Back to Course

1.3.LAN Design Fundamentals

Flat Network

A flat enterprise campus network is where all end devices (PCs, servers, printers …) are connected to each other using Layer 2 switches. A flat network does not use subnets for any design purposes. Layer 2 devices in a flat network provide little opportunity to control broadcasts or to filter undesirable traffic. As more devices and applications are added to a flat network, response times degrade until the network becomes unusable.

Hierarchical Network

To address the limitations of the flat network and the sizing needs of most campus networks, a hierarchical model is used. A typical enterprise hierarchical LAN campus network design includes the following three layers:

  • Access layer: Local and remote workgroup access.
  • Distribution layer: Policy-based connectivity.
  • Core layer: High-speed switching.

The benefit of dividing a flat network into smaller, more manageable blocks is that local traffic remains local. Only traffic that is destined for other networks is moved to a higher layer.

Functions at the access layer include:

  • Layer 2 switching
  • High availability
  • Security (Port security, ARP inspection, Port access lists …)
    QoS
  • Spanning tree
  • PoE and auxiliary VLANs for VoIP

Functions at the distribution layer include:

  • Aggregation of LAN links
  • Policy-based security
  • Routing services
  • Redundancy and load balancing
  • Route aggregation and summarization
  • Broadcast domain control

Functions at the core layer include:

  • Providing high-speed switching
  • Providing reliability and fault tolerance
  • Avoiding CPU-intensive packet manipulation caused by security, inspection, QoS, or other processes

 

 

More Understanding

References

SEE ALL Add a note
YOU
Thêm bình luận
 
LEARNS mang đến cho học viên tri thức công nghệ cập nhật mới nhất, và áp dụng ngay được vào công việc thực tiễn.

LEARNS định vị trở thành sàn đào tạo công nghệ online hàng đầu thông qua chất lượng giảng dạy vượt trội từ những giảng viên chuyên gia đầu ngành.

LEARNS - Sản phẩm của VINSYS Vietnam

Liên Hệ

  • VINSYS JSC, 7th Floor - Sannam Building, 78 Duy Tan Street, Cau Giay, Hanoi, Vietnam
  • 8:00 - 22:00 hàng ngày
  • contact@learns.vn
  • Hotline 0989 746 790
  • Website: learns.vn
top
2020 © Learns.vn.

Login

  • Họ tên (bắt buộc)

    Họ tên

  • Địa chỉ

    Địa chỉ

  • Tóm tắt thông tin

    Tóm tắt thông tin

  • Facebook

    Facebook profile link

  • Twitter

    Twitter profile link

  • Chuyên môn

    Kỹ năng chuyên môn

  • Register
Create an Account Back to login/register