WhichofthefollowingisthedefaultSMTPport?（）
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An administrator is attempting to recover from a power failure in the data center. Which of thefollowing is the BEST way to recover the servers？（）
A. Bring up the WINS server， the DNS server， then the web server
Bring up the web server， the time clock server， then the DHCP server
C. Bring up the backup tape server， the DNS server， then the web server
D. Bring up the active directory server， the DNS server， then the web server
Atechnicianisservicingacustomer’scolorlaserprinterandnoticesexcesstonerintheprinter.WhichofthefollowingtoolswouldBESTassistthetechnicianinremovingtheexcesstoner?（）
A. Damptowel
B. Compressedair
C. Alcoholwipe
D. Computervacuum
Whichofthefollowingcommandsisusedtodeleteanemptydirectory?（）
A. RD
B. EDIT
C. DIR
D. FORMAT
Bydefault,howdoestherouterhandlechangestoitsoperationalconfiguration?（）
A. Changesarenotimplemented,butaresavedautomatically.
B. Changesarenotimplementedandmustbewrittenintomemory.
Changesareimplementedimmediatelyandsavedautomatically.
D. Changesareimplementedimmediately,butmustbewrittenintomemory.
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