CCNA Data Center Question of the Week: Layer 2 Features

Answer: A, D and E.

PIM is protocol-independent multicast and can leverage whichever unicast routing protocols are used to populate the unicast routing table for forwarding IPv4/IPv6 based multicast traffic. The protocols that could populate the unicast routing table include Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), Routing Information Protocol (RIP) and static routes. Hot Standby Router Protocol is in a classification of protocols called First Hop Redundancy Protocols (FHRP) and are used to automate the concept of redundant routers for IPv4 and IPv6.

Unidirectional Link Detection adds a layer 2 keep alive to determine if there is a lyer1 or layer 2 failure between UDLD peers.STP is Spanning Tree protocol, for layer 2 loop prevention. Cisco Discovery Protocol is a layer 2 protocol that advertises the type of Cisco device it is, versions of code running, addressing configured on the outward facing interface (as well as other items).