Which of the following is a Cisco proprietary protocol?
a. DCP
b. DTP
c. VTP
d. Both a and b
e. Both b and c
e. Both b and c
Explanation: Dynamic Trunking Protocol (DTP) is used to automatically negotiate a switch port to be either an access port or a trunk port. Virtual Trunking Protocol (VTP)is a Layer 2 messaging protocol used to automatically add, delete, and rename VLANs on a network-wide basis, which allows for consistent VLAN configuration across all switches on the network. There is no DCP, but CDP (Cisco Discovery Protocol) is also Cisco proprietary.
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