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subnet/host question
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Matt1999
Senior Member
Registered: Mar 2001
Location:
Country: USA
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Certifications: A+, I-Net+, CNA, MCP, CCNA, IBM/AS400, LOMA/ACS
Working on: MCSA
Total Posts: 129
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 subnet/host question
Ok, here is one that I don't quiet get yet:
You have a Class-C network with a 6-bit subnet mask, how many subnets and hosts do you have?
OK, I understand that this is: 255.255.255.252
And the answer is 62 subnets and 2 hosts per subnet.
How do you calculate that from the 255.255.255.252 ?
Thanks!
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 01-17-02 08:23 PM
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wandie
Junior Member
Registered: Dec 2001
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Total Posts: 1
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6 bit subnet mask - okay, you take 6 bits from this octet (of 8) to make your subnets = 6 to the power of 2 (binary) = 64 - take two away (1 for subnet address and 1 for broadcast address) - with the remaining 2 bits from octet (of 8) you get 2 to the power of 2 = 4 hosts - take two away (1 for subnet, 1 for broadcast).
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01-17-02 08:37 PM
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dmaftei
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M
Registered: Nov 2000
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quote:
Originally posted by wandie
6 bit subnet mask - okay, you take 6 bits from this octet (of 8) to make your subnets = 6 to the power of 2 (binary) = ...
You mean 2 to the power of 6 (6 to the power of 2 is 36  )
quote:
...- take two away (1 for subnet address and 1 for broadcast address)...
When you subnet for CCNA you ignore the first and last subnets (for reasons I'm not going to discuss now). The "1 for subnet/1 for broadcast" applies to host addresses within a subnet.
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01-18-02 01:42 AM
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Clangashe
Senior Member
Registered: Nov 2001
Location: Adelaide
Country: Australia
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Certifications: ITIL,MCSE+sec W2K3, MCSA+Sec W2K3,MCSA W2K , CCNA, CNA, MCP NT4Wk
Working on: 70-299 then on to my Master's
Total Posts: 202
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01-19-02 10:35 PM
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ComputerMan
Member
Registered: Oct 2000
Location: Washington, DC
Country: USA
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Certifications: CCNP, CCNA, CCSA, MCSE(W2K), MCSA(W2K), MCSE(NT 4.0), MCP+I(NT 4.0), I-Net+, Network+, A+
Working on: MCT, CTT+, CCSE, CCDA, CCDP
Total Posts: 243
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01-20-02 05:36 AM
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freak
Moderator
M
Registered: Aug 2000
Location:
Country: USA
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Certifications: MA, M.Ed., Net+,I-Net+, Security+, CEH, CEI, CCA, CCNA, MCP+I, MCSA, MCSE NT 4.0, MCSE 2000, MCT
Working on: MCSE 2K3, Linux+, CISSP
Total Posts: 9688
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or even easier: www.mcsefreak.com/subnetting.htm
It's all there, this is how I teach it in all my classes, and it's free 
Let me know if I can help you further!
__________________
Freak, MA, M.Ed., Net+,I-Net+, Security+, CEH, CEI, CCA, CCNA, MCP+I, MCSA, MCSE NT, MCSE 2K, MCT
iCertify dot net: Free Forum, quizzes, study guides...
FreakNotes.com: free subnetting, DHCP, Network Security study guides! Also 120-page Security+ book and 100+ page Network+ book!
InfoSecWeb.com
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01-20-02 01:45 PM
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kevinvasoft
Member
Registered: Jan 2002
Location: Milton Keynes
Country: United Kingdom
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Certifications: MCSA, CCNA
Working on: CCDA, CCNP, SECURITY+, A+
Total Posts: 67
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 I don't get it
I'm new to the Cisco thing but i thought that a subnet mask of 6 bits was actually 252.0.0.0 = 11111100.00000000.00000000.00000000
Am I right or have i got it totally wrong???
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01-22-02 08:40 AM
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Yankee
Senior Member
Registered: Jun 2000
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Total Posts: 1411
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When these guys talk of a 6 bit mask they are talking "classful" six bits. Guess it's something they are taught in school because it ain't the way we talk in the real world. His example of a 255.255.255.252 is really refered to as a /30 network. A 255.255.255.0 would be called a /24 network.
I don't want to confuse anyone....
Yankee
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01-22-02 09:06 AM
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