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1.1 The value is 27-2 (126) plus 214 - 2 (16,382) plus 221 - 2 (2,097,150) for a total of
2,113,658. We subtract 2 in each calculation since a network ID of all zero bits or all one
bits is invalid.
1.2 Figure D.1 shows a plot of the values through August 1993. Figure D.1 Number of networks announced to NSFNET.
The dashed line estimates that the maximum number of networks will be reached in the
year 2000, if the exponential growth continues.
1.3 "Be liberal in what you accept, and conservative in what you send." Chapter 3
3.1 No, any class A address with a network ID of 127 is OK, although most systems use
3.2 kpno has five interfaces: three point-to-point links and two Ethernets. RIO has four
Ethernet interfaces, gateway has three interfaces: two point-to-point links and one
Ethernet. Finally, netb has one Ethernet interface and two point-to-point links.
3.3 There's no difference: both have a subnet mask of 255.255.255.0, as does a class C
address that is not subnetted. file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/append_d.htm (1 of 20) [12/09/2001 14.48.03] Appendix D: Solutions to Selected Exercises 3.5 It's valid and it's called a noncontiguous subnet mask since the 16 bits for the subnet
mask are not contiguous. The RECs, however, recommend against using noncontiguous
3.6 It's a historical artifact. The value is 1024+512 but the MTU values printed include
any required headers. Solaris 2.2 sets the MTU of the loopback interface to 8232 (8192 +
40), which allows room for 8192 bytes of user data along with the normal 20-byte IP
header and 20-byte TCP header.
3.7 First, datagrams eliminate the need for connection state in the routers. Second,
datagrams provide the basic building block on which unreliable (UDP) and reliable
(TCP) transport layers can be built. Third, datagrams represent the minimal network layer
assumption, allowing a wide range of data-link layers to be used. Ch...
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- Spring '12