Cisco Hands On Training Podcast
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Cisco Hands On Training Podcast
A video podcast showing Cisco hands-on training exercises.
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IPv6 RIPng dynamic routing
The linked video demonstrates RIPng, our first dynamic routing protocol for IPv6. This is a simple but inefficient routing protocol. The metric is b...
IPv6 Static Routing
In this hands-on exercise, we configure IPv6 addresses on 3 routers in a triangle. Then we configure IPv6 static routes to allow the 6 IPv6 subnets (...
The need for QOS versus Net Neutrality
In 2003, I made a VOIP call from home while downloading a large email attachment. The DSL line saturated and my audio quality became horrible while V...
IPv6 theory
The linked video introduces IPv6 theory. IPv6 is the 128-bit address replacement for IPv4. The Internet is expected to run out of it's 4-billion IPv...
IOS Version Selection Tactics
The linked video provides guidance for optimal IOS version selection.
IOS Access Control Lists
In this video demonstration, we show an example of writing IOS Access Control Lists (ACL's) on a home router. We use the revision control system (RCS...
IOS DHCP and NAT
IOS routers can act as DHCP clients and DHCP servers. They can also function as Network Address Translation (NAT) devices. In this video we show a d...
Hot Standby Router Protocol
In this episode we show a video demonstration of the hot standby router protocol. This is a Cisco proprietary redundancy protocol. The purpose is to...
Rapid Spanning Tree 802.1w
This video demonstrates layer-2 convergence in less than 2 seconds thanks to rapid spanning-tree.
Etherchannels and the port aggregation protocol
When you have two different links between the same two switches, normally spanning tree will forward on one and block on the other. This means half o...
VTP Vlan Trunking Protocol
VTP is the VLAN trunking protocol. It's used to disseminate uniform vlan information between switches over 802.1q or ISL trunks. It can also "prune"...
802.1q and ISL trunks
Switches can have multiple vlans. When we connect switches together we use 802.1q trunks (or older ISL trunks) to run multiple vlans over one physica...
Intermediate spanning tree
We cover intermediate spanning tree concepts. The importance of specifying your root bridge and backup root bridge with spanning-tree priority. Usin...
VLANs and spanning tree
VLANs are a feature of ethernet switches which makes them act like multiple "virtual switches". Each VLAN is a separate broadcast domain and could be...
How ARP and Ethernet Work
So far we've talked about how IPv4 encodes data into a packet, and how routers learn which direction to forward those IPv4 packets based on the destin...
BGP route selection with MEDs
In BGP, MED stands for Multi Exit Discriminator. It is a well-known optional attribute which allows one autonomous system to inject it's IGP route me...
OSPF route filtering and area border routers
OSPF routes should be filtered or summarized at area border routers.
OSPF distribute-list problems
OSPF's fundamental design is that all routers in an area have the same exact view of the network topology. This is fundamentally incompatible with fi...
Totally stubby and not-so-stubby OSPF areas
OSPF totally stubby areas and not-so-stubby areas are ways to improve OSPF scalability. But they can be very confusing.
OSPF stub areas and neighbor synchronization
We cover OSPF stub areas and neighbor synchronization.
OSPF Redistribution
We redistribute from RIPv2 into OSPF and introduce autonomous system boundry summary LSAs and external summary LSAs.
OSPF Areas and Network Summary LSA's
We introduce multiple OSPF areas and network summary LSA's.
Introduction to OSPF
We show a single area OSPF network and go into router and network link state advertisements (LSA's) in detail.
Shortest Path First Algorithm
A brief tutorial on Dijkstra's Shortest Path First Algorithm. This algorithm is used by most link state routing protocols, including OSPF and IS-IS.
RIPv2
RIP version 2 includes subnet information in the route advertisement. It also improves efficiency by multicasting to RIPv2 routers instead of broadca...
Migrating from RIPv1 to IGRP via route redistribution
If you run two different routing protocols in two different parts of your network, you need to redistribute routes between the two routing protocols....
Migrating from RIPv1 to IGRP via "ships in the night" routing
"Ships in the night" routing refers to two routing protocols which do not interact with each other. We can migrate from one routing protocol to a mor...
IGRP: Interior Gateway Routing Protocol
IGRP is a Cisco-proprietary routing protocol. It is a classful distance vector protocol with a metric based on bandwidth and delay. This is superior...
RIPv1 distribute lists and offset-lists
RIP distribute lists deny specific route advertisements. RIP offset-lists increase the metric (hopcount) for specific route advertisements.
Problems with RIP Version 1
RIP version 1 route advertisements do not include a field for the netmask. This means receiving routers have to gess the netmask based on whatever in...
RIP Version 1
RIP version 1 is a classful routing protocol. We cover the RIP packet format and configuration. We see examples of split horizon and triggered updat...
Static routing and introduction to CEF
Routing protocols (and static routing) update the route table. The route table is used to forward packets. Cisco Express Forwarding (CEF) is a speci...
Serial and ethernet point-to-point links
We cable and configure ethernet and synchronous serial point-to-point links. In the next session these will be the "legs" of our triangle.
Classful IP addressing
Routers route packets based on the destination IP address: a 32-bit number included in the header of every IP packet. Historically, "large" sites wer...
Cisco 2500 password recovery
Every network engineer needs to be able to deal with a router with an unknown password. Whether you are taking over a site where the previous enginee...