电信笔试2（Telecommunication written test 2）.doc

电信笔试2（Telecommunication written test 2） Basic knowledge base of Telecom (the following topics to fill in the blanks, judgment or simply out, can also change after become choice) Choice question 1, the basic structure of communication networks in five forms, the following is the correct statement (C) A, network type, star type, tree type, ring type, bus type; B, net type, star type, line type, compound type, ring type; C, mesh type, star type, composite type, ring type, bus type; D, mesh type, ring type, linear type, compound type and tree type. 2, N nodes fully interconnected network type network, the number of transmission lines required (D) A, N (N-1), B, N C, N-1, D, 1/2*N (N-1) 3, the measure of digital communication system transmission quality index is (A) A, bit error rate B, signal-to-noise ratio C, noise power D, speech intelligibility 4, the following about various types of routing characteristics of the statement, which is incorrect (B) A, routing order is the first choice, followed by a circuitous route, direct routing backbone route again; B and efficient direct routing can not exceed 1% of the call loss, and the route allows traffic to overflow to other routes; C, low loss direct routing does not allow traffic to spill over to other routes; D, a bureau can set multiple routes. 5, the message passing section is three functional levels, and the correct statement is (D) A, the first level is the data link function level, the second level is the signaling network function level, and the third level is the signaling link function level; B, the first level is the signaling link function level, the second is the data link function level, and the third is the signaling network function level; C, the first level is the signaling network function level, the second is the data link function level, and the third level is the signaling link function level; D, the first level is the data link function level, the second level is the signaling link function level, and