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352-001 · Question #794

Refer to the exhibit. A new high availability DB sever cluster is installed in the network. These two servers require high bandwidth and low latency Layer 2 connectivity for database replication. Whic

The correct answer is C. Add two new links between SW1 and SW2 configured as REP segment 3. A dedicated REP segment between SW1 and SW2 provides simultaneous forwarding on both links with fast failover, meeting the high-bandwidth and low-latency Layer 2 requirements for DB replication.

Layer 2 Control Plane

Question

Refer to the exhibit. A new high availability DB sever cluster is installed in the network. These two servers require high bandwidth and low latency Layer 2 connectivity for database replication. Which solution supports these requirements?

Exhibit

352-001 question #794 exhibit

Options

  • AAdd two new links between SW1 and SW2 configured as LACP trunk with STP
  • BAdd secondary links to REP segments 1 and 2
  • CAdd two new links between SW1 and SW2 configured as REP segment 3
  • DAdd two new links between SW1 and SW2 configured as REP segments 1 and 2 respectively

How the community answered

(36 responses)
  • A
    14% (5)
  • B
    19% (7)
  • C
    61% (22)
  • D
    6% (2)

Why each option

A dedicated REP segment between SW1 and SW2 provides simultaneous forwarding on both links with fast failover, meeting the high-bandwidth and low-latency Layer 2 requirements for DB replication.

AAdd two new links between SW1 and SW2 configured as LACP trunk with STP

With LACP trunk and STP, spanning tree will block one of the two parallel links to prevent loops, cutting available bandwidth in half and defeating the high-bandwidth requirement.

BAdd secondary links to REP segments 1 and 2

Adding secondary links to existing REP segments 1 and 2 does not create a dedicated path for the DB servers and risks disrupting the existing segment topology and port roles.

CAdd two new links between SW1 and SW2 configured as REP segment 3Correct

Configuring the two new links as a single REP segment (segment 3) creates an independent resilient Ethernet ring dedicated to the DB cluster. REP allows all links in a segment to forward traffic and performs sub-50ms failover, delivering the high bandwidth and low latency needed for database replication without STP blocking any link.

DAdd two new links between SW1 and SW2 configured as REP segments 1 and 2 respectively

Assigning each new link to a separate existing segment (1 and 2 respectively) does not form a dedicated ring between SW1 and SW2 for the DB cluster; it fragments the links across unrelated segments and does not provide the combined bandwidth or isolation required.

Concept tested: REP segment design for dedicated high-availability Layer 2 path

Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-2_04_E/configuration/guide/config/rep.html

Topics

#REP#layer 2 high availability#link aggregation#server cluster

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