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Difficulty: HardNetwork Topologies and Types

An enterprise network engineering team is designing a highly resilient architecture to connect 6 core regional data centers while also deploying a dedicated block-level storage network for database clustering. The design must maximize fault tolerance across the core sites while maintaining strict isolation for storage traffic. Which of the following technical requirements and design characteristics accurately apply to this network topology and network type deployment? (Select TWO.)

  1. Interconnecting all 6 core data centers in a physical full-mesh topology requires exactly 15 dedicated point-to-point WAN links.Answer
  2. B
    Configuring separate VLANs across switches in a physical star topology enables direct Layer 2 frame exchange between different VLANs without a Layer 3 routing device.
  3. A Storage Area Network (SAN) provides block-level storage consolidation over a dedicated high-speed infrastructure isolated from local area network (LAN) client traffic.Answer
  4. D
    Assigning host interfaces and their default gateway addresses to different IP subnets in a star topology allows external routing to function normally.

Answer

The correct answers are the statement calculating 15 dedicated links for a 6-node full-mesh topology and the statement defining a Storage Area Network (SAN) as a dedicated block-level storage infrastructure.
The full-mesh link equation N(N−1)2\frac{N(N-1)}{2} yields 6×52=15\frac{6 \times 5}{2} = 15 physical links for 6 sites, ensuring complete point-to-point path redundancy. Additionally, a SAN specifically delivers block-level storage traffic across a specialized high-speed network isolated from client LAN traffic.

Step-by-Step Solution

1
Calculate the physical link requirements for a full-mesh topology connecting 6 sites.
Using the full-mesh link formula L=N(N−1)2L = \frac{N(N-1)}{2} where N=6N = 6, we calculate L=6×52=15L = \frac{6 \times 5}{2} = 15 links. This provides maximum redundancy and eliminates single points of failure.
Full-mesh physical topologies require direct links between every pair of nodes.
2
Identify the classification and architectural purpose of a Storage Area Network (SAN).
A SAN is a high-speed network type specifically designed for block-level storage transfer using protocols like Fibre Channel or iSCSI, separate from general LAN traffic.
Distinguishing network types (LAN, WAN, SAN, CAN, MAN) by performance profile and storage access protocols is essential for enterprise design.
3
Evaluate distractor options regarding VLAN isolation and default gateway subnets.
VLANs mandate Layer 3 routing for inter-VLAN communication. Default gateways must be on the same subnet as the host interface to be reachable.
Logical topology and broadcast domain rules enforce strict Layer 2 and Layer 3 boundaries.

Key Concept

Physical Mesh Link Calculations and SAN Architecture
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Topics

Network Topologies and Types

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