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.
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
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)- A10% (4)
- B28% (11)
- C55% (22)
- D8% (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.
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.
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.
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.
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
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