I don't know my problem belongs to which category, if you have sent the wrong place, help to correct, thank moderators and administrators. Hard.



Question 1: why when nic to determine which network card, which is equivalent to judge should have the package sent to a router?

"How is the network connection" on page 104:
Paragraph: IP header need to fill in the IP address of the sender, many will be installed on the server nic, have multiple IP addresses, then a computer when the sender IP address which will need to determine what should fill in the address. in a multiple network card this judgment is equivalent to determine which network card should be used to send this package. Also is equivalent to determine which router should put the package of the French open, so as long as the relevant target routers, also determine which network card should be used, also determine the IP address of the sender.

Question 2: the routing table is not in the router? In the operating system? If in the operating system, that is what is called the routing table?
Question 3: the operating system in the routing table is where come of? Computer when taken from the network card in the driver? Or from the router? Or the operating system comes?


Question 4: why are the values in the ARP cache will be deleted after over a period of time? (the red bold; How to solve this?? ARP cache is not the IP address and MAC address one-to-one form? So that, in a new IP address, not to find MAC on table? Find value, can't find the radio; Why can't and real occurrence difference?? )

"How is the network connection" on page 110:
Paragraph: the ARP cache, we can the number of ARP packets, but if you always use the address in the ARP cache will create problems. when the IP address changes, for example, the content of the ARP cache will and real difference . In order to prevent the happening of this kind of problem, the values in the ARP cache will be deleted after a period of time...

Question 5: the network card can support various types of bags, such as what? (TCP/IP is not contains all the package?)

Thank you Daniel teachers,
Small hobby, never on the communications professional class;
Please recognize that easy to understand as far as possible, less specialized vocabulary.. Thank you...