Connect Back to Back 3550
Jul30

Connect Back to Back 3550

I know this is stupid…. but I spent a while on it so if you have to connect two Cisco 3550 switches directly to each other on an Ethernet port you must use a crossover cable. Even though a straight through will do for a connection to a 3650…...

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How Fundamental Routing Decisions are Made
Jul30

How Fundamental Routing Decisions are Made

Today I wanted to take a closer look at how fundamental routing decisions are made. At some point there are going to be situations where knowledge of how and why a router will or won’t route a packet given a certain set of circumstances will be key to fixing and overcoming a off-the-wall CCIE lab requirement thrown at you. Protocol specifics aside, how a router derives its logic to route a packet, install a route or determine how to...

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Understanding Private VLANS
Jul30

Understanding Private VLANS

Private VLANs allow administrators and service providers restrict traffic between hosts in a common segment or subnet. This can be useful for security purposes or if you have a multi tenant building with one switch and router, such as a hotel, and need to confine each room / user to their own segment with access to the same default gateway and / or servers while still utilizing just one VLAN. Private VLANs can only be configured when...

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