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Drawing an Internetwork Map
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This section deals with the internetwork as a whole. The internetwork worksheets consist of an internetwork map, which shows an overview of your internetwork, and an internetwork table. You will take the following steps when filling out the internetwork worksheets:

  • Draw sketches of each network in the internetwork.

  • Write network names, IP network addresses, and network types.

  • Draw gateway nodes.

  • Indicate network boundaries.

An internetwork map provides information about the whole internetwork. Figure 3-1 “Internetwork Map” is an example of an internetwork map. This sample internetwork will be used throughout the instructions in this chapter to help explain the other drawings and tables that make up the configuration worksheets.

Before you can draw your internetwork map, you must know how many networks your internetwork will contain, and you must know each network type (LAN, Token Ring, FDDI, 100VG-AnyLAN, 100Base-T, NS Point-to-Point, or X.25). The internetwork in the example (Figure 3-1 “Internetwork Map”) contains six networks. NET1 and NET5 are LANs, NET2 is a Point-to-Point network, NET3 is an X.25 network, NET4 is a Token Ring network, and NET6 is an FDDI network.

NOTE: If you have an X.25 network, you should indicate the presence of each Datacomm and Terminal Controller (DTC) in your internetwork map, as shown in this example (Figure 3-1 “Internetwork Map”). Both the NS 3000/iX node and the DTC must be specially configured for X.25 links.

Figure 3-1 Internetwork Map

[Internetwork Map]

Communication Between Networks

Since the main purpose of the internetwork map is to show how networks are connected, gateway nodes are the only nodes you should label on the internetwork map. All other nodes and their networks can be represented by drawing sketches of the networks, as shown in Figure 3-1 “Internetwork Map”. In the example, node B is a full gateway that belongs to NET1 and NET2, node A is a full gateway that belongs to NET1 and NET4, and node C is a full gateway that belongs to NET1 and NET6. Nodes G and H are gateway halves that belong to NET2 and NET5, respectively.

NOTE: Single letters are used to represent node names in this example. Actual node names must be in an accepted format. They may be either in the form nodename.domain.organization or they may be in a valid domain name format.

Network Boundaries

Once you have drawn your gateway nodes or routers, you have established network boundaries. Consider the example and look at Figure 3-1 “Internetwork Map”. Since node B in the example is a full gateway and belongs to both NET1 and NET2, the boundary between these two networks is at node B itself. The boundary between NET2 and NET5 is along the gateway-half link that connects gateway nodes G and H.

IP Network Addresses

Each network in your internetwork must have a unique IP network address. Add these IP addresses to your internetwork map.

In the example, assume that the Class C IP network addresses are those shown in Figure 3-1 “Internetwork Map”. The specific IP node addresses do not need to be shown until completion of specific parts of the network worksheets, so node portions of IP addresses will be represented with XXX in some maps and tables.



Chapter 3 Planning Your Network
  		 


Completing the Internetwork Table