Copyright CCNA 1 Chapter 4, Part 2 Cabling LANs and WANs By Your Name
Copyright Objectives Cabling the LANs Cabling the WANs
Copyright LAN Physical Layer Each media has advantages and disadvantages. Some of the advantage or disadvantage comparisons concern the following: –Cable length –Cost –Ease of installation –Susceptibility to interference
Copyright Ethernet in the Campus Ethernet technologies can be used in a campus network in several different ways:
Copyright Ethernet Media and Connector Requirements The cables and connector specifications used to support Ethernet implementations are derived from the Electronic Industries Association and the Telecommunications Industry Association (EIA/TIA) standards body. The categories of cabling defined for Ethernet are derived from the EIA/TIA-568 (SP-2840) Commercial Building Telecommunications Wiring Standards.
Copyright Connection Media The RJ-45 connector and jack are the most common.
Copyright UTP Implementation EIA/TIA specifies an RJ-45 connector for unshielded twisted- pair (UTP) cable. The letters RJ stand for registered jack, and the number 45 refers to a specific wiring sequence.
Copyright Attach the RJ-45
Copyright Straight-Through Cables Maintain the pin connection all the way through the cable. Wire connected to pin 1 is the same on both ends. Used to connect such devices as PCs or routers to other devices such as hubs or switches.
Copyright Crossover or Rollover Cables Cross the critical pair to properly align, transmit, and receive signals on devices with like connections. Pin 1 connected to pin 3, pin 2 connected to pin 6. Used to connect similar devices: switch to switch, switch to hub, hub to hub, router to router, PC to PC.
Copyright Repeaters: Layer 1
Copyright Repeaters A repeater solves the problem of too many nodes and not enough cable; cleans, amplifies, and resends a signal that is weakened by long cable length.
Copyright Hubs: Layer 1
Copyright Hubs Regenerate and repeat signals Used as network concentration points Multiport repeater
Copyright Hubs
Copyright Wireless Communication Wireless networks use radio frequency (RF), laser, infrared (IR), or satellite/microwaves to carry signals from one computer to another without a permanent cable connection.
Copyright Bridges: Layer 2
Copyright Bridges Designed to create two or more LAN segments, each of which is a separate collision domain Bridges filter traffic by looking at MAC addresses.
Copyright Switches: Layer 2
Copyright LAN Switches Combine the connectivity of a hub with the traffic regulation of a bridge on each port
Copyright Switches
Copyright Switches
Copyright Host Connectivity When selecting a NIC, consider the following: –Network architecture –Operating system –Media type –Data transfer speed –Available bus types
Copyright NICs Bus architectures ISA (Industry Standard Architecture) EISA (Extended ISA) PCI (Peripheral Component Interconnect) MCA (Micro Channel Architecture) PCMCIA (Personal Computer Memory Card International Association)
Copyright NICs in the OSI Model
Copyright Peer-to-Peer Networks In a peer-to-peer network, networked computers act as equal partners, or peers. In a peer-to-peer network, individual users control their own resources. The users may decide to share certain files with other users. The users may also require passwords before allowing others to access their resources.
Copyright Client/Server In a client/server arrangement, network services are located on a dedicated computer called a server. The server responds to the requests of clients. The client/server model of networking can be used to overcome the limitations of the peer- to-peer network.
Copyright Cabling the WANs
Copyright WAN Physical Layer The speed of these connections ranges from 2400 bits per second (bps) to T1 service at megabits per second (Mbps) and E1 service at Mbps. ISDN offers dial-on-demand connections or dial backup services. With the increasing demand for residential broadband high-speed services, Digital Subscriber Line (DSL) and cable modem connections are becoming more popular.
Copyright WAN Serial Connections
Copyright Routers and Serial Connections Determine whether DTE or DCE connectors are required. The DTE is the endpoint of the users device on the WAN link. The DCE is the point where responsibility for delivering data passes into the hands of the service provider. When cabling routers for serial connectivity, the routers will either have fixed or modular ports.
Copyright Routers and ISDN BRI Connections With ISDN BRI, two types of interfaces may be used: –BRI S/T and BRI U A BRI interface with an integrated NT1 is labeled BRI U. A BRI interface without an integrated NT1 is labeled BRI S/T.
Copyright Routers and DSL Connections The Cisco 827 ADSL router has one Asymmetric Digital Subscriber Line (ADSL) interface. To connect an ADSL line to the ADSL port on a router, do the following: 1. Connect the phone cable to the ADSL port on the router. 2. Connect the other end of the phone cable to the phone jack.
Copyright Routers and Cable Connections The Cisco uBR905 cable access router provides high-speed network access on the cable television system to residential and small office, home office (SOHO) subscribers.
Copyright Setting Up Console Connections The console port allows monitoring and configuration of a Cisco hub, switch, or router. To set up a connection between the terminal and the Cisco console port, perform two steps. 1. Connect the devices using a rollover cable from the console port, on the router, to the serial port, on the terminal (workstation). 2. Configure the terminal emulation application with the following common equipment (COM) port settings: 9600 bps, 8 data bits, no parity, 1 stop bit, and no flow control.