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CCNA 200-301, Volume I
Chapter 2
Fundamentals of Ethernet
LANs
Objectives
• An Overview of LANs
• Building Physical Ethernet LANSs with UTP
• Building Physical Ethernet LANs with Fiber
• Sending Data in Ethernet Networks
SOHO LAN
Small Wired and Wireless SOHO LAN
Single-Building Enterprise Wired and
Wireless LAN
Types of Ethernet
Speed Common
Name
Informal IEEE
Standard
Name
Formal IEEE
Standard
Name
Cable Type,
Maximum
Length
10 Mbps Ethernet 10BASE-T 802.3 Copper, 100m
100 Mbps Fast Ethernet 100BASE-T 802.3u Copper, 100m
1000 Mbps Gigabit
Ethernet
1000BASE-LX 802.3z Fiber, 5000 m
1000 Mbps Gigabit
Ethernet
1000BASE-T 802.3ab Copper, 100 m
10 Gbps 10 Gig
Ethernet
10GBASE-T 802.3an Copper, 100 m
Ethernet LAN Forwards a Data Link
Frame Over Many Types of Links
Creating One Electrical Circuit over
One Pair to Send in One Direction
Basic Components of an Ethernet Link
RJ-45 Connectors and Ports
10-Gbps SFP+ with Cable Sitting Just
Outside a Catalyst 3560CX Switch
Using one Pair for Each Transmission
Direction with 10- and 100-Mbps
Ethernet
10Base-T and 100Base-T Straight-
Through Cable Pinout
Ethernet Straight-Through Cable
Concept
Crossover Ethernet Cable
Typical Uses for Straight-Through and
Crossover Ethernet Cables
Four-Pair Straight-Through Cable to
1000BASE-T
Components of a Fiber-Optic Cable
Transmission on Multimode Fiber with
Internal Reflection
Transmission on Single-Mode Fiber with
Laser Transmitter
Two Fiber Cables with Tx Connected
to Rx on Each Cable
A Sampling of IEEE 802.3 10-Gbps
Fiber Standards
Standard Cable Type Max Distance*
10GBASE-S MM 400m
10GBASE-LX4 MM 300m
10GBASE-LR SM 10km
10GBASE-E SM 30km
* The maximum distances are based on the IEEE standards with no repeaters.
Comparisons Between UTP, MM, and SM
Ethernet Cabling
Criteria UTP Multimode Single-mode
Relative Cost of Cabling Low Medium Medium
Relative Cost of a Switch Port Low Medium High
Approximate Max Distance 100m 500m 40km
Relative Susceptibility to Interference Some None None
Relative Risk of Copying from Cable
Emissions
Some None None
Commonly Used Ethernet Frame
Format
IEEE 802.3 Ethernet Header and Trailer
Fields
Field Field
Length in
Bytes
Description
Preamble 7 Synchronization
Start Frame
Delimiter (SFD)
1 Signifies that the next byte begins the Destination MAC Address
field.
Destination MAC
address
6 Identifies the intended recipient of this frame.
Source MAC
address
6 Identifies the sender of this frame.
Type 2 Defines the type of protocol listed inside the frame; today, most
likely identifies IP Version 4 (IPv4) or IP Version 6 (IPv6).
Data and Pad 46-1500 Holds data from a higher layer, typically an L3PDU (usually an
IPv4 or IPv6 packet). The sender adds padding to meet the
minimum length requirement for this field (46 bytes).
Frame Check
Sequence (FCS)
4 Provides a method for the receiving NIC to determine if the frame
experienced transmission errors
Structure of Unicast Ethernet
Addresses
LAN MAC Address Terminology and
Features
LAN Addressing
Term or Feature
Description
MAC Media Access Control. 802.3 (Ethernet) defines the MAC
sublayer of IEEE Ethernet.
Ethernet address,
NIC address, LAN
address
Other names often used instead of MAC address. These
terms describe the 6-byte address of the LAN interface
card.
Burned-in address The 6-byte address assigned by the vendor making the
card.
Unicast address A term for a MAC that represents a single LAN interface.
Broadcast address An address that means “all devices that reside on this LAN
right now.”
Multicast address On Ethernet, a multicast address implies some subset of
all devices currently on the Ethernet LAN.
Use of Ethernet Type Field
Example of Sending Data in a Modern
Ethernet LAN
A Collision Occurring Because of LAN
Hub Behavior
Full and Half Duplex in an Ethernet
LAN

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CCNA 200-301 Chapter 2-Fundamentals of Ethernet Lans.pptx

  • 1. CCNA 200-301, Volume I Chapter 2 Fundamentals of Ethernet LANs
  • 2. Objectives • An Overview of LANs • Building Physical Ethernet LANSs with UTP • Building Physical Ethernet LANs with Fiber • Sending Data in Ethernet Networks
  • 4. Small Wired and Wireless SOHO LAN
  • 6. Types of Ethernet Speed Common Name Informal IEEE Standard Name Formal IEEE Standard Name Cable Type, Maximum Length 10 Mbps Ethernet 10BASE-T 802.3 Copper, 100m 100 Mbps Fast Ethernet 100BASE-T 802.3u Copper, 100m 1000 Mbps Gigabit Ethernet 1000BASE-LX 802.3z Fiber, 5000 m 1000 Mbps Gigabit Ethernet 1000BASE-T 802.3ab Copper, 100 m 10 Gbps 10 Gig Ethernet 10GBASE-T 802.3an Copper, 100 m
  • 7. Ethernet LAN Forwards a Data Link Frame Over Many Types of Links
  • 8. Creating One Electrical Circuit over One Pair to Send in One Direction
  • 9. Basic Components of an Ethernet Link
  • 11. 10-Gbps SFP+ with Cable Sitting Just Outside a Catalyst 3560CX Switch
  • 12. Using one Pair for Each Transmission Direction with 10- and 100-Mbps Ethernet
  • 13. 10Base-T and 100Base-T Straight- Through Cable Pinout
  • 16. Typical Uses for Straight-Through and Crossover Ethernet Cables
  • 18. Components of a Fiber-Optic Cable
  • 19. Transmission on Multimode Fiber with Internal Reflection
  • 20. Transmission on Single-Mode Fiber with Laser Transmitter
  • 21. Two Fiber Cables with Tx Connected to Rx on Each Cable
  • 22. A Sampling of IEEE 802.3 10-Gbps Fiber Standards Standard Cable Type Max Distance* 10GBASE-S MM 400m 10GBASE-LX4 MM 300m 10GBASE-LR SM 10km 10GBASE-E SM 30km * The maximum distances are based on the IEEE standards with no repeaters.
  • 23. Comparisons Between UTP, MM, and SM Ethernet Cabling Criteria UTP Multimode Single-mode Relative Cost of Cabling Low Medium Medium Relative Cost of a Switch Port Low Medium High Approximate Max Distance 100m 500m 40km Relative Susceptibility to Interference Some None None Relative Risk of Copying from Cable Emissions Some None None
  • 24. Commonly Used Ethernet Frame Format
  • 25. IEEE 802.3 Ethernet Header and Trailer Fields Field Field Length in Bytes Description Preamble 7 Synchronization Start Frame Delimiter (SFD) 1 Signifies that the next byte begins the Destination MAC Address field. Destination MAC address 6 Identifies the intended recipient of this frame. Source MAC address 6 Identifies the sender of this frame. Type 2 Defines the type of protocol listed inside the frame; today, most likely identifies IP Version 4 (IPv4) or IP Version 6 (IPv6). Data and Pad 46-1500 Holds data from a higher layer, typically an L3PDU (usually an IPv4 or IPv6 packet). The sender adds padding to meet the minimum length requirement for this field (46 bytes). Frame Check Sequence (FCS) 4 Provides a method for the receiving NIC to determine if the frame experienced transmission errors
  • 26. Structure of Unicast Ethernet Addresses
  • 27. LAN MAC Address Terminology and Features LAN Addressing Term or Feature Description MAC Media Access Control. 802.3 (Ethernet) defines the MAC sublayer of IEEE Ethernet. Ethernet address, NIC address, LAN address Other names often used instead of MAC address. These terms describe the 6-byte address of the LAN interface card. Burned-in address The 6-byte address assigned by the vendor making the card. Unicast address A term for a MAC that represents a single LAN interface. Broadcast address An address that means “all devices that reside on this LAN right now.” Multicast address On Ethernet, a multicast address implies some subset of all devices currently on the Ethernet LAN.
  • 28. Use of Ethernet Type Field
  • 29. Example of Sending Data in a Modern Ethernet LAN
  • 30. A Collision Occurring Because of LAN Hub Behavior
  • 31. Full and Half Duplex in an Ethernet LAN