Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Interesting ports on server2.arrk.local (192.168.0.253):
(The 1581 ports scanned but not shown below are in state: closed)
Port State Service
21/tcp open ftp
27/tcp open nsw-fe
88/tcp open kerberos-sec
110/tcp open pop-3
119/tcp open nntp
135/tcp open loc-srv
139/tcp open netbios-ssn
143/tcp open imap2
389/tcp open ldap
445/tcp open microsoft-ds
464/tcp open kpasswd5
593/tcp open http-rpc-epmap
636/tcp open ldapssl
1026/tcp open LSA-or-nterm
1029/tcp open ms-lsa
1109/tcp open kpop
2301/tcp open compaqdiag
3372/tcp open msdtc
5800/tcp open vnc-http
5900/tcp open vnc
Nmap run completed -- 1 IP address (1 host up) scanned in 0 seconds
其实我也知道点、下面我对知道的做注解、我不知的，请帮助，谢谢
21/tcp open ftp FTP服务器 如不用可关了
27/tcp open nsw-fe
88/tcp open kerberos-sec
110/tcp open pop-3 邮件服务器 如不用可关了
119/tcp open nntp 网络新闻传输协议
135/tcp open loc-srv
139/tcp open netbios-ssn
143/tcp open imap2
389/tcp open ldap
445/tcp open microsoft-ds
464/tcp open kpasswd5
593/tcp open http-rpc-epmap
636/tcp open ldapssl
1026/tcp open LSA-or-nterm
1029/tcp open ms-lsa
1109/tcp open kpop
2301/tcp open compaqdiag HP服务器管理用的
3372/tcp open msdtc
5800/tcp open vnc-http VNC远程控制
5900/tcp open vnc VNC远程控制
特别请教：88/tcp open kerberos-sec 是什么功能，如在本服务器上关了，有什么问题吗？