In the OSI reference model, what can complete end-to-end error detection and flow control?

As shown in the figure, RTA uses NAT technology and realizes multiple-to-multiple NAPT address translation by defining an address pool, so that hosts in the private network can access the public network. Suppose that there are only two public IP addresses in the address pool, and they have been assigned to hosts A and B for address conversion, and if host C also wants to access the public network, which of the following description is correct?

The role of telnet.read_all() in Telnetlib is to read all data until EOF. If the echo does not return EOF, it will always be blocked.

Among the following commands to configure the default route, which one is correct?

Which of the following statements is correct?