An internet is a combination of networks connected by (1). When a datagram goes from a source to a  (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a  (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?

空白（2）处应选择（）

[单选题]A．n internet is a combination of networks connected by()A．modemsB．routersC．switchesD．computers

[单选题]A．n internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and pas

[单选题] An internet is a combination of networks connected by （71） . When a datagram goes from a source to a （72） , it will probably pass many （73） until it reaches the router attached to the destination network. A router receives a （74） from a network and

[单选题]The Internet is a(66)network of networks which interconnects(67)ranging from the simplest personal computers to the most sophisticated mainframes and supercomputers. This network of networks is used for an extraordinary range of purposes - long dista

[单选题]The Internet is a （）system of interconnected computer networks that use the

[单选题](75) is the combination of computer and video technology.(75)A．MultimediaB．DisplayC．CommunicationD．Internet

[单选题]Business risk is the combination of:A.Operating risk and financial risk.B.S

[单选题]Wireless telecommunications networks are generally implemented and administered using（）communication.This implementation takes place at the （）level of OSI model network structure.A．microwave B．radio C．FM D．AMA．physical B．link C．network D．transport

[名词解释] 荷载组合（load combination）

[单选题]The(71)is a combination of keys that allows the user to activate a program function without clicking a series of menus options.(71)A.shortcut-keyB．quick-keyC．fast-keyD．rapid-key