Author: Chris

Came across good Cisco IP routing concept and fundametal videos on Internet. It produced by Routehub is Premium Cisco Consulting provider of Cisco Products, Solutions,…

What is SONET & SDH? SONET and SDH are a set of related standards for synchronous data transmission over fiber optic networks. SONET stands for…

Here is well present about TCP/IP model from Youtube.com   {youtube}tCRBa3fTR3A{/youtube}  

What is implicit withdraw and explicit withdraw? ex} :   Route map for outgoing advertisements is out-cust-full                                                   Sent         …

Here is VoIP protocols on OSI 7 Layers   Layer 6 / Presentation ; G.729(A), G.723, G.711 Layer 5 / Session ; H.323, SIP, SDP…

Here is the sample configuration to allow traceroute(Unix or Network devices) and tracert(MS Windows) "TraceRoute" commands of Unix and Cisco devices send UDP packets, while…

Tweet Spiceworks; How Do I Resolve Unknown Windows Machines In A Domain Environment? Best practice and workaround see below article; http://community.spiceworks.com/help/Resolving_Unknown_Devices#Domain

What cause "err-disable"? see below conditions 1. Port-channel misconfiguration 2. DHCP snooping rate-limiting 3. Duplex mismatch 4. Bridge Protocol Data Unit(BPDU) Guard violation 5. UniDirectional…

Tweet Password recovery in Cisco Catalyst 5000 switch is performed in the following steps. Power cycle the Cisco Catalyst 5000 switch. Hit the Enter key…

Tweet Found the below link while googling some tutorial about STP(Spanning-tree Protocol).  It is easy to understand STP behavior. Enjoy http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf

Tweet STP(Spanning-Tree Protocol) Timers Hello timer Hello timer is the time between each Bridge Protocol Data Unit(BPDU) that is sent on a port. This is…