Oct 4

Subnet example:

- A: size 70
- B: size 40
- C: size 25
- D: size 20

We get to our site using the first three bytes of the /24 IPv4 address.
Now we want to route to A, B, C or D using only a **prefix**
of the fourth byte. The use of prefixes means that each subnet size will
be a power of 2. (Could we, in theory or in practice, divide into ranges
by numeric intervals, [1..70], [71..110], [111-135], [136..155]? **How
would you then handle overlaps**?)

Step one: round up to powers of 2

Step 2: figure out how many prefix bits (subnet bits) we have for each: 1 for A, 2 for B, 3 for C and D

Step 3: Start filling them in!

A: ____

B: ____ ____

C: ____ ____ ____

D: ____ ____ ____

Chapter 9: NAT

Chapter 10: IPv4

DNS

ARP

DHCP

ICMP

Chapter 13: Routing

Basics of distance-vector routing

Slow convergence

C