300-320 · Question #144
What data center network layer provides service module integration, Layer 2 domain definitions, and default gateway redundancy?
The correct answer is B. aggregation. In the classic three-tier data center architecture, the aggregation (distribution) layer sits between core and access and is responsible for service module integration, VLAN boundary definitions, and first-hop redundancy protocols.
Question
What data center network layer provides service module integration, Layer 2 domain definitions, and default gateway redundancy?
Options
- Acore
- Baggregation
- Caccess
- Dedge
How the community answered
(18 responses)- A6% (1)
- B94% (17)
Why each option
In the classic three-tier data center architecture, the aggregation (distribution) layer sits between core and access and is responsible for service module integration, VLAN boundary definitions, and first-hop redundancy protocols.
The core layer focuses on high-speed, low-latency packet forwarding between aggregation blocks and does not handle service modules or gateway redundancy.
The aggregation layer integrates service modules such as firewalls and load balancers, defines Layer 2 domain boundaries by terminating VLANs, and provides default gateway redundancy using protocols like HSRP or VRRP. These responsibilities make it the policy and services hub of the data center hierarchy.
The access layer connects end hosts and servers to the network and does not manage service integration or Layer 2 domain definitions.
The edge layer connects the data center to the WAN or Internet and is not responsible for internal Layer 2 domains or default gateways.
Concept tested: Data center aggregation layer functions
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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