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Here is a
question for those of you looking to hire NT administrators.
This question will help you distinguish between Intermediate
and Advanced level NT Administrators. Senior-level NT Administrators
should get this question right. This question is an example
of how you can incorporate diagrams to help explain a situation
or problem for the candidate to solve. As you can imagine,
problem-solving abilities are very important in networking.
Your
client requests that you subnet his newly assigned network
IP address of 137.101.0.0. Each subnet must be able to accommodate
at least 1,000 hosts. How many subnets can you create and
accommodate the 1000 hosts per subnet requirement? What subnet
mask would you use? What is the maximum number of hosts that
can actually be addressed in each of the resulting subnets?
Answer:
62 subnets
Subnet mask = 255.255.252.0
Actual number of host on each subnet = 1022
The answer is derived
from applying several layers of knowledge to the question.
Listed in order are the facts that the candidate must be able
to ascertain from the question. If the candidate can't answer
the questions, you can ask for these facts to determine their
actual skill level:
Minimal Knowledge
| What class
of address is it? |
Class
B Address
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| What is the
Default subnet mask? |
255.255.0.0
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Moderate Knowledge
| How many host
bits do you need to insure 1k hosts per subnet? |
1,000 hosts = 10 bits
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| How many bits
will remain for subnetting? |
6
bits
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About the author
Charles Dworkis is a network engineer and trainer with over
ten year's experience in information technology. Mr. Dworkis
started his career as a COBOL/CICS programmer with SHERSON
LEHMAN BROTHERS in 1987 and expanded his area of expertise
to include system design and network operating systems. After
working at such Wall Street giants as LEHMAN BROTHERS, he
was given the opportunity to begin his managerial career as
MANAGER OF INSTRUCTIONAL SERVICES for WESTCON SERVICES CORP
with responsibility for multiple sites and a staff of 30.
Subsequent positions in technical training have included work
with the world's largest authorized training company GLOBAL
KNOWLEDGE NETWORK and as NEW YORK/NEW JERSEY BRANCH MANAGER
for INFOTEC, which was honored with the 1999 Microsoft Certified
Technical Education Center of the Year award. In his consulting
practice, Mr. Dworkis has served clients of all sizes from
small and medium size business to multi-national corporations
like SONY WORLDWIDE NETWORKS. Currently, Mr. Dworkis is the
SENIOR VICE PRESIDENT AND MANAGING INSTRUCTOR of PRIMA TECHNOLOGIES,
LLC a staff supplementation firm that provides technical professionals
to IT firms and training companies on a short and long term
basis. He holds a MASTER OF PUBLIC ADMINISTRATION degree from
Baruch College, City University of New York (1992) a DIPLOMA
IN COMPUTER TECHNOLOGY from New York University (1989), a
BACHELOR OF ARTS IN POLITICAL SCIENCE & SOCIOLOGY from Regents
College (1986) and is a 1999 inductee of the prestigious INTERNATIONAL
WHO'S WHO OF INFORMATION TECHNOLOGY PROFESSIONALS. Additionally,
Mr. Dworkis is recognized as one of the world's most certified
information technology professionals, currently holding certifications
from Microsoft, Novell, Citrix, Cisco, CompTIA, prosoftraining.com,
Checkpoint, American Power Conversion, and Adaptec among others.
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