Cisco Certified Network Associate (CCNA) Practice Exam

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What is the logical port number used by GLBP?

UDP 1234
UDP 2222
UDP 3222
UDP 4321

The correct answer is: UDP 3222

The correct logical port number used by GLBP (Gateway Load Balancing Protocol) is UDP 3222. GLBP allows multiple routers to work together to present a single virtual gateway to hosts on a local area network. When one of the routers serves as the active virtual gateway (AVG), it uses UDP port 3222 to communicate with other routers in the GLBP group. This port is specifically chosen for GLBP traffic to ensure it is distinguished from other protocols and interactions on the network. The other port numbers listed do not correlate with GLBP operations. They may belong to different services or protocols, but for GLBP functioning and communications, UDP port 3222 is the standard used within the context of Cisco's implementation.