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What is true about the use of frame-relay point-to-multipoint subinterfaces?
They require a separate subnet within a routing domain
They act as NBMA frame-relay interface, so routing update traffic is subject to the split horizon rule
They emulate serial leased lines
They are not subject to the split horizon rule
A point-to-multipoint frame-relay subinterface is the default behavior for all serial interfaces on a cisco router. Multiple IP addresses can be configured on a single subnet within a routing domain, and act as NBMA frame-relay interface (which routing update is subject to the split horizon rule). (Cisco Frame Relay Solutions Guide by Jonathan Chin)
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