题目内容

某公司的域名为xyz.edu.cn，所使用的网络地址为222.78.68.0/24，共有两台服务器，一台IP地址是222.78.68.10,名字是scrver1，它用作域名服务器、电子邮件服务器，另一台IP地址是222.78.68.11，名字是server2，它用作Web服务器。下面是服务器scrver1中的三个文件。 [/etc/named.conf文件的内容] options directory"/var/named"；；； zone"."IN type (1) ； file"named.ca"；； zone"0.0.127.in-addr.arpa"IN type master； file"named.local"; allow-updatenone；；； zone"xyz.edu.cn"IN type master； file"named.hosts"； allow-updatenone；；； zone" (2) "IN type master； file"named.rev"； allow-updatenone；；； [/var/named/named.hosts文件的内容] $TTL 86400 @IN SOA serverl.xyz.edu.cn. root.xyz.edu.cn．( 2001110600；serial 28800；refresh 14400；retry 3600000；expire 86400；minimum ) IN NS server1.xyz.edu.cn． IN MX 10 serverl.xyz.edu.cn． localhost. IN A 127.0.0.1 server1 IN A 222.78.68.10 server2 IN A 222.78.68.11 NW IN (3) [/var/named/named.rev文件的内容] $TTL 86400 @ IN SOA server1. xyz.edu.cn. root.xyz.edu.cn. ( 2001110600；serial 28800；refresh 14400；retry 3600000；expire 86400；minimum ) IN NS xyz.edu.cn． 10 IN (4) 11 IN PTR server2.xyz.edu.cn．该服务器是一个什么类型的域名服务器

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