Planning Your Network

Drawing an Internetwork Map

Figure 3-1

Internetwork Map

 

K

 

 

NET2

 

 

 

C 192.002.250 XXX

 

 

 

POINT-TO-POINT

 

A

 

B

 

 

 

NET4

N1

N2

N3

C 192.004.002 XXX

TOKEN RING

G

C

NET1

C 192.001.001 XXX

DTC

Router

LAN

Router

NET6

 

C 192.006.003 XXX

H

FDDI

L

N5

X.25 PSN

DTC

 

I

DTC

NET5

NET3

C 192.005.252 XXX

C 192.003.251 XXX

LAN

X.25

 

J

 

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.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.

 

Single letters are used to represent node names in this example. Actual

NOTE

 

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 and routers, you have established network boundaries. Consider the example and look at Figure 3-1.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.

Chapter 3

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