Network Layer [rss]

PodSnacks: Link State Database (LSDB)

Posted Tuesday, April 29, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q2/lsdb.mp3
Enough of the basics! For today, we're going to give the more technically oriented members of our audience a little something to chew on. Our topic today comes from the world of routing , specifically, OSPF . We're going to talk about a construct Read More...

PodSnacks: The Chained Layers

Posted Thursday, April 24, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q2/chained_layers.mp3
Back to the OSI Reference Model for a moment. You may sometimes hear reference to the chained_layers . This is a reference to the first three layers of the model, so named because chaining them together creates the fabric of an inter-network. In today's Read More...

PodSnack: The Routing Hierarchy

Posted Friday, April 11, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/routing_hierarchy.mp3
Recently, Michel and Trevor walked you through the routing-related concept of an administrative distance. At the conclusion, they made reference to routing hierarchies, and promised to cover it in another PodSnack. We'll, today's the day. Pull Read More...

PodSnacks: Administrative Distance (Routing)

Posted Wednesday, April 09, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/administrative_distance.mp3
Today we're going to spend a bit of time with a concept associated with routing and somewhat associated with routing protocols . The concept for today is administrative distance . To a router, an administrative distance is a measure of trust. If the Read More...

PodSnacks: NAT vs. NAPT

Posted Monday, March 24, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/nat-napt.mp3
Network Address Translation (NAT) and Network Address Port Translation (NAPT) can be confusing concepts, especially since most people are doing NAPT and calling it NAT. In today's PodSnack, Michel explains the concepts to you. You can listen to (or Read More...

PodSnacks: Addresses

Posted Friday, March 21, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/addressing.mp3
Sometimes we go for deeply technical topics. Sometimes we just go back to basics. Today is a back to basics day. In today's PodSnack, Dave takes you through the concept of addressing . You can listen to (or download) the PodSnack by clicking here Read More...

From IP over Everything to Everything over IP

Posted Wednesday, March 19, 2008 5:43 AM by mgilbert :: 0 Comments
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When the Internet Protocol (IP) was first created, the mantra was "IP over everything," a joke that took me 15 years to get! They even had T-shirts made up. After all, that was the Great Insight: if you wanted computers connected to different Read More...

PodSnacks: Routers vs. Layer 3 Switches

Posted Monday, March 17, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/layer-3-switch.mp3
The role of a router is relatively simple: it routes packets and operates at Layer 3 of the OSI Reference Model . This industry, however, is never content to leave anything simple. Enter the Layer 3 switch to muddy the waters. In today's PodSnack, Read More...

PodSnacks: Regional Internet Registry

Posted Tuesday, March 04, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q1/rir.mp3
It is very important that every device connected to the Internet have a unique address. If there is any address duplication, the network will become confused and packets will not get to their destination. To ensure this, a hierarchical addressing authority Read More...

PodSnacks: BGP and YouTube

Posted Thursday, February 28, 2008 6:00 AM by mgilbert :: 1 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q1/bgp_youtube.mp3
YouTube recently had an outage that was related to Pakistan. Sound a bit odd? It's also a good story to understand a little bit about routing in the Internet and how it can go wrong. Basically, in an effort to prevent Pakistanis from being able to Read More...

There's Delay, and Then There's Delay

Posted Monday, February 25, 2008 10:48 PM by mgilbert :: 0 Comments
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For almost the last two weeks I've been house-bound as I fight off a flu. My wife is having a marvelous time. She has a sick husband and two sick kids, all at the same time. Maybe that's why this article about two cruise lines caught my eye. Right Read More...

PodSnacks: Variable Length Subnet Mask (VLSM)

Posted Wednesday, February 20, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/vlsm.mp3
An exploration of the IP address and subnet masking , is not complete without a look at variable length subnet masking (VLSM). Michel explores the role of the mask in partitioning a network, and the flexibility introduced by being able to vary the length Read More...

PodSnacks: Store-and-Forward Switching

Posted Tuesday, February 19, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2008q1/sf_switch.mp3
Now let's go back to basics again. We've talked before about circuit switching but we haven't really talked about packet switching . The packet switch uses a different strategy for manipulating traffic: it uses a technique called store-and-forward Read More...

PodSnacks: Subnet Mask

Posted Monday, February 18, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/subnet_mask.mp3
We could spend weeks on the Internet Protocol (IP), and a fair amount of that time could be spent on the IP address itself. One of the more perplexing things about the way IP addresses operate is this concept of the subnet mask . In today's PodSnack, Read More...

PodSnacks: IP Addressing

Posted Friday, February 15, 2008 6:00 AM by mgilbert :: 0 Comments
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Attachment(s): http://podcast.hill-vt.com/podsnacks/2007q1/ip_address.mp3
Let's shift from the OSI Reference Model to a particular protocol suite: TCP/IP . There's lots of ground to be covered there, so we need a focus. We're going to narrow in on Layer 3, which is mostly about the Internet Protocol (IP), the packet Read More...
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