Information Technology Reference
In-Depth Information
Figure 11-8
DR/BDR Election Exercise 2 Topology (Answer)
Router ID
172.15.1.1/30
S0/0/0
172.18.1.2/30
S0/0/1
RTA
Router ID
Router ID
172.15.1.2/30
S0/0/0
172.18.1.1/30
S0/0/0
RTD
RTB
Fa0/0
172.16.1.2/24
Fa0/0
172.17.1.2/24
Fa0/1
172.16.1.1/24
Fa0/0
172.17.1.1/24
RTC
Router ID
Network
DR/BDR
Which Router
Which Router
Election?
Is the DR?
Is the BDR?
172.15.1.0/30
No
—
—
172.16.1.0/24
Ye s
RT C
RT D
172.17.1.0/24
Ye s
RT B
RT C
172.18.1.0/30
No
—
—
Refer to Figure 11-9 and answer the following questions.
Figure 11-9
DR/BDR Election Exercise 3 Topology (Answer)
Fa0/0 = 192.168.0.1/24
S0/0/0 = 209.165.201.2/30
Router ID
S0/0/0
RTA
ISP
Fa0/0
S0/0/0 = 209.165.201.1/30
OSPF
Area 0
Fa0/0
Fa0/0
S0/0/0
S0/0/0
RTC
RTB
Fa0/0 = 192.168.0.3/24
S0/0/0 = 192.168.1.3/30
Lo0 = 10.1.1.1/32
Fa0/0 = 192.168.0.2/24
S0/0/0 = 192.168.1.2/30
Router ID
Router ID
What is the router ID for RTA?
209.165.201.2
What is the router ID for RTB?
192.168.1.2
What is the router ID for RTC?
10.1.1.1
