OSPF Review (The Second Best IGP)
In information technology, the connection of one computer to another is what matters. Specialists refer to this as networking. The quiz below is on open shortest path first (OSPF) and it will help you better understand what you already know.
- 1.
Which attribute does not apply to OSPF?
- A.
VLSM is supported
- B.
Route Summarization is supported
- C.
Split Horizon is supported
- D.
Link State within and Area is supported
- E.
All of the Above
Correct Answer
C. Split Horizon is supportedExplanation
Split Horizon is not "supported" in OSPF. I wonder WHY? Hmmm good question.Rate this question:
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- 2.
Why Doesn't OSPF use Split Horizon or poison reverse?
- A.
Because poisoning is cruel.
- B.
OSPF uses a form of Split Horizon and Poison Reverse, called akuna matata.
- C.
OSPF was designed to provide a loop free topology and the requirement of Area 0 is one of these methods.
- D.
All of the Above
Correct Answer
C. OSPF was designed to provide a loop free topology and the requirement of Area 0 is one of these methods.Explanation
Poison reverse was a hack!
Split horizon as a concept sort of lives on with many protocols. Don't advertise out interfaces from where you learned the information. That just sounds like good life advice doesn't it?Rate this question:
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- 3.
Within a Non-Area 0 Area, how is a loop free topology ensured?
- A.
Hot sausages
- B.
All routers share the same database of all links in the area and compute the Djisktra algorithm to on that same data set, this ensures a loop free environment. The "Link State Data Base" and mechanisms to ensure the LSDB is synchronized is very important in OSPF: mechanisms to update missing LSAs and to ensure synchronization are built into OSPF messages.
- C.
OSPF relies on EIGRP for its control plane
- D.
All of the Above
Correct Answer
B. All routers share the same database of all links in the area and compute the Djisktra algorithm to on that same data set, this ensures a loop free environment. The "Link State Data Base" and mechanisms to ensure the LSDB is synchronized is very important in OSPF: mechanisms to update missing LSAs and to ensure synchronization are built into OSPF messages.Explanation
All routers in a non-Area 0 area of OSPF share the same database of all links in the area and compute the Dijkstra algorithm on that same dataset. This ensures a loop-free environment by allowing each router to have a complete and consistent view of the network topology. The "Link State Database" (LSDB) is crucial in OSPF, as it stores all the link state advertisements (LSAs) and ensures synchronization among routers. OSPF messages contain mechanisms to update missing LSAs and maintain LSDB synchronization, further enhancing the loop-free topology.Rate this question:
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- 4.
When do you use OSPFv2 versus OSPFv3?
- A.
OSPFv2 is for IPv4 and OSPFv3 is for IPv6.
- B.
OSPFv3 is only available in ISR-G2 bundles with Advanced IP Services.
- C.
What happened to OSPFv1?
- D.
All of the Above
Correct Answer
A. OSPFv2 is for IPv4 and OSPFv3 is for IPv6.Explanation
OSPFv2 is used when working with IPv4 networks, as it is specifically designed for this protocol. On the other hand, OSPFv3 is used for IPv6 networks, providing support for the newer version of the Internet Protocol. The statement "All of the Above" is not a valid explanation as it does not provide any specific information about when to use OSPFv2 versus OSPFv3.Rate this question:
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- 5.
Below are the MCAST Addresses for OSPF: 224.0.0.5 is used when sending to ALL OSPF ROUTERs 224.0.0.6 is used when Routers send updates to the DR and BDR
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
For OSPFv2, 224.0.0.5 is indeed used when sending to all OSPF routers, and 224.0.0.6 is used for routers sending updates to the DR and BDR. However, it's essential to note that this applies specifically to OSPFv2, not OSPFv3, which is designed for IPv6.Rate this question:
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- 6.
OSPF use Protocol 89 for transport and EIGRP uses Protocol 88 for Transport
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that OSPF (Open Shortest Path First) uses Protocol 89 for transport, while EIGRP (Enhanced Interior Gateway Routing Protocol) uses Protocol 88 for transport. This means that OSPF and EIGRP use different protocols for communication and data exchange. Therefore, the statement "OSPF use Protocol 89 for transport and EIGRP uses Protocol 88 for Transport" is true.Rate this question:
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- 7.
ASBR sends Type 3 LSAs into Area 0.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
ASBR (Autonomous System Boundary Router) is responsible for exchanging routing information between different autonomous systems. Type 3 LSAs (Link State Advertisements) are used to advertise inter-area routes. ASBRs send Type 5 LSAs into Area 0, not Type 3 LSAs. Therefore, the given statement is false.Rate this question:
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- 8.
What is the acronym "ABR" short for?
- A.
All Boys Ride
- B.
A Big Router
- C.
Area Boundary Router
- D.
Area Border Router
- E.
All of the Above
Correct Answer
D. Area Border RouterExplanation
the Bigger acronym has the bigger word (in this case):
ASBR = Boundary
ABR = BorderRate this question:
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- 9.
Intra-Area Routes are preferred of Inter-Area routes?
- A.
Not sure
- B.
When is this over?
- C.
True
- D.
False
Correct Answer
C. TrueExplanation
Intra-Area routes are preferred over Inter-Area routes because they have a lower cost and are more efficient. Intra-Area routes are within a single area of a network, allowing for faster communication and less congestion. Inter-Area routes, on the other hand, involve communication between different areas, which can lead to higher costs and slower transmission speeds. Therefore, it is true that Intra-Area routes are preferred over Inter-Area routes.Rate this question:
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- 10.
E1 routes include the cost to the ASBR in the OSPF Cost.
- A.
E1 is an external route that ASBRs redistribute into OSPF.
- B.
Historically, E2 was when the cost to get to the ASBR was insignificant versus the low bandwidth of the External link.
- C.
Yes
- D.
E2 was also a computationally easier way to handle external routes, since the cost was the same from all OSPF routers and no calculations had to be made.
Correct Answer
C. YesExplanation
The given explanation suggests that the answer is "Yes" because historically, E2 routes were used when the cost to reach the ASBR was insignificant compared to the low bandwidth of the external link. Additionally, E2 routes were computationally easier to handle since the cost was the same from all OSPF routers and no calculations were needed.Rate this question:
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- 11.
The Link State DataBase is synchronized in OSPF -- across all routers.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
ALL ROUTERS: this is a trick question. I was asked this on an exam before. The answer is if the OSPF AREA has multiple Areas the LSDB will not be the same on ALL ROUTERS.Rate this question:
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Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 25, 2024Quiz Edited by
ProProfs Editorial Team -
Feb 20, 2013Quiz Created by
Ray Aragon
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