ccna vs security plus

ccna vs security plus.VLAN Trunking Protocol (VTP) is a Cisco-specific protocol used to share VLAN configuration information between Cisco routers on a trunk connection.VTP enables switches to share and synchronize VLAN information to ensure consistent VLAN configuration across the network.For example, suppose you have a network with two switches and you need to add a new VLAN. it is easy to simply add that VLAN manually on both switches. However, if there are 30 switches in the network, this task becomes more difficult and tedious. In this case, you might make a mistake in configuring that VLAN on one of the switches - assigning the wrong VLAN identifier and forgetting to add it on one of the switches. oVTP can help solve this problem. Using VTP, you can add this VLAN on one of the switches and have that switch propagate this new VLAN to all other switches in the Layer 2 network via VTP messages, having them add this VLAN as well oThis is also true when you modify the configuration of a VLAN or delete a VLAN: VTP ensures that the VLAN configuration is consistent across all switches.VTP even performs a VLAN conformance check to ensure that the VLANs are configured consistently across the switches. For example, the configuration of a VLAN includes a number, name, and type. If you configure a VLAN with a number and name of 1 and admin, respectively, on one switch, and configure that VLAN with a name of administrator on another switch, VTP will be able to find and fix this inconsistent configuration.VTP messages are only propagated over trunk connections, so to share VLAN information over VTP, a trunk connection needs to be established between the switches.VTP messages are propagated as Layer 2 multicast frames, so if there is a router in between the two switches, the router will not forward VTP messages from one of its ports to the other.For VTP to work correctly, the switch must be added to a VTP domain, which is a group of switches that share VLAN information, similar to the autonomous systems used by some routing protocols (autonomous systems and routing protocols are described in Chapter 14). Each switch can belong to only one VTP domain. the VTP domain has a name and when the switch generates a VTP message, it will include the domain name in the message. When the switch receives a VTP message, it will not accept the VLAN change information in the message if it contains a domain name that is different from the domain name it has configured. In other words, a switch in one VTP domain will ignore VTP messages from switches in other domains. The next few subsections describe the components and messages used by VTP, as well as some of its benefits, such as pruning.VTP is a Cisco-specific protocol that transmits messages over trunk connections and is used to ensure that the VLAN configuration of all switches in a domain is consistentlyConsistent: a VLAN can be added to one switch and propagated to other switches. However, switches ignore VTP domains from otherVTP messages from other VTP domains.12.3.1 VTP ModeWhen configuring VTP, you can choose from 3 different modes for the switch configuration: