centos6.0 的网络配置问题

配置文件如下：
# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
NM_CONTROLLED=yes
ONBOOT=yes
HWADDR=00:0c:29:e5:aa:ab
TYPE=Ethernet
BOOTPROTO=none
PREFIX=24
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
# UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
USERCTL=no
DNS1=' 192.168.1.1'
IPADDR=192.168.1.200
NETMASK=255.255.255.0
GATEWAY=192.168.1.1

系统reboot后 
#ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:0C:29:E5:AA:AB  
  BROADCAST MULTICAST MTU:1500 Metric:1
  RX packets:736 errors:0 dropped:0 overruns:0 frame:0
  TX packets:363 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000 
  RX bytes:71100 (69.4 KiB) TX bytes:41624 (40.6 KiB)
  Interrupt:19 Base address:0x2000 
 只有从新启动一下网络服务 才行 
  请问一下是什么原因？ 

 # UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03这里如果 不注释掉会出现：

Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: Error: Unknown connection: 5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03.
  [FAILED]

EVICE=eth0
BOOTPROTO=none
HWADDR=00:0C:29:14:6D:4F
TYPE=Ethernet
DEVICE=eth0
NETMASK=255.255.255.0
IPADDR=192.168.1.148
GATEWAY=192.168.1.1
ONBOOT=yes
USERCTL=no
IPV6INIT=no
PEERDNS=yes