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.
ITU Interactive Transmission Map
As you all know, The International Telecommunication Union (ITU), originally the International Telegraph Union, is a specialized agency of the United Nations that is responsible for issues that concern information and communication…
MAC address format convert with excel
Format : 001122334455 -> 00:11:22:33:44:55 From MS Excel, 1. Put a raw MAC address : ex) 001122334455 on A1 2. Copy and paste…
Ethernet frame and MTU
Here is story about MTU. 1. Etherent frame size (without 802.1q) = 1518 Bytes Destination mac(6) + source MAC(6) + type(2) + data(1500) +…
Cisco Catalyst Switch Secure Configuration Template
Tweet Here is generic Cisco Catalyst Switch Secure Configuration Template Model 3750 Data Vlan ; AAA Voice Vlan ; BBB Native Vlan ; CCC…
How to find network card vendor by OUI lookup/MAC address
Tweet When you are troubleshooting an issue and need to identify device, OUI lookup is big help. OUI is first 24 bit of MAC address…
How to capture traffic using VACL
Tweet VLAN ACL can be used to capture live traffic (same as SPAN) 1. Create Access Map 2. Apply Capture Cisco_VACL_Capture# conf t…
How to configure a VLAN Access Map
Tweet There is three steps to create VLAN Access Map 1. Define the access map; ACL specifies what traffic to permit 2. Configure the…
How to configure L3 EtherChannel on TenGigabit X2-10GB-LR
Tweet Configuring Cisco_EtherChannel(conf)# int range tenGigabitEthernet 1/1 – 4 Cisco_EtherChannel(config-if-range)#no switchport Cisco_EtherChannel(config-if-range)#channel-group 10 mode active ; LACP Cisco_EtherChannel(config-if-range)#exit Cisco_EtherChannel(config)#int port-channel 10 Cisco_EtherChannel(config-if)#no switchport Cisco_EtherChannel(config-if)#ip address…
How to calculate total number of vlan-port instance or logical interface
As you know, there is an limitation of vlan-port instance (logical port) on certain platform. Here is the fomula to get that info. Total number…
Cisco error log “vlan-port instances exceeded limit of 1800”
Cisco 6504-E, with IOS 12.2(33) SXH5, indicated below message in the log…. "%PM-SP-4-LIMITS: The number of vlan-port(logical port) instances on module 3 exceeded the recommended…
How to configure IRB(Integrated Routing and Bridging)
Tweet [ Backgroud ] PC1 is connected to Fa0/0(no IP address, bridge) of Router = IP 10.10.10.1/24 PC2 is connected to Fa0/1(no IP address, bridge)…
STP(Spanning-Tree Protocol) flash tutorial
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
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