{"id":86293,"date":"2026-09-08T17:01:42","date_gmt":"2026-09-08T17:01:42","guid":{"rendered":"https:\/\/geektechsol.com\/index.php\/product\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\/"},"modified":"2026-09-08T17:02:07","modified_gmt":"2026-09-08T17:02:07","slug":"refurbished-isr4431-sec-k9-cisco-isr-4431-router","status":"publish","type":"product","link":"http:\/\/geektechsol.com\/index.php\/product\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\/","title":{"rendered":"Refurbished ISR4431-SEC\/K9, Cisco ISR 4431 Router"},"content":{"rendered":"<p>Refurbished ISR4431-SEC\/K9 Technical Specifications<\/p>\n<p>Cisco ISR 4431 Router \u2013 4 Ports \u2013 8 Slots \u2013 Rack-Mountable<\/p>\n<p>General Information:<\/p>\n<p>Manufacturer Cisco Systems, Inc<\/p>\n<p>Manufacturer Part Number ISR4431-SEC\/K9<\/p>\n<p>Brand Name Cisco<\/p>\n<p>Product Line Cisco ISR<\/p>\n<p>Product Series ISR 4000<\/p>\n<p>Product Model ISR4431<\/p>\n<p>Ethernet Technology: Gigabit Ethernet<\/p>\n<p>Product Name 4431 Router<\/p>\n<p>Product Type Router<\/p>\n<p>Interfaces\/Ports:<\/p>\n<p>Total Number of Ports 4<\/p>\n<p>USB Yes<\/p>\n<p>Powerline No<\/p>\n<p>Management Port Yes<\/p>\n<p>Token Ring Port No<\/p>\n<p>Number of Network (RJ-45) Ports 4<\/p>\n<p>I\/O Expansions:<\/p>\n<p>Number of Total Expansion Slots 8<\/p>\n<p>Expansion Slot Type-<\/p>\n<p>SFP<\/p>\n<p>Network Interface Module (NIM)<\/p>\n<p>Integrated Services Card (ISC)<\/p>\n<p>Network &#038; Communication:<\/p>\n<p>Network Technology 10\/100\/1000Base-T<\/p>\n<p>Ethernet Technology Gigabit Ethernet<\/p>\n<p>VoIP Supported Yes<\/p>\n<p>Memory:<\/p>\n<p>Standard Memory 4 GB<\/p>\n<p>Maximum Memory 16 GB<\/p>\n<p>Memory Technology DRAM<\/p>\n<p>Flash Memory 8 GB<\/p>\n<p>Power Description:<\/p>\n<p>PoE (RJ-45) Port No<\/p>\n<p>Input Voltage-<\/p>\n<p>120 V AC<\/p>\n<p>230 V AC<\/p>\n<p>Power Source-<\/p>\n<p>Power Supply<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Refurbished ISR4431-SEC\/K9 Overview<\/p>\n<p>The 4431 Integrated Services Router from Cisco offers a multicore CPU architecture running modular Cisco IOS XE Software that can be quickly adapted to the changing needs of your branch-office environment. It separates control, services, and data planes, providing application-aware network services while maintaining a stable platform and a high level of performance during periods of heavy network load. Additionally, the router is able to integrate application-aware services and scale performance without a complete equipment upgrade. The 4431 features encryption acceleration, voice- and video-capable architecture, application firewall, call processing, and embedded services. The platform supports a range of wired connectivity options, including T1\/E1 and fiber Gigabit Ethernet.<\/p>\n","protected":false},"featured_media":86294,"comment_status":"closed","ping_status":"open","template":"","meta":{"_acf_changed":false},"product_brand":[255],"product_cat":[691,347,626],"product_tag":[1036,1037,677,628,1052,1053],"class_list":["post-86293","product","type-product","status-publish","has-post-thumbnail","product_brand-cisco","product_cat-cisco-refurbished-routers","product_cat-refurbished","product_cat-refurbished-routers","product_tag-cisco-isr","product_tag-cisco-isr-4000-series","product_tag-gigabit-ethernet-servers","product_tag-router","product_tag-sfp-router","product_tag-voip-router","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Refurbished ISR4431-SEC\/K9, Cisco ISR 4431 Router - Geek Tech Sol<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/geektechsol.com\/index.php\/product\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Refurbished ISR4431-SEC\/K9, Cisco ISR 4431 Router - Geek Tech Sol\" \/>\n<meta property=\"og:description\" content=\"Refurbished ISR4431-SEC\/K9 Overview The 4431 Integrated Services Router from Cisco offers a multicore CPU architecture running modular Cisco IOS XE Software that can be quickly adapted to the changing needs of your branch-office environment. It separates control, services, and data planes, providing application-aware network services while maintaining a stable platform and a high level of performance during periods of heavy network load. Additionally, the router is able to integrate application-aware services and scale performance without a complete equipment upgrade. The 4431 features encryption acceleration, voice- and video-capable architecture, application firewall, call processing, and embedded services. The platform supports a range of wired connectivity options, including T1\/E1 and fiber Gigabit Ethernet.\" \/>\n<meta property=\"og:url\" content=\"http:\/\/geektechsol.com\/index.php\/product\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\/\" \/>\n<meta property=\"og:site_name\" content=\"Geek Tech Sol\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-08T17:02:07+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/geektechsol.com\/wp-content\/uploads\/2026\/09\/Refurbished-Cisco-ISR4431-SEC-K9.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/\",\"url\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/\",\"name\":\"Refurbished ISR4431-SEC\\\/K9, Cisco ISR 4431 Router - Geek Tech Sol\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/geektechsol.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/#primaryimage\"},\"image\":{\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/geektechsol.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/Refurbished-Cisco-ISR4431-SEC-K9.jpg\",\"datePublished\":\"2026-09-08T17:01:42+00:00\",\"dateModified\":\"2026-09-08T17:02:07+00:00\",\"breadcrumb\":{\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/#primaryimage\",\"url\":\"http:\\\/\\\/geektechsol.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/Refurbished-Cisco-ISR4431-SEC-K9.jpg\",\"contentUrl\":\"http:\\\/\\\/geektechsol.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/Refurbished-Cisco-ISR4431-SEC-K9.jpg\",\"width\":800,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/product\\\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"http:\\\/\\\/geektechsol.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"http:\\\/\\\/geektechsol.com\\\/index.php\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Refurbished ISR4431-SEC\\\/K9, Cisco ISR 4431 Router\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/geektechsol.com\\\/#website\",\"url\":\"https:\\\/\\\/geektechsol.com\\\/\",\"name\":\"Geek Tech Sol\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/geektechsol.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Refurbished ISR4431-SEC\/K9, Cisco ISR 4431 Router - Geek Tech Sol","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"http:\/\/geektechsol.com\/index.php\/product\/refurbished-isr4431-sec-k9-cisco-isr-4431-router\/","og_locale":"en_US","og_type":"article","og_title":"Refurbished ISR4431-SEC\/K9, Cisco ISR 4431 Router - Geek Tech Sol","og_description":"Refurbished ISR4431-SEC\/K9 Overview The 4431 Integrated Services Router from Cisco offers a multicore CPU architecture running modular Cisco IOS XE Software that can be quickly adapted to the changing needs of your branch-office environment. 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