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CCNA 200 - 301 OSPF EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -47 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: How to activate OSPF on your interface and advertise your networks?
Answer:
network
Question 2: Conf t
Int g0/0/0 Ip ospf cost 100
Answer:
How to configure a single interface as passive?Question 3: An OSPF router with Interfaces connected to the backbone area (area 0) and to at least one other area.
Answer:
What does LSA stands for?
Question 4: How to change the cost of a link in OSPF?
Answer:
Router (config-router)#auto-cost reference-bandwidth 1000 Question 5: ?Timers must be the same on both routers. OSPF uses Hello timers that define how often they send out Hello messages and Dead timers that define how long after a router stops hearing a Hello message does it declare its neighbor as down.?Interfaces connecting the two routers must be in the same area.?Password authentication, if being used, must be the same.?Type of area must be the same.
Answer:
What's the default Administrative Distance of BGP (external routes [eBGP])?
Question 6: How to configure OSPF on router R1 and R2 for this setup?
Answer:
How to configure the OSPF in a router so it matches the exact address for example for adress 192.168.50.1 and 192.168.1.1 Question 7: All OSPF routers on the same link that reach the 2-way state that is, they send Hello messages and the parameters match are called neighbors. The subset of neighbors for which the neighbor relationship continues on and reaches the full state are called adjacent neighbors.
Answer:
What's an ABR?
Question 8: Routerl (config)#router ospf 100
Routerl (config-router)#network 192.168.1.1 0.0.0.0 area 0 Routerl (config-router) #network 192.168.50.1 0.0.0.0 area 0
Answer:
Suppose a router has the following IP addresses on its various interfaces:
172.16.0.13
172.16.0.17
172.16.0.21
172.16.0.25
172.16.0.29
How to configure OSFP to accept all interfaces putting them all in area 0 except the one with the address 172.16.0.13 using only one network statement?
Question 9: What this command will do?
auto-cost reference-bandwidth 1000
Answer:
Means that the reference bandwidth is now 10,000 Mbps or 10 Gbps. In that case, by default, a 10-Gbps link would have an OSPF cost of 1, while a 1-Gbps link would have a cost of 10, and a 100-MBps link a cost of 100.
Question 10: 170
Answer:
What's efault Administrative Distance of IGRP
Question 11: 1
Answer:
What does the show ip route command lists?
Question 12: How to calculate the cost for faster links?
Answer:
The bandwidth costs are based on a bandwidth reference of 100Mb. If you have faster links in your enterprise, such as Gigabit Ethernet, you can change what OSPF bases its cost on by using the auto-cost reference-bandwidth command. For example, to change your OSPF to use 10^8 / Bandwidth (1,000,000 or Gb)
Question 13: What are the benefits of route summarization?
Answer:
?Less processing on routers: Fewer networks to advertise and store in the database, less calculations for route changes.?Instability hidden from other routers: If a single network goes down in area 2, it will not affect the routers in area 0 and area
- ?Fast convergence: Because fewer routes are sent to area 0, the routers in areas 0 and 1 can
converge faster.?Less bandwidth overhead: There is less bandwidth because only one route is sent, so the advertisement is smaller.?Greater control over routing updates: Because you gain control over routing updates, you can control what routes get sent from one area to another.
Question 14: Link State Advertisement
Answer:
Which commands can you use to display and troubleshoot ospf?
Question 15: Conf t
Router ospf 100 passive-interface g0/0/0
Answer:
How to configure a router with all interfaces as passive?
Question 16: Whats a router ID?
Answer:
Every router has an identifier called a router ID (RID) that's used to identify itself in its messages. The
router ID is an IP address and is assigned as follows:
?The router ID can be configured with the router-id command under the OSPF routing process. You can choose a valid IP address that you are using on the router or make up a new one.?If the router-id command is not used, the numerically highest IP address on any loopback interface is chosen as the router ID.?If you do not have any loopback interfaces configured, the highest IP address on any active physical interface is chosen as the router ID.
Question 17: How are the LSA exchanged once the DR and BDR are assigned?
Answer:
The Mocha router is the DR, and the Latte router is the BDR. Instead of all 5 routers sending LSAS to each other, they send out messages only to the DR and BDR. Messages are sent to the multicast address of 224.0.0.6; both the DR and BDR belong to this multicast group address.
Question 18: Who developed OSPF? When?
Answer:
The Open Shortest Path First (OSPF) protocol was developed by the Internet Engineering Task Force (IETF) in 1988 as a more scalable solution than RIP.
Question 19: When is a designated router is elected?
Answer:
FThe designated router (DR) is elected on only two types of networks:
?Broadcast multiaccess: Ethernet, Token Ring ?Nonbroadcast multiaccess: Frame Relay, ATM, X.25
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