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Assignment 3Networking DevicesLeonard Ehalt

Before beginning…

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• 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

Common Network Devices

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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

A Basic Hub

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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.

Network Interface Card (NIC)

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• 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.

Network Interface Card (NIC)

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A wireless NIC

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A wireless access point

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Bridge

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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.

Switch

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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.

Switch interface

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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

Router

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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.

Interface Configurations

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Router(config-if)#ip address 1.1.1.1 255.0.0.0Router(config-if)#no shutdownRouter(config-if)#*Oct 5 17:26:46.522: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed stateto up*Oct 5 17:26:47.522: %LINEPROTO-5-UPDOWN: Line protocol on InterfaceFastEthernet0/0, 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 1.1.1.1They can now send packets to the router

Firewall

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• 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.

Firewall

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• 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 a demilitarized zone (DMZ).

Firewall

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Planning and Implementinga Basic SOHO Network Using

Network Segmentation

Network design incorporating all device types

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Planning and Implementinga Basic SOHO Network UsingNetwork Segmentation (Cont)

Optimal design

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A wireless network

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Wireless access point setup

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