Why we use wildacar mask instead of subnet mask in ospf & eigrp roting protocols ..?
CCNA Routing and Switching
As of use both wildcard mask and subnet masks are same but
- when we are calculating subnet mask we make network bits = 1 and host bits =0 . ex. ip = 22.214.171.124 subnet mask = 255.255.255.240 here numbers of 1's = 28 so we can say number of network bits in ip address are 28 and rest 4 bits are hosts bit.
- Wildcard Mask can be calculated as network bits = 0 and host bits = 1 so we can say that wildcard mask is just oppsite to subnet mask.
while some protocols like eigrp , ospf ,bgp use wildcard mask in their network command to enable these protocols on specific interfaces instead on complete router .
ex. ip = 126.96.36.199 its subnet mask = 255.255.255.240 so its wildcard mask will be = 0.0.0.15
how to calculate wildcard mask from subnet mask in above example = first ocet( 255-255 ) . second octet ( 255-255 ) . third octet ( 255-255 ) . fourth octet ( 255- 240 ).
now Routing Protocol uses wildcard mask :
example in eigrp :
network 192.168.1.0 0.0.0.3 will enable eigrp on interfaces having ip addr 192.168.1.1 and 192.168.1.2
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