Ethan Banks

After ICMP, we get into some of the protocols used so that hosts can find out about each other and about themselves. ARP – address resolution protocol, RFC 826. ARP is how a host who knows the IP address of his destination finds out the MAC so that he can properly put a frame on […]

I’m going to start breaking these up a bit more, as generally the chapters are broken up into major groups, and doing 1 or 2 part posts for each chapter is just way too much information in a single post. Without further ado, the glories of Official Exam Certification Guide, Chapter 5. ICMP – internet […]

subnet – some portion of a larger network. Subnets can be classful or classless. prefix – the portion of a classless IP network that comes before the host. Often noted with / notation, where the number following the slash represents the number of bits that makes up the subnet.

I’ve spent a few hours on the Cisco NetPro forums, and on the GroupStudy Cisco mailing list. For me, they aren’t helping. My level of knowledge is often somewhere above most of the people asking the questions, but usually somewhere below most of the people answering the questions. A lot of times, I’m pretty sure […]

And now on to IPv6, which was a pretty brief part of the chapter really, but I wanted to devote a page all to itself, since the last post was so long. IPv6 was designed to fix the Internet address space problem permanently. And amazingly enough, they managed to complicate things more than a lot. […]

This first part of this chapter gets into the binary nuts and bolts of IP addresses. One stress is on understanding IP addresses, classful vs. classless addresses, dotted quad notation, subnet masks, etc. The real focus is on being able to supernet, subnet and summarize routes in your head, and do it quickly. The author […]

At the end of Ch.4 in OECG, the author points to an IPv6-related link requiring a CCO login. I have a CCO login, but was still without luck, probably because the author’s link was for partners only. There is a different set of IPv6 documents to be found here, no CCO required.

I got through the first part of chapter 4 tonight. I killed pretty much the whole day working on cars and finances. Ick. I did some errands in the morning, went to the bank. Trying to get my taxes organized. Shredding all the credit card offers, and all that. Owed both cars oil changes, FINALLY […]