Full English Description for Cisco ASA5508-X-K9
1. Official Short Order Description
Cisco ASA5508-X-K9: 1RU rack-mount mid-entry next-generation Adaptive Security Appliance (NGFW) from Cisco ASA 5500-X branch series, factory preloaded permanent Security Plus K9 unrestricted license with integrated FirePOWER threat defense hardware. Equipped with 8 fixed 10/100/1000 Gigabit copper data ports, dedicated out-of-band Gigabit management port, single AC power supply, running ASA OS up to final supported release 9.16. Built on Cisco Adaptive Security Algorithm, it delivers wire-speed stateful SPI firewall, full hardware-accelerated DES/3DES/AES IKEv1/IKEv2 IPsec/DMVPN, AnyConnect SSL/DTLS remote access VPN, AVC application visibility & control, integrated NGIPS intrusion prevention, NAT/PAT, unified communications TLS proxy, VoIP fixup inspection, multi-context virtual firewalls, and dual-mode Active/Standby & Active/Active stateful failover high availability. Performance benchmarks: up to 1 Gbps cleartext stateful firewall throughput, 100,000 maximum concurrent TCP/UDP connections, 10,000 new connections per second, 175 Mbps full 3DES/AES VPN throughput, supporting 100 site-to-site IPsec tunnels, 100 remote access AnyConnect peers and 50 logical routed VLAN interfaces. K9 license unlocks unlimited TLS proxy sessions, full multi-context segmentation and complete HA clustering capabilities. Managed via serial console, embedded ASDM web GUI, Cisco Security Manager (CSM), Syslog and SNMPv3. End-of-Sale August 2, 2021, End-of-Support August 2, 2026; obsolete legacy hardware superseded by Firepower 1000 series rack-mount NGFWs, targeted at medium branch offices, multi-site retail chains and small enterprise perimeter securityCisco.
2. Complete Detailed Product Overview
Product Line Positioning
The Cisco ASA5508-X-K9 is the rack-mount upgraded successor to fanless ASA5506-X desktop models, positioned as mid-entry branch NGFW for medium-sized distributed organizations. It delivers higher throughput, more concurrent sessions and expanded VLAN capacity than ASA5506-X variants, with standard 19-inch 1RU rack form factor suitable for standard wiring closets and branch server racks. Differentiated from ASA5516-X by lower performance, fixed 8-port copper design and no expansion slots.
The K9 designation stands for factory pre-activated full Security Plus unrestricted license bundle, eliminating all DES-only crypto limits of ASA5508-X-K8 base SKUs, enabling maximum VLAN count, multi-context virtual firewalls, dual-mode stateful failover and unlimited TLS proxy capacity for unified communications inspection. The platform reached End-of-Sale August 2, 2021 and End-of-Support August 2, 2026; no new feature development or official security patches will be released post EoS, replaced by modern Firepower rack-mount security appliancesCisco.
Physical Hardware & Fixed-Port Rack-Mount Architecture
Form Factor & Mechanical Specifications
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Standard 1RU 19-inch rack-mount metal chassis, included rack mounting brackets, dimensions 4.37 × 43.69 × 28.67 cm, total weight 3 kg with AC power adapterCisco
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Single internal fan active cooling, typical acoustic noise 41.6 dBA, max 67.2 dBA, suitable for wiring closet environmentsCisco
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Single universal AC power supply (100–240V 50/60Hz), no redundant PSU support, steady-state 12V 3.0A, peak 12V 5.0A power drawCisco
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Front panel multi-color diagnostic LED array: Power, System Health, FirePOWER Services status, Failover status, Port Link/Activity indicators
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Integrated physical security lock slot for anti-tampering protection
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Hardware core: Single multi-core security processor, fixed 8 GB DDR4 system memory, 8 GB onboard system flash, 80 GB internal mSATA solid-state drive for ASA OS, FirePOWER rule databases, logs and configuration storage
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No modular I/O expansion slots, fully fixed port layout without upgradeable interface cards
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Single rear USB 2.0 Type-A port for external flash backup, firmware image upload and log offloading
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Environmental compliance: 0°C to +40°C operating temperature, 10%–90% non-condensing humidity, altitude up to 3048m; FCC Class A, CE, UL 60950-1, FIPS 140-2 Level 1 certified
Rear Panel Fixed Port Layout
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8 × Built-in 10/100/1000 Gigabit Ethernet Auto-MDI/MDIX RJ45 Copper Data Ports (GE0/0 – GE0/7)
Auto-crossover Gigabit ports configurable for internal LAN, broadband WAN, guest DMZ and segmented department subnets
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1 × Dedicated 10/100/1000 Gigabit Ethernet Out-of-Band Management Port (Management0/0)
Fully isolated management interface separated from production data plane for secure device administration, shared for FirePOWER management traffic
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Dual Console Interfaces: RJ45 RS-232 Serial Console + Mini USB Console Port
Dual console access for initial bootstrap, password recovery and offline bulk configuration editing
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Single USB 2.0 storage port, recessed hardware factory reset pushbutton
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AC power input socket for integrated internal power supply
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DB-15 dedicated inter-chassis stateful failover serial port for redundant firewall pair session synchronization
Core Performance & K9 Security Plus Full License Capabilities
Throughput & Connection Benchmarks (Official Cisco Datasheet Specs)
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Maximum cleartext stateful firewall throughput: 1 Gbps
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Multiprotocol real-world HTTP throughput: 500 Mbps
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Maximum concurrent TCP/UDP connection table entries: 100,000 (20,000 hard cap on K8 base license)
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Maximum new connections per second: 10,000
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64-byte small packet forwarding rate: 694,000 packets per second
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Hardware-accelerated 3DES/AES IPsec VPN throughput: 175 Mbps
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AVC application control throughput: 450 Mbps
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Combined AVC + NGIPS threat defense throughput: 250 Mbps
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Maximum simultaneous IPsec IKE security associations: 100 site-to-site tunnels + 100 AnyConnect remote access VPN peers
Exclusive K9 License Advantages vs ASA5508-X-K8 DES Base License
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Encryption suite: Full native DES, 3DES-168, AES-128/AES-192/AES-256 strong enterprise-grade encryption (K8 locked to DES weak crypto only)
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Logical routed VLAN interfaces: Up to 50 independent security zones (5 VLAN hard limit on K8)
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TLS proxy sessions for encrypted SIP/SCCP unified communications inspection: Unlimited chassis-wide capacity (1000 hard cap on K8)
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High Availability: Supports both stateless Active/Standby and load-balanced Active/Active inter-chassis failover (HA fully disabled on K8 base license)
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Multi-context virtual firewalls: Up to 5 isolated independent virtual security contexts (disabled on K8 DES license)
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Native multi-device VPN clustering and load balancing fully enabled for centralized branch remote access aggregation
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AnyConnect Premium SSL/DTLS remote access: 2 permanent base seats, expandable via separate AnyConnect Plus/Apex subscription licenses
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Internal LAN host endpoints: Unlimited, no hard-coded user count throttling
Full Integrated Security & Networking Feature Suite (ASA OS 8.x / 9.16 Final Supported Release)
1. Stateful Adaptive Security Algorithm Firewall
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Wire-speed full stateful packet inspection tracking all TCP/UDP connection states to eliminate stateless filter bypass risks
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Object-group based inbound/outbound ACLs for granular multi-segment traffic permission/denial rule management
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Multi-layer enterprise-grade DoS/DDoS mitigation: SYN flood suppression, port scan detection, full TCP normalization, malformed packet filtering, IP source spoof suppression
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Layer 7 protocol fixup inspection engines for FTP, H.323, SIP, SCCP Skinny, RTSP, NetBIOS to maintain NAT traversal for VoIP and multimedia business workloads
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Native Transparent Layer 2 firewall mode for inline branch security deployment without LAN IP re-addressing
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Embedded FirePOWER Next-Generation IPS (NGIPS) with application visibility & control (AVC), URL category filtering, malware detection, intrusion prevention and threat correlation, no separate expansion blades required
2. Standards-Based Multi-Protocol VPN Suite
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Site-to-site LAN-to-LAN IPsec tunnels for secure inter-branch private backbone connectivity over public broadband internet
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Legacy IPsec remote access VPN compatibility for older Cisco VPN Client deployments
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Clientless SSL VPN + AnyConnect Premium SSL/DTLS remote access for browser and full-client global mobile workforce connectivity
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Dual IKEv1/IKEv2 key exchange protocol support, full X.509 digital certificate enrollment via SCEP for scalable multi-branch enterprise deployments
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GRE tunnel encapsulation for routed non-IPsec traffic across distributed VPN fabrics
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Dedicated on-board hardware crypto acceleration to eliminate CPU bottlenecks for 100 concurrent IPsec tunnels
3. Branch Routing & NAT Services
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Static one-to-one NAT, dynamic NAT pools, PAT port address translation for multi-user shared public IP addressing
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Native PPPoE client support for small/medium branch broadband ISP aggregation
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Local DHCP server supporting up to 1024 internal IP address leases for wired LAN endpoints
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Static routing, policy-based routing (PBR), BGP, OSPF, EIGRP dynamic interior routing protocol support
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Dual-stack IPv4 primary architecture with limited partial IPv6 functionality available on ASA OS 9.x releases
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Persistent local DNS caching to reduce external DNS lookup latency and WAN bandwidth consumption
4. Unified Threat Defense Security Stack
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Integrated signature-based NGIPS engine with thousands of exploit, worm and brute-force attack detection signatures; inline threat inspection without external IPS appliances
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Automatic dynamic host blacklisting to quarantine malicious source IP addresses after detected security breaches
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Unicast Reverse Path Forwarding (URPF) strict/loose anti-spoof filtering to block forged source IP traffic in multi-department branch environments
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Persistent local SSD event logging + remote Syslog export to centralized enterprise SIEM platforms for regulatory compliance audit trails
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Encrypted administrative access only: SSHv2 remote CLI, HTTPS ASDM web GUI, encrypted SNMPv3 secure device monitoring
5. AAA Access Control & Audit Logging
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Complete AAA authentication, authorization and accounting via external RADIUS and TACACS+ servers for segregated branch administrative privilege control
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Local user credential database for standalone emergency device login
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Comprehensive logging architecture supporting buffered flash storage, USB flash log offloading and remote Syslog archival
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SNMPv3 secure monitoring for real-time device health, throughput utilization, PSU/fan fault, VPN tunnel status and FirePOWER threat statistics alert reporting
6. Application-Aware Hierarchical QoS & Bandwidth Management
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Four-level priority queuing to prioritize real-time voice/video unified communications over streaming media, SaaS applications and P2P file-sharing traffic
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Per-port bandwidth shaping and policing applied to all Gigabit copper WAN/LAN/DMZ interfaces to eliminate branch network congestion
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DSCP marking preservation across IPsec and SSL VPN tunnels for consistent end-to-end enterprise branch QoS policy enforcement
Management & Configuration Tools
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ASA CLI Console: Full IOS-style command-line interface via serial console or encrypted SSHv2 remote access for bulk scripting and advanced branch troubleshooting
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Adaptive Security Device Manager (ASDM): Embedded HTTPS graphical web GUI for single-chassis visual configuration, real-time traffic dashboards, VPN tunnel monitoring and unified security event reporting
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Cisco Security Manager (CSM): Centralized enterprise policy management platform for bulk multi-branch ASA deployment orchestration, mass firmware upgrades and cross-device compliance audit reporting
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TFTP + USB flash dual methods for OS firmware and full configuration backup/restore; offline config editing supported
Key Differentiators vs Related ASA 5500-X Platforms
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vs ASA5508-X-K8 Base DES License:
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Full unrestricted 3DES/AES strong encryption suite (K8 limited to DES weak crypto)
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100,000 concurrent sessions vs K8’s 20,000 hard cap, 50 VLANs vs 5 VLAN limit
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Enables multi-context virtual firewalls and dual-mode Active/Standby + Active/Active stateful failover (K8 lacks both enterprise-grade HA features)
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vs ASA5506-X-K9 Fanless Desktop Model: 1RU rack-mount design, active cooling, higher 1 Gbps firewall throughput (750 Mbps on 5506-X), double 100,000 concurrent sessions (50,000 on 5506-X), 50 VLANs vs 30 VLAN capacity, no built-in wireless or industrial rugged variants
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vs ASA5506W-X-K9 Wireless Model: No embedded internal Wi-Fi AP hardware, pure wired rack-mount security design, higher performance and larger session scale
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vs ASA5506H-X-K9 Hardened Industrial Model: Standard 0–40°C office temperature range (no wide industrial -20~60°C rating), 8 copper ports vs 4 ports on 5506H-X, no IEC 61850 substation certification
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vs ASA5516-X-K9 Higher Tier Rack Model: Lower 1 Gbps throughput (1.8 Gbps on 5516-X), smaller 100,000 concurrent sessions (200,000 on 5516-X), fixed 8-port copper without optional fiber expansion slots
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vs Legacy ASA5505 Fixed-Port Firewall: Modern ASA 5500-X architecture with integrated FirePOWER NGIPS, native full Gigabit copper ports, higher throughput, AnyConnect SSL VPN support and multi-context virtualization unavailable on older ASA5505 hardware
Typical Enterprise Deployment Scenarios
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Medium enterprise headquarters internet edge security firewall isolating corporate LAN, guest DMZ and broadband WAN, supporting up to 100 concurrent remote AnyConnect teleworkers
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Multi-site retail regional branch security gateway with site-to-site IPsec VPN backhaul to corporate central data center
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Small MSP multi-tenant colocation boundary security appliance with independent multi-context virtual firewall segmentation for separated customer network traffic
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Redundant Active/Active chassis pair for medium enterprise load-balanced perimeter security and zero-traffic-loss disaster recovery continuity
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Mid-tier network lab training platform for ASA stateful firewall, FirePOWER NGIPS application control, multi-context virtualization and medium-scale branch VPN configuration learning
3. E-commerce Short Marketing Description
Cisco ASA5508-X-K9 Mid-Tier 1RU Rack-Mount Gigabit Next-Generation Adaptive Security Appliance, legacy ASA 5500-X series Security Plus unrestricted K9 firewall with eight built-in 10/100/1000 Gigabit copper ports, dedicated out-of-band Gigabit management port, integrated FirePOWER NGIPS threat defense, single AC internal power supply, running ASA OS up to final supported 9.16 firmware. K9 bundle unlocks full DES/3DES/AES strong encryption, unlimited internal host capacity, stateful SPI firewall, IPsec site-to-site/AnyConnect SSL remote access VPN, inline hardware NGIPS intrusion prevention, AVC application visibility & control, NAT/PAT, PPPoE broadband client, VoIP unified communications TLS proxy inspection, multi-context virtual firewalls and dual Active/Standby/Active/Active stateful failover with native multi-device VPN clustering. Up to 1 Gbps cleartext firewall throughput, 100,000 concurrent TCP/UDP sessions and 100 simultaneous IPsec VPN tunnels, managed via serial console, embedded ASDM web GUI and Cisco Security Manager. Obsolete end-of-support rack-mount NGFW for medium enterprise headquarters, regional multi-branch retail offices and mid-sized distributed business perimeter security deployments.
4. Product Catalog Keyword Tags
Cisco, ASA5508-X-K9, ASA 5500-X Series Mid-Tier Rack-Mount Next-Generation Firewall, Legacy Branch Stateful Inspection NGFW, 1RU 19-inch Rack-Mount Chassis, Single Internal AC Power Supply, Active Fan Cooling, 8 × 10/100/1000 Gigabit Copper Auto-MDI/MDIX RJ45 Ports, Dedicated Gigabit Out-of-Band Management 0/0 Port, Dual Console Ports (RJ45 Serial + Mini USB), Single USB 2.0 Storage Port, DB-15 Inter-Chassis Stateful Failover Serial Port, Single Multi-Core Security Processor, 8192 MB DDR4 SDRAM, 8 GB System Flash, 80 GB Internal mSATA Solid-State Drive, Cisco Adaptive Security Algorithm ASA, ASA OS 8.x / 9.16 Final Supported Firmware, Stateful Packet Inspection SPI, 1 Gbps Max Cleartext Firewall Throughput, 500 Mbps Multiprotocol HTTP Throughput, 175 Mbps Hardware-Accelerated 3DES/AES VPN Throughput, AVC Application Control Throughput 450 Mbps, Combined AVC+NGIPS Threat Throughput 250 Mbps, IPsec IKEv1/IKEv2 Site-to-Site & AnyConnect SSL/DTLS Remote Access VPN, Full DES/3DES-AES Unrestricted Strong Encryption Suite, Integrated Built-In FirePOWER NGIPS Intrusion Prevention System, AVC Application Visibility & URL Malware Filtering, NAT PAT Static Dynamic Address Translation, PPPoE DSL Broadband Client, VoIP H.323 SIP SCCP Skinny Fixup Protocol Inspection, Transparent Layer 2 Firewall Mode, Multi-Context Virtual Firewall Segmentation (Up to 5 Independent Contexts), Active/Standby & Active/Active Dual-Mode Stateful Failover Redundancy, Native Multi-Device VPN Clustering & Load Balancing, 50 Logical Routed VLAN Maximum (Security Plus K9 License), 100 Max Simultaneous IPsec VPN Peers, Unlimited TLS Proxy UC Sessions, 100,000 Concurrent TCP/UDP Connections, ASDM Adaptive Security Device Manager Embedded Web GUI, Cisco Security Manager CSM Centralized Multi-Branch Policy Orchestration, Syslog SNMPv3 Secure Monitoring, Dual-Stack IPv4 / Limited IPv6 Native Support, Application-Aware Hierarchical QoS Scheduling, FIPS 140-2 Level 1 FCC Class A Office Certified, End-of-Sale Aug 2 2021 End-of-Support Aug 2 2026 Obsolete Legacy Hardware, Security Plus K9 Unrestricted Upgrade Over ASA5508-X-K8 DES Base License, Predecessor to Firepower 1000 Series Rack-Mount Next-Generation Firewall Series, Medium Enterprise Headquarters Internet Edge Security Gateway, Regional Multi-Retail Branch IPsec VPN Backhaul Rack NGFW, Mid-Size MSP Multi-Tenant Colocation Boundary Modular Firewall
Naming Rule Explanation
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ASA: Adaptive Security Appliance, Cisco unified firewall product family integrating stateful firewall, VPN and embedded FirePOWER next-generation IPS threat defense services
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5508-X: Mid-entry rack-mount model within the legacy ASA 5500-X branch next-generation firewall series; fixed 8-port copper design, 1RU rack form factor, differentiated from fanless desktop 5506-X variants
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K9: Premium unrestricted Security Plus license identifier unlocking full 3DES/AES strong encryption, expanded concurrent session/VLAN capacity, unlimited TLS proxy sessions, multi-context virtual firewalls and dual-mode Active/Standby + Active/Active stateful failover; contrasted with K8 base DES-only restricted license
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Hardware Distinction Note: The ASA5508-X-K9 is the first rack-mount model in the low-end ASA 5500-X lineup, delivering higher performance than all 5506-X variants while retaining fixed non-modular port design without fiber expansion slots. All ASA5508-X hardware is fully legacy end-of-sale hardware with no new Cisco firmware feature development available.
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