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CCNA 640-802 Ch.3
CCNA 640-802 Ch.3 - Subnetting, VLSM
11
Computer Networking
Professional
10/24/2012

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Term
What does IP Subnet-Zero mean?
Definition
Allows you to use the first and last subnet in your network
Term
What is a subnet mask?
Definition
Allows a recipient to distinguish between the network ID portion and the host portion of the address
Term
What are the 5 questions to ask to subnet a network
Definition
1. How many subents does the subnet mask produce?
2. How many valid hosts per subnet are there?
3. What are the valid subnets?
4. What is the broadcast address of each subnet
5. what are the valid hosts in each subnet?
Term
What is the equation to figure out the number of subnets
Definition
2^x. where x is the number of masked bits
Term
What is the equation to figure out the number of hosts per subnet
Definition
2^y - 2. Y is the number of unmasked bits
Term
Wat is the equation to figure out the valid subnets?
Definition
256 - subnet mask = block size
Term
How to you find the broadcast address?
Definition
It is always the number right before the next subnet. For example for subnets 0, 64, 128, 192. For subnet 0 the broadcast is 63.
Term
How do you find the number of valid hosts?
Definition
The numbers between, not including the first one and last one.
Term
Subnet 192.168.10.0/25
Definition
how many subnets? 2^1=2
how many hosts per subnet? 2^7-2=126
What are the valid subnets? 256-128 = 0,128
broadcast address: 127
Term
Subnet 172.16.0.0/17
Definition
How many subnets: 2^1 = 2
how many hosts: 2^15 - 2 = 32,766
Valid subnets: 256-128 = 0 & 128
Term
Why does IGRP and RIP not work for VLSM
Definition
They are classful routing protocols that do not advertise subnet mask. Default subnet mask is assumed.
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