How many hosts in each network? /24 = 255 hosts
How many networks do we have to summarize them? 3 (192.168.36.0 - 192.168.37.0 - 192.168.38.0).
Let's multiply: 255 x 3 = 765
What is the closest prefix that contains 765 host? /23 255.255.255.252
The answer is 192.168.36.0 255.255.252.0
A is correct.
This is really a subnetting question. Nothing really to do with OSPF if you think about what the question is asking you.
It wants you to summarize 3 /24s
B only covers one /24.. what about the other two networks? WRONG
C is getting somewhere with a /22 but the wrong network ID is listed. 38.0 in a /22 is a client IP, not a network IP
D is like B, it only covers the first /24 and not the entire /22 we need to include all 3 /24s
A is the only answer that works. in a /22, 192.168.36.0 is a network IP that covers up to 192.168.39.255
this is ABR (area 0 & 22) :
cisco_R3(config-router)#area 22 range 55.0.0.0 255.255.192.0
cisco_R3(config-router)#
cisco_R3(config-router)#do s runn | s router ospf
router ospf 1
router-id 3.3.3.3
auto-cost reference-bandwidth 1000
area 22 range 55.0.0.0 255.255.192.0
area 22 filter-list prefix PL_3 in
passive-interface default
no passive-interface Ethernet0/0.10
no passive-interface Ethernet0/0.50
network 0.0.0.0 255.255.255.255 area 0
bfd all-interfaces
cisco_R3(config-router)#
+ you'll see this summary route on the ABR, it will reject all traffic that does not match more specific route in this range (everything in range 55.0.0.0/18 -> Null0 except 55.0.0.0/24 )
cisco_R3#show ip route ospf | b Ga
Gateway of last resort is 2.2.2.2 to network 0.0.0.0
55.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O 55.0.0.0/18 is a summary, 00:07:13, Null0 <<<<<<<<<<<<<<<<<<< reject
O 55.0.0.0/24 [110/101] via 10.111.10.2, 00:07:13, Ethernet0/0.50 <<<<<<<<< except this
cisco_R3#
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