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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?

    • The CE router peers with the PE router at Layer 3 and the provider participates in customer routing
    • The customer routers form a full mesh of direct Layer 2 adjacencies with each other
    • The provider only forwards frames and never sees customer IP addresses
    • 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 load sharing across both circuits
    • Redundancy as a backup path, typically installed with a floating static route or route 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?

    • It removes the need for any physical circuits at the branch
    • It centralizes policy and can steer application traffic across multiple transports based on real-time 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?

    • It provides confidentiality and integrity but inherits the internet's best-effort delivery with no bandwidth guarantee
    • It provides the same latency and jitter guarantees as an MPLS circuit
    • 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