Category: LAN/WAN
A local area network (LAN) is a computer network covering a small physical
area, like a home, office, or small group of buildings, such as a school, or an airport. The defining characteristics of LANs, in contrast to wide-area networks (WANs), include their usually higher data-transfer rates, smaller geographic range, and lack of a need for leased telecommunication lines.
Metropolitan area networks, or MANs, are large computer networksOptical fiber connections to link their sites. usually spanning a city.
STP(Spanning-Tree Protocol) Timers
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…
Ethernet speed and duplex configuration
Tweet Speed mismatching issues may result in no connectivity. However, issues withauto-negotiation of duplex generally do not result in link establishment issues. Instead, auto-negotiation issues…
What is SYS-ID-EXT parameter in Spanning-tree?
Tweet The bridge ID priority is combined with the system ID extension to create the bridge ID priority for the VLAN. Bridge ID Priotirty =…
What is UDLD protocol ?
Tweet In order to detect the unidirectional links before the forwarding loop is created, Cisco designed and implemented the UDLD protocol. UDLD is a Layer…
Light level of fiber cable for 1000BASE-LX/LH
Tweet Here is light level information for single mode fiber for Gigabit Ethernet port. Most of cases, it doesn’t matter of how many port or…
EtherChannel configure mode with PAgP
Tweet PAgP facilitates the automatic creation of EtherChannel links by exchanging packets between channel-capable ports. The protocol learns the capabilities of port groups dynamically and…
Ethernet Cable Guide
Tweet UTP(Unshielded Twisted Pair) Cable Cat3, Cat5, Cat5e, Cat6 Weakness on Electromagnetic Interference(EMI) Installation Guide – Avoid direct sunshine and humidity – Enough distance from device…
How to read Cisco FastEthernet Interface status
Tweet Sometimes, by looking over some basic or fundamental information during troubleshooting, we got wrong path and wasted hack of time. If you carefully reviewed…
Issue on Cisco GigE port with FastEthernet port on 3Com switches
Tweet As you know, Cisco Systems is one of top vendor in Router and Switch market in the world since early 90’s. If someone asks who …
Many “runts” are being detect on Ethernet interface ?
Tweet Question: Many “runts” are being detect on Ethernet interface ? Answer: It could be duplex mismatching issue. First of call, Runts: These are…
What is Alignment Errors ?
Tweet Question : What is Alignment Errors ? Answer: I found the below information on Internet…. Alignment errors are a count of the number…
What is standard Ethernet frame size and MTU ?
Tweet Question: What is standard Ethernet frame size and MTU ? Answer: In my knowledge(not from Internet) Preamble is not calculated in frame size…
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