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• Cisco CCNA practice test: Try these 20 exam questions

  Use this CCNA practice test as study material to prepare for the Cisco CCNA Routing and Switching 200-125 exam. With 20 questions on a range of topics, we're not playing around. Continue Reading

• Try a CCNA 200-301 practice quiz from the official cert guide

  This practice quiz provides a sneak peek into the new 'CCNA 200-301 Official Cert Guide, Volume 1,' which reflects Cisco's CCNA certification and exam redesigns. Continue Reading

• Prepare for the CCNA 200-301 exam with this guide preview

  Here's a sneak peek at what to expect from Cisco's redesigned CCNA exam directly from 'CCNA 200-301 Official Cert Guide, Volume 1' by author Wendell Odom. Continue Reading

• UDP (User Datagram Protocol)

  UDP (User Datagram Protocol) is an alternative communications protocol to Transmission Control Protocol (TCP) used primarily for establishing low-latency and loss-tolerating connections between applications on the internet. Continue Reading

• URL (Uniform Resource Locator)

  A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the internet. It is also referred to as a web address. Continue Reading

• Definitions to Get Started

  • 5G
  • WAN optimization (WAN acceleration)
  • SD-WAN (Software-defined WAN)
  • edge router

  • computer network
  • Multiprotocol Label Switching (MPLS)
  • Asynchronous
  • bandwidth

  View All Definitions

• Bridge vs. switch comparison: What's the difference?

  A network bridge connects two local area networks. A network switch, on the other hand, connects multiple clients to a network. Learn more about these two network components.Continue Reading

• IPv6 (Internet Protocol Version 6)

  IPv6 is a set of specifications from the Internet Engineering Task Force that improves IPv4 by extending IP addresses from 32 bits to 128 bits.Continue Reading

• fiber optics (optical fiber)

  Fiber optics, or optical fiber, refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic strand or fiber.Continue Reading

• Learn how to get started with your networking career

  Wherever you are on your networking career path, these expert insights can help you decide where to go and give advice about job requirements, certifications and industry changes.Continue Reading

• Discover the wireless certifications that matter

  Find out which wireless certifications are worth pursuing with this expert advice that dives into vendor-specific, vendor-neutral and specialized certification options.Continue Reading

• Network pros on new Cisco DevNet certification: 'Finally!'

  Want to learn infrastructure as code? Now, there's a Cisco cert for that. Learn more about the new network automation certification suite, plus changes to the CCNA, CCNP and CCIE.Continue Reading

• What is the difference between SDN and NFV?

  SDN and NFV are siblings but not twins -- while they have a lot in common, they aren't identical. Here's what you need to know about their differences.Continue Reading

• nslookup

  nslookup is the name of a program that lets an Internet server administrator or any computer user enter a host name (for example, "whatis.com") and find out the corresponding IP address or domain name system (DNS) record.Continue Reading

• What is Citizens Broadband Radio Service?

  Citizens Broadband Radio Service gives enterprises another tool to manage the performance of their Wi-Fi and 5G networks. How does CBRS work?Continue Reading

• VPN (virtual private network)

  A virtual private network (VPN) is programming that creates a safe, encrypted connection over a less secure network, such as the public internet. A VPN uses tunneling protocols to encrypt data at the sending end and decrypt it at the receiving end.Continue Reading