
893-741-B
C5-5
Network Protocols
The Internet address 129.091.000.063 is a Class B address. It can be specified as 129.91.0.63. The
network address is represented by the decimal numbers 129.91; the host address is 63. The
combination of network address and host address is used to maintain a unique Internet address for
each host.
For a private network, host addresses can be selected arbitrarily, but must be centrally administered
to maintain uniqueness. Network addresses should be officially assigned. Internet addresses can be
obtained from the Network Information Center (NIC).
Subnet Addressing
Another provision of Internet addressing is the subnet. A subnet allows several interconnected local
networks to share a single network number. The local network could include multiple physical
networks (such as Ethernet or point-to-point links) but appears to the external network as a single
entity.
Addressing for a subnet is implemented with the host address section of the Internet address. Within
a subnetted network, each subnet appears as a distinct network. A subnet mask enables a given host
within a subnet to determine whether a packet is to be routed in or out of the subnet. The subnet
mask defines for a host how much of the Internet address is to be used to distinguish hosts on the
network.
Summary of Contents for 5390
Page 28: ...893 741 B Figures xxviii ...
Page 44: ...893 741 B Preface xliv ...
Page 45: ......
Page 48: ......
Page 60: ...A1 12 893 741 B Introduction to the Model 5390 Server ...
Page 106: ...A3 18 893 741 B Configuring Ports ...
Page 142: ...A5 12 893 741 B Printers ...
Page 152: ...A6 10 893 741 B Modems ...
Page 168: ...A7 16 893 741 B Serial Line Internet Protocol SLIP ...
Page 224: ...A9 38 893 741 B Internetwork Packet Exchange IPX Protocol ...
Page 258: ...A11 12 893 741 B Dial up Networking ...
Page 289: ...893 741 B A12 31 Internet Protocol IP Routing that are possible ...
Page 506: ...A15 86 893 741 B Using Model 5390 Security ...
Page 507: ......
Page 544: ...B1 36 893 741 B Network Administration ...
Page 574: ...B2 30 893 741 B Simple Network Management Protocol SNMP ...
Page 575: ......
Page 606: ...C1 30 893 741 B na Commands ...
Page 676: ...C2 70 893 741 B Configuration Parameters ...
Page 772: ...C3 96 893 741 B Using the CLI Commands ...
Page 794: ...C5 12 893 741 B Network Protocols ...
Page 795: ......
Page 796: ... Appendix D1 Software Reference Part D Appendixes ...