| Exam 200-105 | Question id=1939 | Infrastructure Maintenance |
Dubai#sh frame-relay map
Serial1/0 (up): ip 172.30.0.2 dlci 825 (0x7B,0x1CB0), dynamic, broadcast,, status defined, active
Serial1/0 (up): ip 172.30.0.3 dlci 230 (0xEA,0x38A0), dynamic, broadcast,, status defined, active
Serial1/0 (up): ip 172.30.0.4 dlci 694 (0x159,0x5490), dynamic, broadcast,, status defined, active
Serial1/0 (up): ip 172.30.0.5 dlci 387 (0x1C8,0x7080), dynamic, broadcast,, status defined, active
Dubai#sh run
<output omitted>
!
interface FastEthernet0/0
no ip address
shutdown
!
interface Serial1/0
ip address 172.30.0.1 255.255.255.240
encapsulation frame-relay
no fair-queue
!
interface Serial1/1
ip address 192.168.0.1 255.255.255.252
!
interface Serial1/2
ip address 192.168.0.5 255.255.255.252
encapsulation ppp
!
interface Seriall/3
ip address 192.168.0.9 255.255.255.252
encapsulation ppp
ppp authentication chap
!
router rip
version 2
network 172.30.0.0
network 192.168.0.0
no auto-summary
!
If required, what password should be configured on the SouthIslands router in the branch office to allow a connection to be established with the S-AMER router?
| A. |
No password is required. | |
| B. |
Enable | |
| C. |
Secret | |
| D. |
Telnet | |
| E. |
Console |
In the diagram, SouthIslands is connected to Dubai's S1/2 interface and is configured as follows:
Interface Serial1/2
IP address 192.168.0.5 255.255.255.252
Encapsulalation PPP; Encapsulation for this interface is PPP
Example:
Network Diagram
If Router 1 initiates a call to Router 2, Router 2 would challenge Router 1, but Router 1 would not challenge Router 2. This occurs because the ppp authentication chap calling command is configured on Router 1. This is an example of a unidirectional authentication. In this setup, the ppp chap hostname alias-r1 command is configured on Router 1. Router 1 uses "alias-r1" as its hostname for CHAP authentication instead of "r1." The Router 2 dialer map name should match Router 1's ppp chap hostname; otherwise, two B channels are established, one for each direction.
Router 1
!
isdn switch-type basic-5ess
!
hostname rl
!
username r2 password 0 cisco
! -- Hostname of other router and shared secret
!
interface BRIO/O
ip address 20.1.1.1 255.255.255.0
no ip directed-broadcast encapsulation ppp
dialer map ip 20.1.1.2 name r2 broadcast 5772222
dialer-group 1
isdn switch-type basic-5ess
ppp authentication chap callin
!-- Authentication on incoming calls only
ppp chap hostname alias-rl
! -- Alternate CHAP hostname