The Cisco ASA 5520 Adaptive Security Appliance delivers security
services with Active/Active high availability and Gigabit Ethernet
connectivity for medium-sized enterprise networks in a modular,
high-performance appliance. With four Gigabit Ethernet interfaces and
support for up to 100 VLANs, businesses can easily deploy the Cisco ASA
5520 into multiple zones within their network. The Cisco ASA 5520
Adaptive Security Appliance scales with businesses as their network
security requirements grow, delivering solid investment
protection.Businesses can extend their SSL and IPsec VPN capacity to
support a larger number of mobile workers, remote sites, and business
partners. 
Businesses can scale up to 750 SSL VPN peers on each Cisco ASA
5520 by installing an SSL VPN upgrade license; 750 IPsec VPN peers are
supported on the base platform. VPN capacity and resiliency can be
increased by taking advantage of the Cisco ASA 5520's integrated VPN
clustering and load-balancing capabilities.
The Cisco ASA 5520 supports
up to 10 appliances in a cluster, offering a maximum of 7500 SSL VPN
peers or 7500 IPsec VPN peers per cluster. For business continuity and
event planning, the Cisco ASA 5520 can also benefit from the Cisco VPN
FLEX licenses, which enable administrators to react to or plan for
short-term bursts of concurrent SSL VPN remote-access users, for up to a
2-month period.The advanced application-layer security and content
security defenses provided by the Cisco ASA 5520 can be extended by
deploying the high-performance intrusion prevention and worm mitigation
capabilities of the AIP SSM, or the comprehensive malware protection of
the CSC SSM. Using the optional security context capabilities of the
Cisco ASA 5520 Adaptive Security Appliance, businesses can deploy up to
20 virtual firewalls within an appliance to enable compartmentalized
control of security policies on a departmental level. This
virtualization strengthens security and reduces overall management and
support costs while consolidating multiple security devices into a
single appliance.
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