Often asked: Why Trunk Port?

What is a trunking port?

A trunk port is a specific type of port on a network switch that allows data to flow across a network node for multiple virtual local area networks or VLANs.

What is a trunk port configured for?

Sets the interface as an Ethernet trunk port. A trunk port can carry traffic in one or more VLANs on the same physical link (VLANs are based on the trunk-allowed VLANs list). By default, a trunk interface can carry traffic for all VLANs.

What is VLAN trunking used for?

VLAN trunking enables the movement of traffic to different parts of the network configured as a VLAN. A trunk is a point-to-point link between two network devices that carry more than one VLAN. With VLAN trunking, you can extend your configured VLAN across the entire network.

What is an access port vs a trunk port?

Trunk port allows us to switch multiple VLANs but in Access port all frames are in the same VLAN. Trunk port basically used to connect between switches however, the access port is used to connect computer laptops, printers, etc. We cannot extend the data from one switch to another switch, access ports via a trunk port.

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Do trunk ports need IP address?

The router needs to have an IP address /mask associated with each VLAN on the trunk. However, the router has only one physical interface for the link connected to the trunk.

How do you build a trunk port?

To enable trunk links, configure the ports on either end of the physical link with parallel sets of commands. To configure a switch port on one end of a trunk link, use the switchport mode trunk command. With this command, the interface changes to permanent trunking mode.

When would you use a trunk port?

A trunk port allows you to send all those signals for each switch or router across a single trunk link. In contrast to an access port, a trunk port must use tagging in order to allow signals to get to the correct endpoint. Trunk ports typically offer higher bandwidth and lower latency than access ports.

How do I allow VLANs in trunk?

To specify that only certain VLANs are allowed on the specified trunk, use the switchport trunk allowed vlan command. If you do not configure this parameter, the trunk port uses the default VLAN as the native VLAN ID. You can specify the IDs for the VLANs that are allowed on the specific trunk port.

Can you connect a host to a trunk port?

Each port on a Cisco switch can be configured as either an access or a trunk port. This port type is configured on switch ports that are connected to devices with a normal network card, for example a host on a network. trunk port – a port that is connected to another switch.

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What is VLAN how it works?

Virtual Local Area Networks ( VLANs ) separate an existing physical network into multiple logical networks. Thus, each VLAN creates its own broadcast domain. Communication between two VLANs can only occur through a router that is connected to both. VLANs work as though they are created using independent switches.

How do I test a trunk port?

To display the status of the trunk, determine the native VLAN used on that trunk link and verify trunk establishment using the show interfaces trunk command. The following output shows that the native VLAN on one side of the trunk link was changed to VLAN 2.

Why do we need VLANs?

A VLAN allows different computers and devices to be connected virtually to each other as if they were in a LAN sharing a single broadcast domain. VLANs can help reduce IT cost, improve network security and performance, provide easier management, as well as ensuring network flexibility.

What is port mirroring used for?

Port mirroring is used on a network switch to send a copy of network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port.

What does trunking mean?

Trunking is a technique used in data communications transmission systems to provide many users with access to a network by sharing multiple lines or frequencies. As the name implies, the system is like a tree with one trunk and many branches.

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