As business needs grow, customers can install a Security Plus upgrade license, enabling the Cisco ASA 5505 Adaptive Security Appliance to scale to support a higher connection capacity and a higher number of IPsec VPN users, add full DMZ support, and integrate into switched network environments through VLAN trunking support. ASA5510-SEC-BUN-K9 Specification Product Number ASA5510-SEC-BUN-K9 Product Description Cisco ASA 5510 Security Plus Firewall Edition includes 2 Gigabit Ethernet + 3 Fast Ethernet interfaces, 250 IPsec VPN peers, 2 SSL VPN peers, Active/Standby high availability, 3DES/AES license Users/Nodes Unlimited Firewall Throughput Up to 300 Mbps On the low end models, some features are limited, and uncrippling happens with installation of a Security Plus License. This enables more VLANs , or VPN peers, and also high availability.  Cisco AnyConnect is an extra licensable feature which operates IPSec or SSL tunnels to clients on PCs, iPhones or iPads. Find helpful customer reviews and review ratings for Cisco ASA5505-BUN-K9 ASA 5505 at Amazon.com. Read honest and unbiased product reviews from our users. The ASA 5505 runs only old versions of code ONLY and you can pretty much do more on the ASAv which will include the CURRENT versions of the code. Not sure what your emulator poison of choice is but I am using VIRL for my quick and dirty labbing and it's a great way to get legit licenses.