Chapter 8 - Installing Wireless and SOHO Networks Flashcards
Which of the following wireless IEEE standards operate on the 2.4GHz radio frequency and are directly compatible with each other? (Choose two.) A. 802.11a B. 802.11b C. 802.11d D. 802.11g
B, D. Both 802.11b and 802.11g operate in the 2.4GHz range and use similar transmission standards. Many devices on the market are listed as 802.11b/g, meaning they will work with either system. Alternatively, 802.11a operates in the 5GHz range. Finally, 802.11d is not a commonly implemented standard.
What is the primary function of the SSID?
A. Secure communication between a web server and browser
B. Secure communication between a server and remote host
C. A type of password used to help secure a wireless connection
D. A type of password used to secure an Ethernet 802.3 connection
C. A service-set identifier (SSID) is the unique name given to the wireless network. All hardware that is to participate on the network must be configured to use the same SSID. Essentially, it is the network name. When you are using Windows to connect to a wireless network, all available wireless networks will be listed by their SSID.
Which two of the following are standards for cellular communications? A. GSM B. SIG C. CDMA D. CCFL
A, C. The Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA) are cellular standards. A SIG is a special interest group, and cold cathode fluorescent lamp (CCFL) is a backlight on a laptop.
What is the most secure wireless encryption standard for 802.11 networks? A. WEP B. WPA C. WPA2 D. SAFER+
C. WEP was the original encryption standard developed for WiFi networks, but it is easily hacked. WPA is an upgrade, but WPA2 is more secure and incorporates the entire 802.11i standard. SAFER+ is used to encrypt Bluetooth communications.
What level of QoS is designated for interactive voice and video? A. 1 B. 4 C. 5 D. 6
C. QoS level 5 is designated for interactive voice and video, with less than 100ms delay. Level 1 is for background applications and is low priority. Level 4 is known as controlled load, which is lower priority than interactive voice and video. Level 6 only has 10ms latency but is reserved for control traffic.
You have just installed a wireless router on your home network. Which of the following should you do to make it highly secure? (Choose two.)
A. Change the default administrator name and password.
B. Change the SSID.
C. Enable WEP.
D. Configure it to channel 11.
A, B. You should always change the default administrator name and password as well as the default SSID when installing a new wireless router. Enabling encryption is also a good idea, but WPA and WPA2 are better options than WEP. The channel has nothing to do with security.
You are setting up a small office network for a client. Which Internet service would you recommend to provide the best speed? A. DSL B. Dial-up C. Satellite D. BRI ISDN E. PRI ISDN
A. Of the options listed, DSL provides the fastest speed. DSL can easily provide 12Mbps downloads. Dial-up is limited to 56Kbps, and ISDN BRI (128Kbps) and PRI (about 1.5Mbps) don’t even come close. Satellite is also much slower than DSL.
Which service allows users with private IP addresses to access the Internet using a public IP address? A. DHCP B. DNS C. DMZ D. NAT
D. Network Address Translation (NAT) allows users to have a private IP address and still access the Internet with a public IP address. NAT is installed on a router and translates the private IP address into a public one for the user to access the Internet. DHCP assigns IP configuration information to clients. DNS resolves hostnames to IP addresses. A DMZ is an area on a network between an external router and an internal router.
You are installing a single 802.11g wireless network. The office space is large enough that you need three WAPs. What channels should you configure the WAPs on to avoid communication issues? A. 2, 5, and 7 B. 1, 8, and 14 C. 1, 6, and 11 D. 3, 6, and 9
C. There are 14 communication channels in the 2.4GHz range, but only the first 11 are configurable. The three non-overlapping channels are 1, 6, and 11.
You are setting up a wireless network. Which wireless standards would give the users over 40Mbps throughput? (Choose three.) A. 802.11a B. 802.11b C. 802.11g D. 802.11n
A, C, D. Three current standards, 802.11a (54Mbps), 802.11g (54Mbps), and 802.11n (600Mbps) give users the required throughput.
Which of the following are 4G standards? (Choose two.) A. LTE B. GSM C. CDMA D. WiMAX
A, D. LTE and WiMAX are 4G standards. GSM and CDMA are cell phone communication standards. (CDMA 2000 is the same as LTE, and it’s 4G, but CDMA by itself is not 4G.)
Which of the following wireless communication methods has an operational range of 1 meter with a viewing angle of 30 degrees? A. Bluetooth B. Infrared C. WiMAX D. Satellite
B. Infrared is limited to about 1 meter, with a viewing angle of about 30 degrees. Most Bluetooth devices can transmit up to 10 meters. WiMAX has a maximum range of about 5 miles. Satellite signals can travel from the surface of the Earth to a small metal can orbiting the planet.
Which of the following are advantages to using dial-up Internet service? (Choose two.) A. High speed B. Broad availability C. Low cost D. High security
B, C. Dial-up Internet is archaic by today’s standards, but it is widely available (anywhere there is phone service) and it’s generally lower in cost than other Internet access methods. It’s definitely not high speed, and its security is really no different than that of broadband Internet access methods.
Which of the following security standards was the first to introduce a dynamic 128-bit per-packet security key? A. WEP B. TKIP C. AES D. CCMP
B. WEP could use a 64-bit or 128-bit security key, but it was a static key. TKIP introduced a dynamic per-packet key. AES and CCMP came after TKIP.
You are running an 802.11g wireless router in mixed mode. You have three 802.11g wireless NICs using the router. A new user connects using an 802.11b wireless NIC. What will happen?
A. The user with 802.11b will access the network at 11Mbps while the users with 802.11g will access the network at 54Mbps.
B. The user with 802.11b will not be able to communicate on the network.
C. The user with 802.11b will access the network at 11Mbps. The users with 802.11g will access the network at 54Mbps unless they are communicating with the 802.11b device,
which will be at 11Mbps.
D. All users will access the network at 11Mbps.
D. The good news is that 802.11g is backward compatible with 802.11b. The bad news is if you run in a mixed environment, all devices that communicate with the WAP (or router) will be forced to slow down to accommodate the older technology.
