Csc570 Computer Networks: Renewing The Assessment Answers
Questions:
Watch the following Youtube video for the preparation of GNS Lab
https://www.youtube.com/watch?v=4ep40vSgwiQ
https://www.youtube.com/watch?v=wSOmZgXzs1E
- Define a network topology with 8 routers, R1 through R8. Configure the routers to learn the shortest route using OSPF. Show the routing table on R1, R4, and R8 respectively and verify the correct routing.
- Disable a router and show that the routing table can be renewed using OSPF. Demonstrate the renewed routing.
Answers:
1.
Network Topology with 8 Routers configured to implement the OSPF algorithm
Routing Tables for Router 1, Router 2, up to Router 8.
Router 1 (Routing Table).
IP address Router 1: 192.168.1.1
Subnet: 255.255.255.0
Serial 0/0/0 port status ON, IP 10.0.0.1, Subnet 255.0.0.0
Workstation: IP 192.168.1.1
Workstation’s subnet Mask: 255.255.255.0
Default gateway: 192.168.2.1 (Rodriguez, 2016)
Router 2 (Routing Table).
IP address Router: 192.168.2.1
Subnet for router: 255.255.255.0
Workstation: IP 192.168.2.2, Subnet Mask: 255.255.255.0, Default gateway: 192.168.2.1
Serial 0/0/0 port status ON, IP 11.0.0.1 255.0.0.0
Serial 0/0/1 port status ON, IP 11.0.0.2 255.0.0.0
Router 3 (Routing Table).
IP address Router: 192.168.3.1
Subnet for router: 255.255.255.0
Workstation IP 192.168.3.2
Workstation’s Subnet Mask: 255.255.255.0
Default gateway: 192.168.3.1
Serial 0/0/0 port status ON, IP 12.0.0.1, Subnet Mask 255.0.0.0
Serial 0/0/1 port status ON: IP 12.0.0.2, Subnet: 255.0.0.0
Router 4 (Routing Table).
Router IP: 192.168.4.1
Router subnet: 255.255.255.0
Serial 0/0/0 port status ON, IP 13.0.0.1 subnet 255.0.0.0
Serial 0/0/1 port status ON, IP 13.0.0.2 subnet 255.0.0.0
Workstation: IP 192.168.4.2
Subnet Mask for workstations: 255.255.255.0
Default gateway: 192.168.4.1
Router 5 (Routing Table).
Router IP: 192.168.5.1
Subnet for router: 255.255.255.0
Serial 0/0/0 port status ON IP 14.0.0.1, Subnet: 255.0.0.0
Serial 0/0/1 port status ON IP 14.0.0.2, Subnet: 255.0.0.0
Workstation: IP 192.168.5.2 Subnet Mask: 255.255.255.0
Default gateway: 192.168.5.1
Router 6 (Routing Table).
Router IP: 192.168.6.1
Subnet for router: 255.255.255.0
Serial 0/0/0 port status ON IP 15.0.0.1 255.0.0.0
Serial 0/0/1 port status ON IP 15.0.0.2 255.0.0.0
Workstation: IP 192.168.6.2
Subnet Mask for workstations: 255.255.255.0
Default gateway: 192.168.6.1
Router 7 (Routing Table).
Router IP: 192.168.7.1
Router subnet: 255.255.255.0
Serial 0/0/0 port status ON IP 16.0.0.1 Subnet 255.0.0.0
Serial 0/0/1 port status ON IP 16.0.0.2 Subnet 255.0.0.0
Workstation: IP 192.168.7.2
Subnet Mask for workstation: 255.255.255.0
Default gateway: 192.168.7.1
Router 8 (Routing Table).
Router Ip: 192.168.8.1
Subnet for router: 255.255.255.0
Serial 0/0/0 port status ON IP 17.0.0.1 Subnet mask: 255.0.0.0
Workstation: IP 192.168.8.2
Subnet Mask for workstations: 255.255.255.0
Default gateway: 192.168.8.1
2. Renewing the Routing Table Using OSPF
The Open Shortest Path First (OSPF) is a technique used to find the shortest path from one router to another in any network (Medhi, 2107). When there is a larger LAN, OSPF will create a typography of all the router connections. In the event that data is sent from different locations, the OSPF algorithm will evaluate all the available routes and decides on the most suitable and efficient route to send data. This, therefore, will get rid of unnecessary delays during transmission of data. When a router is disabled in a network that utilizes the Open Shortest Path First algorithm, it is simple to later renew the routing table since the OSPF algorithm always keeps a routing table or a typography as aforementioned. It will thus have the previous configurations of all disabled routers and will be simpler to restore those past router configurations.
If router 6 is disabled, a copy of all of its IP configurations will be kept by the OSPF algorithm. The normal transfer of data among the remaining seven routers will not be interfered with. When router 6 is enabled, it will be set with its earlier configurations only if a different router has not been deployed with the same IP configurations as the disabled router (Ligayizi et al., 2015).
Disabling Router 6
Switching router 6 off / Disabling
Enabling Router 6 again.
Initial routing table is renewed by OSFP
References:
Medhi, D., & Ramasamy, K. (2017). Network routing: algorithms, protocols, and architectures. Morgan Kaufmann.
Lugayizi, F. L., Gasela, N., & Michael, E. B. (2015). Performance Evaluation of OSPF and EIGRP Routing Protocols for Video Streaming over Next Generation Networks. Advances in Computer Science: an International Journal, 4(5), 29-35.
Rodriguez, F. J., Fernandez, S., Sanz, I., Moranchel, M., & Bueno, E. J. (2016). Distributed Approach for SmartGrids Reconfiguration based on the OSPF routing protocol. IEEE Transactions on Industrial Informatics, 12(2), 864-871.
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