Category Archives: CCNA

Speeding Up a Slow Traceroute in IOS

This article is just a quick tip regarding the traceroute process on Cisco devices and how to it may be streamlined. To be honest, I had been somewhat annoyed by the typical slowness and had assumed DNS lookups to be … Continue reading

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Cisco Router — T1 Back-to-Back

For those studying for CCNA and CCNP certifications, a lab is an important part of the learning process. More and different types of interfaces are always a way to add complexity and challenge to a given topology. While standard serial … Continue reading

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Cisco Router — 56K Back-to-Back

Like connecting T1 cards directly, back-to-back 56K communication requires a special cable. Also like T1 crossover cables, anyone having bulk networking cable, some RJ45 connectors and a pair of crimpers can make this 56K crossover cable. The specific pinout is shown in the image … Continue reading

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Ping Connectivity Testing–Why Source Matters

The ping command is a pervasive troubleshooting tool used by network administrators and engineers. One important, but sometimes overlooked, detail is the source that is used by the traffic it creates. By default ping uses the IP address of the … Continue reading

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Thoughts on Cisco Learning Labs

For some time, I’ve been wanting to write an article about the product offering known as Cisco Learning Labs. My lack of familiarity of this offering has held me back from commenting in any significant way. A couple of weeks … Continue reading

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A Simplified Look at Proxy ARP

Most technicians learn about the process of mapping an IP address to a Mac address. This process, known as arp, is a layer 2 process that allows the Internet Protocol to function over Ethernet. What isn’t always well known and … Continue reading

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The Operation of Proxy Arp

In A Simplified View of Proxy Arp, we looked conceptually at the function of this layer two protocol. The use of the process, typically found in what many consider a broken network, raises some concerns and should typically be disabled. … Continue reading

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Understanding Routed and Routing Protocols

Those entering the networking field are bombarded with new terms, acronyms and concepts. Many concepts are obviously unique. Others seem to be ambiguous. At first, the concept of routing and routed protocol might seem to be overlapping. However, these are … Continue reading

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Frames are Fat, Packets are Tall

Sometimes odd things catch my attention. One thing that occurred to me is that packets are typically represented vertically, while frames are diagrammed horizontally. So if anyone ever asks about the differences between a frame and packet, you now have … Continue reading

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Introducing HSRP

A typical challenge that needs to be addressed in the access layer is that of providing a redundant default gateway. This is typically accomplished with something known as a First Hop Resolution Protocol, or FHRP. A common, but proprietary FHRP is the Hot Standby Router … Continue reading

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Disambiguating Discontiguous Networks

The concept of discontiguous networks is one that often causes some confusion for those new to networking. I think most of the confusion is because this concept it is often combined with the operation of classful routing protocols and the … Continue reading

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Cisco VIRL – The Virtual Internet Routing Lab

Cisco has been talking for some time about a product that I’m really excited about. This product is known as “VIRL”, pronounced like “viral”. VIRL is short for Virtual Internet Routing Lab. The promise is this will use IOU, short … Continue reading

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