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
When most traffic in a datacenter is east-west, what LAN architecture is optimal
spine-leaf
Define spine leaf architecture
Every spine switch is connected to every leaf switch
Leaf switches do not connect to other leaf switches, and spine switches do not connect to other spine switches
End hosts are only connected to leaf switches
How is traffic load balanced in spine leaf architecture
Paths are randomly chosen, since each server is separated by the same number of hops
SOHO refers to:
Small office / home office
What is the defining feature of SOHO networks that separates them from enterprise networks
One device pulls duty as switch, router, modem, and firewall
T/F: STP and FHRP should be synchronized to ensure traffic from end hosts follows the most direct path to the default gateway
T
How should STP and FHRP be synchronized in a network?
FHRP active and STP root bridge should be the same device
FHRP standby and STP secondary root should be the same device
