Category Archives: Fundementals

CCNA ICND 2: Spanning Tree Protocol Introduction

cisco-logo-transparent-backgroundThis is the first in a series of posts on Spanning tree, in this post I will be describing the need for Spanning Tree Protocol (STP) in modern LAN environments.  I will be concentrating on the main topics covered in the CCNA ICND 2 exam. Continue reading CCNA ICND 2: Spanning Tree Protocol Introduction


CCNA ICND 2: How a switch forwards frames

cisco-logo-transparent-backgroundWell its a new year and that means New Year resolutions and that its time I get off my butt and finish my CCNA. I will be writing my ICND 2 exam at the end of January so expect quite a few
posts on the topics covered in the ICND 2.

The first of these topics is a review of how a switch forwards a frame through the network.  This is one of the fundamental topics covered in the ICND 1 exam, however if you do not have a clear understanding of the logic then you will find the topics covered in the ICND 2 exam, and in everyday trouble shooting, very difficult to grasp. Continue reading CCNA ICND 2: How a switch forwards frames

TFTP on Ubuntu 14.04 LTS server

ubuntu-logo32In this post I will run through the installation and verification of operation of a Trivial File Transfer Protocol (TFTP) server running on Ubuntu 14.04 LTS. TFTP is an Internet software utility for transferring files between networked devices, that is simpler to use than the File Transfer Protocol (FTP) but less capable and less secure. It is used where user authentication and directory visibility are not required. TFTP uses the UDP port 69 as its transmission layer protocol making it lighter than TCP based FTP. TFTP is described formally in RFC 1350. Continue reading TFTP on Ubuntu 14.04 LTS server

Linux IP Subnetting Tools

unnamedIP subnetting is one of the core topics that is covered in the CCNA and is something that every network engineer worth his/her salt will be able to do in their head. Having said that though, there are times when you just cant be bothered to do it in your head, we are human after all and by default lazy. Continue reading Linux IP Subnetting Tools

Fundamentals: DHCP

ietfEvery device that wants to communicate on a network requires an IP address, subnet mask, default gateway and DNS server details. There are two methods to configure an IP address information on a Host:

  1. Statically (manually), this is typically reserved for mission critical servers and network devices (routers and switches).
  2. Dynamically, this is typically used for hosts that do not care if their IP changes periodically.

Continue reading Fundamentals: DHCP