TSHOOT 642-832 Trouble Ticket 13 – DHCP Range

By | February 28, 2012

Following ticket consists of a problem description and existing configuration on the device.

Trouble Ticket Statement:

Click See Topology

Client 1 and Client 2 are getting a 169.x.x.x IP address and are not able to ping DSW1 or the FTP Server. They are able to ping each other.

Configuration on R4

!
no ip domain lookup
ip dhcp excluded-address 10.2.1.1 10.2.1.253
ip dhcp excluded-address 10.2.1.254
!
ip dhcp pool TSHOOT
network 10.2.1.0 255.255.255.0
default-router 10.2.1.254
!

Question 1:
On Which device is the fault condition located?
A. R1
B. R2
C. R3
D. R4
E. DSW1
F. DSW2
G. ASW1
H. ASW2
Correct Answer: D
Explanation:
Since Client1 is getting ip address 169.x.x.x, there may be problem in DHCP. On closer look into the DHCP configuration on DHCP Server i.e R4 you get ip dhcp excluded-address command has wrongly configured.
So the fault condition is located on R4.

Question 2:
The fault condition is related to which technology?
A. NTP
B. IP DHCP Server
C. IPv4 OSPF Routing
D. IPv4 EIGRP Routing
E. IPv4 Route Redistribution
F. IPv6 RIP Routing
G. IPv6 OSPF Routing
H. IPV4 and IPV6 Interoperability
I. IPV4 layer 3 security
Correct Answer: B
Explanation:
Since Client1 is getting ip address 169.x.x.x, there may be problem in DHCP. On closer look into the DHCP configuration on DHCP Server i.e R4 you get ip dhcp excluded-address command has wrongly configured.
So the fault condition is related to IP DHCP Server.

Question 3:
What is the solution to the fault condition?
A. Under global configuration, delete the no ip dhcp use vrf connected command.
B. Under IP DHCP pool configuration, delete the default-router 10.2.1.254 command and enter the defaultrouter 10.1.4.5 command.
C. Under IP DHCP pool configuration, delete the network 10.2.1.0 255.255.255.0 command and enter the network 10.1.4.0 255.255.255.0 command.
D. Under the IP DHCP pool configuration, issue the no ip dhcp excluded-address 10.2.1.1 10.2.1.253 command and enter the ip dhcp excluded-address 10.2.1.1 10.2.1.2 command.
Correct Answer: D
Explanation:
Since Client1 is getting ip address 169.x.x.x, there may be problem in DHCP. On closer look into the DHCP configuration on DHCP Server i.e R4 you get ip dhcp excluded-address command has wrongly configured.
Under IP DHCP pool configuration issue the command "no ip dhcp excluded-address 10.2.1.1 10.2.1.253" and enter the command " ip dhcp excluded-address 10.2.1.1 10.2.1.2". Soon the client 1 will get the Ip address from DHCP.