Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.
The range of a Class B network address is 128 - 191. This makes our binary range 10xxxxxx.
To stop possible address conflicts , a DHCP client will use gratuitous ARP (broadcast an ARP request for its own IP address) to see if another host responds.
A point-to-point link uses only two hosts. A/30, or 255.255.255.252, mask provides two hosts per subnet.
This is a pretty simple question. A/28 is 255.255.255.240, which means that our block size is 16 in the fourth octent. 0,16, 32, 48, 64, 80, etc. The host is in the 64 subnet.
A/27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.
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