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Difficulty: MediumHigh Availability and Redundancy Concepts

Match each high-availability technology or protocol on the left with its primary operational characteristic on the right.

  • Virtual Router Redundancy Protocol (VRRP)Provides default gateway redundancy by sharing a virtual IP address between a primary active router and backup routers.
  • Link Aggregation Control Protocol (LACP)Combines multiple physical Ethernet connections into a single logical channel for link-level redundancy and increased throughput.
  • Active-Active Server ClusteringDistributes incoming network traffic and workloads concurrently across all active nodes to optimize performance and prevent downtime.
  • Multipath I/O (MPIO)Establishes multiple redundant physical paths between host adapters and storage area network (SAN) storage volumes.

Answer

Virtual Router Redundancy Protocol (VRRP) matches default gateway redundancy via a shared virtual IP; Link Aggregation Control Protocol (LACP) matches combining physical connections into a single logical link; Active-Active Server Clustering matches concurrent workload distribution across all nodes; Multipath I/O (MPIO) matches establishing redundant physical paths to SAN storage volumes.
Each technology corresponds to a distinct layer of high availability: VRRP delivers Layer 3 default gateway resilience through virtual IP sharing; LACP provides Layer 2 link aggregation and link failover; Active-Active clustering processes workloads across all nodes simultaneously; and MPIO provides redundant physical connections between server HBAs and SAN storage.

Step-by-Step Solution

1
Identify the protocol providing Layer 3 default gateway failover.
Virtual Router Redundancy Protocol (VRRP) shares a single virtual IP across multiple redundant routers.
VRRP ensures continuous default gateway availability if the active router fails.
2
Identify the standard protocol for switch link aggregation.
Link Aggregation Control Protocol (LACP) bundles physical links into a single logical Channel/Trunk.
LACP operates according to IEEE 802.3ad to provide throughput enhancement and link redundancy.
3
Determine the cluster model that processes requests simultaneously across members.
Active-Active Server Clustering handles workloads across all available cluster nodes concurrently.
Unlike Active-Passive configurations, Active-Active utilizes all hardware resources simultaneously during normal operation.
4
Determine the fault-tolerance mechanism for host-to-storage interconnects.
Multipath I/O (MPIO) manages redundant storage interface hardware and cabling.
MPIO prevents storage access outages by rerouting block storage traffic if an HBA, cable, or switch port fails.

Key Concept

High Availability and Redundancy Concepts across Network Layers
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Topics

High Availability and Redundancy Concepts

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