计网实验二(2)

DNS响应报文 Identification Flags Number of Questions Number of answer RRs Number of authority RRs Number of additional RRs Queries Answers 5 5 www.http://www.wodefanwen.com/: type A, class IN www.http://www.wodefanwen.com/: type CNAME, class IN, cname www.a.shifen.com www.a.shifen.com: type A, class IN, addr 119.75.217.56 www.a.shifen.com: type A, class IN, addr 119.75.218.77 a.shifen.com: type NS, class IN, ns ns1.a.shifen.com a.shifen.com: type NS, class IN, ns ns5.a.shifen.com a.shifen.com: type NS, class IN, ns ns4.a.shifen.com a.shifen.com: type NS, class IN, ns ns2.a.shifen.com a.shifen.com: type NS, class IN, ns ns3.a.shifen.com ns4.a.shifen.com: type A, class IN, addr 115.239.210.176 ns2.a.shifen.com: type A, class IN, addr 180.149.133.241 ns5.a.shifen.com: type A, class IN, addr 119.75.219.43 ns1.a.shifen.com: type A, class IN, addr 61.135.165.224 ns3.a.shifen.com: type A, class IN, addr 61.135.162.215 0xf23e 0x8180 1 3 Authoritative Servers Additional records 6

检查DNS查询响应报文，其中提供了多少个“answers”？每个answers包含哪些内容？ 该DNS响应报文提供了3个“answers”，内容如下： 1、Name: www.http://www.wodefanwen.com/

Type: CNAME (Canonical NAME for an alias) (5) Class: IN (0x0001) Time to live: 819 Data length: 15

CNAME: www.a.shifen.com 2、Name: www.a.shifen.com Type: A (Host Address) (1) Class: IN (0x0001) Time to live: 191 Data length: 4

Address: 119.75.217.56 (119.75.217.56) 3、Name: www.a.shifen.com Type: A (Host Address) (1) Class: IN (0x0001) Time to live: 191 Data length: 4

Address: 119.75.218.77 (119.75.218.77)

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