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Which of the following Layer 2 protocols provide faster convergence time after a link failure?
STP
RUDP
VTP
RSTP
Compared to the legacy STP (802.1D) which takes about 50 seconds to converge by default, RSTP can converge in less than 1 second. VTP is a trunking protocol which reduces management efforts in a switched network. RUDP (Reliable UDP) is a transport layer protocol used for data communication. (http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html)
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