LAN Architecture Flashcards
When several devices all connect to one central device, it can be called a _____ topology
Star topology
When each device is connected to every other device, this is referred to as a ____ topology
Mesh
When some devices are connected to each other, but not all, this is called a _____ topology
Partial mesh
What two layers make up a two-tier campus LAN design?
Access and distribution
A 2-tier campus design is also referred to as a _____ because it omits a layer found in the 3-tier campus design
Collapsed Core
What is the role of the access layer?
- Connects to end hosts
- QoS marking (typically)
- Security services like port security, DAI, etc
- PoE service
What is the role of the 2-tier campus distribution layer?
- Aggregate connections from Access switches
- The border between L2 and L3 (typically)
- Connect to WAN services
In a collapsed core design, the distribution layer is sometimes referred to as the
Core-Distribution layer
A 3-tier campus network architecture is reccommended when when:
You have more than 3 distribution layers in a single location
A 3-tier campus LAN design consists of:
- Core Layer
- Distribution Layer
- Access Layer
What is the role of the 3-tier campus core layer?
- Connects distribution layers together in large LAN networks
- Focus on speed
- CPU-intense operations like security, QoS marking, etc should be avoided
Connections at the core layer are all layer __
3
Define North-South traffic
Traffic that flows from access layers up to the core and external networks
Define East-West traffic
Traffic that flows from access layer to access layer
When most traffic in a datacenter is north-south, what LAN architecture is optimal?
3-tier campus
