N10-005 · Question #783
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 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
How the community answered
(57 responses)- A11% (6)
- B82% (47)
- C5% (3)
- D2% (1)
Why each option
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.
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.
In a dual-WAN environment, each upstream connection may have different routing tables. If routes are missing or incorrect, traffic destined for certain destinations will be sent out the wrong interface or dropped, causing some sites to be reachable (via the correct path) while others are not, which matches the intermittent, destination-specific symptom described.
A switching loop causes broadcast storms that degrade or halt all network traffic uniformly - it would not result in only certain websites being inaccessible.
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
Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13751-23.html
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