C08 - 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. 802.11ac
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 and 802.11ac operate in the 5GHz
range.
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 parameter used to identify a network and configure a wireless connection
D. A type of password used to secure a wireless 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 features that allow 802.11ac to achieve higher data throughput? (Choose two.) 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 more multiple inputs and outputs. 802.11ac also uses beamforming,
but that helps the range, not the throughput.
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 Wi-Fi 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 BRI ISDN (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. 802.11ac B. 802.11b C. 802.11g D. 802.11n
A, C, D. Three standards listed—802.11ac (1300Mbps), 802.11g (54Mbps), and
802.11n (600Mbps)—give users the required throughput.
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 than the
router’s administrator password.
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 perpacket 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.
