VLANs and Inter-VLAN Communication Flashcards
What does VLAN stand for?
Virtual Local Area Network
What is VLAN?
VLAN is a virtual local network where computers, servers, and other computer networks are logically connected regardless the physical area.
What does VLAN provide?
- Improved Security
- Traffic Management
- Make a network simpler(by segmentation following groups)
How does VLAN improve network performance? Explain
By separating large broadcast domains into smaller ones. (Since when there is only one broadcast domain, it would cause traffic since there are many hosts. With VLAN, it can separate them into respective groups, meaning smaller broadcast domains. )
List the primary benefits of VLAN.
- Security
- Cost Reduction
- Better Performance
- Shrinks broadcast address
- Improved IT staff efficiency
- Simpler project and application management.
Explain how Security is one of the benefits
Groups that have sensitive data can be separated from the rest of the network, decreasing the chances of the data being leaked
Explain how it gives Cost Reduction
Since they are using vlan, they do not have to waste money on unnecessary expensive network upgrades and also the vlan is efficient in existing bandwidth and uplinks
Explain how it gives Better Performance
Since VLANs can divide networks into multiple broadcast domains, it reduces the unnecessary traffic, hence it’ll boost performance.
Explain how Shrinking Broadcast Address is one of the benefits
Dividing a network into VLANs would reduce the number of hosts of each broadcast domain.
List the types of VLAN
-Data VLAN
-Default VLAN
-Native VLAN
-Management VLAN
Voice VLAN
What is data VLAN configured to?
Data VLAN is configured to carry user-generated traffic (eg- VLAN 20, VLAN 10)
Why are data VLANs sometimes referred to as user-VLANs?
They are referred to as USER VLANS because they divide networks into groups of users and devices. (Eg: VLAN 20 is only for STAFFS, VLAN 10 Is only for students.)
Example of Default VLAN
VLAN 1
Can default VLAN be renamed or deleted?
No
What is tagged traffic
Tagged traffic are frames that are attached with VLAN information, with the information the main switch would know which VLAN the frame would want to go.
What is native vlan?
Native vlan is is the VLAN that handles untagged frames. Untagged frames are assumed to not have a specific VLAN to go to, hence they would deliver the frame to every single VLAN in the network. So basically the frame is attached with a “native VLAN”, so when the main switch reads that, it’ll automatically send it to every switch. Example NATIVE VLAN IS VLAN 1 since VLAN 1 does not do tagging to the frames it sends, thus every VLAN will receive the frame.
What is a trunk port?
Trunk ports are the links between switches that carry more than one VLAN.
What is Management VLAN?
Management VLAN is a data VLAN that is configured for network management traffic.
What is network management traffic?
Configuring another device with another device
What is the type of network that has the transmission priority?
Voice over IP.
What is voice VLAN?
Voice VLAN is a separate VLAN that supports VOICE over Ip traffic. They have assured bandwidth to ensure voice quality.
explain the process on how the switches attach the vlan to the frame so that the frame can be tagged
When a pc that is connected to a vlan, we know that the vlan is connected to a configured port(switchport access vlan 10 is assigned to f0/11 port, meaning the pc is now connected to vlan 10 instead of the main switch). So when the switch receives a frame from the PC on that particular VLAN, it will attach the frame with the VLAN, so now the frame is tagged and the frame will be sent out to the trunk port.
Why do we use trunk ports?
We use trunk ports to allow devices with different switches but same VLAN to communicate with each other. Trunks will basically open up all the VLANs, so for the case of different VLANs with diff networks, with routers they can now ping each other as the trunk opens up all the VLANs.
How many byte and bits does a tag holds?
4 bytes, 32 bits
what does a tag represent
Tags represent a VLAN
What happens if a native VLAN receives a tagged frame and the frame is tagged as the same VLAN id as the native VLAN
It will drop the frame. Native vlan only receives untagged traffic.
VTP stands for
VLAN trunking protocol
What does VTP DO
Helps manage VLAN configurations between switches
What can VTP store and learn?
VTP can only learn and store Normal Range Vlans.
In normal ranged VLANs, where are their configurations stored?
Stored in a VLAN database file called vlan.dat, it is located in the switch’s flash memory.
Where are the extended VLANs configurations stored at?
Running configurations.
As we know that trunks would open VLANs, do they open all the VLANs available in the switch? (VLAN 1-4094)
NO! the trunk will only open the VLANs that were opened in that switch.
