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 A+ Essentials (220-801) Cram Notes


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2.6 Install, configure, and deploy a SOHO wireless/wired router using appropriate settings

1. SSID, short for service set identifier, a unique identifier attached to the header of packets sent over a WLAN. The SSID differentiates one WLAN from another, so all access points and all devices attempting to connect to a specific WLAN must use the same SSID. WEP together with SSID, provides basic protection for the wireless network.

2. To limit the number of computers to a known few, configuring MAC filtering is a very good option. This is configured on the wireless router and not on the client computers. Any wireless network, SSID needs to be configured on the wireless router. Note that if the router broadcasts SSID, then the clients will automatically learn about the wireless network. If the SSID broadcast is disabled on the router, you need to configure the clients with proper SSID (same as that of the router SSID).

3. For local administrators, only the built-in administrator account can be used to perform a remote install. Since this account is disabled by default, please use the "net user administrator /active:yes" command from the command console.  This will enable this account to install applications remotely.

4. QoS stands for quality of service. In SOHO environment, QoS is normally set at router level. If you want to enforce QoS policies in your network, make sure you use a router, which is equipped with QoS software.

5. Adding the port exception

a. Click Start, click Run, type wscui.cpl, and then click OK.

b. In Windows Security Center, click Windows Firewall.

c. Click the Exceptions tab, and then click Add Port to display the Add a Port dialog box.

d. Type a descriptive name for the port exception and the port number that your program uses, and then select either the TCP or UDP protocol.

e. Click OK to close the Add a Port dialog box.

6. NAT (Short fo rNetwork Address Translation) is used to map internal IP addresses to external IP addresses. Typicaaly, a router or a Firewall is used for this purpose.

7. Turning OFF SSID is the easiest thing to do to prevent people outside of the premises from accessing a  wireless network. Note that for WPA encryption, you need to configure it on the wireless router and on all the workstations.  To enable MAC filtering, you need to gather the MAC addresses of all client computers, and feed it into the wireless router.

8. If you use a disk drive that was previously configured as a dynamic drive in another computer, it may show up as foreign drive. You need to import the foreign drive to show up in the drive manager as local.  

2.7 Compare and contrast Internet connection types and features

1. ISDN:ISDN BRI (Basic Rate Interface) will have two B channels, each can carry data up to 64Kbps, aggregating to 128 Kbps.

2. Infrared technology allows computing devices to communicate via short-range wireless signals. With infrared, computers can transfer files and other digital data bidirectionally. Infrared communications span very short distances. Place two infrared devices within a few feet (no more than 5 meters) of each other when networking them. Unlike Wi-Fi and Bluetooth technologies, infrared network signals cannot penetrate walls or other obstructions and work only in the direct "line of sight."

3. A DSL model most commonly uses normal telephone line (Twisted Pair or TP) for connecting to the Internet.

4. As the name implies, in asynchronous digital subscriber service (known as ASDL), the download speeds are much greater than the upload speeds. This is done based on the usage trends of Internet. Most users tend to download much more than what usually upload.

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