Ethernet Purpose: This chapter reviews general networking theory and introduces students to some of Cisco’s product line. Timing: This chapter takes approximately 1.5 hours to present. Note: This section has a product selection tool laboratory exercise at the end. Contents: Objectives—This section explains what the student will be able to do at the end of this chapter. Defining Network Components—This section displays where devices are placed in the network. Mapping Business Needs to a Hierarchical Model—This section describes the heirarchical model used in network design. OSI Model Overview—This section reviews the OSI model. Communicating Between Layers—This section describes encapsulation and de-encapsulation. Written Exercise 1—This section has a written exercise to test the students’ knowledge of the OSI model. Physical Layer Functions—This section describes the physical layer of the OSI Model. Data Link Layer Functions—This section describes the data link layer of the OSI Model. Network Layer Functions—This section describes the network layer of the OSI Model. Transport Layer Functions—This section describes the transport layer of the OSI Model.

Ethernet What is Ethernet? LAN standards Ethernet framing Ethernet topologies Ethernet devices Ethernet cabling CSMA /CD

What is Ethernet? A set of specifications for LAN communication Covers Layer 1 and Layer 2 of OSI model Most widely used LAN implementation today

Ethernet Evolution

Ethernet Specifications Physical layer specifications include- Signaling and encoding type Cabling type, length and connectors Topologies Data link layer specifications Media Access Control Framing

LAN Standards Lesson Aim <Enter lesson aim here.>

Ethernet Frame Structure

Ethernet Topologies Physical layer topologies - Bus Star

Ethernet Devices Hubs/repeaters Single broadcast and collision domain Bridge Single broadcast domain Multiple collision domains Switch Single broadcast domain – except with VLANs VLANs are broadcast dmains

Ethernet Devices Routers Segment broadcast domains to contain broadcasts Provide packet forwarding from one broadcast domain (aka VLAN; aka subnet) to another

Network Device Domains Hub Bridge Switch Router Emphasize: This figure summarizes the different collision domains and broadcast domains on various network devices. It is important that students understand the difference between the two domains. Collision Domains: 1 4 4 4 Broadcast Domains: 1 1 1 4

Ethernet Cabling Coaxial - Used in bus topology 10Base2 (thinnet); 10Base5 (thicknet) Twisted pair Used in star topology Cat 3, 5, 6

Ethernet Cabling Twisted pair Straight through Host to switch Router to switch Crossover Switch/hub to switch/hub PC/router to PC/router

UTP Implementation Crossover Cable 10BaseT/ 100BaseT Crossover Crossover Cable Hub/Switch Hub/Switch 8 1 Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC 1 8 8 1 w o o w b w g g br w br 8 1 Emphasize: Make sure each student has seen a Cat 5 cable. Describe the test for crossover cable determination. If you hold the two ends of an RJ-45 cable side by side, you'll see eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, then the cable is straight through. If the order of the colors is reversed at each end, then the cable is crossed over or rolled. Ethernet uses pins 1, 2, 3, and 6. For crossover, pin 1 is connected to 3, and oin 2 is connected to 6. Crossover cables are used for switch to switch cabling, PC to PC cabling, switch to hub cabling, hub to hub cabling, or router to router cabling. Some wires on cable ends are crossed br w g w br w o w b b o g

MAC Address Components

MAC Addresses

CSMA/CD Lesson Aim <Enter lesson aim here.>