N10-005 Question #783: Real Exam Question with Answer & Explanation

The correct answer is B: Bad or missing routes. With two upstream connections, intermittent access where some sites are reachable and others are not most likely indicates bad or missing routes causing traffic to be directed incorrectly depending on which path is selected.

Question

A user is on a network with two upstream connections to the Internet and is experiencing intermittent issues while connecting to websites. Some websites are available but others are not. Which of the following is the MOST likely cause of the condition?

Options

AIncorrect VLAN assignment
BBad or missing routes
CSwitching loop
DWrong subnet mask

Explanation

With two upstream connections, intermittent access where some sites are reachable and others are not most likely indicates bad or missing routes causing traffic to be directed incorrectly depending on which path is selected.

Common mistakes.

A. An incorrect VLAN assignment would prevent a device from communicating on the network at all or place it on the wrong segment - it would not cause selective website availability.
C. A switching loop causes broadcast storms that degrade or halt all network traffic uniformly - it would not result in only certain websites being inaccessible.
D. A wrong subnet mask causes issues communicating with hosts on specific subnets locally but does not selectively block external website access in a dual-WAN scenario.

Concept tested. Dual-WAN routing issues causing intermittent connectivity

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13751-23.html

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