Everything You Need To Know About Trunking And Trunking Protocols For Your Cisco CCNA / CCNP / BCMSN Exam

Trunking and trunking protocols are an important part of your Cisco CCNA, CCNP, and BCMSN exams. If you want to do well on the exams, it’s important to understand these concepts and how they work. In this blog post, we will go over everything you need to know about trunking and trunking protocols so that you can ace your Cisco CCNA, CCNP, and BCMSN exams. We’ll cover topics such as trunking protocols, VLANs, and more. So, let’s get started!


What is trunking?
Trunking is a networking technology that allows for the creation of a virtual connection between multiple networking devices. It is typically used to connect different network segments such as a LAN and a WAN, or to interconnect switches and routers to form an even larger network. Trunking allows for more efficient use of the available bandwidth, improved redundancy, and better performance overall. It also helps to reduce network congestion and latency. Trunking protocols are the standards used to configure and manage trunked connections between two or more devices. Commonly used trunking protocols include 802.1q, Inter-Switch Link (ISL), and Multiprotocol Label Switching (MPLS).

What are the benefits of trunking?
Trunking offers many benefits when it comes to connecting multiple networks and devices. It increases the total bandwidth available by combining multiple physical links into a single logical link, allowing more data to be transferred at any one time. It also reduces the number of cables required to establish connections between devices, reducing cost and clutter. Additionally, it allows devices to communicate over multiple different VLANs, increasing the potential for better network segmentation and security.


What are the different types of trunking protocols?
Trunking protocols are methods of aggregating multiple physical links between two networking devices into a single logical connection. There are several different types of trunking protocols, each with its own strengths and weaknesses. The most common trunking protocols used in Cisco networks are VLAN Trunking Protocol (VTP), Link Aggregation Control Protocol (LACP), and Generic Trunking Protocol (GTP).
VTP is a Cisco-proprietary protocol that is used to manage the creation and deletion of VLANs on a network, as well as other tasks such as assigning switch ports to specific VLANs. LACP is used to bundle multiple Ethernet links into a single logical connection for increased bandwidth. GTP is an open-source protocol that enables routers to create virtual links between one another, allowing them to send and receive data across multiple trunked connections.

Which trunking protocol is right for my network?
When it comes to trunking protocols, the main choices are Inter-Switch Link (ISL), IEEE 802.1Q, and Generic Trunking Protocol (GTP). Each of these protocols has its own advantages and disadvantages. ISL is an older protocol that was developed by Cisco and is still supported by most Cisco switches. It supports VLANs, but only up to 1000, which may be a limitation for some networks. IEEE 802.1Q is an industry standard protocol that supports up to 4096 VLANs and provides better performance than ISL. GTP is a proprietary protocol from Cisco that offers advanced features such as tunneling, dynamic VLAN assignments, and quality of service options. All three trunking protocols are supported by most Cisco switches, so it really comes down to the size of your network and the features you need when deciding which one to use.


How do I configure trunking on my Cisco devices?
Configuring trunking on your Cisco devices is essential for any network administrator, as it allows for the interconnection of multiple Layer 2 networks. Trunking is a method used to combine multiple physical links into one logical link, and when configured correctly, can increase throughput, availability, and resilience. To configure trunking on your Cisco device, you must first enable trunking on the port. This is done with the command switchport mode trunk. Once trunking is enabled, you will need to configure the trunking protocol to be used. Cisco IOS supports a variety of trunking protocols, including 802.1q and ISL. In addition, you will also need to configure native VLANs on each port as part of the trunking setup process. Following these steps will allow you to properly configure trunking on your Cisco devices and ensure that your networks are operating efficiently and securely.

What are some common troubleshooting tips for trunking?