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3. A VPN is private in that the traffic is encrypted to keep the data confidential while it is transported across the public network. Site-to-site IPsec VPNs and GRE over IPsec are not sufficient when the enterprise adds many more sites. Describe one of the possibility solution to address this issue. [6 marks] 4. The QoS policy implemented by the network administrator becomes active when congestion occurs on the link. Queuing is a congestion management tool that can buffer, prioritize, and, if required, reorder packets before being transmitted to the destination. i. Explain the operation of Low Latency Queuing (LLQ].[4 marks] ii. List other three [3] queuing algorithms apart from [i].[3 marks] iii. Describe any one of the three [3] types of delay: Packetization delay, Propagation delay, De-jitter delay.[3 marks]