The following topics are discussed and students are provided with a 20-pages handout and overview of topics below.
- Networking terminology
- The O.S.I Model, DOD, and IP Addressing
- IP Addressing and Network classes
- Standard/Custom Subnet Masks and sub-netting Rules.
- Determine the Range of Valid Host IP addresses.
Cheat-sheet
- Protocols. topologies, hardware protocols (Ethernet, Token ring), network protocols (NetBEUI, TCP/IP, IPX/SPX), Network OS (client/server, peer-to-peer), DHCP/WINS
- RAID
To determine 2N – 2 => #required subnets you can use this table:
|
217 |
216 |
215 |
214 |
213 |
212 |
211 |
210 |
29 |
28 |
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
|
131,072 |
65,536 |
32,768 |
16,384 |
8192 |
4096 |
2048 |
1024 |
512 |
256 |
128 |
64 |
32 |
16 |
8 |
4 |
2 |
1 |
To quickly determine decimal value of # of masked off bits in an octet
|
#Bits |
Decimal value |
#Bits |
|
|
1 |
128 |
5 |
128+64+32+16+8=248 |
|
2 |
128+64= 192 |
6 |
128+64+32+16+8+4=252 |
|
3 |
128+64+32=224 |
7 |
128+64+32+16+8+4+2=254 |
|
4 |
128+64+32+16=240 |
8 |
128+64+32+16+8+4+2+1=255 |
|
Example : 255.255.1111 1100. 0000 0000: 6 masked = 252 so subnet is 255.255.252.0 |
|||
|
Class |
From |
To |
Subnet Mask | Max # networks | Max # hosts |
| Class A | = 0.x.x.x | 126.x.x.x | 255.0.0.0 |
126 |
16,777,214 |
| Class B | = 128.0.x.x | 191.255.x.x | 255.255.0.0 | 16,384 | 65,534 |
| Class C | = 192.0.0.x | 223.255.255.x | 255.255.255.0 | 2,097,152 | 254 |
Subnetting, or splitting the hosts part, is possible by defining a subnet mask.
The following is a list that shows you the right mask for the possible
subnets, shown per Class, like the following list:
|
Subnets Class A Table |
Binary |
Mask |
Hosts |
|
0 |
10000000 |
255.128.0.0 |
Invalid subnet |
|
2 |
11000000 |
255.192.0.0 |
4,194,302 |
|
6 |
11100000 |
255.224.0.0 |
2,097,150 |
|
14 |
11110000 |
255.240.0.0 |
1,048,574 |
|
30 |
11111000 |
255.248.0.0 |
524,286 |
|
62 |
11111100 |
255.252.0.0 |
262,142 |
|
126 |
11111110 |
255.254.0.0 |
131,070 |
|
254 |
11111111 |
255.255.0.0 |
65,534 |
|
Subnets Class B Table |
Binary |
Mask |
Hosts |
|
0 |
10000000 |
255..255.128.0 |
Invalid subnet |
|
2 |
11000000 |
255.255.192.0 |
16,382 |
|
6 |
11100000 |
255.255.224.0 |
8,190 |
|
14 |
11110000 |
255.255.240.0 |
4,094 |
|
30 |
11111000 |
255.255.248.0 |
2,046 |
|
62 |
11111100 |
255.255.252.0 |
1,022 |
|
126 |
11111110 |
255.255.254.0 |
510 |
|
254 |
11111111 |
255.255.255.0 |
254 |
|
Subnets Class C Table |
Binary |
Mask |
Hosts |
|
0 |
10000000 |
255.255.255.128 |
Invalid subnet |
|
2 |
11000000 |
255.255.255.192 |
62 |
|
6 |
11100000 |
255.255.255.224 |
30 |
|
14 |
11110000 |
255.255.255.240 |
14 |
|
30 |
11111000 |
255.255.255.248 |
6 |
|
62 |
11111100 |
255.255.255.252 |
2 |
|
126 |
11111110 |
255.255.255.254 |
Invalid subnet |
|
254 |
11111111 |
255.255.255.255 |
Invalid subnet |
