Transcript CCNA 1 Module 5 Cabling LANs and WANs

CCNA 1 Chapter 4, Part 2
Cabling LANs and WANs
By
Your Name
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Objectives
• Cabling the LANs
• Cabling the WANs
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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
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Ethernet in the Campus
• Ethernet technologies can be used in a
campus network in several different ways:
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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.
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Connection Media
• The RJ-45 connector and jack are the most
common.
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UTP Implementation
• EIA/TIA specifies an
RJ-45 connector for
unshielded twistedpair (UTP) cable.
The letters RJ stand
for registered jack,
and the number 45
refers to a specific
wiring sequence.
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Attach the RJ-45
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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.
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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.
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Repeaters: Layer 1
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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.
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Hubs: Layer 1
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Hubs
• Regenerate and
repeat signals
• Used as network
concentration
points
• Multiport repeater
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Hubs
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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.
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Bridges: Layer 2
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Bridges
Bridges filter traffic by
looking at MAC
addresses.
Designed to create two or more LAN segments, each of
which is a separate collision domain
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Switches: Layer 2
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LAN Switches
Combine the
connectivity of a
hub with the traffic
regulation of a
bridge on each
port
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Switches
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Switches
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Host Connectivity
• When selecting a NIC, consider the
following:
– Network architecture
– Operating system
– Media type
– Data transfer speed
– Available bus types
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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)
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NICs in the OSI Model
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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.
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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 peerto-peer network.
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Cabling the WANs
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WAN Physical Layer
• The speed of these connections ranges from
2400 bits per second (bps) to T1 service at
1.544 megabits per second (Mbps) and E1
service at 2.048 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.
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WAN Serial Connections
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Routers and Serial Connections
• Determine whether DTE or
DCE connectors are
required. The DTE is the
endpoint of the user’s 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.
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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.
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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.
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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.
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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.
2.
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Connect the devices using a rollover cable from the
console port, on the router, to the serial port, on the
terminal (workstation).
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.
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