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The purpose of a network（ ）is to provide a shell around the network which will protect the system connected to the network from various threats.
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The purpose of a network（ ）is to provide a shell around the network which will protect the system connected to the network from various threats.
A、firewall
B、switch
C、router
D、gateway
时间：2022-01-02 09:03
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A
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（）is not a physical wall, but a lot of virtual data to protect the computer network.
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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（3）处应选择（）
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（5）处应选择（）
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