The Cisco 1721 is a compact, standalone modular access router from Cisco’s 1700 Series, designed for branch-office, small-business, and remote-access networking. It provides a fixed 10/100BASE-TX Ethernet LAN interface and two WIC slots for modular WAN connectivity.
The router supports Cisco IOS routing, security, NAT, VPN, and remote-access features. Its modular architecture allows WAN interfaces to be selected according to the deployment, including serial and ISDN options. The exact WAN interfaces, memory, IOS feature set, and installed modules depend on the individual unit.
Key Features
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Manufacturer: Cisco Systems
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Part Number / Model: 1721
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Product Type: Modular Access Router
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Product Family: Cisco 1700 Series
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Fixed LAN Interface: 1 × 10/100BASE-TX Fast Ethernet
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WAN Expansion: 2 × WIC slots
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Management: Console and auxiliary ports; Cisco IOS CLI
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Routing: IP routing and WAN connectivity
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Security: VPN, IPSec, and encryption capabilities depending on installed hardware and IOS
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Chassis: Standalone desktop-style router
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Power: External AC power supply
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PoE: No
Technical Specs
Interfaces and Expansion
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1 × fixed 10/100BASE-TX Ethernet port
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2 × WIC slots for modular WAN interface cards
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1 × RJ-45 console port
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1 × RJ-45 auxiliary port
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WAN connectivity depends on the installed WIC, which may provide serial, ISDN BRI, or other supported interfaces
Routing and Network Functions
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Cisco IOS-based routing platform
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IP routing and WAN access
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Frame Relay, leased-line, and dial-backup applications depending on installed interfaces and software
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NAT, firewall, VPN, and remote-access features supported by the installed IOS release and configuration
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IPSec, L2F, and L2TP support for VPN and tunneling applications
