BROCADE IP PRIMER

Answers to Review Questionscan't use the first 16 bits (that's the default subnet mask). If we need sixbits, we'll add them to the default mask for a total of 22 bits (16 + 6 =22). A 22-bit subnet mask looks like 1111 1111 . 1111 1111 . 11111100 . 0000 0000 (or 255.255.252.0). As you can see from the mask,this leaves 10 bits for the hosts. Conveniently, 210 = 1,024, and 1,024 - 2= 1,022. Just what we needed (or close enough).8. c. ARP matches an IP address with its MAC address. NAT and PAT translateIP addresses. ICMP sends messages between IP devices.9. d. The address looks like this in binary (with the first 27 bits - the networkportion - in bold): 1100 0000 . 1010 1000 . 0110 0100 . 0110 0100. Thenetwork portion translates to 192.168.100.96 (in decimal).10. b. It is a Class B address because the first octet is between 128 and 191(138.232.49.3). If you really want to get tricky, you can translate the firstoctet (138) to binary, and see for yourself. In binary, 138 is 1000 1010.Notice that the first two bits are “10.” If the first bit is “0,” it's a Class A. Ifthe first two bits are “10,” it's a Class B. If the first three bits are “110,”it's a Class C. And so on.Brocade IP Primer 73