問題文
An operator has to size the counter of a firewall filter that watches OSPFv2 protocol traffic on a busy area, and needs to know which destination the packets that carry advertisements are addressed to and how many packets come back to answer them. Which statement describes what the documentation says about those two kinds of packet?
選択肢
- Advertisements are addressed to one neighbor at a time on every kind of network, and one packet that answers them can cover several of the packets that carried advertisements, so the filter reads more of the first kind than of the second.
- Advertisements are flooded to a multicast destination, a copy that has to be sent a second time is addressed to one neighbor, and one packet of the kind that answers them can cover several of them.
- Advertisements are addressed to one neighbor at a time on every kind of network, and one packet that answers them is sent for each of them.
- Advertisements are flooded to a multicast destination, a copy that has to be sent a second time goes to that same destination again, and one packet that answers them is sent for each packet that carried advertisements, which leaves the two counts of the filter equal.