640-911 (Chapter 4)

Continuing where we left off on Chapter 3 on CCNA Data Center Study Guide from Todd Lammle. Like before feel free to post questions below. In these post I am only going over the topics of each chapter of the book, plus any examples the book offers and to get an idea of what the Cisco exam would cover. In chapter three we discussed about Ethernet Technologies and in chapter four we will learn about the TCP/IP protocol which is fundamentally the protocol that makes the Internet work. Continue reading “640-911 (Chapter 4)”

Advertisements

Link-State Protocols

Weeks ago and maybe months :), I talked about distance vector protocols and with that you probably got the feeling that when using a distance vector protocol it does not give a full network graphical representation of the entire network. Only the directly connected routes can’t remember? Check out this post Distance Vector Routing. Link state protocols are faster to converge network changes compared to distance vector however when compared to distance vector setup they can be harder to set up, maintain, and troubleshoot when problems arise. Continue reading “Link-State Protocols”

The Codes of ICMP

In today’s post I wanted to talk about the widely used Ping command. Which is one of the best methods (I think) to begin network troubleshooting. When part of the network goes down it is sometimes hard to figure out why? When you issue the ping command or the extended ping command in a Cisco router several ICMP codes can come up on the router. Let’s discuss them! Continue reading “The Codes of ICMP”

The Beginnings of Layer Two Redundancy

In a perfect world we would never need redundancy on a network infrastructure, but as you know as well as I know we don’t live in a perfect world. Hardware will eventually fail, bottlenecks will appear, and the speed of our network will become slower when we max the bandwidth on links. So having redundancy in routers, connections, and having a hierarchy network is one of best choices to make when improving the efficiently of the network. But in the OSI model there is one layer that can’t have redundancy at least logically and that is Layer two of the OSI model. Continue reading “The Beginnings of Layer Two Redundancy”

Distance Vector Routing

Couple weeks ago I talked about routing protocols and in the post I mentioned two routing protocol features distance vector and link state. Although these protocols fundamentally do the same thing by getting information on remote networks they get this information in a different way. For today let’s introduce distance vector routing. Continue reading “Distance Vector Routing”