CCNA

Whether you are an experienced network engineer, or an enthusiast at the beginning of your networking career, I am sure that you have thought at least once about how it would be beneficial to pass one or more of the prestigious Cisco certification exams. Besides your ambition and decision to certify, …

As you probably know, access control lists (ACLs in further text) are a means of providing firewall protection. Except the basic division on standard and extended ACLs, we distinguish between time-based, reflexive ACLs, turbo ACLs, and many other. The focus of this article are time-based ACLs, when should you use …

If you have ever experienced the ROMmon mode problem, you probably came across one of the following: configuration register forced the router to go to ROMmon mode during the boot process corrupt image (IOS) on Flash (indicated by bad_checksum message) router was unable to find the IOS (either on Flash …

Defining an access control list may seem a challenging and complex task, especially to those that have just delved into the world of computer networking and network security. The aim of this article is to explain the role of access control lists and basic concepts used to understand them. The …

Cisco Press has published several great books that cover the topics of the CCNA and CCENT in much detail.These books provide value to anyone looking to pass the exam, mainly because of the way they are structured. Cisco Press has designed the study books for those who have no experience …

Notes: SNMP is an application layer protocol that provides a message format for communication between SNMP managers and agents. Information stored in the management information base (MIB) Cisco Prime is a SNMP manager Messages that send data are Get Messages Messages that write data are Set Messages SNMP traps are …

VLANs are virtual LANs that is used to segregate broadcast domains in a layer 2 domain. Logically, VLANs allows you to setup multiple switches in a same physical switch. VLANs are used to isolate different types of traffic in IP networks like voice, data, management, web, and so on. Similarly, …

First Hop Redundancy Protocols (a.k.a. FHRP) are used to allow gateway redundancy. In this article, we cover the basics of this technology, with practical examples of configurations. I’m amazed at how the approach of the CCNA certification has changed since the time I took my test and entered the Cisco world …

Well it seems like it’s that time again.  The time when Cisco starts to change up their certification exams and requirements.  This seems to happen every several years or so where Cisco, in an effort to keep up with the changing technologies of computer networks, revamps their certification exams. This time Cisco has announced they …

Network Routing Protocols – IGRP, EIGRP, OSPF, ISIS, BGP The purpose of routing protocols is to learn of available routes that exist on the enterprise network, build routing tables and make routing decisions. Some of the most common routing protocols include RIP, IGRP, EIGRP, OSPF, IS-IS and BGP. There are …