An engineer must design a solution to provide backup connectivity between two sites. The engineer plans to use an Internet connection but company policy requires the connection to be encrypted. Additionally, there are several applications that utilize multicast to deliver video streams between the sites. Which technology should the design include?

Refer to the exhibit. An engineer is planning an IPv4 to IPv6 migration solution for a customer.
The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?

Which design principle involves redundancy through hardware, software, and connectivity?

A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS, and auto-summarization is disabled. Which two actions must the company choose? (Choose two.)

An engineer must design a large Layer 2 domain that contains hundreds of switches and VLANs.
The engineer's primary goals are to:
- Efficiently utilize the bandwidth of all links
- Avoid Layer 2 loops
- Cause minimal impact on switch CPU and memory
Which technology should the engineer include in the design?