Begging China Telecom to recruit written test questions in recent years (computer-related)

First, multiple-choice questions (this big question * * 10 small questions, 5 points for each small question, 50 points for * * *)

A little. . . . . . . . . It's simple. All are foundations!

II. Fill in the blanks (this big question * * 10 small question, 2 points for each small question, 20 points for * * *)

Please fill in the correct answers in the blanks of each question. You don't score if you fill it wrong or not.

16. There are two types of LAN transmission: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

17. In token ring network, token ring has two frame formats, namely _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

18.DDN is a fully transparent network, which uses _ _ _ _ _ _ _ _ _ _ multiplexing technology when the user rate is lower than 64kb/s; _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

19. The computer network system consists of _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _.

20. Frequency division multiplexing is applicable to _ _ _ _ _ _ _ _ _ _ _ _ signals, and time division multiplexing is applicable to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

2 1. According to the different hub structures, hubs can be divided into independent hubs, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

22. Traditional encryption methods can be divided into _ _ _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _.

23. In OSI/RM, _ _ _ _ _ _ _ _ _ is located at the highest level of the communication subnet, while _ _ _ _ _ _ _ _ is located at the lowest level of the resource subnet.

24. In the application layer of OSI/RM, application service elements can be divided into _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _ _.

25. In serial transmission, there are _ _ _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _.

Three, short answer questions (this big question ***6 small questions, each small question 5 points, ***30 points)

26. In the IEEE802 LAN reference model, which two sublayers can the data link layer be divided into? What are their functions?

27. Briefly describe the relationship and differences between OSI services and protocols.

28. Briefly describe the hierarchical structure of TCP/IP layered model and the main functions of each layer.

29. What are the basic functions involved in the network management function?

30. Briefly describe the composition and characteristics of network software.

3 1. What are error detection codes and error correction codes?