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Which bit should be set in the link-state PDU of an IS-IS L1/L2 router to indicate that it is a potential exit point of the area?
Correct Answer: B
Explanation/Reference: Explanation: Default routing is achieved in two distinct ways with Integrated IS-IS: Attached bit--Set by a Level 1/Level 2 router in its own Level 1 LSP and used to indicate to all Level 1 routers (within the area) that this router is a potential exit point of the area. Level 1-only routers will default to the nearest attached Level 2 router. Default information originate--Can be configured in Level 1 as well as Level 2. The default route (0.0.0.0/0) is inserted in the router LSP (Level 1 or Level 2, according to the configuration command) and the LSP is flooded according to the router type (Level 1 or Level 2). A Level 2 router doesn't need to have a default route to originate a default route. Reference. http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml