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400-007 · Question #73

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. For high-bandwidth, low-latency Layer 2 DB replication, adding two links between SW1 and SW2 as a dedicated REP segment provides loop-free full-bandwidth forwarding without STP port blocking.

Designing Network Infrastructure

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

400-007 question #73 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

(40 responses)
  • A
    10% (4)
  • B
    28% (11)
  • C
    55% (22)
  • D
    8% (3)

Why each option

For high-bandwidth, low-latency Layer 2 DB replication, adding two links between SW1 and SW2 as a dedicated REP segment provides loop-free full-bandwidth forwarding without STP port blocking.

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

LACP trunking with STP would cause STP to block one of the two new links to prevent a loop, halving available bandwidth and introducing STP convergence delays on failure.

BAdd secondary links to REP segments 1 and 2

Adding secondary links into existing REP segments 1 and 2 would alter the topology of those active segments, risking disruption to traffic already flowing through them.

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

REP (Resilient Ethernet Protocol) provides fast convergence in ring topologies by blocking only one port per segment rather than relying on STP's per-VLAN convergence timers. Configuring the two new links as REP segment 3 creates a dedicated isolated segment between SW1 and SW2, preserving the existing segments 1 and 2 while giving the DB servers a dedicated high-bandwidth, low-latency Layer 2 path with REP's sub-second failover.

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

Splitting the two new links across REP segments 1 and 2 respectively integrates them into existing production segments rather than providing a dedicated path, and it does not create a single high-bandwidth channel for the DB servers.

Concept tested: REP segment design for dedicated high-bandwidth Layer 2 paths

Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swrep.html

Topics

#REP segment#Layer 2 high availability#DB replication#link aggregation

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