文档内容包括题目要求，源代码和运行结果截图以及文件截图 复制即可运行 适合学习编译原理的初学者 从源程序文件中读取有效字符流并将其分析识别单词符号，转换成二元组内部表示形式输出。 主程序的说明部分为各种表格和变量安排空间（关键字和特殊符号表）。 id 和ci 数组分别存放标识符和常数；还有一些为造表填表设置的变量。 主程序的工作部分建议设计成便于调试的循环结构。每个循环处理一个单词；调用词法分析过程；输出每个单词的内部码（种别编码，属性值）。建议从文件中读取要分析的符号串。

实验报告包含详细的实验截图和命令 Task 1: Configure Local AAA Authentication for Console Access on R1 Step 1. Test connectivity. · Ping from PC-A to PC-B. · Ping from PC-A to PC-C. · Ping from PC-B to PC-C. Step 2. Configure a local username on R1. Configure a username of Admin1 and secret password of admin1pa55. Step 3. Configure local AAA authentication for console access on R1. nable AAA on R1 and configure AAA authentication for console login to use the local database. Step 4. Configure the line console to use the defined AAA authentication method. Enable AAA on R1 and configure AAA authentication for console login to use the default method list. Step 5. Verify the AAA authentication method. Verify the user EXEC login using the local database. Task 2: Configure Local AAA Authentication for VTY Lines on R1 Step 1. Configure a named list AAA authentication method for VTY lines on R1. Configure a named list called TELNET-LOGIN to authenticate logins using local AAA. Step 2. Configure the VTY lines to use the defined AAA authentication method. Configure the VTY lines to use the named AAA method. Step 3. Verify the AAA authentication method. Verify the Telnet configuration. From the command prompt of PC-A, Telnet to R1. Task 3: Configure Server-Based AAA Authentication Using TACACS+ on R2 Step 1. Configure a backup local database entry called Admin. For backup purposes, configure a local username of Admin and secret password of adminpa55. Step 2. Verify the TACACS+ Server configuration. Select the TACACS+ Server. From the Config tab, click on AAA and notice that there is a Network configuration entry for R2 and a User Setup entry for Admin2. Step 3. Configure the TACACS+ server specifics on R2. Configure the AAA TACACS server IP address and secret key on R2. Step 4. Configure AAA login authentication for console access on R2. Enable AAA on R2 and configure

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