第一题：
路由器a的配置如下
quidway#show run
now create configuration...
current configuration
!
!
interface ethernet0
ip address
!
interface serial0
encapsulation ppp
backup interface serial 1
ip address
!
interface serial1
encapsulation ppp
ip address
!
interface serial2
flowcontrol normal
async mode dedicated
encapsulation ppp
!
exit
router rip
!
end
路由器b的配置如下
quidway#show run
now create configuration...
current configuration
!
!
interface ethernet0
ip address
!
interface serial0
encapsulation ppp
backup interface serial 1
ip address
!
interface serial1
encapsulation ppp
ip address
!
interface serial2
flowcontrol normal
async mode dedicated
encapsulation ppp
!
exit
router rip
!
end
下述说法正确的'是( bcd )
a、备份功能可以正常使用
b、备份功能不能正常使用
c、两端可以正常互联
d、两端不能正常互联
第二题：
quidway#show run
now create configuration...
current configuration
!
!
interface ethernet0
ip address
ip ospf enable area
!
interface serial0
clock-select dteclk1
encapsulation ppp
ip address
ip ospf enable area
!
interface serial1
encapsulation ppp
!
interface serial2
flowcontrol normal
async mode dedicated
encapsulation ppp
!
exit
router ospf enable
!
end
路由器b配置如下
quidway#show run
now create configuration...
current configuration
!
!
interface ethernet0
ip address
ip ospf enable area
!
interface serial0
encapsulation ppp
ip address
ip ospf enable area
!
interface serial1
encapsulation ppp
!
interface serial2
flowcontrol normal
async mode dedicated
encapsulation ppp
!
exit
router ospf enable
!
end
如下说法正确的是( a )
a、两端广域网可以联通，但局域网不可以连通
b、两端广域网不可以连通，但局域网可以连通
c、广域网和局域网都可以连通
d、广域网和局域网都不能连通
