协议工程考试-试题-2009-答案.docx

PAGE 1 of NUMPAGES 3 西安电子科技大学 考试时间 120 分钟 试 题 题号 I II III 总分 分数 1.考试形式：闭卷；2.本试卷共3大题，满分100分。 班级 学号 姓名 任课教师___________ I. Multiple Choices. （Notice: the mark M indicates more than one answers） (2×15 = 30) 1.The size of the mbuf structure is always______bytes. A.108 B.100 C.128 D.208 2. There are __ different types of mbufs?A. 1 B. 2 C. 4 D. 8 3. For a 1024-byte data, the m_flags in mbuf should be set to _____. (M) A. 0 B. M_PKTHDR C. M_EXT D. M_PKTHDR | M_EXT 4. To store a 200-byte data, how many mbufs are required？ A. 1 B. 2 C. 3 D. 4 5.The User Datagram Protocol is a _____protocol, and by default the UDP socket is termed____. A.transport-layer, unconnected B.IP-layer, connected C.transport-layer, connected D.IP-layer, unconnected 6. To end a connection, the client sends a ____? A. SYN B. ACK C. FIN D. RST 7.In IPv4, every IP address has_____bits, and in IPv6 the value is____. A.32, 32 B.32, 64 C. 64,64 D 64,32 8. A TCP message will be encapsulated as a/an ____ data. A. ICMP B. IP C. UDP D. link 9. TCP is a/an _____ layer protocol？. A. IP B. interface C. transport D. data link 10. The range of class C addresses is _______。 A. 128.0.0.0 to 191.255.255.255. B.127.0.0.0 to 191.255.255.255 C. 192.0.0.0 to 223.255.255.255 D. 192.0.0.0 to 224.255.255.255 11. IP address 128.0.0.1 belongs to class ___. A. A B. B C. C D. D 12. For the IP address 140.252.13.33 and mask 255.255.255.192, how many hosts are there in this subnet? A. 32 B. 31 C. 63 D. 64 13.As shows at below, which one is right? A. B. C. D. 14.When an Ethernet frame is received, the device driver calls the function ________ to create an mbuf chain and copy the frame from the device into the chain. A. m_devget B. m_pullup C. m_get D. m_retry 15. A standard IP header is____bytes long, so ip_hl must be greater than