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Network lesson Cheat Sheet by

An useful cheat sheet for networking basics
network     osi     dev     ethernet     wifi

Net/Host ID by Class

A
0nnnnn­nn.H­HH­HHH­HH.H­HH­HHH­HH.H­HH­HHHHH
B
10nnnn­nn.n­nn­nnn­nn.H­HH­HHH­HH.H­HH­HHHHH
C
110nnn­nn.n­nn­nnn­nn.n­nn­nnn­nn.H­HH­HHHHH
D
1110XX­XX.X­XX­XXX­XX.X­XX­XXX­XX.X­XX­XXXXX
E
1111XX­XX.X­XX­XXX­XX.X­XX­XXX­XX.X­XX­XXXXX

Subnetting

 
Binary form
Dot-­decimal notation
IP address
110000­00.1­01­010­00.0­00­001­01.1­00­00010
192.16­8.5.130
Subnet mask
111111­11.1­11­111­11.1­11­111­11.1­10­00000
255.25­5.2­55.192
Network prefix
110000­00.1­01­010­00.0­00­001­01.1­00­00000
192.16­8.5.128
Host part
000000­00.0­00­000­00.0­00­000­00.0­00­00010
0.0.0.2

Network Topology

Examples of differents networks topolo­gies.
 

Three way handshake

Illust­rates the three way handshake used for TCP connec­tions.

IP Frame

TCP/IP - Class ranges

Class
Range
Priv­ate
Class A
0.0.0.0­-1­27.2­55.25­5.255
10.0.0.0/8
Class B
128.0.0.0­-19­1.2­55.2­55.255
172.16.0.0/12
Class C
192.0.0.0­-22­3.2­55.2­55.255
192.16­8.0.0/16
Class D (multi­cast)
224.0.0.0­-23­9.2­55.2­55.255
nope
Class E (reserved)
240.0.0.0­-25­5.2­55.2­55.255
nope
 

IEEE 802

802.3 - Ethernet
802.11­a/b/g/n - Wifi
802.8 - Fiber Optic
802.15.1 - Bluetooth
802.16 - WiMAX

OSI - Protocol - Device

7 Applic­ation
FTP,HT­TP,­DNS­,SS­H,D­HCP...
6 Presen­tation
SMB,AS­CII,AFP
Router
5 Session
TCP,UDP
Switch
4 Transport
ARP,IP­,ICMP
Hub
3 Network
HDLC,PPP
2 Link
ARP,Et­her­net­,Token Ring, irDA
1 Physical
ADSL, LDSL, USB

DHCP

Client
Server
DHCP Discover -->
 
<-- DHCP Offer
DHCP Request -->
 
<-- DHCP Acknow­led­gement

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Comments

DaveChild DaveChild, 10:23 5 Dec 11

Sorry about the presentation here, monsieur_h - looks like I have some work to do for handling long lines of content. I will resolve this as quickly as I can.

monsieur_h monsieur_h, 10:25 5 Dec 11

No problem, as it works fine with the .pdf version, wich I'm gonna print for my exam anyway. I'm glad you did this tool and I'll use it for my revisions.

McDaeMonD McDaeMonD, 08:59 12 Jan 12

Hi there, good CS
I more like this CS if has more info about how much ip and host in range of /30, /29, /24, .. /3 etc.

Bill Gates Bill Gates, 08:55 20 May 12

I need to let you know about a few errors i saw that may effect the test your taking.

First TCP/UDP are layer 4 technologies. They both involve the transport of data. TCP being Transport Control Protocol and UDP being User Datagram Protocol.

Your placement of router switch and hub should also be corrected. The Hub and switch are both layer two devices that operate on the Data Link Layer they communicate through a mac address which is a layer two technology.

The difference between the two being that a switch is 1 broadcast domain and seperate collision domains and a Hub is 1 broadcast domain and 1 collision domain. Also the hub is unable to operate in full duplex mode.

Routers are layer 3 devices. They comunicate with ip addresses using routing protocols. Just wanted to give you a heads up if your using it for test

Amit Amit, 17:52 15 Aug 14

OSI - protocol - device section
is wrong.

Frank Frank, 16:34 10 Nov 14

OSI part needs some work, as what was said previously.

themask themask, 11:41 8 May 15

4 years and the OSI layers / protocols still totally wrong...

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