思科认证考试（ＣＣＮＡ）考试模拟题６０—７１及答案

70. [FINx] Given the following configuration for Router A: 

Router_a(config)#interface s0

Router_a(config-if)#encapsulation frame-relay 

Router_a(config-if)#frame-relay lmi-type cisco

Router_a(config-if)#frame-relay 

map ip 172.16.1.2 100 ietf 

Router_a(config-if)#frame-relay 

map ip 172.16.1.3 101 ietf

Router_a(config-if)#frame-relay 

map ip 172.16.1.4 102 ietf

Router_a(config-if)#frame-relay 

map ip 172.16.1.5 103 ietf

Router_a(config-if)#frame-relay 

map ip 172.16.1.6 104 ietf

Router_a(config-if)#ip address 

172.16.1.1 255.255.255.0
　

Which of the following is the proper configuration for Router F? 

a) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation 

frame-relay ietf

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 604
　

b) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation frame-relay

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 104 ietf
　

c) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation 

frame-relay ietf

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 104 
　

d) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation frame-relay

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 604 
　

e) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation 

frame-relay ietf

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 104
　

Answer 
a) 

Router_f(config)#interface s0

Router_f(config-if)#encapsulation 

frame-relay ietf

Router_f(config-if)#frame-relay lmi-type ansi

Router_f(config-if)#ip address 

172.16.1.6 255.255.255.0

Router_f(config-if)#frame-relay 

map ip 172.16.1.1 604
　

There are several configuration parameters that must be checked to answer these frame relay questions. 

LMI 

Does not have to match end to end this is communication between the local router and the local frame relay switch 

Encapsulation 

This parameter needs to match end to end. 

Frame map statement 

The ip address here needs to be the next hop address and the DLCI number needs to be the local DLCI. 

The local DLCI for Router F is 604 
The next hop address is Router A 172.16.1.1 
Encapsulation is IETF 
LMI does not have to match