Networking - Networking Basics - Discussion

Discussion :: Networking Basics - Networking Basics (Q.No.25)


Which one of the following is true regarding VLANs?

[A]. Two VLANs are configured by default on all Cisco switches.
[B]. VLANs only work if you have a complete Cisco switched internetwork. No off-brand switches are allowed.
[C]. You should not have more than 10 switches in the same VTP domain.
[D]. VTP is used to send VLAN information to switches in a configured VTP domain.

Answer: Option D


Switches do not propagate VLAN information by default; you must configure the VTP domain. VLAN Trunking Protocol (VTP) is used to propagate VLAN information across a trunk link.

Pari said: (Jan 24, 2014)  
What is VLAN?

Manju Holi said: (Mar 13, 2014)  
Virtual Local Area Network.

Ashish Sharma said: (May 24, 2014)  
Definition of VLAN?

Sai said: (Nov 15, 2015)  
VLAN is defined as a collection of network devices existing same broadcast domain.

Ayush Mishra said: (Dec 18, 2015)  
VLAN is referred to as a group of devices connected on same or different LAN segments and can communicate with each other easily like they are connected to the same LAN.

VLAN is chiefly based on Logical connections instead of Physical connections and are very flexible.

Shubhanshu Singh said: (Oct 18, 2016)  
Please explain the difference between trunking and switching.

Ankit Sharma said: (Feb 16, 2017)  
Please explain the trunck and access.

Venkatesh said: (Feb 10, 2019)  
Trunk port means : we can send and receive multiple vlan information.

Access port means : we send and receive only one vlan information.

Vineela Andavarapu said: (May 23, 2019)  
In trunking a separate logical connection is created for each VLAN instead of a single physical connection. In tagging switch adds the source port's VLAN identifier to the frame so that other end device can understands what VLAN originated this frame. Based on this information destination switch can make intelligent forwarding decisions on not just the destination MAC address, but also the source VLAN identifier.

Since original Ethernet frame is modified to add information, standard NICs will not understand this information and will typically drop the frame. Therefore, we need to ensure that when we set up a trunk connection on a switch's port, the device at the other end also supports the same trunking protocol and has it configured. If the device at the other end doesn' t understand these modified frames it will drop them. The modification of these frames, commonly called tagging. Tagging is done in hardware by application-specific integrated circuits (ASICs).

Switch supports two types of Ethernet trunking methods:.

ISL [ Inter Switch Link, Cisco's proprietary protocol for Ethernet].

Imasha said: (Apr 11, 2020)  
I can't understand it. Please anyone help me to get it.

Sundar said: (May 12, 2020)  
Trunk - Switch to switch trunk mode Used.

Access - Switch to PC Access mode Used.

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