Freedom & Ubuntu

Writers: Matthew Helmke,
 Andrew Hudson, Paul Hudson
Language: English
Paperback: 769 pages
Data: March 15, 2011
Format: PDF
FREE DOWNLOAD!

PuTTY Config!

PuTTY is a free and open source terminal emulator application which can act as a client for the SSH, Telnet, logging, and raw TCP computing protocols and as a serial console client. The name "PuTTY" has no definitive meaning, though 'tty' is the name for a terminal in the Unix tradition, usually held to be short for teletype.

PuTTY was originally written for Microsoft Windows, but it has been ported to various other operating systems. Official ports are available for some Unix-like platforms, with work-in-progress ports to Classic Mac OS and Mac OS X, and unofficial ports have been contributed to platforms such as Symbian and Windows Mobile.

PuTTY Vs. Telnet?  PuTTY win! download

PuTTY  |ـــــ Serial  |ـــــ Enter  |ـــــ en or enable  |ـــــ conf t  |ـــــ line con or line console 0 

router name# show interface status

address  |ـــــ add

ARP (Address Resolution Protocol)

It help ip network devices find other device on the same segment or Vlan |ـــــ ARP uses a local broad cast to discover neighboring device |ـــــ ARP resolves ip addresses to mac addresses so that machines on the same data link layer media can communicate with each other.


Protocol                                                                                   Protocol ID
Internet Control Message Protocol (ICMP)                                          1
Transmission Control Protocol (TCP)                                                  6
Interior Gateway Routing Protocol (IGRP)                                          9
User Datagram Protocol (UDP)                                                           17
Internet Protocol version 6 (IPv6)                                                       41
Internet-work Packet Exchange (IPX)                                                    111

Internet Control Message Protocol (ICMP)

• It is used to send error & control information between ip network devices.
• There are many diffident messages that can be shared, including the following: 

1. Echo request: Determines whether on ip node ( a host or a router is available on network.)
2. Echo Reply: Replies to ICMP echo request.
3. Destination Unreachable: Informs the host that a datagram can't be delivered.
4. Source Quench: Informs the host to lower the rate at which it sends datagram because of congestion.

5. Redirect: Informs the host of a preferred rate.

6. Time Exceeded: Indicate that the TTL of IP datagram has expired.

What is Datagram?

A datagram is a basic transfer unit associated with a packet-switched network in which the delivery arrival time and order are not guaranteed. A datagram consists of header and data areas, where the header contains information sufficient for routing from the originating equipment to the destination without relying on prior exchanges between the equipment and the network. The source and destination addresses as well as a type field are found in the header of a datagram.

Any thing About cisco Security Device Manager (SDM)

Part 3

Installing Cisco Security Device Manager (SDM)

Part 1

Part 2

Security Device Manager (SDM) - Cisco CCNA Security Training

Do you want to have FREEDOM ?

Publisher: Hall PTR
Language: English
ISBN: 0132435942
Paperback: 448 pages
Data: August 11, 2006
Format: PDF

Publisher: Apress
Language: English
ISBN: 1590596277
Paperback: 608 pages
Data: March 15, 2006
Format: PDF

Using the Pipe

 It is the output modifier. This pipe ( | ) allow us to wade through all the configurations or other long out puts & get straight to our goods fast.

Arman#sh run | ?
Append Append redirected out put to URL ( URLs supporting append operation only )
Begin Begin with the line that matches.

Setting up SSH

Which creates a more secure session than the Telnet app that use an uncrypted data stream.
Here are the steps to setting up SSH:
1. Set your host name:
Router(config)#host name Rezakhani


2. Set the domain name (both the host name & domain name are required for the encryption keys to be generated) :
Rezakhani(config)# ip domain -name ArmanRezakhani.com

3. Generate the encryption keys for security the session:
 Rezakhani(config)# crypto key generate rsa  general -keys modulus ?
<360-2048> size of the key modulus [360-2048]
Rezakhani(config)# crypto key generate rsa general -keys modulus 1024


- The name for keys will be Rezakhani.ArmanRezakhani.com
- % The key modulus size is 1024 bits

Do command

** Beginning with IOS version 12.3

• Cisco has finally added a command to the IOS that always you to view the configuration & statics from within configuration mode.

 ** In fact with a pre -12.3 router,

• you'd get the following error if you tried to view the configuration from global - Config

you see:

Router (config)# sh run

             ^

% invalid input detected at  ' ^ '  marker

• Compare that to the output i got from entering that same command on my router that's running the 12.4 IOS

Enter configuration commands, one per line. End with CNTL/Z

OSI v TCP/IP

OSI:

you can see it, HERE

TCP/IP:

• Rout able: it can pass through routers.
• Connect dissimilar systems: Win, Mac, Unix, etc...
• Method of access to the inventor. 

App Layer: using an app, it gains access to the network.

Telnet, FTP, TFTP , NFS, SMTP, LPD, DNS, DHCP.

Transportation: provides communication sessions between the two computers.  TCP, UDP

Internet Layer: routers the data from it's source to it's source to its destination.   ARP, RARP, IP, ICMP, IGMP.

Network Layer: it sends & receive data on the wire.  Ethernet, Token Ring, Frame, Relay, ATM 

(Well-Know Port Numbers:

FTP: 20 & 21, SMTP: 25,  DNS: 53, Telnet:23, HTTP: 80, HTTPS: 443)

Subneting class c addresses **Normal Way!**

Before i start this article  i should say don't worry if you can't understanding it! you can see the fast way!

- In class C address, only 8 bits are available for defining the hosts.
- Remember that subnet bits start at the left & go to the right without skipping bits.
- This means that the only class C subnet mask can be following.

Binary                    Decimal                    CIDR
00000000                    0                              /24
10000000                    128                          /25
11000000                    192                          /26
11100000                    224                          /27

** We can't use /31 or /32 because we have to at least 2 host bits for assigning IP address to hosts

Robots & Transportation Network

فیلم ساخت و عملکرد یک شبکه حمل و نقل اتوماتیک به وسیله لگو و ربات‌های مختلف

Construction methods and performance of a transportation network  by automated   various robots

نکاتی‌ در مورد امنیت شبکه (PERSIAN)

امنیت شبکه یکی‌ از مورد بسیار بسیار مهم می‌باشد که جا دارد به آن پرداخته شود.

وقتی‌ که از امنیت شبکه صحبت می‌کنیم شامل مورد بسیار زیادی میشود که هر کدام از آنها به تنهای میتواند مورد بحث قرار گیرد،همیشه در امنیت شبکه موضوی که بسیار اهمیت دارد لایه‌های دفأعی یک شبکه می‌باشد، باید یاد آوری کرد که اولین لایه دفأعی در امنیت شبکه و حتا امنیت فیزیکی‌ وجود یک ساختار و خط مشی‌ (policy) می‌باشد که بدون آن ،لیست کنترل ، فایروال و هر لایه دیگری بدون معنی می‌باشد دقیقا مثل ساختمانی می‌باشد که پایه ندارد !

VLAN Video Learning (ENGLISH)

   

How to create Subnets

To create subnetworks you take bits from the host portion of the ip address & reserve them to define the subnet address.

This means fewer bits for hosts, so the more subnets the fewer bits available for defining hosts.

IP Subnet-Zero

This command allows you to use first & last subnet in your network design.
FOR EXAM:
The class C mask of 192 provides subnets 64 & 128.
BUT with the ip subnet-zero command, you now get to use subnets 0 , 64, 128 & 192.
* that is two more subnets for every subnet mask use.

Subneting a class C address *** THE FAST WAY! ***

You need to do is answer five simple questions:

1. How many subnets does the chosen subnet mask produce?
2. How many valid hosts per subnet are available?
3. What are the valid subnets?
4. what's the broad cast address of each subnet?
5. what are the valid hosts in each subnet?

well ...

Cisco Switch 2600 Presentation!

LAN & WAN Interface Descriptions

• LAN Interface Descriptions:

Atlanta (Router`s name) (config)# int e0
Atlanta (config-if)# description sales lan
Atlanta (config)# int e1
Atlanta (config-if)# description marketing lan

• WAN Interface Descriptions

Titanic (Router`s name) (config-if) int e1
Titanic (config-if)# desc wan to maimai circuit: anythings!