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

1 Module 01 InterNetwork Overview Chapter 04 LAN Cabling, Standards, and Topologies 2 Table of Content 1 Network Topologies 2 Cabling and Connectors 3 Wireless Communications 3 1. Network Topologies 4 Network Topology: Bus • A bus topology uses a single backbone cable that is terminated at both ends. • All the hosts connect directly to this backbone. 5 Network Topology: Star and Extended Star A star topology Connects all cables to a central point of concentration. An extended star topology links individual stars together by connecting the hubs or switches. 6 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 7 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  This dual-ring topology was used with the now outdated Token Ring and Fiber Distributed Data Interface (FDDI) LANs. 8 Network Topology: Full mesh and Partial mesh • Each host has its own connections to all other hosts • Although the Internet has multiple paths to any one location, it does not adopt the full mesh topology. • A partial mesh means that some of the nodes in a network have a direct connection, but others do not. 9 2. Cabling and Connectors 10 STP Cable [...]... Cable 11 UTP Cable 12 RJ-45 Plug 13 Coaxial Cable 14 10BASE-2 AND 10BASE-5 CONNECTORS 15 Multimode Fiber 16 Single-mode Fiber 17 Other Optical Components •A LED producing infrared light with wavelengths of either 850nm or 1310nm LEDs are used in multimode •LASER producing a thin beam of intense infrared light usually with wavelengths of 1310nm or 1550 nm Lasers are used with single-mode 18 OPTICAL CONNECTORS... Connector (SC) is used in multimode • Straight Tip (ST) connector is used single mode • The MT-RJ connector uses the same plastic mold as an RJ-45 connector, which makes it easy to install 19 WIRELESS COMMUNICATION 20 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... 802.11b increased transmission capabilities to 11 Mbps  802.11a covers WLAN devices operating in the 5 GHZ transmission band  802.11g provides the same throughout as 802.11a but with backwards compatibility for 802.11b devices using Othogonal Frequency Division Multiplexing (OFDM) modulation technology 21 Wireless Devices And Topologies • Nodes could simply be hosts equipped with wireless NICs • An... equipped with antennae and provide wireless connectivity over a specified area referred to as a cell 22 How Wireless Lans Communicate  A node will pass frames in the same manner as on any other 802.x network  There are three types of frames: control, management, and data  A wireless frame could be as large as 2346 bytes  Collisions can occur just as they do on wired shared medium  WLANs use Carrier... Avoidance (CSMA/CA) This is somewhat like Ethernet CSMA/CD  When a source node sends a frame, the receiving node returns a positive acknowledgment (ACK) 23 Summary  Physical topology types  Cables and connectors 24 . 1 Module 01 InterNetwork Overview Chapter 04 LAN Cabling, Standards, and Topologies 2 Table of Content 1 Network Topologies 2 Cabling and Connectors 3 Wireless Communications 3 1. Network Topologies 4 Network. not. 9 2. Cabling and Connectors 10 STP Cable 11 ScTP Cable 12 UTP Cable 13 RJ-45 Plug 14 Coaxial Cable 15 10BASE-2 AND 10BASE-5 CONNECTORS 16 Multimode Fiber 17 Single-mode Fiber 18 Other. for failover.  This dual-ring topology was used with the now outdated Token Ring and Fiber Distributed Data Interface (FDDI) LANs. 8 Network Topology: Full mesh and Partial mesh • Each