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Subnetting Question
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ldbeane
Junior Member
Registered: Jun 2002
Location:
Country: United States
State:
Certifications: MCP
Working on: MCSA; MCSE; MCDBA
Total Posts: 1
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 Subnetting Question
I have the mspress book for 70-216. In the subnetting chapter it has a question stated:
You are the new administrator of a 2000 node network. There is only one router on the entire network, which provides all the computers with Internet access. The company's ISP has assigned the following eight network addresses to them:
10.24.32.0/24
10.24.33.0/24
10.24.34.0/24
10.30.35.0/24
10.30.36.0/24
10.30.37.0/24
10.30.38.0/24
10.30.39.0/24
What subnet mask could you use to minimize the complexity of the routing tables while maintaining the existing Internet connectivity?
a.) 255.255.252.0
b.) 255.255.255.252
c.) 255.255.255.248
d.) 255.255.248.0
The book says the answer is d.
Could someone please explain this. I don't see how this is possible with the second byte in the address being 24 and 30.
Thanks.
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 08-10-05 07:51 PM
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enforcer
Confusion Master
Registered: Jun 2002
Location: Wembley - Home of the big arch
Country: United Kingdom
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Certifications: MCSE NT4, MCP 2K
Working on: MCSE 2K 216,217 MCSA 2K 218
Total Posts: 10898
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09-05-06 05:14 PM
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luisjo
Senior Member
M
Registered: Jun 2002
Location: Guatemala
Country: Guatemala
State:
Certifications: MCP,Net+,I-Net+,CIWA, MCSA,CIK,CTS,NTS,CF95/98,MSW95N,MF,BM
Working on: MCDBA, MCSE,CWNA,CCDA, CCNA, SECURITY+,SERVER+, A+,CIWD,CIWS, CIWP, & EVERY CERT THAT PAYS GOOD
Total Posts: 862
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 these is why they print these answer
There most be 1,900 users on these subnet, at least 11 digits must be use for these 1,900 clients. since 2**11 is =2,048 and 2**10 = 1,024 these leaves 21 (32-11) bits for the subnet mask.
Subnet mask in binary 11111111,11111111,11111000,000
00000
subnet mask in decima
255.255.248.0
__________________
Viva el Real Madrid.
Im dreaming to play guitar like Richie Sambora.
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01-29-07 06:04 AM
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namrak
Senior Member
M
Registered: Aug 2002
Location: Seattle
Country: United States
State:
Certifications: A+, Net+, i-Net+, Srvr+, Linux+, Sec+, Proj+, MCDST, MCSA:Sec W2K
Working on: BS/IT, 70-216, 70-217, CCNA
Total Posts: 1154
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Thats perfect luisjo. This is exactly how to solve the problem because of finding the subnet that will allow for the requested amount of users of 1900. This automatically rules out answers B and C so now you need to determine between A and D which luisjo has so aptly illustrated. 
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02-13-07 09:12 PM
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