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Network Emulators
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cnds activities - week 6
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Aims

The aim of this activity is to understand how network addresses are set, on both networking devices and hosts. Network addresses are defined with 0's in the host part, thus for a subnet mask of 255.255.255.0, and a Class B address of 146.176.y.z, then the following will be subnet network addresses: 146.176.10.0, 146.176.11.0, and so on. Routers are typically used to split the network up into subnetworks (subnets). Each port of the router must be assigned an address from the range of addresses from the subnet address pool. Typically this address is either the first or the last in the address pool, such as 146.176.10.1 for the 146.176.10.0 network.

Activity 1: Network addresses

Time to complete: Approx 5 minutes

On the network nodes are address using both their physical address and their network address. When the node is on another interconnected network it is only necessary to use its network address, as the physical address only has local significance. The most popular network addresses are:

IP address: 192.168.0.10
IPX address: 2B10.0000.00CC.0125
NetBIOS: \\freds_pc

The NetBIOS name is used in Microsoft Windows networks, and has significance within a Windows domain. When a node is created in a Windows environment it is given a NetBIOS name (such as freds_pc in the example above).

IPX uses a 12-byte station address (whereas IP uses a 4-byte address), which is made up of:

Network part. This uses the 32 bits of the network address. This is assigned by the network administrator. In the example above this is 2B10.
Node part. This typically uses the 48-bit MAC address of the node, and is automatically assigned. In the example above this is 0000.00CC.0125.

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Activity 2: IP address allocation

Time to complete: Approx 10 minutes

In this activity you should assign the addresses by dragging the red boxes onto the black boxes. In a network a network address contains 0's in the host part of the address, whereas nodes and router ports must have a unique IP address. In the activity there are a number of address which require to be allocated onto each of the subnetworks.

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Activity 3: Setting IP addresses on hosts

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1

Set the IP address to 192.168.0.3

Set the subnet mask to 255.255.255.0

The gateway address relates to port of the router which it connects to, thus set the gateway address to 192.168.0.1

Set the DNS server to 168.10.11.12

 

Activity 3: On-line test

There is no on-line test this week, as there is a formal test.