First, fill in the blanket (1 point for each empty, a total of 30 points) 1, according to the transmission direction of the signal, according to the data communication mode is divided into <>, <>, <>. 2. In the management system of OSI, five management functions are defined, they are <>, <>, <>, <>, <>. 3, the connection service has the three phases of <>, <> and <>. 4, data communication refers to <>. 5. The function of computer network is mainly manifested in <>, <>, <>, <>. 6. TCP / IP system has four levels, which are <>, <>, <> and <>. 7. The meaning of ISDN is <>. 8. Bandwidth refers to <> in the analog communication, refers to <>. 9, NOVELL's NetWare operating system adopts NLM technology, NLM refers to <>. 10. Computer networks have different definitions in different periods, and is currently more consistent. 11. The main task of the physical layer is to determine the characteristics associated with the transmission medium, that is, <> characteristics, <> characteristics, <> characteristics and <> characteristics. 12, SNMP in the Internet refers to <>, PPP means <>.
Second, the choice questions (1 point for each question, a total of 20 points) 1, below the network topology is <>. A, star structure B, bus structure C, hierarchy D, mesh structure 2, the advantage of the packet switching method is <> compared to the circuit switching method. A, speed up the transmission speed B, improve the effective utilization rate of the line C, simple control, high reliability, good real-time 3, the Internet is the world's first large interconnection network, its prototype is <>. A, NCFC B, CERNET C, GBNET D, ARPANET4, and two computers transmit data signals using telephone lines, and its essential devices are <>. A, NIC B, Repeater C, Modem D, Coaxial Cable 5, whether it is SLIP or PPP protocols is the <> protocol. A, the physical layer B, the data link layer C, the network layer D, the transport layer 6, and the signal transmission is not required, it is not necessary to encode <>. A, analog data analog signal transmit B, analog data digital signal transmits C, digital data digital signal transmission D, digital data analog signal transmission 7, cable can be described with the maximum data transfer speed it can process. The data transfer speed is represented by the giga transferred per second. For example: 100BASE is a very ordinary type indicating that the cable is a baseband and can be transmitted at <> gabit per second. A, 10 B, 20 C, 50 D, 1008, and the repeater is a device applied in <> for extending the length of the physical line. A, physical layer B, data link layer C, network layer D, transport layer 9, about the Ethernet network card address correctly <>. A, unique B world, unique C around the world, unique D, not only 10 within a certain range, and the OSI reference model states correctly <>. A. Direct communication b between each layer, directly transmit data C, and data is always transmitted from the application layer to the physical layer D, and the data is always transmitted from the physical layer to the application layer 11, in the TCP / IP protocol concentration, < > The protocol is that each application must be used. A, TCP (Transmission Control Protocol) B, IP (Internet Protocol) C, UDP (User Data News Protocol) D, ARP (Address Resolution Protocol) 12, when there is an error in the receiving end, try to notify the sender to return, until The correct codeword received, this error control method is called <>. A, forward error correction B, automatic request re-circulation C, mixed error control D, redundancy inspection 13, physical layer adopt <> means to realize physical connections. A, physical device B, physical media C, transmission error control D, the four characteristics specified by the physical layer protocol 14, SNA is the network system in which <> launched. A, DEC B, IBM C, CCITT D, IEEE15, and PCM Modulation T1 link standard rate is <>. A, 1.544M B, 3.096M C, 2.048M D, 8000K16, the synchronization protocol in the data link layer protocol is the "main transmission information unit). A, message B, frame C, character D, bit 17, in the ATM network, ATM node <>. A, only the CRC check of the letterhead, do not do errors control B, do not do the CRC check, do not do error control C, do both the CRC check of the letterhead, also doing error control D, do not believe The head of the CRC check, only error control 18, Windows NT4.0 uses <> technology to achieve a platform across multiple CPUs. A, DLL B, NLM C, HAL D, NDIS19, in three types of network services, X.25 belongs to <>. A, type A, type C, C, C, C, cannot determine whether the host is up to the host in the TCP / IP application <> in the TCP / IP application. A, FTP B, TFTP C, PING D, REXEC
Third, calculation questions (10 points per question, a total of 20 points) 1, on the channel with a bandwidth of 64K, one of the four levels of the digital signal at any time, the largest data What is the rate? 2. If the generated polynomial is 10111, the information bit is 11111011, the cyclic redundancy bits are obtained, and the codeword formed after the information bits is applied, and the sequence of sequence is sent by HDLC (bit padding). Fourth, application questions (6 points for each question, a total of 30 points) 1. Analyze three retracted algorithms commonly used by CSMA technology; 2. Analyze the shortcomings of HUB in LAN; 3, what is ATM? What kind of connection is there? What is the characteristics? 4, what is the use of subnet mask? 5. It is determined which of the following IP addresses is invalid and explains the reason why it is invalid. 131.255.255.18 127.21.19.109 220.9.12.12 192.5.91.255 129.9.255.254 10.255.255.254--------------- ------------------------------------ Blog: Zhang Qingzhangking@263.net QQ: 9365822 MSN: ZhangKing@hotmail.com Personal: http://www.why100000.com ("100,000 Why" Computer Learning Network) Other Website: http://sogo99.com ("Sogou 99" network portal) http: // NETEYE.BLOGCHINA.com 2004.11.5
