计算机网络英文试题.doc

/bbs Computer Network Test Paper Who invented IP and some related Internet protocols? B Vinton Cerf and Bob Metcalfe Vinton Cerf and Robert Kahn Bob Metcalfe and Ivan Sutherland Bob Metcalfe and David Clark In the OSI reference model, The upper layers of the OSI model are, in correct order B Session, application, presentation Session, presentation, application Session, application, presentation, physical Application, presentation, session The lower layers of the OSI model are, in correct order D physical, system, network, logical physical, logical, network, system physical, transport, network, data link physical, data link, network, transport The Internet Protocol (IP) generally corresponds to which OSI layer? A Network (layer three) Transport (layer four) Data link (layer two) Session (layer five) MTU stands for C Minimum Transfer Unit Minimum Transmission Unit Maximum Transmission Unit Maximum Transfer Unit What layer of the OSI model is designed to perform error detection functions? B Physical Data link Network transport Which of these network devices primarily functions at the OSI Network layer (layer 3)? C Switch Gateway Router All of the above What is the size of today’s standard (IPv4) IP address? A 4 bytes (32 bits) 12 bytes (96 bits) 15 bytes (120 bits) 16 bytes (128 bits) What is the size of the next-generation (IPv6) IP address? 4 bytes (32 bits) 12 bytes (96 bits) 15 bytes (120 bits) 16 bytes (128 bits) Which of the following higher-level protocols runs over IP? D FTP HTTP SMTP All of the above Which of the following IPv4 addresses is the loopback address? C 55 Which of the following IPv6 addresses is the loopback address? B 0::0 0::1 127::0 127::1 The length of an IP datagram header can vary depending on the options used. What is the smallest possible IP header size? B 16 bytes 20 bytes 24 bytes 60 bytes The source IP address for an IPv4 datagram is stored where in the header? C 2nd longword (bytes 5-8) 3rd longword (bytes 9-12) 4rd long