天津理工大学计算机网络期末考试复习提纲带答案

单选题/填空题：

1. CIDR address 无类域间路由地址(P227-229)

2. UDP 用户数据报协议（P132-135）

3. TCP retransmission TCP重传(P163-167, 3.5.4)

4. IP address header length IP地址首部长度(40 bytes)

5. IP header field IP地址首部(P221-225)

6. network edge and network core 网络边缘与网络核心（P6-22, 1.3-1.4）

7. transmission delay 传输时延:d/s

8. application protocols(underlying transport protocols) 基于运输层的应用层协议（TCP、UDP）

9. transport protocols and port numbers of some application protocols 运输层协议、应用层协议及端口号

10. TCP segment structure and UDP segment structure TCP（P157-158）、UDP报文结构（P135，3.3.1）

11. IPv6 address IPV6地址（P238-242）

12. MAC address MAC地址（P307-308）

13. Ping

14. Traffic intensity 流量强度(P28)

15. HTTP status code HTTP状态码(P71)

简答题：

1. The two key function of network layer (routing and forwarding) 网络层两个核心功能（转发与选路）forwarding: move packets from router’s input to appropriate router output.

routing: determine route taken by packets from source to dest.

2. The layers of a DNS server DNS服务器分层结构

root name server、top-level domain (TLD) server、authoritative DNS server、Local DNS name server

3. Routing to another LAN by knowing IP address(ARP, Ethernet work) (P309-314)

已知IP地址，选路到另一个局域网

掌握ARP工作原理，掌握在同一子网中ARP是如何工作的，中间经过路由器是如何工作的。

4. pipelined protocol and stop-and-wait protocol 流水线协议与停等协议（P138-147）

掌握RDT2.0、3.0和流水线的工作方式以及效率。

5. OSI architecture OSI参考模型有哪几层？每层的功能是什么？

application: supporting network applications

presentation: allow applications to interpret meaning of data

session: synchronization, checkpointing, recovery of data exchange

transport: process-process data transfer

network: routing of datagrams from source to destination

link: data transfer between neighboring network elements

physical: bits “on the wire”

6. The difference between pure ALOHA and CSMA 纯ALOHA协议与CSMA协议的区别

Pure Aloha: simpler, no synchronization. When frame first arrives, transmit immediately. But collision probability increases: frame sent at t0 collides with other frames sent in [t0-1,t0+1]

CSMA: Listen before transmit: if channel sensed idle, transmit entire frame; if channel sensed busy, defer transmission.

综合题：

1. TCP congestion control TCP拥塞控制(P181-186)

2. Dijkstra’s shortest-path algorithm Dijkstra最短路径算法(4.5.1 P246-247)

3. Protocol analyze (how each layer of TCP/IP works if we use http or ftp )

协议分析，自顶向下分析HTTP/FTP工作原理（全书综合）