What does VLAN 1 mean?
Vlan 1 is the deafult vlan which is used to send control traffic like VTP,STP,DTP,CDP over the links.It has nothing to do with the native vlan.In earlier IOS versions removing vlan 1 over the trunk wasnot allowed as the control traffic was only bound to vlan1.
Can you have a VLAN within a VLAN?
Nested VLANs, also known as VLAN double tagging, are used to overlay a private Layer 2 network over a public Layer 2 network. With a nested VLAN configuration, each customer is given a customer-ID (CID), which is a unique identifier within the service provider infrastructure.
What are the four types of VLANs?
4.1 Types of VLAN’s
- Layer 1 VLAN: Membership by Port. Membership in a VLAN can be defined based on the ports that belong to the VLAN.
- Layer 2 VLAN: Membership by MAC Address.
- Layer 2 VLAN: Membership by Protocol Type.
- Layer 3 VLAN: Membership by IP Subnet Address.
- Higher Layer VLAN’s.
Why you should not use VLAN 1?
Even though normal network traffic crossing a trunk link is going to require a VLAN tag in the headers, the switch-to-switch control-plane communication is sent with no header present. If we leave the default native VLAN as 1, then a malicious developer could exploit this to gain access to another segment.
Is VLAN 1 always untagged?
VLAN 1 is the default VLAN on Cisco switch ports, including the default native VLAN. As VLAN 1 is the default native VLAN, it is used for untagged traffic. If you need to pass frames tagged VLAN 1, you will not be able to, by default.
Can VLAN 1 be deleted?
The only way we can remove VLAN 1 is through the “switchport trunk allowed vlan remove 1″ command. A good thing of clearing VLAN 1 is user data cannot travel via this VLAN anymore. BPDU traffic is also banned on this VLAN.
Can 2 VLANs talk to each other?
Devices in different VLANs cannot communicate when only using layer 2 switches. In other words, a layer 2 switch allows devices in the same VLAN or subnet to communicate. Any VLAN to VLAN communication will not be allowed with just a layer 2 switch.
Can 2 VLANs have the same IP range?
The OSA-Express Layer 2 implementation allows the hosts to manage IP addresses and ARP cache, so it is possible to have a single guest LAN segment (or VSWITCH segment) where two different hosts use the same IP Address on different VLAN groups. …
Why are VLANs used?
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 the difference between LAN and VLAN?
The main difference between LAN (Local Area Network) and VLAN (Virtual Local Area Network) is that LAN work on single broadcast domain on the other hand VLAN works on multiple broadcast domain and In local are network, the Packet is advertised to each device while In virtual local area network, packet is send to …
