网络安全技术习题答案（Network security technology exercises answer）.doc

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网络安全技术习题答案（Network security technology exercises answer）.doc

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网络安全技术习题答案（Network security technology exercises answer）

网络安全技术习题答案（Network security technology exercises answer） What is the difference between the OSI reference model and the tcp/ip reference model? Answer: 1, hierarchical model is different. The TCP/IP model does not have a session layer and a presentation layer, and the data link layer and the physical layer are one. 2, OSI model has 3 main concepts: service, interface and protocol. The TCP/IP reference model is not very clear about the difference between the three. 3, TCP/IP model is more reasonable than OSI model for heterogeneous network interconnection. 4, TCP/IP model pays more attention to connectionless service than OSI reference model. In the transport layer of the OSI model only for connection of communication, while the TCP/IP model supports two communication modes; in the network layer of the OSI model for connectionless and connection oriented mode, while the TCP/IP model only supports connectionless communication mode. Test model similarities and differences, reference model similarities and differences Two. Briefly describe the structure of the certification center CA and the functions of each part (p167 pages) Three. What is a bastion host? Answer: is a bastion host by strengthening the defense can attack the computer as a check point into the internal network, in order to achieve the security of the entire network in a centralized host address, thus saving time, without considering other host security purposes. The bastion host is the most vulnerable host in the network, so the bastion host must also be the most perfect host. A bastion host uses two network cards, each of which connects different networks. A network card connects your companys internal network for management, control, and protection, while the other connects to another network, usually the public network, or Internet. Bastion hosts often configure gateway services. The gateway service is a process to provide routing of special protocols from the public network to the private network, a