network topology consists of routers, network switches, firewalls,
workstations, servers and an IPv32 cloud that are connected together. There are
two routers, one network switch, one firewall, and 10 workstations connected
together in each subnet. The routers and the firewalls in each subnet are
connected together using PPP DS1 duplex link. The workstations are connected to
the switch using 100BaseT duplex link. The connection between the subnets is
done using PPP DS1 duplex link. In order to provide email and http support, all
the subnets are connected to an IPv32 cloud device which provides internet
connection to each subnet. The connection between each subnet and the IPv32
cloud device was also done using PPP DS1 duplex link. The detailed description
of the network devices and channels used in the topology are as follows:
? Router model: CS_7000_6s_a_e6_fe2_fr4_sl4_tr4. This router has
several ports for connecting different media types. These include 4 Ethernet
hubs at a data rate of 10Mbps, 4 token rings at a data rate of 4Mbps or 16Mbps,
4 frame relay serial links and 4 serial links at different data transmission
rates, 2 Fast Ethernet ports at a data rate of 10Mbps, and 1 ATM slot. It also
allows a total amount of 150,000 packets that can be transmitted per second. By
default, it uses RIP or OSPF to forward packets.
Network switch model:
eth16_ethech16_fddi16_tr16_switch. This switch has different ports for
connecting different cable types. These include 16 Ethernet ports, 16
Etherchannel ports, 16 FDDI ports and 16 Token Ring ports.
ethernet_wkstn. This device is used to model any workstation that supports a
client–server application running over TCP/IP or UDP/IP. It has the following
ports for connecting different cable types: 1 Ethernet port at a data rate of
10 Mbps, 1 Ether port at a data rate of 100 Mbps or 1 Ethernet port at a data
rate of 1000 Mbps. It also supports the attributes of some client applications
such as email,
database, ftp, http, remote login, etc. This allows specific
application traffic to be generated in it.
ethernet_server. This node is used to represent any server that supports a
server application running over TCP/IP or UDP/IP. It supports 1 Ethernet
connection at a data transmission rate of 10 Mbps, 100 Mbps or 1 Gbps. The link
connected to this node determines the speed at which it operates.
ethernet2_slip8_firewall. This node is used to represent any IP based gateway
that can function as a firewall. It has 2 Ethernet and 8 Serial line ports with
different data transmission rates. When an IP packet arrives on any interface
in this node, it is forwarded to the appropriate outgoing interface based on
the packet’s destination IP address. Packets are routed in this node using RIP
or OSPF by default.
IPv32 Cloud: This node is
used to provide internet connection. It supports 32 Serial line interfaces that
can be selected at different data transmission rates. When an IP packet arrives
on any interface in this node, the packet is forwarded to the appropriate
outgoing interface based on the packet’s destination IP address. Packets are
routed using RIP or OSPF by default.