Subnetting How-To

What is _______ in slash notation?

Every /1, /2, etc. is 1 bit from left to right; ex. /1 is 128.0.0.0, /8 is 255.0.0.0, /17 is 255.255.128, etc.

Which host contains more network/host bits?

The host with the larger slash / notation will use more network bits and less host bits

Which device has an invalid IP address?

Subnet both IP addresses with their masks and figure out which devices (A-G) fit in the valid address range (not network or broadcast addresses!)

How many available hosts in a subnet?

2^h - 2, where h = number of host bits

How many subnets are needed for this topology?

Count number of lines connecting to the routers; each port on a router can be thought of as a separate subnet

What is the smallest summary route that will include all of the given subnets, in slash notation?

How many subnets of this size are possible in a class C? (/24)

2^n, where n = number of host bits after /24 (or, subnet/middle column of your table)