[Router1]display current-configuration
# sysname Router1
# FTP server enable
# l2tp domain suffix-separator@
# radius scheme system
# domain system
# local-user admin
password cipher
service-type telnet terminal
level 3
service-type ftp
# interface Aux0
async mode flow
# interface Ethernet0/0
ip address dhcp-alloc
# interface Ethernet0/1
ip address dhcp-alloc
# interface Serial0/0
link-protocol fr
fr interface-type dce
fr map ip 10.0.0.2 255.255.255.0 20 broadcast
fr dlci 30
ip address 10.0.0.1 255.255.255.0
# interface NULL0
# user-interface con 0
user-interface aux 0
user-interface vty 0 4
authentication-mode none
user privilege level 3
# return
[Router2]display current-configuration
# sysname Router2
# FTP server enable
# l2tp domain suffix-separator@
# radius scheme system
# domain system
# local-user admin
password cipher
service-type telnet terminal
level 3
service-type ftp
# interface Aux 0
async mode flow
# interface Ethernet0/0
ip address dhcp-alloc
# interface Ethernet0/1
ip address dhcp-alloc
# interface Serial0/0
clock DTECLK1
link-protocol fr
fr map ip 10.0.0.1 255.255.255.0 20 broadcast
fr dlci 20
ip address 10.0.0.2 255.255.255.0
# interface NULL0
# user-interface con 0
user-interface aux 0
user-interface vty 0 4
authentication-mode none
user privilege level 3
# return
A. 能
B. 不能
C. 信息不足，无法判断X

答案：A
2. 两台路由器背靠背直连，配置如下，路由器之间是否能够通讯（）
[[Router1]display current-configuration
# sysname Router1
# FTP server enable
# l2tp domain suffix-separator@
# radius scheme system
# domain system
# local-user admin
password cipher
service-type telnet terminal
level 3
service-type ftp
# interface Aux0
async mode flow
# interface Ethernet0/0
ip address dhcp-alloc
# interface Ethernet0/1
ip address dhcp-alloc
# interface Serial0/0
link-protocol fr
fr interface-type dce
fr map ip 10.0.0.2 255.255.255.0 20 broadcast
fr dlci 30
ip address 10.0.0.1 255.255.255.0
# interface NULL0
# user-interface con 0
user-interface aux 0
user-interface vty 0 4
authentication-mode none
user privilege level 3
# return
[Router2]display current-configuration
# sysname Router2
# FTP server enable
# l2tp domain suffix-separator@
# radius scheme system
# domain system
# local-user admin
password cipher
service-type telnet terminal
level 3
service-type ftp
# interface Aux 0
async mode flow
# interface Ethernet0/0
ip address dhcp-alloc
# interface Ethernet0/1
ip address dhcp-alloc
# interface Serial0/0
clock DTECLK1
link-protocol fr
fr map ip 10.0.0.1 255.255.255.0 30 broadcast
fr dlci 20
ip address 10.0.0.2 255.255.255.0
# interface NULL0
# user-interface con 0
user-interface aux 0
user-interface vty 0 4
authentication-mode none
user privilege level 3
# return
A. 能
B. 不能
C. 信息不足，无法判断
答案：B

第一题，一个接口上面可以绑定多个dlci号，这个题里面由于dce分配的dlci号是30但两端均使用20，对30没有影响两段可以可同inarp来完成svc的建立完成通信，
第二题由于dce分配了dlci30，虽然dce端没有使用dte也使用fr dlci 20来指定了本段其中一个dlci号为20，但是fr map ip 10.0.0.1 255.255.255.0 30 broadcast这条命令已经定义是使用dlci30但是fr dlci 20只指定了一个dlci号码没有指定30，另外已经使用了fr map ip命令inarp也不能自动发现本端的dlci号所以不通通信本文出自 51CTO.COM技术博客