Cisco C1921-3G-S-K9 2 Port Networking Router
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C1921-3G-S-K9 Cisco 1921 2 Ports Integrated Services Router New

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Part Number#: C1921-3G-S-K9
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Short Description:
C1921-3G-S-K9 1921 Integrated Services Router 2 Ports - Management Port - PoE Ports - 2 Slots - Gigabit Ethernet - 1U - Rack-mountable, Wall Mountable | Made by Cisco | New Factory Sealed | Lead Time Required
Product Condition:
New Retail Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days

Troubleshooting and Maintenance for Services Router

The Cisco 1921 2 Ports Integrated Services Router (C1921-3G-S-K9) is a reliable router, but as with any network device, it may experience issues or require maintenance from time to time. Some best practices and techniques for troubleshooting and maintaining the router are:


  • Check the router's LEDs: The router's LEDs can provide important information about the status of the router and can be used to identify and troubleshoot issues.
  • Check the router's logs: The router's logs can provide information about any issues that have occurred on the router and can be used to troubleshoot problems.
  • Use the Cisco IOS troubleshooting commands: The router runs on Cisco IOS software, which includes a variety of troubleshooting commands that can be used to diagnose and fix problems.
  • Check the network connectivity: Check the connectivity of the devices connected to the router.


  • Keep the router's software up-to-date: The router's software should be updated to the latest version to ensure that it has the latest security patches and features.
  • Back up the router's configuration: It's important to back up the router's configuration regularly, in case it needs to be restored in case of failure.
  • Monitor the router's performance: Monitor the router's performance regularly to ensure that it's operating within normal parameters and to identify any potential issues.
  • Keep the router clean: Keep the router clean of dust and debris to ensure that it's operating efficiently.

It's important to note that the specific steps and commands to troubleshoot and maintain the router may vary depending on the specific software version and memory capacity installed on the router as well as the modules that are installed on the router. It's recommended to consult with Cisco documentation, or a Cisco certified professional, to ensure the best configuration and performance for the specific needs of the network.

Network and Security Features

The Cisco 1921 2 Ports Integrated Services Router (C1921-3G-S-K9) is designed to provide a range of network and security features for small to medium-sized businesses and enterprise branch offices. Some of the network and security features that may be included are:

  • Routing: The router can be configured to route traffic between different networks using protocols such as OSPF, EIGRP, and BGP.
  • Network Address Translation (NAT): This feature allows for the translation of private IP addresses to public IP addresses, allowing devices on a private network to access the internet.
  • VPN: This feature allows for secure remote access to the network by encrypting traffic as it traverses the public internet. This can be used to allow employees to access the network remotely or to connect branch office networks together securely.
  • Firewall: This feature can be used to block unwanted traffic and protect the network from external threats. The router's firewall can be configured to block specific types of traffic, such as incoming ICMP packets, and to allow only specific types of traffic, such as HTTP traffic to a web server.
  • Access Control Lists (ACLs): These are used to control access to specific network resources, such as servers or applications. ACLs can be used to block unwanted traffic, such as malware or DDoS attacks, and to ensure that only authorized users can access specific resources.
  • Intrusion Prevention System (IPS): This feature provides protection against a variety of network-based attacks by detecting and blocking malicious traffic.
  • Secure Shell (SSH): This feature provides a secure method for remotely accessing the router's command-line interface (CLI) using an encrypted connection.
  • Secure Sockets Layer (SSL): This feature provides a secure method for remotely accessing the router's web-based interface using an encrypted connection.

Powering and Mounting

The Cisco 1921 2 Ports Integrated Services Router (C1921-3G-S-K9) is designed to be a reliable and easy-to-use router, and as such, it includes features for powering and mounting the router. Some of the powering and mounting features of this router are:


  • Power supply: The router is powered by an external power supply, which is included with the router.
  • Power over Ethernet (PoE): The router may include PoE support, which allows the router to be powered over the Ethernet cable, eliminating the need for an external power supply.


  • Rack-mountable: The router can be mounted in a standard 19-inch rack, using the included rack-mounting hardware.
  • Wall-mountable: The router can also be mounted on a wall using the included wall-mounting hardware.

It's important to note that the specific features and capabilities of the powering and mounting features will depend on the specific model of the router. It's recommended to consult with Cisco documentation, or a Cisco certified professional, to ensure the best configuration and performance for the specific needs of the network.


  • Manufacturer Cisco Systems, Inc
  • MPN: C1921-3G-S-K9
  • Product Series 1900
  • Product Model 1921
  • Product Name 1921 Integrated Services Router
  • Product Type Router
  • SKU: C1921-3G-S-K9


  • Total Number of Ports 2
  • USB Yes
  • Management Port Yes
  • Number of Broadband (RJ-45) Ports 2

I/O Expansions

  • Number of Total Expansion Slots 2
  • Expansion Slot Type HWIC

Network & Communication

  • Network Technology 10/100/1000Base-T
  • Ethernet Technology Gigabit Ethernet
  • VoIP Supported No

Management & Protocols

  • Security Features-
  • IPSec
  • SSL
  • AAA
  • PKI
  • Content Filtering
  • L2TP v3
  • GRE


  • Standard Memory 512 MB
  • Maximum Memory 512 MB
  • Memory Technology DRAM
  • Flash Memory 256 MB

Power Description

  • PoE (RJ-45) Port Yes
  • Input Voltage 110 V AC
  • Input Voltage 220 V AC
  • Power Source Power Supply

Routers lead the line as the first line of network security in homes and offices. It prevents intrusion into a network while creating a firewall to provide the highest level of security on several network types. They are the best ways of keeping computer systems, network systems, and information contained in them safe from intrusion.

A router is designed to be more capable than several other network devices such as hubs or switches that can only carry out basic network functions. For instance, a hub only transfers data between network devices without analyzing or doing anything with those data. On the other hand, routers are able to analyze data sent between network devices. They can change the packaging of such data and send it over to a different network.

Routers are the perfect devices to share an internet connection between multiple computers in home networks. A router typically connects to the modem using a network cable. Router networking occurs via a WAN port or the internet. There are also wireless routers that connect to devices using different wireless standards.

Important Features

Multi-core Processor

The hardware inside these routers allows them to cope with several network use at the same time. Many of these routers come with dual-core and quad-core processors. These processor options allow them to handle lots of data more effectively. Users can use their Wi-Fi routers for activities such as video streaming, online gaming, data backups, and more. Even while carrying out those operations, the routers perform at the highest levels.

Multi-band options

Users will get routers that broadcast wireless signals over two frequencies (for dual-band) or more (for tri-band and others). These routers run at frequencies that can cover a wide expanse of area. They are not congested and are perfect for office buildings, homes, and large enterprises. Clients will find routers that emit their signals between 2.4 GHz and 5 GHz.

Built-in Security Features

These router networking devices also come with security features such as device quarantine, firmware updates, automatic updates, and more. The features allow them to provide network-level protection against attacks. With these features, cyber criminals will be unable to infiltrate home networks.

Types of Routers

There are several types of routers that users can benefit from. Some of them include:

  • Core Routers. These are the types used by Internet Service Providers. They are the fastest and most powerful types. They sit at the center of the internet and forward data through the main fiber Optics.
  • Wireless Routers. These work in a similar manner as a home or business LAN. However, they give room for better mobility for laptops, tablets, and other portable devices. These types offer transmission over short distances.
  • Enterprise Routers. These are the types employed by large companies. Organizations use enterprise routers to connect their networks to these core routers.
  • Branch Routers. These types connect an enterprise's remote offices to its Wide Area Network (WAN). They come with improved features such as wireless LAN management, time-division multiplexing, WAN acceleration, and more.
  • Edge Routers. These are the most commonly used types in homes and small businesses. They are low-capacity devices that connect to the public internet or private WAN, or external LAN.
  • Logical Routers. They function similarly to hardware to create several network routes.

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ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

What is not covered by our warranty?

The reason why our warranty does not cover any problem caused by the following conditions:

(a) misuse of hardware; accidental damage; carelessness product(s) damage; shock; temperature beyond the specification of any product; faulty installation; operation; modification of goods;

(b) any misuse outside the instructions in the user manual for any specific product;

(c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

What is the Manufacturer/Brand Warranty?

In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
Final Sale items are non-returnable/refundable in any situation. Any question? please ask our team before the shipment.

Important notes:

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Individual product warranty mentioned on each item product description page/detail page.

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