2015复习参考

Chapter 8 Network Securitywork security problems can be divided roughly into four areas:___________________monly-used encryption algorithms include__________ and ___________3.What is digital signature’s functions?4.What is firewall? Two classes .Chapter 7 The application layer1. What is DNS2. How to carry out domain name resolution.3. In E-mail, which protocols are used for message transfer and final delivery?4. If you want to display the selected page, which questions must be solved before?5. WWW stands for_____6. Commonly used video compression standards include__________.7 . What is voice over IP, what is H.323, what is SIP?Chapter 5/6 network layer and transport layer1. In the TCP/IP Architecture , there four layers ,they are _____,_________,________ and ________. P5732. IP Packet consists of header and user data, IP packet header includes fixed 20 byte header and variable options , it will not exceed 60 bytes. How to judge which class an IP address belongs to. How many classes IP addresses are there in IPV4?3. In IP packet header, fields related to fragmentation and reassembly include Identification , flags, fragment offset, source IP address and destination IP address. Understanding each field’s meaning of IP header.4. In one node , a packet with following header(0x) 4500 0054 0003 0000 0C06 0000 7C81 0E0F 6F7E 0506 is received:(1)Are there any options in this packet? IHL=5, so header length=20, no option(2)Is this packet fragmented? Last fragment , offset=0, not fragmented(3)What is user data length? 5ⅹ16+4-20=64(4)Source IP address(dotted decimal notation)? (7C 81 0E 0F->124.129. 14.15)(5)Destination IP address(dotted decimal notation)?(6F 7E 05 06->111.126.5.6)5. For one of classes A,B and C networks, how many hosts are accommodated respectively? (You should can identify what class IP address is according to some rules) three types of address in internet( mac addr, IP addr, port #)6. Subnet Addressing Example on page 439.(In one subnet, please pay attention to subnet addresses range, how to decide subnet mask)7. How to fragment a packet8. What characteristics do the UDP and TCP have respectively?9. Understanding the flow control mechanism in TCP.10. In the TCP segment, what does MSS stands for?11. In the TCP congestion control, which three phases are included ? Explain them in detail.12. How to judge that congestion has happened?13. What is three-way handshake and what is a graceful close?14 How to get its network address, when one host address is known.15 For a two-way TCP connection, it is possible that there can be multiple segments exchanged, please pay attention to the parameters used.16. The segment with SYN set to 1 use up one sequence number(its length is 1), the same with the segment with FIN set to 1.17. The segment with ACK set to 1 don’t use up sequence number when no data is carried.18. Please pay attention to Sequence number wraparound problem.19. IP address’s dotted decimal notation.20. Designing subnets and deciding the host range of each subnet, given a network address and the number of subnets.21. TCP/IP protocol suite’s hour glass model (shape)22. What is flow control? What measures are applied in TCP’s flow control?23. How to provide TCP’s reliability.24.Why is fragmentation applied to IP datagram? Where does it take place?25. How to forward a packet under the CIDR.26.Two classes of network service are ___________ and __________.27 .Internal network operation includes datagram and virtual circuit.pared with message switching, packet switching has less time delay and less transmission overhead when transmission error exists. Comparing them with each other by drawing.29.A packet switch or router consists of line cards, controller and interconnection fabric.30.The goals a routing algorithm should seek include: 1)rapid and accurate delivery of packets.2) adaptability to changes in network topology resulting from node or link failure.3) adaptability to varying source-destination traffic loads.4) ability to route packet away from temporarily congested links.5) ability to determine the connectivity of the network.6)ability to avoid the routing loops.7)low overhead.31.routing algorithm’s classification: static or dynamic, centralized or distributed, specialized routing(flooding , deflection routing)Why Hierarchical Routing is applied in the Internet?32. the Bellman-Ford algorithm, , RIP routing protocol. An distributed routing.33. Dijkstra’s algorithm, example , ospf routing protocol. Centralized routing.Chapter 4 Medium Access Control Sub-layer.1.In multiple access communications, there two broad categories of scheme for sharing atransmission medium.2.what is Delay-Bandwidth Product and what is normalized delay-bandwidth product?3.In random access, there are ALOHA, slotted ALOHA, CSMA and CSMA/CD, CSMA/CA4.In scheduling approaches, there are reservation system and polling.5.In LAN , data link layer is divided in two sublayers, their respective functions.6.what is 802.3 LAN standard?7.Ethernet’s development8.In 802.11, understanding the following basic concepts: BBS, DS, ESS, AP9.In 802.11’s MAC sublayer, there are DCF and PCF.10.In 802.11, there are two carrier sensing methods.11.What is CSMA/CA?Chapter 3 The Data Link Layer1.What is the service model? There are two classes:_______________2.What is End to End and What is Hop by Hop?3.Three types of ARQs and their applications4.The principles of three types of ARQ. The relationship between Sending window andreceiving window.5.Two typical data link layer protocols: HDLC and PPP6.HDLC’s three types of frame and HDLC is a bit-oriented protocol.7.Bit stuffing and bit destuffing.8.PPP is the most popular data link layer protocol.Chapter 2 The physical Layer1. In transmission system, Multiplexing includes FDM,TDM, WDM2. Which media are used in information transmission?3. For wireless transmission, you should know 1)the electomagnetic spectrum2)radio transmission 3) microwave transmission 4)infrared and millimeter waves5) light-wave transmission4. Communication satellite’s types( geostationary satellite, medium-earth orbit SALow-Earth orbit SA)5.Understanding the telephone network’s structure.6. Three different switching methods( ms, cs ps)7. The mobile telephone system’s development.8. Knowing something about Internet over CableChapter 1 Introduction1. what is network’s architecture?2. what are relationships among protocol, service and layer?3. what is service user and what is service provider?4. What is IS O’s OSI RM and how many layers does it include?(each layer’s functions)5. Commonly-used application layer protocols and transport layer protocols.6. what is encapsulation and what is de-capsulation?7. In IS O’s OSI RM, what is each layer’s protocol data unit?。