Ch. 2 The Fundamentals Of Ethernet LANs Flashcards
A device that provides many physical ports into which cables can be connected
A switch
What is a family of LAN standards that together define the physical and data link layers of the worlds most popular wired LAN technology called?
An Ethernet
A networking device that communicates with the Ethernet switch wirelessly via radio waves
An access point AP
UTP
Unshielded twisted pair (cable)
UTP suffix:
Fiber optic suffix:
T
X
10 Mbps name
Ethernet 10base-t
100 Mbps name
Fast Ethernet 100base-t
1000 Mbps name
Gigabit Ethernet 1000 base-t and 1000base-lx
10 gps name
10 gig Ethernet 10gbase-t
What is a combination of user devices, LAN switches, and different kinds of cabling called
Ethernet LAN
The header and trailer of a data link protocol plus the encapsulated data inside the header and trailer
A frame
What are the threes most commonly used Ethernet standards
10base-t Ethernet
100base-t fast Ethernet (FE)
1000base-t gigabit Ethernet (GE)
FE
Fast Ethernet
GE
Gigabit Ethernet
Rules two devices follow to send data are called
Encoding scheme
EMI
Electromagnetic interference
EMI between wire pairs in the same cable
Crosstalk
Any physical cables between two Ethernet nodes
Ethernet link
NIC
Network interface card
GBIC
Gigabit interface converter
SFP
Small form factor pluggables (let’s you swap connections on cisco devices, rj-45 to GBIC for example)
How many wire pairs does 10base-t and 100base-t use?
1000base-t?
2 pairs one for each direction
4 pairs
Ethernet NIC transmitters use pins _____ and _____ to transmit
1 and 2
Ethernet NIC receivers use pins ____ and _____ to receive
3 and 6
LAN switches use pins ____and ____ to receive
1 and 2
LAN receivers use pins ____ and ____ to transmit
3 and 6
Straight through cable is pinout is pinned how?
1 to 1 2 to 2 3 to 3 . . . . 6 to 6
A crossover cable is pinned how?
1 to 3
2 to 6
3 to 1
6 to 2
Use a ____ cable if the endpoints transmit on the same pin pair
Crossover cable
Use a _______. Cable if the endpoints transmit on different pin pairs
Straight through
PCs, NICS, routers, WAP(Ethernet interfaces) transmit on what pins?
1 and 2
Hubs and switches transmit in what pins?
3 and 6
How is UTP cabling pinouts for 1000base-t done?
1 to 3 2 to 6 3 to 1 4 to 7 5 to 8 6 to 2 7 to 4 8 to 5
MAC
Media access control
How long are MAC addresses?
6 byte (48 bit long) binary numbers
The term ____ refers to the fact that the address represents one interface to the Ethernet LAN
Unicast
OUI
Organizationally unique identifier
An identifier 3 byte code to ensure every MAC address is universally unique
An OUI
BIA
Burned in address
An Ethernet uses _____ ______ to identify more than one LAN interface card. A frame sent to a group can be delivered to multiple devices on the LAN or all of them
Group addresses
What are the two types of group addresses for Ethernet
Broadcast and multicast
Frames sent to a broadcast address are delivered to
All devices on the Ethernet LAN
Frames sent to a ____ _____ _____ will be copied and forwarded to a subset of the devices on the LAN that elect to receive frames
Multicast Ethernet address
The _____ ______ _____ identifies the type of network layer (layer 3) packet that sits inside the Ethernet frame
Ethernet type field
What are the most common network protocols
TCP/IP V4 and V6
Aka IPv4 and IPv6
FCS
Frame check sequence
What is the only field in the Ethernet trailer
The frame check sequence (FCS)
Logic in which a port sends data only when it is also not receiving data
Half duplex
When the NIC or switch port has no half duplex restrictions it can run in ______
Full duplex
When can a LAN use full duplex
When it has all PCs and LAN switches and no hubs
CSMA/CD
Carrier sense multiple access with collision detection
In half duplex ______ detects when someone is transmitting and waits to transmit until the first transmission is complete
CSMA/CD
What is any physical cable between two Ethernet nodes referred to
An Ethernet link
How are MAC addresses listed
As 12 digit hexadecimal numbers
The first part of a MAC code is assigned by ______ and the last part is assigned by _______
IEEE and the manufacturer
LAN addresses, Ethernet addresses, hardware addresses, burned in addresses, universal addresses, physical addresses, and MAC addresses are all type of:
Ethernet addresses
If a soho uses a LAN, and some users connect via cable while others connect wirelessly who is using the Ethernet?
The cables devices only, not the wireless ones
What standard defines gigabit Ethernet over UTP cabling
1000base-t
On an Ethernet crossover cable, pins 1 and 2 connect to pins ____ and ____
3 and 6
Pick three that would use a straight through crossover cable on a 100base-t network 100base-t network. PC and router PC and switch Hub and switch Router and hub Wireless AP(Ethernet port) and switch
PC and switch
Router and hub
WAP (Ethernet port) and switch
What happens on a half duplex when a CSMA/CD is in use and there is a collision
The algorithm defines how the computers should notice the collision and recover from the collision
Where is the Ethernet FCS field located
In the trailer, not the header
Where does the manufacturer put their unique identifier and what is it called
In the first 3 bytes, in the first half of the address, the OUI (organizationally unique identifier
What are the two ways to send one frame to multiple devices on a LAN
Broadcast and multicast
When is half duplex needed
When a hub is in the Ethernet LAN