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February 2008: These tests are all badly in need of update.
Some questions are incorrect because of changing technology and others just make no sense in today's IT world.
I do intend to update these, but it's a big project..

MacOSX Skills Test

Copyright 2002,2003 A.P. Lawrence

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Observing the folowing 
bash-2.05a$ ifconfig -a 
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 ::1 prefixlen 128 
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
        inet 127.0.0.1 netmask 0xff000000 
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::203:93ff:fed8:db98%en0 prefixlen 64 scopeid 0x4 
        inet 10.1.36.20 netmask 0xffffff00 broadcast 10.1.36.255
        ether 00:03:93:d8:db:98 
        media: autoselect (100baseTX <full-duplex>) status: active
        supported media: none autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <half-duplex,hw-loopback> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 100baseTX <half-duplex> 100baseTX <half-duplex,hw-loopback> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback>

bash-2.05a$ sudo arp -s 192.168.1.1 fe:ff:ff:ff:ff:ff 
cannot intuit interface index and type for 192.168.1.1

Why does this error happen?

Answer