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Extension practice

WAN Architectures Practice Questions

Extension practice: Leased lines, MPLS L3VPN, broadband, cellular backup, SD-WAN, and WAN topologies.

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One solved question, so you can see how these are marked

Which WAN option is normally purchased as a dedicated point-to-point service with committed bandwidth, subject to the provider contract and SLA?

Leased line

A leased line is normally a dedicated provider service between endpoints with contracted capacity and service targets. Broadband and an internet VPN generally use shared, best-effort infrastructure, although exact guarantees always come from the service contract.

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All 6 WAN Architectures questions in this set

Answers and explanations appear when you work through the set above.

  1. In an MPLS Layer 3 VPN service, what is the relationship between the customer router and the provider network?

    • CE and PE peer at Layer 3; the provider participates in customer routing
    • Customer routers form a full mesh of direct Layer 2 adjacencies
    • The provider forwards Ethernet frames without inspecting customer IP
    • Each site must run BGP directly with every other customer site

  2. A branch office uses a broadband internet circuit as its primary WAN link, with a cellular LTE connection configured to take over only if it fails. What is the LTE link providing?

    • Active sharing, with both circuits forwarding production traffic during normal operation
    • Backup redundancy via floating static routes or tracking
    • A dedicated leased line replacement
    • Layer 2 extension between sites

  3. What is the main advantage of SD-WAN over a traditional single-circuit WAN design?

    • Central software forwards branch traffic without any physical WAN transport circuit
    • Central policy steers applications across transports using path quality
    • It guarantees zero packet loss over the public internet
    • It eliminates the need for encryption between sites

  4. Which topology connects every site directly to every other site, giving optimal paths at the cost of link count and complexity?

    • Hub and spoke
    • Full mesh
    • Partial mesh
    • Point-to-point

  5. Which statement about a site-to-site IPsec VPN over the public internet is accurate?

    • Encrypted, integrity-protected traffic over best-effort internet, without bandwidth guarantees
    • Confidentiality and integrity with MPLS-equivalent latency and jitter guarantees on public links
    • It requires client software to be installed on every host at both sites
    • It operates at Layer 2 and extends the same broadcast domain between sites

  6. A small office needs a single device to provide routing, switching, wireless, NAT, and firewalling. Which architecture does this describe?

    • Three-tier campus
    • Spine and leaf
    • SOHO
    • Collapsed core data centre