destination Ethernet Nodes (48 bits or 12 digit hex
unicast: address represents one interface to the LAN
Multicast: Frames sent will be copied and forwarded to a subset of devices on the LAN
broadcast: frames sent to this address should be delivered to all devices on LAN
FCS(Frame Check Sequence)
Ethernet trailer: gives node a way to compare sender results to discover if errors occured
Full duplex: Sender can send and receive at the same time
Half duplex: Sender cannot send and recieve
CSMA/CD: Collison Detection