Statefull packet inspection (Context-Based Access Control or CBAC) to secure the perimeter.
This image is highly regarded in the GNS3 community as the "gold standard" for learning Cisco IOS fundamentals without the massive resource overhead of modern virtual images like Cisco vIOS.
Some small branches with low throughput (under 30 Mbps) continue to run 2691s as low-cost VPN terminators. The advipservicesk9 image provides AES encryption without requiring a separate security appliance. C2691-advipservicesk9-mz.124-17.image
镜像传输完成后，需要配置路由器从新镜像启动：
Router# configure terminal Router(config)# no boot system Router(config)# boot system flash:C2691-advipservicesk9-mz.124-17.image Router(config)# exit Router# copy running-config startup-config Router# reload Use code with caution. It was positioned between the 2600XM series and
The is a modular access router released in the early 2000s. It was positioned between the 2600XM series and the 2800 series.
: Defines the feature set. This stands for Advanced IP Services with Strong Encryption (3DES/AES) . It is one of the most comprehensive feature sets available for this generation of routers. C2691-advipservicesk9-mz.124-17.image
Router# copy tftp flash Address or name of remote host [192.168.1.100]? Source filename [C2691-advipservicesk9-mz.124-17.image]? Destination filename [C2691-advipservicesk9-mz.124-17.image]?
The IOS version 12.4(17) was released in 2006 and has been a stable and widely used version for many years. This particular version provides a good balance between features, stability, and support.
The c2691-advipservicesk9-mz.124-17.image remains a highly valuable asset for network simulation in GNS3 and for running stable, secure, and advanced-feature routing on physical Cisco 2691 routers. Its combination of Advanced IP Services and the stable 12.4(17) release makes it a go-to image for CCNA and CCNP preparation.