Ethernet LAN Fundamentals Flashcards Preview

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Flashcards in Ethernet LAN Fundamentals Deck (24):
1

Ethernet LANs use....

cables and defines wired LAN technology only

2

These devices work to create LAN itself

LAN switch and Wireless access point

3

This device connects LANs and WANs

Router

4

Char. of 10 Mbps Ethernet

10BASE-T; 802.3; Copper, 100m

5

Char. of 100 Mbps Ethernet

aka Fast Ethernet; 802.3u; Copper 100m

6

Char. of 1000 Mbps Ehternet

aka Gigabit Ethernet; 1000BASE-LX (fiber); 802.3z, 5000 m
1000BASE-T; 802.3ab; Copper, 100m
Both requires four pairs of wires

7

Char. of 10Gbps Ethernet

aka 10 Gig Ethernet; 802.3an; Copper 100m

8

Thing that remains constant over all links using Ethernet DLL

the DLL header and trailer format

9

Ethernet frame...

refers to the header and trailer of a data link protocol, plus the data encapsulated inside that header and trailer

10

Essential definition of Ethernet LAN

a combination of user devices, LAN switches, and different forms of cabling

11

Ethernet Link

refers to any physical cable between two Ethernet nodes

12

Pinout rules

Ethernet NIC transmitters use pins 1 and 2; the NIC receivers use pins 3 and 6; same goes for hubs (orange and green pairs are used)

13

Crossover-cable pinout....

connects two-like devices to an Ethernet link, they both transmit on over the same pairs

14

Transmits on pins 1, 2

PC NICs, routers, wireless access point

15

Transmits on pins 3, 6

hubs, switches

16

Preamble (DLL header)

Synchronization

17

start frame delimiter (SFD)

signals that the next byte begins the Destination MAC address field

18

Type

Defines protocol listed inside the frame; most likely IPv4 or IPv6

19

Organizationally unique identifier (OUI)

IEEE assigns the manufacturer that sells Ethernet products a universally unique 3-byte code (24-bit, 6 hex digit)

20

Types of group addresses

Broadcast: delivers frames to all devices on Ethernet LAN
Multicast: towards certain address within Ethernet LAN

21

Frame Check Sequence

only field in the Ethernet trailer; gives receiving node a way to compare results with the sender, to discover whether errors occurred in the frame; error detection

22

Hubs forward data using...

physical layer standards, are considered Layer 1 devices; repeats any signal it receives to all ports except the incoming port

23

Switches are Layer 2 devices because...

It looks at the data link layer header and trailer and refers to its MAC address table and then use store and forward switching

24

If a collision occurs:

1. All sending nodes send a backoff algorithm indicating a jamming signal to all nodes
2. they independently choose a random time to wait before trying again to avoid unfortunate timing
3. Starts listening to frames again when done.