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Monday, October 29, 2012

Cisco Switch Network Simulator

Cisco Switch Network Simulator
Cisco switch networking simulator is a excellent programs which will provide you a virtual lab environment by simulating Cisco switch operations.  a lab manual provides hands-on experience configuration and troubleshooting of switch networks consisting of Cisco and Juniper switches.

Cisco Switch Simulator will provide you following features.

Cisco Switch Simulator is safe to downloadLab exercises provided for practice
Cisco Switch console simulator for both Cisco and Juniper switches
100+ switch commands supported
Detailed Lab Manual
Detailed help files enabling step by step experimentation.
The demo version is limited to a fewer labs login for full features , and upto global configuration mode is supported in demo version.
Support short form commands in IOS simulator.

IP addressing and Subnetting workbook

IP addressing and Subnetting workbookEvery networking student should have a solid understanding of TCP/IP subnetting (Loshin, 1997). Subnetting’s importance in modern networking is reflected by its many and varied uses. It can enhance network performance by splitting up collision and broadcast domains in a routed network (Odom, 2000). Large networks can be organized into separate subnets representing departmental, geographical, functional, or other divisions (Feit, 1997). Since hosts on different subnets can only access each other through routers, which can be configured to apply security restrictions, subnetting can also serve as a tool for implementing security policies (Bulette, 1998). Dividing a large network into subnets and delegating administrative responsibility for each subnet can make administration of a large network easier. Routers can require that a WAN link connecting two networks must itself form a separate subnet (Bulette, 1998). Troubleshooting, diagnosing, and fixing problems in a TCP/IP internetwork typically require thorough familiarity with subnetting. Network design requires both the ability to understand and carry out subnetting.

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ip subnetting workbook

IP subnetting workbook is one of the best ways to get expertise in the subject of subnetting, calculating IPs. It is all about how much you are practicing. As a networking professional, you will have to face real situations of planning network structures, decide and design subnets, calculate IP address's, almost everything. You will never have confidence to face such situations unless you haven't practiced. You can find lots of free IP subnetting workbooks on the internet. So.. start downloading and practicing. 

Download CCNA Portable Command Guide PDF

CCNA portable command guide for your self studies

About the Author

Download CCNA Portable Command Guide PDFScott Empson is the associate chair of the Bachelor of Applied Information Systems Technology degree program at the Northern Alberta Institute of Technology in Edmonton, Alberta, Canada, where he teaches Cisco routing, switching, and network design courses in a variety of different programs (certificate, diploma, and applied degree) at the postsecondary level. Scott is also the program coordinator of the Cisco Networking Academy Program at NAIT, a Regional Academy covering Central and Northern Alberta. He has earned three undergraduate degrees: a Bachelor of Arts, with a major in English; a Bachelor of Education, again with a major in English/Language Arts; and a Bachelor of Applied Information Systems Technology, with a major in Network Management. He currently  holds several industry certifications, including CCNP, CCDA, CCAI, and Network+. Before instructing at NAIT, he was a junior/senior high school English/Language Arts/Computer Science teacher at different schools throughout Northern Alberta. Scott lives in Edmonton, Alberta, with his wife, Trina, and two children, Zachariah and Shaelyn, where he enjoys reading, performing music on the weekend with his classic/80s rock band “Miss Understood,” and studying the martial art of Taekwon-Do.

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CCNA Self study guide

CCNA Free Self study guide - Download E book
ccna self study, Ccna free e book, Download CcNa study guide
Welcome to the exciting world of internetworking. This first chapter will really help you understand the basics of internetworking by fucusing on how to connect networks together using Cisco routers and switches. First, you need to know exactly what an internetwork is, right? You create an internetwork when you take two or more LANs or WANs and connect them via a router, and configure a logical network addressing scheme with a protocol such as IP.I'll be covering these four topics in this chapter

1. Internetworking basics
2. Network segmentation
3. How bridges, switches, and routers are used to physically segment a network
4. How routers are employed to create an internetwork

I’m also going to dissect the Open Systems Interconnection (OSI) model and describe each part to you in detail because you really need a good grasp of it for the solid foundation you'll build your networking knowledge upon. The OsI model has seven hierarchical layers that were developed to enable different networks to communicate reliably between disparate systems

Download Free CCNA selfstudy E-book here
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ip and subnetting

ip and subnetting
Gather a thorough knowledge in ip and subnetting is essential for a successful career in networking industry. Although there are many theories related to ip and subnetting, the best way to expertise in the subject is workout real examples yourself. You may have lot's of advantages with working out real samples of ip and subnetting other than by hard theories like parrots. In real life situations of handling even a small network (we call small network in the industry at least having 1000 hosts 8-) ) not easy as playing around packet tracer. You must have sound experience and practice to take actions quickly. Because you know few seconds are equal to billions worth transactions in some big companies almost totally depend on their branch network. So no need more explanations download following e books in ip and subnetting which includes many real life cases to solve by yourself from the very beginning. Unless you will have no excuses.

ip and subnetting workbook for CCNA students - prt 1

ip and subnetting workbook for CCNA students - prt 2

download ip and subnetting workbooks
ip and subnetting workbook - 1
ip and subnetting workbook - 2

Basic Router and Cisco Switch Instructions

Basic Device Connection
1. Connect to the device via the console cable (light blue cable) and the use of a terminal program (Windows Hyperterminal, Putty)
2. Start the selected program
3. Set the serial communications port (normally com2)
4. Connection settings are default:
Bits per second: 9600
Data Bits: 8
Parity: None
Stop Bits: 1
Flow Control: None
5. Once connected, you will see a connection prompt
Basic Router and Cisco Switch Instructions

Write Erasing Configurations (Switches and Routers)
1. Connect to the device as listed in Basic Device Connection

2. At the prompt, type enable and press 

3. Type write erase and press twice (Once to enter the command and a second time to confirm). This will remove the startup configuration from the device, but a restart will be required to load the defaults in after the write erase. 
a. For 2950, 3560 Switches, an additional step to remove the vlan.dat file is necessary to remove any VLAN configurations located on the flash memory. 
i. type show flash: 
ii. delete flash:vlan.dat 
4. Finally, reload the default information to the device. 
a. At the prompt: reload and select no when asked to save the configuration. 

Router Password Recovery (2800, 2600, 1200)
At times, a student will place a password on a router and not remove it. In this case, a password recovery must be completed to allow the device to be used again.
1. Power off the device. 
2. Power the device back on and use the break command + to stop the boot process 
3. You should see a rommon prompt (‘<’). If you do not, repeat steps 1 and 2. 4. At the prompt, type confreg 0x2142 . This tells the router to ignore the startup configuration. 
5. Now boot the router, type boot 
6. Once booted, complete the Write Erase instructions. 
7. Final step, after reload, the device will enter rommon mode again. However when it reload enter rommon again using the break sequence and type confreg 0x2102, then boot. 

Router Password Recovery (2514)
1. Power off the device. 
2. Power the device back on and use the break command + to stop the boot process 
3. You should see a rommon prompt (‘<’). If you do not, repeat steps 1 and 2. 4. Type o to see the current configuration register 
5. Type o/r 0x2142 
6. Type i to reboot the router and load the IOS 
7. Type enable and then write erase
8. This step may require multiple reboots. From the putty or terminal window, and send a special command of break to the session. This should put you in configure terminal mode (i.e. rommon). If it does not, reboot and send the break again. Once in the correct mode, type config-register 0x2102 .
9. Save the configuration and reload by issuing the commands: Copy running-config startup-config Reboot 

Switch Password Recovery (2950, 3560)
1. Connect to the device via the console port. 
2. Push in and hold the mode button to power cycle the switch until you see the switch: prompt. 
3. Issue the flash_init command. 
4. Use the dir flash command to see all the files on the switch. To remove the configuration and vlans (and thus the password), remove the following files: config.text, and vlan.dat. Issue the commands: delete flash:config.text 
Next, enter: delete flash:vlan.dat 
5. Finally, type boot and the switch will reset with a default configuration.

Switch Password Recovery (3500XL)
1. Power off the device. 
2. Power the device on, while holding the button on the front left of the device. This will put you in rommon mode (switch:)
3. Type flash_init 
4. Type dir flash: to find the name of the config file
5. Type rename flash:config.text flash:config.old
6. Type boot

Switch VLAN Creation
3500XL Switches
On the Cisco 3500 switches you must create vlans at the interface level, as there is no direct method to create a vlan. 
1. Type Enable
2. Type Configure Terminal
3. Type Interface Fa0/1
4. Type Switchport access vlan # (# is the number of the vlan you are trying to create)
5. Type End
6. Type Show Vlan to confirm your VLAN was created

Saving Configuration to Flash
Depending upon the device, the following commands will be used:
1. Write
2. Copy Run Start
3. Write Memory

Saving Configuration to TFTP Server (configuration backup)
A backup copy of a configuration for a device can be made to allow the saving of a configuration for reloading or use on a compatible device. You must have a TFTP Server setup and configured for this option and know the IP address of the TFTP server. On the selected device:
1. Type Enable
2. Type Copy Run Tftp
3. Type in the IP Address or DNS name of the TFTP Server in this case: ex.
4. Type in the name that you wish to save this configuration with (default is switch-config), in this case: Test-Config
5. Press Enter and it will upload it to your tftp server

Saving an IOS Image to a TFTP Server
There are times the main operating system for a device may need to be restored or modified to a new version.  
The current IOS can be saved to a TFTP server for future use or backup in case of failure. A TFTP server and its 
IP address must be configured before this option will be available.
1. Type Enable
2. Type Show Version, find the .bin file listed in the output. (Example Below).
3. Hit the Escape key to exit out of the Show version output. 
4. Type Copy flash:c3500xl-c3h2s-mz.120-5.WC3b.bin Tftp (Replace c3500xl-c3h2s-mz.120-
5.WC3b.bin with the name of your IOS Image)
5. Type in the IP Address or DNS name of the TFTP Server in this case:
6. Type the file name that you wish to save it with (default are shown in [ ] after the question, if you want the default just hit Enter), in this case: c3500xl-c3h2s-mz.120-5.WC3b.bin
7. Press Enter and it will upload it to your tftp server.

Loading an IOS to a device from a TFTP Server
This option will be used to restore an IOS version to a device or to load a new IOS to a device. A TFTP server must be configured and the DNS name / IP address known. 
1. Type Enable
2. Type Copy Tftp Run
3. Type in the IP Address or DNS name of the TFTP Server in this case:
4. Type in the file name that you wish to pull down, in this case: c3500xl-c3h2s-mz.120-
5. Press Enter and it will download it to your flash.

Creating Room on the Device for the IOS (Not Enough Space Error)
When loading a new IOS, the error of Not Enough Space may be received. In this case, the current image must be removed to provide the space for the new IOS to be installed. Before beginning this, you will want to save the current IOS to the TFTP server as a precaution. At any time during the delete process before step 6, the + combination may be used to cancel the process. 
1. Type Enable
2. Type Dir flash:
3. Look for the name of a .bin file
4. Type delete flash:c3500xl-c3h2s-mz.120-5.WC3b.bin
5. Hit Enter twice to confirm the name to delete and to confirm the actual deletion. 

Determining the VLAN ports of a Cisco switch
You may need to determine what ports on a switch are in specific vlans. 
1. Type Enable
2. Type Show vlan , the vlans will be listed along the left side and the ports that are associated with them are directly to the right. Notice in the diagram the Vlan is circled in red and the ports associated to that vlan are circled in blue.

Creating a Monitor (Mirrored) Port on a Cisco switch
Using a monitor port eleviates the need for using a hub to capture traffic. When setting up a monitor 
port you can choose to monitor the traffic going over a specific port or a specific VLAN. Which ever 
you choose will be used in step X. 
1. Type Enable
2. Type Configure Terminal
3. Type Interface FastEthernet 0/1 where FastEthernet 0/1 is the interface you want the traffic to be sent to. Make sure that the interface your monitoring on is in the same vlan of whatever port or vlan you are going to be monitoring. Then proceed to either step 4 or 5.
4. Type in Port Monitor FastEthernet 0/5 to monitor the traffic going over port FastEthernet 0/5 
5. Type Port Monitor vlan # (where # is the vlan number you want to monitor)

Creation and Setup of a TFTP Server
A TFTP server can easily be created on any Windows Server or desktop using the following instructions. You will need to download a free program called TFTPD32 to accomplish this task. 
1. Download Tftpd32 3.35
2. Install Tftpd32 using the default options and start it running.
3. As shown in the screen shot, all you will need to do, is configure the following:
a. Where the files are stored on the computer / server
b. The IP address of your computer that the device will attempt to contact
4. Once configured, you’re TFTP server is ready to send and receive IOS and configuration files. 

Wednesday, July 6, 2011

Subnetting Principles

Subnetting lets you borrow bits from the host and use them to allow for more networks. When subnetting, separating the network and host requires a special mechanism called a subnet mask. A subnet mask, which contains a binary bit pattern of ones and zeros, is applied to an address to extract the network ID for purposes of determining whether an address is on the local network. If not, the address is switched or routed on.

The function of a subnet mask is to extract the network ID portion of an IP destination address and determine whether an IP address exists on the local network or whether it must be routed outside the local network. If the extracted network ID matches the local network ID, the destination is located on the local network. However, if they don't match, the message must be routed outside the local network. The process used to apply the subnet mask involves Boolean algebra to filter out nonmatching bits.


Thursday, March 24, 2011

IP Subnetting

Visual ip subnettingA subnet allows the flow of network traffic between hosts to be segregated based on a network configuration. By organizing hosts into logical groups, subnetting can improve network security and performance.Subnet MaskPerhaps the most recognizable aspect of subnetting is the subnet mask. Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same "dotted-decimal" notation. For example, a very common subnet mask in its binary representation.  

Sunday, January 9, 2011

Lab guide - Lab 1-1: Cisco Remote Lab Connection

Following content has extracted from ICND (Interconnecting Cisco Networking Devices) Lab guide and added further clarifications where required for your convenience. **Important before start practicing, keep in mind that you would need a correctly wired and configured system as diagram unless some commands may not work correctly.

Complete this lab activity to practice what you learned in the related module.
Activity Objective
In this activity, you will Telnet to the terminal server to access the devices in your pod. After
completing this activity, you will be able to meet these objectives:
􀂄 Run Telnet to connect to the ICND remote lab
􀂄 Verify connectivity to the ICND remote lab terminal server
􀂄 Clear the connections to your workgroup switch and workgroup server

Visual Objective
The figure illustrates what you will accomplish in this activity.

Required Resources
These are the resources and equipment required to complete this activity:
􀂄 PC connected to an onsite laboratory or PC with an Internet connection to access the remote laboratory
􀂄 Terminal server connected to a console port of each laboratory device if using a remote laboratory
􀂄 ICND pod assigned by your instructor

Command List
The table describes the commands used in this activity.

telnet ip-address
Starts a terminal emulation program from a PC, router, or switch that permits you to access network devices remotely over the network.

Task 1: Run Telnet to Connect to the ICND Remote Lab
To begin the lab activities, you will use the Telnet utility to establish a connection to the remote lab equipment for this course.

Activity Procedure
Complete these steps from your PC:
Step 1 From the Microsoft Windows Start menu, choose Run. The Run window appears.
Step 2 In the Open field, type the telnet command followed by the IP address for your
terminal server, provided by your instructor. For example, if the terminal server
address that your instructor provided is, you would type:
If your Telnet session successfully connects to the terminal server, you should see an
opening menu similar to the following:
1 Connect to pod A
2 Connect to pod B
3 Connect to pod C
4 Connect to pod D
5 Connect to pod E
6 Connect to pod F
7 Connect to pod G
8 Connect to pod H
9 Connect to pod I
10 Connect to pod J
11 Connect to pod K
12 Connect to pod L
Please enter selection:

Step 3 At the "Please enter selection:" prompt, enter your workgroup number and
press Return. Your output should look similar to the following:
To exit back out to the menu press "CTRL+SHIFT+6" then "X".
You must clear the line before re-connecting to a device.
1 Connect to workgroup switch L
2 Connect to workgroup router L
3 Clear connection to w/g switch L
4 Clear connection to w/g router L
5 Return to main menu
Please enter selection:

The menu, called the Pod menu, lists your pod letter at the top. In the example, the current pod is Pod L.
From the menu, you can connect to either your workgroup switch or your workgroup router.

Once you connect to a network device from the terminal server, you will need to use a special keystroke sequence, Ctrl-Shift-6, then x, to return to the menu. (To do this, hold down the Shift key, press the Ctrl key and the 6, then press the x key.)

Step 4 Enter 1 to connect to your workgroup switch. You should see the following (or something similar) in your Telnet session:

Please enter selection: 1
Trying h26 (, 2058)... Open

Step 5 Press Return to access the device prompt.
Note Your output will vary depending on the switch type that you are connected to. On an
unconfigured Catalyst 2950 series switch, setup mode appears if no previous configuration
changes have been made.

Step 6 To return to the menu, enter Ctrl-Shift-6, then x. The Pod menu appears again. When you return to the Pod menu, your session to your workgroup switch is still open. You should clear all open connections on a terminal server before exiting. If you do not close your open sessions, the Cisco IOS software will prompt you to close your open connections. To close a session, you must select the appropriate
option from the menu.

Step 7 Enter option 3 to clear the connection to your workgroup switch. When the "[confirm]" prompt appears, press Return.

What does the prompt say now?

Step 8 Enter option 2 to connect to your workgroup router.
What does the prompt say now? As with the switch, you may need to press Return one time to see the prompt on your terminal screen.

Step 9 Enter Ctrl-Shift-6, then x, to return to the Pod menu.

Step 10 Enter option 4 to clear the connection to your workgroup router. When the "[confirm]" prompt appears, press Return.

Step 11 Enter option 5 to return to the Main menu from the Pod menu.

Step 12 Exit the terminal server by entering the option from the Pod menu to exit. If there is no option to exit on the menu, contact your instructor for instructions.

Step 13 If you see the "You have open connections [confirm]" prompt, enter yes and press Return. Depending on which operating system is running on your PC, you may need to press Return after terminating your Telnet session.

Step 14 Notify your instructor that you have completed the activity.

Activity Verification
You have completed this task when you attain these results:
􀂄 You can successfully log on to the terminal server and navigate the menus to access your workgroup switch and workgroup router
􀂄 You can clear the connections to your workgroup switch and workgroup router
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