VLAN (Virtual LANs) are sometimes difficult to troubleshoot and you face a lot of confusion in isolation a problem especially in an environment where there are alot of VLANs. And this is common in today’s networks, there are hundreds of VLANs on switches and you are required to grasp a knowledge of troubleshooting VLANs in [...]
The designated cost is the cost of the directly connected router to the root bridge. Example is explained as follows:
For example when we change the cost of F1/1 of SWC to 5 for VLAN 2 and cost of F1/2 of SWB for VLAN 2 to 11, SWD shows 16 (11+5) as a designated [...]
>> If you see the value of Root Bridge and Bridge ID to be the same for some switch, that will indicate that the current switch is the root bridge. Its shown below:
The value 32768 is the default value . The root path cost is the cost of the [...]
>> The Root port is the one which is connected to the Root Bridge. As shown in the output of Switch 2 below, the Role of Ethernet 0/1 is “Root” which proves that this port connects to Switch1 (through Cross-over cable).
The designated port is the one which has the lower cost. The [...]
>> The Root ID is the combination of bridge priority and base MAC Address as shown below:
>> There are 3 modes of STP
(a) MST (Multiple Spanning Tree)
(b) PVST (Per-VLAN Spanning Tree Mode)
(c) Rapid PVST
Rapid PVST uses IEEE 802.1w which gives a good package to all the issues which are addressed by [...]
The acronym VLAN expands to Virtual Local Area Network. A VLAN is a logical local area network (or LAN) that extends beyond a single traditional LAN to a group of LAN segments, given specific configurations. Because a VLAN is a logical entity, its creation and configuration is done completely in software.
More info on VLANs from [...]
CBT Nuggets is the best video training available about Cisco and other technology certifications. IP Subnetting is an important part of CCNA 640-802 or ICND2 640-816 and ICND1/CCENT 640-822 exams. Actually it is the basis of all the future Cisco certifications and rather a base of your networking skills. Here are the complete online video [...]
A very good video explanation of IPv6 protocol. Todd Lammle explains how IPv6 works.
IPv6 stands for Internet Protocol version 6. It is the second version of the Internet Protocol to be used generally across thevirtual world. The first version was IPv4. IPv5 was a protocol of a different sort, intended to support video and audio [...]
If you want to practice your CCNA skills, you should use some kind of exam simulation in order to see that how competent you are and in which topics you still need to work. Here is a link where you can find different kinds of free exams related to CCNA. For example, if you are [...]