Today, I learned about the VLANs.
VALNs: Motivation
Drawbacks of this configuration:
- Lack of traffic isolation:
- Single broadcast domain: all layer-2 broadcast traffic (APR, DHCP, switch flooding to find unknown location of destination MAC address must cross entire LAN.
- Secuirty/privacy, efficiency issues
- Inefficient use of swithches:
- Each small group needs a switch, while a switch has 96 ports
- Managing users:
- Employees move between groups, or buildings. Emplyee may belong to several groups.
So, what is VLANs?
VLAN stands for 'Virtual Local Area Network!'
VLAN: switch(es) supporting VLAN capabilities can be configured to define multiple virtual LANs over single physical LAN infrastructure.
There is "Port-based VLAN."
- Traffic isolation
- frames to/from ports 1-8 can only reach ports 1-8
- This can also define VLAN based on MAC addresses of endpoints, rather than switch ports
- Dynamic membership
- Ports can be dynamically assigned among VLANs.
- Port 3 assigned to CS
- Ports can be dynamically assigned among VLANs.
- Forwarding between VLANS
- It is done via routing(just as with separate switches).
- In practice vendors sell combined switches plus routers.
- It is done via routing(just as with separate switches).
Trunk port: carries frames between VLANs defined over multiple physical switches.
'Computer Science ๐ > Network Programming ๐ฐ๏ธ' ์นดํ ๊ณ ๋ฆฌ์ ๋ค๋ฅธ ๊ธ
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