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» Cisco » Examen Cisco CCNA V3.1 » Module 3 » Chapitre 7 » Question 20/24

20.What characteristic of Ethernet makes a redundantly switched network prone to loops?

Routers are only able to prevent loops at Layer 3, while Ethernet exists at Layer 2.
The Ethernet protocol has no TTL mechanism.
Switches lack the sophisticated software required to prevent loops.
Looping of frames is a reliability mechanism built in to the Ethernet protocol.