What are two reasons to select OTV as the DCI solution to connect multisite topologies? (Choose two.)
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A. B. C. D. E.BC.
https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.htmlOTV or Overlay Transport Virtualization is a Cisco technology that provides Layer 2 extension and connectivity between multiple data centers, while keeping the data center's Layer 3 network separate. It provides the ability to extend VLANs across multiple sites, without the need to readdress or redesign the existing network infrastructure. Here are the two reasons to select OTV as the DCI solution to connect multisite topologies:
A. It propagates hosts reachability without support of traffic flooding:
OTV provides a mechanism for flooding broadcast, unknown unicast, and multicast traffic over the IP network, without flooding the entire network. This is achieved by encapsulating the Layer 2 frames inside IP packets and sending them to the remote site. The remote site then decapsulates the frames and forwards them to their destination. This mechanism allows OTV to propagate hosts' reachability information across the sites, without the need for traffic flooding.
B. Layer 3 failures do not propagate beyond the OTV edge device:
OTV provides isolation between the Layer 2 networks at each data center and does not propagate Layer 3 failures beyond the OTV edge device. This means that if there is a Layer 3 failure at one data center, it will not affect the other data centers connected via OTV. This provides better network availability and reduces the risk of downtime.
C. It extends the spanning tree between data centers:
This statement is incorrect as OTV does not extend the spanning tree between data centers. Instead, it uses a different mechanism to provide Layer 2 extension and connectivity between multiple data centers.
D. It is an open standard:
This statement is also incorrect as OTV is not an open standard. It is a Cisco proprietary technology that requires specific hardware and software to be deployed.
E. It constrains HSRP hello messages to each data center:
This statement is also incorrect as HSRP (Hot Standby Router Protocol) is a Layer 3 protocol used for providing redundancy in a network. It is not directly related to OTV, which is a Layer 2 technology.