Network administrators can use one of several security features to verify the authenticity and integrity of Cisco IOS software images in use on their network devices.
Hey Guys, I managed to get the lab working, i used the IOS image below, not sure where you guys can download it as it was given to me by a friend.
If you work for a company with Cisco partnership, chances are you are entitled to download such software.
This value should be the same as the Embedded Hash to verify section integrity of the Cisco IOS image file.
Once comprehensive logging is in place on a network, the collected data must be used to monitor network activity for events that may indicate unauthorized access to a network device, or unauthorized actions by legitimate users.
If this value is not equal to the Embedded Hash, the Cisco IOS image file may be corrupted or intentionally altered.
Once the image has been downloaded to an administrative workstation, the MD5 hash of the local file should be verified against the hash presented by the Cisco IOS Upgrade Planner.
MD5 hash provided by Cisco, network administrators should download the Cisco IOS image file from the Cisco IOS Upgrade Planner and use the file verification methods described in this document to verify integrity of the Cisco IOS image file.
The most suitable Cisco IOS images that can be used on the GNS3 are the c3640, c3660, c3725, c3745 and c7200 IOS images.
Glad to say it is working now having downloaded your modified network file and many thanks for your interest and help to people here.
Concerning the errors received on R1 the problem can be solved by increasing the amount of memory to be used by the router from its configuration tabs.
Once AAA has been implemented to control which users can log in to particular network devices, access control should be implemented to limit from which IP addresses users may perform management functions on a network device.
Once the MD5 hash and file size for a Cisco IOS software image has been collected, network administrators can verify authenticity of the image using information provided by the Cisco IOS Upgrade Planner tool during the download process.
From here you can download Cisco 3745 IOS image for your GNS3 and perform different GNS3 labs with this IOS.
To minimize the risk associated with malicious code, it is important that network administrators develop and consistently apply a secure methodology for Cisco IOS software image management.
However, as you prepare for the Cisco exams with GNS3, we share the most appropriate Cisco IOS images for you to use.
Modify the configuration of the Cisco IOS device to load the new Cisco IOS software image upon startup.
Download Cisco IOS Images for GNS3You can download the GNS3 supported Cisco IOS images to your computer by clicking the related buttons below.
The following is an example of the information provided by the Cisco IOS Upgrade Planner tool during one of the steps required for downloading a Cisco IOS software image file from www.
Once the MD5 hash value of the installed Cisco IOS image is determined, it can also be compared with the MD5 hash provided by Cisco to verify the integrity of the image file.
