You are designing network connectivity into a mission critical site. What are three design elements required to complete this design? (Choose three.)

Question

Options

• Adiverse entrance facilities
• Bfirewall cluster
• C802.11 wireless point-to-point
• DDSL/cable modem service
• Eredundant Internet border routers

• A
  77% (36)
• C
  6% (3)
• D
  17% (8)

Explanation

For a mission-critical site, redundancy and protection at every layer are non-negotiable. Diverse entrance facilities (A) ensure physical path redundancy - if one cable conduit is cut or damaged, traffic still flows through a separate physical entry point. Redundant Internet border routers (E) eliminate single points of failure at the network edge, keeping connectivity up if one router fails. A firewall cluster (B) provides both security and high availability, protecting the site while remaining operational if one firewall node goes down.

C (802.11 wireless point-to-point) is wrong because wireless links are susceptible to interference, weather, and physical obstructions - not suitable as a primary link for mission-critical sites. D (DSL/cable modem) is a consumer-grade service with no SLA guarantees, making it inappropriate for mission-critical connectivity.

Memory tip: Think "Protect the Path at Every Layer" - Diverse entrances protect the physical path, Border routers protect the logical/routing path, and Firewall clusters protect the security boundary. All three must be redundant to call a site truly mission-critical.

No community discussion yet for this question.