Go back to 642-770 - Operational Foundations for Cisco Service Provider Core Networks

Question :-

You have built a new facility and are now testing connectivity. All routers at the new facility can ping their directly connected neighbors, but cannot ping any other routers. Which statement is true?
A layer 1 issue at the facility prevents all other layers from operating.
Layer 1 is operational, but an issue with layer 2 causes frame errors.
Layer 2 is operational, but layer 1 issues prevent packet forwarding.
Layers 1 and 2 are working properly, but layer 3 needs more information to forward packets.

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