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OSPF Part IV - CCNA Blog
https://www.ccnablog.com/ospf-part-iv
Free CCENT and CCNA Training to pass your certification exam. Multi-access networks, are networks that consist of more than 2 devices sharing the same media. In the example shown below, the three routers and three PCs are interconnected using the two switches at the center of the topology. This means that the interfaces on the routers that connect to the switches as well as the PCs are in the same subnet. In OSPF, we can have 5 network types which are:. Challenges in OSPF Broadcast multi-access networks.
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OSPF Part I - CCNA Blog
https://www.ccnablog.com/ospf-part-1
Free CCENT and CCNA Training to pass your certification exam. Welcome to the world of OSPF (Open Shortest Path First) routing. This protocol was developed to replace RIP and it is a classless Link State routing protocol that uses areas so as to scale better. This chapter is divided into four parts since it is too broad. The concepts we will learn will be useful in not only the ICND 1, ICND 2 and CCNA composite exam but also in the real world. Link-state protocols work by calculating the cost along the pa...
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Addressing in ipv4 – part 2 - CCNA Blog
https://www.ccnablog.com/addressing-in-ipv4-part-2
Free CCENT and CCNA Training to pass your certification exam. Addressing in ipv4 part 2. Welcome to part 2 of addressing in ipv4. In part 1 we looked at how IP addresses are assigned in ipv4. We looked at the various types of ipv4 addresses and we also did basic subnetting. In part 2, we will continue subnetting and introduce a few more concepts. Classful addressing in ipv4. The table below shows the different classes in ipv4. Classless IPv4 addressing is a solution to the wastage of ip addresses occasio...
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Configuring and testing the network - CCNA Blog
https://www.ccnablog.com/configuring-and-testing-the-network
Free CCENT and CCNA Training to pass your certification exam. Configuring and testing the network. Upon completion of this chapter, you will be able to:. Understand the role of the CISCO IOS. Understand the config file on routers and switches. Understand the IOS command structure. Configure basic configuration of a router or a switch. Verify the configuration on a router using show commands. CISCO uses the IOS (internetwork operating system) to allow us to use the various capabilities in the routers.
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Network layer - CCNA Blog
https://www.ccnablog.com/network-layer
Free CCENT and CCNA Training to pass your certification exam. The network layer defines communication over the network through four basic processes which are addressing, routing, encapsulation and decapsulation. These concepts are vital in understanding routing. You may have sent a letter through the post office, while doing this, you are required to write the address of the recipient on the envelope and most likely your address for reply purposes. The network layer PDU- protocol Data Unit is the packet&...
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Dynamic routing protocols - CCNA Blog
https://www.ccnablog.com/dynamic-routing-protocols
Free CCENT and CCNA Training to pass your certification exam. In the previous chapter, we looked at static routing. We saw how the router finds the best path to a network. We configured static routes and traffic was able to flow between two points. Consider the network diagram shown below. The administrative overhead that would be needed to make communication between all these devices would be considerable. All the static routes would have to be configured. Definition of dynamic routing protocols. Routin...
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EIGRP part 1 - CCNA Blog
https://www.ccnablog.com/eigrp-part-1
Free CCENT and CCNA Training to pass your certification exam. Distance vector routing protocols. As we discovered from the previous chapter, Interior Gateway Protocols, can be classified into two; distance vector routing protocols and link-state routing protocols. In this section, we will explore distance vector routing protocols, these concepts will be crucial in understanding EIGRP. The direction or outbound interface. Distance or metric towards the destination. Periodic updates sent at regular interva...
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OSPF Part II - CCNA Blog
https://www.ccnablog.com/ospf-part-2
Free CCENT and CCNA Training to pass your certification exam. In the first part, we took a look at link state routing protocols and discussed how OSPF works. We also learnt how to configure OSPF. In part two of this chapter on OSPF, we will look at more concepts such as the OSPF metric, suppression of OSPF updates and redistributing the default route. The table below shows the different costs on various links that we can use in our networks. We can also modify the cost by using the “ ip ospf cost. 8221; ...
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TCP/IP and the OSI Model - CCNA Blog
https://www.ccnablog.com/tcpip-and-the-osi-model
Free CCENT and CCNA Training to pass your certification exam. TCP/IP and the OSI Model. In the previous chapter we were introduced to computer networks and we got to know their importance in everyday lives. In this chapter, we will look at the layered models that are used in communication over networks. We will discuss the TCP/ip model and the OSI model to better understand how communication works. This will lead into detailed discussion on each of the layers so as to better understand them. Competitions...
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