31 Days Before Your CCENT Certification (Cisco Networking by Scott Bennett
By Scott Bennett
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Sample text
Day 29 focuses on the protocols used in the OSI and TCP/IP layered models and the impact of some network applications on a network. You can further review the topics from today on pages 5–36 of CCNA Flash Cards and Exam Practice Pack (CCENT Exam 640-822 and CCNA Exams 640-816 and 640-802), Third Edition. 12 31 Days Before Your CCENT Certification Your Notes Day 29 Describe the Purpose and Basic Operation of the Protocols in the OSI and TCP Models From the physical standards for speed to the application requirements to request a web page, protocols standardize network communication.
2: Often the Internet is represented in a diagram as a cloud. This cloud represents the hierarchy of devices that connect you to other networks and the Internet. ISPs sit at the top of this hierarchy and connect to each other through Internet exchange points (IXP) or network access points (NAP). These IXPs and NAPs between ISPs provide the backbone for the Internet. ” This Internet backbone is typically connected with fiber-optic cable installed underground and even undersea. The connections between continents are handled by tier 1 ISPs.
This Internet backbone is typically connected with fiber-optic cable installed underground and even undersea. The connections between continents are handled by tier 1 ISPs. The intermediary connections between countries are classified as tier 2 ISPs. Finally, connections between major cities are classified as tier 3 ISPs. 3: Software applications can aid you in your visualization of connections and speeds possible over the Internet. Entering the following commands in the Cisco command-line interface (CLI) can help you test the connectivity in a network: ■ The ping command allows you to send an echo request and receive an echo reply to test connectivity.