Network Worksheets

Figure 3-2 “LAN Network Map” is a drawing of the network map for NET1. The network map is a detailed drawing of the same network shown in the internetwork map (Figure 3-1 “Internetwork Map”). The network name, the IP network address, and the network type are listed at the top of the network map.

In the example, the internetwork map shows that node B is a gateway node. It is noted on the NET1 network map and shows the network that the gateway node can reach. Node B is also a proxy server. The remaining NET1 nodes and their names are added to the network map.

Figure 3-2 LAN Network Map

Refer to the LAN network map to fill in the LAN network table (Table 3-2 “LAN Network Table”). The first column lists the names of all the nodes on NET1. Each node is assigned an IP address that is unique within the network. Only the node portion of the IP address is listed since the IP network address is noted at the top of the table. In the third column of Table 3-2 “LAN Network Table”, node B is shown as a proxy server. The fourth column lists node B as a gateway node. In the Implementation Priority column, the nodes are ranked in the recommended order of configuration.

The purpose of the LAN internet routing table (Table 3-3 “LAN Internet Routing Table”) is to list all possible networks that can be reached from each gateway node on a LAN, such as NET1 in the example.

As shown on the internetwork map, NET1 includes a gateway node, node B. In the IP Node Address column of the LAN internet routing table, the node portion of the gateway node's IP address is listed. The LAN internet routing table shows that NET1 nodes using node B as a gateway can reach NET2 in one hop, NET5 in two hops, and NET3 in three hops. Node B is also designated as a default gateway.

NET2 is the Point-to-Point network in the sample internetwork. Figure 3-3 “Point-to-Point Network Map” is a drawing of the network map for NET2. The network map is a detailed drawing of the same network shown in the internetwork map (Figure 3-1 “Internetwork Map”). The network name, the IP network address, and the network type are listed at the top of the network map. This information is derived from the internetwork map.

The internetwork map shows that nodes B and G are gateway nodes and also shows the networks that the gateway nodes can reach. The remaining NET2 nodes and their names are added to the network map. Node G is a central administrative node.

Figure 3-3 Point-to-Point Network Map

Refer to the Point-to-Point network map to fill in the Point-to-Point network table (Table 3-4 “Point-to-Point Network Table”). We have completed the first column by listing the names of all the nodes on NET2. Each node is assigned an IP address that is unique within the network. Only the node portions of the IP addresses are listed because we have listed the IP network address at the top of the table. In the third column of Table 3-4 “Point-to-Point Network Table”, note that node G is a central administrative node. In the fourth column, nodes B and G are indicated as gateway nodes. For the Implementation Priority column, the nodes are ranked in the recommended order of configuration.

The purpose of the Point-to-Point internet routing table (Table 3-5 “Point-to-Point Internet Routing Table”) is to list all possible networks that can be reached from each gateway node on a Point-to-Point network, which is NET2 in the example. (Note that there may be more than one route to a network.)

As shown on the internetwork map, NET2 includes two gateway nodes, B and G. In the IP Node Address column of the Point-to-Point internet routing table, the node portion of each gateway node's IP address is listed. The Point-to-Point internet routing table indicates that NET2 nodes using node B as a gateway can reach NET1 in one hop, NET4 in two hops, and so on.

For Node G, the same type of information is listed.

Figure 3-4 “X.25 Network Map” is a drawing of the network map for NET3. The network map is a detailed drawing of the same network shown in the internetwork map (Figure 3-1 “Internetwork Map”). The network name, the IP address, and the network type are shown on the network map. This information is derived from the internetwork map.

In the example, node B of NET1 and nodes H and I of NET5 are also part of the X.25 network. The remaining NET3 nodes and their names are added to the network map. The network map also shows node H as a central administrative node.

Figure 3-4 X.25 Network Map

Refer to the X.25 network map to fill in the X.25 network table as shown in Table 3-6 “X.25 Network Table”. We complete the first column by listing the names of all the nodes on NET3. Each node is assigned an IP address that is unique within the network. Only the node portions of the IP addresses are listed since the IP network address is listed at the top of the table. In the third column of the table, node H is indicated as a central administrative node. The X.25 (subnet) address for each node is listed in the fifth column of the network table. The X.25 address is a decimal number (up to 15 digits) identifying a node's location on the X.25 subnet for connections using switched virtual circuits (SVCs). Usually this address is inserted in CALL packets to set up connections using SVCs. If the network you will access is a public packet switching network (PSN), these addresses (where appropriate) are recorded on the network subscription form.

The purpose of the X.25 internet routing table (Table 3-7 “X.25 Internet Routing Table”) is to list the other networks in the internetwork that can be reached from the X.25 network, which is NET3 in the example. (Note that there may be more than one route to a network.)

As shown in the internetwork map (Figure 3-4 “X.25 Network Map”), NET3 includes two gateway nodes, B and H. In the X.25 internet routing table note that NET3 nodes using Node H can reach NET5 in one hop, NET2 in two hops, and so on. In the IP Node Address column, the node portion of the node's IP address is listed.

The sample internetwork contains one gateway half pair, as shown in the internetwork map, which is made up of nodes G and H and their connecting link. Figure 3-5 “Gateway-Half Map” is a drawing of the gateway half pair showing the two nodes and the networks to which they belong. In addition, the map shows the link name, LINKRL1.

Figure 3-5 Gateway-Half Map

Table 3-8 “Gateway Half Network Interface Table” is based on the map discussed in the previous section. Both gateway half nodes, the full IP addresses of the partner nodes, the connected networks, and the name of the link are listed. Usually, the link name will be the same from the perspective of each gateway half. The address of the partner gateway half is shown to demonstrate that the partner's address is entered during configuration of a gateway half network interface.