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Describe
your home WLAN setup.
(Pay attention to candidate’s confidence. Plus if the
candidate built it himself. Plus if the network is secured
additionally, regardless of the protocols used. Plus if the
candidate fought poor coverage.)
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Ad-hoc vs.
infrastructure topology. Advantages and disadvantages.
Ad-hoc networks are easy to set up. By definition ad-hoc
WLANs do not require access point, so they are cheaper.
With infrastructured WLANs one can connect to wired LAN,
enable wireless roaming for office workers, centralize WLAN
management, boost the range.
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Your
preferred brand for wireless cards and access points.
(An experienced candidate will be able to come up with
strong argument to defend his preferences. He will point to
the past projects as well.)
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Range and
throughput of 802.11a, 802.11b and 802.11g networks.
The official spec for 802.11a is 54 Mbps and 25-75 feet
indoors. The official spec for 802.11b is 11 Mbps and
100-150 feet indoors. The official spec for 802.11g is 54
Mbps and 100-150 feet indoors. An experienced candidate
will provide his own observations.
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How do you
secure a wireless network?
Forbid SSID broadcasting, enable MAC-level access where
appropriate, enable WEP, enable 802.11i where available,
enable firewalls, enable WPA.
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What does
Wi-Fi stand for?
Wireless Fidelity.
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What is
802.11i?
It’s a new IEEE standard defining wireless network
security.
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What are the
recommended channels if you’re setting up three WLANs and
want minimum interference?
1, 6 and 11 for the US, 1, 7 and 13 for Europe
and 1, 7 and 14 for Japan.
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What are
your preferred tools for wardriving? Somewhere
the names Kismet, *stumbler or others should come up. Ask
the candidate to describe his preferred configuration for
wardriving.
