300-320 · Question #145
What are two advantages of a L2 looped data center design model? (Choose two.)
The correct answer is A. promotes Layer 2 high availability C. allows sharing of service modules. A Layer 2 looped design uses redundant uplinks between access and aggregation layers, providing high availability and enabling shared service modules at the aggregation tier.
Question
What are two advantages of a L2 looped data center design model? (Choose two.)
Options
- Apromotes Layer 2 high availability
- Bprevents VLAN propagation
- Callows sharing of service modules
- Deliminates the use of STP
- Eimproves data transfer speeds
How the community answered
(52 responses)- A94% (49)
- B2% (1)
- D4% (2)
Why each option
A Layer 2 looped design uses redundant uplinks between access and aggregation layers, providing high availability and enabling shared service modules at the aggregation tier.
Redundant Layer 2 uplinks in a looped topology ensure that a single link or switch failure does not isolate any access layer device, directly promoting Layer 2 high availability.
A L2 looped design actually propagates VLANs across redundant paths; it does not prevent VLAN propagation.
Because multiple access layer switches share the same aggregation layer devices, service modules such as firewalls and load balancers attached at the aggregation tier are accessible to all access layer nodes, enabling shared use.
L2 looped designs rely on Spanning Tree Protocol (STP) to prevent broadcast storms on redundant links; STP is not eliminated.
Improving raw data transfer speeds is not a defined characteristic of the L2 looped design model; it addresses redundancy and service sharing, not throughput.
Concept tested: Layer 2 looped data center design advantages
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DC_Infra2_5/DCI_SRND_2_5a_book/DCI_Overview.html
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