EDITORIAL: 2019 North 801 recalls a multiple-choice part of the network version, entitled troubled by this review when I had for a long time, if the title is no problem, I want to give myself a little humble opinion, because there is no answer, so welcome to the discussion .
About NAT protocol, the following statements is correct
A. NAT can be used to assign IP within the network to host
B. When NAT can communicate with the outside world as a proxy server within the network host
C. as a domain name server
D. can be used as a local gateway
BD mainly two, Wei Yan teacher of translation and other computer network fifth edition, pointed out that the gateway is the router's old name (p332), I tentatively as the D option, NAT router as a local router. The packet forwarding Xie Xiren version 7 of the book process, host to the Internet (outside the local area network) must be the local router, NAT and the main role of the Internet is to meet the needs of network users. I think as long as the local router should be able to route it. Look B option, NAT / NAPT principle role is to use NAT translation table to use public IP, in any case work at the network layer (NAPT is not very strict, but count up to the transport layer of it), and did not reflect the server functionality. In fact, I do not understand the exact definition of a proxy server, wiki explanation seems to be vague, but in general must work at the top. For comparison DHCP server is a response to the address assigned to the client and to work, and here I have a doubt, this mechanism can not be achieved within the networked interconnection of it? Or DHCP server within the network can not be used as a proxy server host it? Pending further study.
Some tips: This question is of course concerned, duck time consuming having to go into a dead end, after all, the integrity of the correctness of the subject can not be guaranteed. But even the basics need to spare to think, in the previous study, always thinking that the ability to accept relatively strong, in fact, but the others did not learn in depth and carefully. Inquisitive, or ask the basics, I hope this will not be so anxious, non-talent-type players or step by step faster.
