Chapter 7 - Wireless and SOHO Networks Flashcards
Which of the following wireless IEEE standards operate on the 2.4 GHz radio frequency and are directly compatible with each other? (Choose two.)
A. 802.11a
B. 802.11b
C. 802.11ac
D. 802.11g
D, B. Both 802.11b and 802.11g operate in the 2.4 GHz range and use similar transmission standards. Some legacy devices are listed as 802.11b/g, meaning they will work with either system. Alternatively, 802.11a and 802.ac operate in the 5 GHz range.
What is the primary function of the SSID?
A. To secure communication between a web server and a browser
B. To secure communication between a server and a remote host
C. To serve as a parameter used to identify a network and configure a wireless connection
D. To serve as a type of password used to secure a wireless connection
C. - A service-set identifier (SSID) is the unique name given to achieve 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 are listed by their SSID.
Which of the following are features that allow 802.11ac to achieve higher data throughput?
A. MIMO
B. Beamforming
C. Channel bonding
D. Code division multiplexing
A, C. The two technologies that 802.11ac employs to achieve high throughput are channel bonding and MIMO. Channel bonding is the combination of multiple smaller channels into one large channel for greater bandwidth. MIMO is enhanced over 802.11n to allow for multiple inputs and outputs. 802.11ac also uses beamforming, but that helps the range, not the throughput.
Which of the following 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 Wi-Fi networks, but it is easily hacked. SPA is an upgrade, but WPA2 is more secure and incorporates the entire 802.11i standard. WPA3 is of course the safest, but it’s not one for the options. SAFER+ is used to encrypt Bluetooth communications.
You are upgrading a wireless network from Wi-Fi 5 over to Wi-Fi 6. Which of the following statements is not correct?
A. Users should get fasters speeds
B. Network range will be similar
C. Fewer users will be able to use each access point]
D. Devices may have lower power usage while connecting to the network
C. Wi-Fi 6 is faster than Wi-Fi 5, and the network range is similar. More users should be able to access each access point, not fewer. Devices may have lower power usage in Wi-Fi 6 due to a new sleep feature.
You have just installed a wireless router on your home network. Which of the following should you do to make it highly secure? (Choose all that apply.)
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, WPA2, and WPA3 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. Cable
C. Satelite
D. Fiber
D. Of the options listed, fiber provides the best speed. DSL and cable provide similar speeds but can’t match fiber. Satellite is the slowest of the options listed.
Which service allows users with private IP addresses to access the Internet using a public IP address?
A. DHCP
B. DNS
C. DSL
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 address for the user to access the Internet. DHCP assigns IP configuration information to clients. NDS resolves hostnames to IP addresses. DSL isa type of broadband Internet access.
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 2.4 GHz range, but only the first 11 are configurable. The three nonoverlapping channels are 1, 6, and 11.
You are setting up a wireless network. Which wireless standards would give you users over 40 Mbps throughput? (Choose all that apply.)
A. 802.11ac
B. 802.11b
C. 802.11g
D. 802.11n
A, C, D. Three standards listed–802.11ac (1,300 Mbps), 802.11g (54 Mbps), and 802.11n (600 Mbps) – give users the required throughput. 802.11ax would do so as well, although it’s not an option.
You have been asked to configure a network for a small office. The wireless router is installed, and now you need to connect the client computers. What do you enter on the client computers to connect to the router?
A. The administrator password
B. The security passphrase
C. The client’s MAC address
D. The default router password
B. To join the network, client computers need to find the SSID, ensure that the security settings are correct (to match the router), and enter the security passphrase. As an administrator, you should have configured this passphrase to be different from the router’s administrator password.
Which of the following technologies can operate in the 125 kHz to 134 kHz range?
A. Bluetooth
B. RFID
C. NFC
D. LTE
B. Radio frequency identification (RIFD) can operate in three frequency bands: 125 kHz to 134 kHz, 13.56 MHz, or 856 MHz to 960 MHz. Bluetooth is 2.4 GHz, NFC is 13.56 MHz, and LTE is between 600 MHz and 6 GHz
Due to channel interference, you are upgrading a wireless network from Wi-Fi 5 to Wi-Fi 6. Which feature of Wi-Fi 6 reduces channel interference?
A. OFDMA
B. BSS coloring
C. MU-MIMO
D. DFS
B. The feature of Wi-Fi 6 that reduces channel interference is Basic Service Set (BSS) coloring, which adds a field to the wireless frame that distinguishes it from others. Orthogonal Frequency Division Multiple Access (OFDMA) is a modulation technique that improves speed because it allows transmission to multiple clients at once. MU-MIMO also increases speed because in Wi-Fi 6 it works for uplink connections as well as downlink. ones. Dynamic Frequency Selection (DFS) was introduced with 802.11n, and it detects radar interference and adjust frequencies accordingly.
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 11 Mbps, while the users with 802.11g will access the network at 54 Mbps
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 11 Mbps. The users with 802.11g will access the network at 54 Mbps, unless they are communicating with the 802.11b device, which will be at 11 Mbps
D. All the users will access the network at 11 Mbps
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 WAP (or router) will be forced to slow down to accommodate the older technology.
