Tài liệu giảng dạy CCNA - module 01 chapter 04 - LAN Cabling, Standards, and Topologies

Module 01 InterNetwork OverviewChapter 04 LAN Cabling, Standards, and Topologies... Table of Content1 Network Topologies 2 Cabling and Connectors 3 Wireless Communications... Network Top

Module 01 InterNetwork Overview

Chapter 04 LAN Cabling, Standards, and Topologies

Table of Content

1 Network Topologies

2 Cabling and Connectors

3 Wireless Communications

1 Network Topologies

Network Topology: Bus

that is terminated at both ends

• All the hosts connect directly to this backbone

Network Topology: Star and

Extended Star

A star topology Connects all cables

Network Topology: Ring

• A ring topology connects one host to the next and the last host to the first

• This creates a physical ring of cable

Network topology: Dual Ring

 One ring is used to transmit data under normal operations,

with the second ring for failover

 This dual-ring topology was used with the now outdated

Token Ring and Fiber Distributed Data Interface (FDDI) LANs.

Network Topology: Full mesh and Partial

mesh

location, it does not adopt the full mesh topology

network have a direct connection, but others do not

2 Cabling and Connectors

STP Cable

ScTP Cable

UTP Cable

RJ-45 Plug

Coaxial Cable

10BASE-2 AND 10BASE-5

CONNECTORS

Multimode Fiber

Single-mode Fiber

Other Optical Components

either 850nm or 1310nm LEDs are used in multimode

light usually with wavelengths of 1310nm or 1550 nm

OPTICAL CONNECTORS

• Straight Tip (ST) connector is used single mode

WIRELESS COMMUNICATION

Wireless LAN Organizations And

Standards

 A key technology contained within the 802.11 standard is

Direct Sequence Spread Spectrum (DSSS)

 DSSS applies to wireless devices operating within a 1 to 2

Mbps range

 802.11b increased transmission capabilities to 11 Mbps

 802.11a covers WLAN devices operating in the 5 GHZ

Wireless Devices And Topologies

NICs

• An access point installed to act as a central hub

How Wireless Lans Communicate

on any other 802.x network.

management, and data

shared medium.

Access/Collision Avoidance (CSMA/CA) This is

somewhat like Ethernet CSMA/CD

When a source node sends a frame, the receiving

Summary