問題文
The same pair of routers cannot use the address resolution path at all, and the design falls back on another way of learning where to send frames. An engineer has to record where a learned hardware address can be taken from, and what has to hold when one of the two uses a resolution method of its own making. Which statement is correct?
選択肢
- It can be taken from the data-link frame that carried a routing protocol packet from the far side, and both routers have to be able to use that same method of their own making.
- It can be taken from the reply to an address-resolution request sent to the far side, and the link falls back to the ordinary multi-access model on its own when the method is one of their own making.
- It can be taken from the reply to an address-resolution request sent to the far side, and both routers have to be able to use that same method of their own making.
- It can be taken from the data-link frame that carried a routing protocol packet from the far side, and the link falls back to the ordinary multi-access model on its own when the method is one of their own making.