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### Instruction:
What is the purpose of virtual links in OSPF?
### Response:
Virtual links are used to connect an area that does not have a direct physical connection to the backbone (Area 0). The virtual link provides a logical path to the backbone through another area. This is commonly used if a new area is introduced that cannot have a direct link to the backbone. The virtual link is configured on the Area Border Routers (ABRs) on both ends of the link.
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