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In this tutorial we will learn in detail how Spanning Tree Protocol (STP) elect root port after choosing a root bridge. Root port is the port that is closest to the root bridge, which means it is the port that receiving the lowest-cost BPDU from the root.

Posted: Monday Jun 29, 2020

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Posted: (14 days ago) In this tutorial we will learn in detail how Spanning Tree Protocol (STP) elect root port after choosing a root bridge. Root port is the port that is closest to the root bridge, which means it is the port that receiving the lowest-cost BPDU from the root.

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CCNA Training » OSPF Tutorial

Posted: (4 days ago) OSPF Tutorial. December 3rd, 2010 Go to comments. For example, R1 wants to find out if it has any neighbor running OSPF it sends a Hello message to the multicast address 224.0.0.5. This is the multicast address for all OSPF routers and all routers running OSPF will proceed this message.

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CCNA Training » JSON Tutorial

Posted: (18 days ago) JSON Tutorial. May 20th, 2020 Go to comments. JavaScript Object Notation (JSON) is a human readable and very popular format used by web services, programming languages (including Python) and APIs to read/write data. JSON is also a subject of the CCNA 200-301 so in this article we will learn some basic knowledge of JSON and how to use Python to ...

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CCNA Training » Basic MPLS Tutorial

Posted: (9 days ago) Basic MPLS Tutorial. February 23rd, 2018 Go to comments. MPLS is a new forwarding mechanism called “label switching” in which packets are forwarded based on labels. However, hosts are unaware about labeled packets so routers will need to add a label when entering “MPLS area” and remove that label after leaving there.

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CCNA Training » NetFlow Tutorial

Posted: (4 days ago) NetFlow Tutorial. May 13th, 2016 Go to comments. Note: NetFlow is no longer a topic in CCNAv3 200-125 exam. One of the most important tasks of a network administrator is to monitor the health of our networks, learn how our bandwidth is being used, what applications are consuming it, when it needs upgrade… Although monitoring protocols like ...

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Simple Network Management Protocol SNMP Tutorial

Posted: (8 days ago) SNMPv1 is the original version and is very legacy so it should not be used in our network. SNMPv2c updated the original protocol and offered some enhancements. One of the noticeable enhancement is the introduction of INFORM and GETBULK messages which will be explain later in this tutorial.

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CCNA Training » TCP and UDP Tutorial

Posted: (4 days ago) The key difference between TCP and UDP is that TCP provides a wide variety of services to applications, whereas UDP does not. At the result of this, TCP is much more complex than UDP so this tutorial is dedicated to explore TCP in detail but we still compare them.

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CCNA Training » Hot Standby Router Protocol HSRP Tutorial

Posted: (5 days ago) In this tutorial we will learn what is HSRP and the need of HSRP in a network. Most of the company in the world has a connection to the Internet. The picture below shows a most simple topology of such a company: To make above topology work we need to: + Configure IP addresses on two interfaces of the Router.

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CCNA Training » TCP and UDP Tutorial

Posted: (5 days ago) Finally we show the TCP and UDP header in detail for your reference. There are some fields which are out of scope of this tutorial. TCP Header (20 bytes) Notice about the FLAG fields (between the “Reserved” and “Window Size” fields). If SYN bit is turned on, it is a SYN message. If ACK bit is turned on, it is an ACK message.

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CCNA Training » OSPF Tutorial

Posted: (8 days ago) OSPF Tutorial. December 3rd, 2010 Go to comments. In this article we will learn about the OSPF Routing Protocol. Open-Shortest-Path-First (OSPF) is the most widely used interior gateway protocol routing protocol on the world because it is a public (non-proprietary) routing protocol while its biggest rival, EIGRP, is a Cisco proprietary protocol ...

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