ASA5520-BUN-K9 - Cisco ASA 5520 Adaptive Security Appliance Overview
ASA5520-BUN-K9 - Cisco ASA 5520 Adaptive Security Appliance is a genuine network security and threat protection product from Cisco, a global name in networking whose platforms are used by enterprises, service providers and data-center operators alike. Belonging to the Cisco family, the ASA5520-BUN-K9 unit is built to the original factory specification, so it integrates with existing Cisco deployments predictably and behaves exactly as the platform documentation describes. In the network, it is deployed as a standalone unit or as part of a larger managed network, following the standard operating procedures of the platform.
From a specification standpoint, it offers 4 ports for client, server or uplink connectivity; aggregate capacity of 450 Mbps. These are the original factory figures for this model, giving administrators a clear picture of what the unit can deliver before it enters service. Standard mounting, cabling and management practices apply, so deployment follows the same procedures as other Cisco hardware already running in the environment.
Typical deployments include perimeter protection with stateful inspection, branch-office security with VPN and threat prevention, and data-center north-south traffic filtering. Organizations commonly source it for refresh programs, capacity expansion and spares management, keeping a tested unit on hand so outages stay short and replacements are predictable. The factory detail for this unit reads: “ASA 5520 Security Appliance with SW, HA, 4GE+1FE, 3DES/AES, Cisco ASA 5500 Series Firewall Edition Bundles”. This makes it a practical choice when original-spec hardware is required at a predictable cost.
Every unit at LinkNewNet is inspected and tested before dispatch, and stock is graded, cleaned and verified for correct operation, including port status, console access and firmware state. Our warranty coverage and responsive technical support protect the purchase after it arrives, and our team can confirm revision levels and software compatibility before you order. For volume requirements we also offer configuration checks and staged delivery options.
Contact our sales team for current availability, lead time and shipping options for the ASA5520-BUN-K9. We respond quickly with stock status and a firm quote, so you can plan the refresh or expansion with confidence.
Key Specifications
Applications
Perimeter Security
Stateful inspection and threat prevention at the edge.
Branch Protection
Secure branch offices with VPN and UTM.
Data Center
High-throughput filtering for north-south traffic.
Buying a Pre-Owned ASA5520-BUN-K9
Verify the unit is tested, firmware confirmed, and condition documented. Every unit is fully tested and warranty covered. Contact our team for current stock and availability.
ASA5520-BUN-K9 Specification | |
Product Number | ASA5520-BUN-K9 |
Product Description | ASA 5520 Security Appliance with SW, HA, 4GE+1FE, 3DES/AES, Cisco ASA 5500 Series Firewall Edition Bundles |
Users/Nodes | Unlimited |
Firewall Throughput | Up to 450 Mbps |
Maximum Firewall and IPS Throughput | ● Up to 225 Mbps with AIP-SSM-10 ● Up to 375 Mbps with AIP-SSM-20 ● Up to 450 Mbps with AIP-SSM-40 |
3DES/AES VPN Throughput | Up to 225 Mbps |
IPsec VPN Peers | 750 |
SSL VPN Peers Included/ Maximum) | 2/750 |
Concurrent Connections | 280,000 |
New Connections/ Second | 12,000 |
Integrated Network Ports | 4 Gigabit Ethernet, 1 Fast Ethernet |
Virtual Interfaces (VLANs) | 150 |
Security Contexts (Included/ Maximum) | 2/20 |
High Availability | Active/Active and Active/ Standby |
Expansion Slot | 1, SSM |
User-Accessible Flash Slot | 1 |
USB 2.0 Ports | 2 |
Serial Ports | 2 RJ-45, console and auxiliary |
Rack-Mountable | Yes |
Wall-Mountable | Not Available |
Security Lock Slot (for Physical Security) | Not Available |
Memory | 512 MB |
Minimum System Flash | 64 MB |
System Bus | Multibus architecture |
Form Factor | Desktop |
Dimensions (H x W x D) | 1.75 x 7.89 x 6.87 in. (4.45 x 20.04 x 17.45 cm) |
Weight (with Power Supply) | 20.0 lb (9.07 kg) |
Safety | UL 60950, CSA C22.2 No. 60950, EN 60950 IEC 60950, AS/NZS60950 |
Electromagnetic Compatibility (EMC) | CE marking, FCC Part 15 Class B, AS/NZS CISPR22 Class B, VCCI Class B, EN55022 Class B, CISPR22 Class B, EN61000-3-2, EN61000-3-3 |
Industry Certifications | FIPS 140-2 Level 2. In process: Common Criteria EAL4+ US DoD Application-Level Firewall for Medium-Robustness Environments, and Common Criteria EAL4 for IPsec/SSL VPN |
ASA5520-BUN-K9 - Deployment Notes
This ASA5520-BUN-K9 security appliance is positioned for the throughput and VPN requirements of its specific SKU tier. Confirm the firewall throughput, VPN tunnel capacity, and interface configuration of this variant against your expected traffic profile before ordering.
For refresh or migration projects, verify the software version and license entitlements applicable to this unit. Our team can confirm the installed software and hardware revision before dispatch.
Every ASA5520-BUN-K9 unit at LinkNewNet is inspected and tested before dispatch, and stock is graded, cleaned and verified for correct operation, including interface status, console access and firmware state.
