Assignment 3
Networking Devices
Leonard Ehalt
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Before beginning…
• The slides that you are about to see are
actual slides that I use when teaching my
Network+ class at Tarrant County College.
• Many of the figures come from the Sybex
book that CompTIA recommends for
Network+ certification
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Common Network Devices
Here’s a list of the devices we’ll be covering:
• Hub
• Network Interface Card (NIC)
• Bridge
• Switch
• Router
• Firewall
• Many of the devices shown are used in the home
consumer market and can be procured at your local
computer store for less than $100
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A Basic Hub
A hub is the device that connects all the segments of the network
together in a star topology Ethernet network. Every device in the
network connects directly to the hub through a single cable and
is used to connect multiple devices without segmenting a
network.
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Network Interface Card (NIC)
• A Network Interface Card (NIC) is installed in your
computer to connect, or interface, your computer to the
network.
• It provides the physical, electrical, and electronic
connections to the network media.
• A NIC either is an expansion card or is built right into
the computer’s motherboard.
• The NIC usually connects to the computer through
expansion slots located on the motherboard that allow
peripherals to be plugged in directly.
• In some notebook computers, NIC adapters can be
connected to the printer port or through a PC card slot.
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Network Interface Card (NIC)
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A wireless NIC
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A wireless access point
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Bridge
A bridge—specifically, a transparent bridge—is a network
device that connects two similar network segments together.
Its primary function is to keep traffic separated on either side
of the bridge, breaking up collision domains.
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Switch
Switches connect multiple segments of a network together much
like hubs do, but with three significant differences—a switch
recognizes frames and pays attention to the source and
destination MAC address of the incoming frame as well as the
port on which it was received.
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Switch interface
Switch#sh running-config
interface FastEthernet0/1
interface FastEthernet0/2
interface FastEthernet0/3
interface FastEthernet0/4
Switch(config-if)#duplex ?
auto Enable AUTO duplex configuration
full Force full duplex operation
half Force half-duplex operation
Switch(config-if)#speed ?
10 Force 10 Mbps operation
100 Force 100 Mbps operation
auto Enable AUTO speed configuration
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Router
A router is a network device used to connect network
segments together. A router can make intelligent decisions
about the best way to get network data to its destination.
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Interface Configurations
Router(config-if)#ip address 1.1.1.1 255.0.0.0
Router(config-if)#no shutdown
Router(config-if)#
*Oct 5 17:26:46.522: %LINK-3-UPDOWN: Interface
FastEthernet0/0, changed state
to up
*Oct 5 17:26:47.522: %LINEPROTO-5-UPDOWN: Line
protocol on Interface
FastEthernet0/0, changed state to up
The interface can now be connected to a
Layer 2 switch and the connected hosts
must set their default gateway address
to 1.1.1.1
They can now send packets to the router
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Firewall
• Basically, firewalls are your network’s security guards;
and to be real, they’re probably the most important
thing to implement on your network.
• That’s because today’s networks are almost always
connected to the Internet—a situation that makes
security crucial!
• A firewall protects your LAN resources from invaders
that prowl the Internet for unprotected networks, while
simultaneously preventing all or some of your LAN’s
computers from accessing certain services on the
Internet.
• You can employ them to filter packets based on rules
that you or the network administrator create and
configure to strictly delimit the type of information
allowed to flow in and out of the network’s Internet
connection.
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Firewall
• A firewall will have at least two
network connections: one to the
Internet (known as the public side)
and one to the network (known as the
private side).
• Sometimes, there is a second firewall
• This firewall is used to connect
servers and equipment that can be
considered both public and private
(like web and email servers).
• This intermediary network is known as
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a demilitarized zone (DMZ).
Firewall
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Planning and Implementing
a Basic SOHO Network Using
Network Segmentation
Network design incorporating all device types
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Planning and Implementing
a Basic SOHO Network Using
Network Segmentation (Cont)
Optimal design
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A wireless network
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Wireless access point setup
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