单项选择题 How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates？（）

多项选择题 Which routing protocols will support the following IP addressing scheme? （） Network 1 - 192.168.10.0 /26 Network 2 - 192.168.10.64 /27 Network 3 - 192.168.10.96 /27 Network 4 - 192.168.10.128 /30 Network 5 - 192.168.10.132 /30

单项选择题 Acknowledgements, sequencing, and flow control are characteristics of which OSI layer（）。