Summary

Chapter 15: Advanced Networks 13Worksheet 15.3.2: ISP Connection TypesIn this worksheet, you identify the best ISP based on a given scenario. Refer to the worksheetin IT Essentials: PC Hardware and Software Labs and Study Guide, Third Edition.You may perform this worksheet now or wait until the end of the chapter.Select Network CardsEvery device on a network requires a network interface. Many types of network interfacesexist:■■■Most network interfaces for desktop computers are either integrated into the motherboardor are an expansion card that fits into an expansion slot.Most laptop network interfaces are either integrated into the motherboard or fit into aPCI Card or PCI Express Bus expansion slot.USB network adapters plug into any available USB port and can be used with bothdesktops and laptops.Before purchasing a NIC, you should research the speed, form factor, and capabilities thatthe card offers. Check the speed and capabilities of the hub or switch that will be connectedto the computer.Ethernet NICs may be backward-compatible:■■If you have a 10/100-Mbps NIC and a hub that is only 10-Mbps, the NIC operates at10 Mbps.If you have a 10/100/1000-Mbps NIC and a switch that operates at only 100 Mbps, theNIC operates at 100 Mbps.However, if you have a gigabit switch, you will most likely need to purchase a gigabit NICto match speeds. If plans exist to upgrade the network to Gigabit Ethernet in the future, besure to purchase NICs that can support the speed. Costs can vary greatly, so select NICsthat match your customer’s needs.Wireless NICs are available in many formats with many capabilities. You should selectwireless NICs based on the type of wireless network that is installed, as described in thefollowing examples:■■■802.11b NICs can be used on 802.11g networks.802.11b and 802.11g NICs can be used on 802.11n networks.802.11a can be used only on a network that supports 802.11a.Choose wireless cards that match your customer’s needs. You should know what wirelessequipment is in use and what will be installed on the network to ensure compatibility andusability. Figure 15-2 shows four types of wireless network interfaces.