几道红皮书问题，那位高手能解答一下

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几道红皮书问题，那位高手能解答一下

马上要去考236了，几道红皮书上的问题还不明了，请高手解答一下：
1. Which one of the following will result from an adapter configuration of
ifconfig en0 129.35.22.8 network 255.0.0.0?
A. Destination Gateway 129.0.0.99 129.35.22.8
B. Destination Gateway 129.255.0.1 129.35.22.8
C. Destination Gateway 224.0.0.1 129.35.22.8
D. Destination Gateway 254.0.0.1 129.35.22.8
书上给出的参考答案是A,但是我从命令中我只能看出端口的IP地址是129.35.22.8子
网掩码是255.0.0.0,看不出适配器的目的网关呀,有谁能解释一下吗?

2. Since the use of /etc/hosts.equiv or ~/.rhosts allows remote access without
using a password, which one of the following procedures is most appropriate to
disable the use of these files?
A. Use the -l flag on rsh and rlogin
B. Put an entry in the /etc/nologin file
C. Delete the /etc/hosts.equiv and ~/.rhosts files and tell your users not to
   create new ones
D. Change permissions of /etc/hosts.equiv and ~/.hosts to anything other than 600
红皮书的答案提示是“C is the most secure, but D will work”,我的看法是D,不知可否?

3. By default, for AIX Version 4.3.3 on which one of the following file systems on
the AIX NFS client will the AIX automount daemon mount file systems from the NFS
server?
A. / (root) file system    B. /tmp file system
C. /mnt file system        D. /var file system
书上参考答案是A,但我找了很多资料都不知道选A的原因，麻烦高手指点一下。


4. Given the following auto master file, which one of the following will the AIX
automount daemon search to find the mount information for a directory?
/home? /- /etc/auto.direct -ro,intr,soft,rsize=8192,wsize=8192 /home
auto.home -rw,intr,hard,rsize=8192,wsize=8192
A. /etc/auto.direct        B. /etc/auto.home
C. /home/auto.home         D. NIS auto.home file
参考答案是D,但我不知道为什么。

5. Below are auto.master and auto.home map files. No home directories are currently
mounted on the AIX NFS client. The automounter is using the default temporary mount
location. Which one of the following actions will occur when user3, whose home is
in /home/user3, logs into the AIX NFS client?
# auto.master
/- /etc/auto.direct -ro,intr,soft,rsize=8192,wsize=8192
/home auto.home -rw,intr,hard,rsize=8192,wsize=8192
# auto.home
user1 nfs_server:/home/user1
user2 nfs_server:/home/user2
user3 nfs_server:/home/user3
user4 nfs_server:/home/user4
A. A No such file or directory error message is displayed.
B. The automount daemon mounts /home/user3 on the nfs_server machine.
C. The automount daemon mounts /home from the nfs_server in /mnt and creates a
   symbolic link from /home/user3 to /mnt/home/user3.
D. The automount daemon mounts /home/user3 from the nfs_server over /tmp_mnt/home/user3
   and creates a symbolic link from /home/user3 to /tmp_mnt/home/user3.
参考答案是D,但我不知道这怎么会产生一个/tmp_mnt/home/user3的目录的，我在资料上没有找到原
因。

6. Given a host with the following /etc/named.boot file:
directory /var/named
secondary nuts.com             128.66.12.1 named.hosts
secondary 132.128.in-addr.arpa 128.66.12.1 named.rev
primary   0.0.127.in-addr.arpa             named.local
cache     .                                named.ca
Which one of the following statements is valid?
A. The address 128.66.12.1 is the primary server for the network 132.128.0.0.
B. The address 128.66.12.1 is the backup secondary server.
C. The address 128.66.12.1 indicates this is a secondary server for network 128.66.0.0.
D. The address 128.66.12.1 is the IP address for this host to use to download data for
   the nuts.com domain.
参考答案是D,但我觉得四个都不对。

7. Which one of the following in /etc/sendmail.cf can be used to change the host name
used for sendmail?
A. Dw macro    B. $j macro    C. Cw macro    D. $=m value
参考答案是A,难道sendmail修改主机名要通过宏吗?

8. A Hayes compatible modem is being attached to a TTY port and will be shared by all users
for both dial-in and dial-out connectivity. What is the best default value for the SMIT TTY
Enable LOGIN field?
A. SHARE   B. ENABLE    C. DELAY    D. HAYES
参考答案选C,题目要求所有的用户共享端口，为什么选A不可以呢?

9. The host's integrated TTY port is DTE. The modem async port is DCE. What is the correct
cable?
A. Straight-thru cable    B. Roll-over cable
C. Null-modem cable       D. RJ-45 cable
参考答案是A,但我不明白为什么?

beginner-bj

第一题是网络基础知识，实际与AIX无关，用排除法，选A

第二题就是“C is the most secure, but D will work”


后面的不想看了