lab

1. Seneca DCN330 – Fall 2017
Report for Lab 8
Name: Student ID: Date:
NOTE: Record your results in this report. Submit your Packet Tracer source file separately with
your submission (i.e., upload your PKA file to the BlackBoard separately with this lab report). Do
not upload compressed files such as ZIP, TAR, or RAR. Failed to do so may result in significant
mark deductions.
Task
1
(30%
mark)
Before working on the Packet Tracer activity, answer the following questions. (If a
question contains two sub questions, each question weights 50% mark for that question.)
1. (2 sub questions) There are three possible Cisco routes for a router to reach a destination
network. The first route is from OSPF with a metric of 782. The second route is from RIPv2
with a metric of 4. The third is from EIGRP with a composite metric of 20514560. Which route
(RIPv2, EIGRP, OSPF, or all of them) will be installed by the router in its routing table? Why?
2. (2 sub questions) In the accompanying diagram, which of the routers must be ABRs (Area
Border Routers)? (Choose all routers that apply.) Why? (Give your reasons briefly as well.)

2. Seneca DCN330 – Fall 2017
3. (2 sub questions) You get a call from a network administrator who tells you that he typed the
following into his router:
Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
He tells you he still can’t see any routes in the routing table. What configuration error did the
administrator make? What’s the meaning of OSPF area 0 here?
4. OSPF Hello messages are sent to the IP address 224.0.0.5. What does that address mean?
5. (2 sub questions) In OSPF, routers use RIDs to advertise routes, it’s also used to elect the
designated router (DR) and the backup designated router (BDR). By default, how an OSPF
router knows its RID on all physical interfaces? Will this RID process change if we configured
logical interfaces (loopback interfaces)?
Task
2
(50%)
Follow the lab instructions posted on Blackboard, and finish the Packet Tracer Activity
by yourself.
Once you finished the configuration on three OSPF routers, the OSPF protocol should be up
and running between the routers. We can see how different types of OSPF packets (including
Hello packets) are exchanged in the network by enabling the Simulation mode with Packet
Tracer (normally we are in the Real-time mode). You can switch between the two modes by
clicking the icon in the lower right corner on the Packet Tracer window, or check the Help
document on the Packet Tracer menu. Once you are in the Simulation mode, you can see the
packets shown in colour-coded envelops and you can click these envelops to check the packet

3. Seneca DCN330 – Fall 2017
details.
Observe the OSPF message exchange between routers. Then, insert one screenshot below
demonstrating your OSPF packet list in the Simulation Mode of Packet Tracer.
[Your screenshot here]
Task
3
(20%)
Reflection on hands-on lab activities in Task 2
3.1 When we execute
Lab_C(config)#router ospf 102
Why we don’t keep the same Process ID 102 on Lab_A and Lab_B routers?
3.2 (2 sub questions) If we want to disable OSPF on the interface Fa0/0 of the Router
Lab_C, which command should we use? Which command we can use if we want to
disable OSPF on all interfaces of Router Lab_C?
3.3. If we execute the following IOS command, what will happen? (Note: please do a bit
of research on the command access-list in order to answer this question.)
Lab_A(config)#access-list 30 permit 172.16.10.1 0.0.0.255