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- Question
What are reasons for creating OSPF in a hierarchical design?
- To decrease routing overhead
- To speed up convergence
- To confine network instability to single areas of the network
- To make configuring OSPF easier
Options- A. 1, 2 and 3
- B. 3 only
- C. 3 and 4
- D. 2, 3 nd 4
- Correct Answer
- 1, 2 and 3
ExplanationOSPF is created in a hierarchical design, not a flat design like RIP. This decreases routing overhead, speeds up convergence, and confines network instability to a single area of the network. - 1. Where are EIGRP successor routes stored?
Options- A. In the routing table only
- B. In the neighbor table only
- C. In the topology table only
- D. In the routing table and the topology table
- E. In the routing table and the neighbor table Discuss
- 2. Which type of OSPF network will elect a backup designated router?
- Broadcast multi-access
- Non-broadcast multi-access
- Point-to-point
- Broadcast multipoint
Options- A. 1 and 2
- B. 3 and 4
- C. 3 only
- D. None of the above Discuss
- 3. Which of the following describe the process identifier that is used to run OSPF on a router?
- It is locally significant.
- It is globally significant.
- It is needed to identify a unique instance of an OSPF database.
- It is an optional parameter required only if multiple OSPF processes are running on the router.
Options- A. 1, 2 and 4
- B. 1 and 3
- C. 3 and 5
- D. All of the above Discuss
- 4. Which of the following are true regarding OSPF areas?
- You must have separate loopback interfaces configured in each area.
- The numbers you can assign an area go up to 65,535.
- The backbone area is also called area 0.
- If your design is hierarchical, then you don't need multiple areas.
- All areas must connect to area 0.
Options- A. 1 only
- B. 1 and 2 only
- C. 3 and 4 only
- D. 3, 4 and 5 Discuss
- 5. If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?
Options- A. The lowest IP address of any physical interface
- B. The highest IP address of any physical interface
- C. The lowest IP address of any logical interface
- D. The highest IP address of any logical interface Discuss
- 6. Which is true regarding EIGRP successor routes?
- A successor route is used by EIGRP to forward traffic to a destination.
- Successor routes are saved in the topology table to be used if the primary route fails.
- Successor routes are flagged as "active" in the routing table.
- A successor route may be backed up by a feasible successor route.
- Successor routes are stored in the neighbor table following the discovery process.
Options- A. 1 and 3
- B. 2 and 3
- C. 1 and 4
- D. 3, 4 and 5 Discuss
- 7. With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?
Options- A. Point-to-point
- B. Backbone area 0
- C. Broadcast multi-access
- D. Non-broadcast multi-access Discuss
- 8. You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?
Options- A. show ip eigrp adjacency
- B. show ip eigrp topology
- C. show ip eigrp interfaces
- D. show ip eigrp neighbors Discuss
- 9. You get a call from a network administrator who tells you that he typed the following into his router:
He tells you he still can't see any routes in the routing table. What configuration error did the administrator make?Router(config)#router ospf 1 Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
Options- A. The wildcard mask is incorrect.
- B. The OSPF area is wrong.
- C. The OSPF Process ID is incorrect.
- D. The AS configuration is wrong. Discuss
- 10. Which command will display all the EIGRP feasible successor routes known to a router?
Options- A. show ip routes *
- B. show ip eigrp summary
- C. show ip eigrp topology
- D. show ip eigrp adjacencies Discuss
EIGRP and OSPF problems
Search Results
Correct Answer: In the routing table and the topology table
Explanation:
Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure.
Correct Answer: 1 and 2
Explanation:
DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default. No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology.
Correct Answer: 1 and 3
Explanation:
The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion.
Correct Answer: 3, 4 and 5
Explanation:
Loopback interfaces are created on a router, and the highest IP address on a loopback (logical) interface becomes the RID of the router but has nothing to do with areas and is optional, so (1) is wrong. The numbers you can create an area with are from 0 to 4,294,967,295 option (2) is wrong. The backbone area is called area 0, so option (3) is correct. All areas must connect to area 0, so option (5) is correct. If you have only one area, it must be called area 0. This leaves option (4), which must be correct; it doesn't make much sense, but it is the best answer.
Correct Answer: The highest IP address of any physical interface
Explanation:
At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router. If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.
Correct Answer: 1 and 4
Explanation:
Successor routes are the routes picked from the topology table as the best route to a remote network, so these are the routes that IP uses in the routing table to forward traffic to a remote destination. The topology table contains any route that is not as good as the successor route and is considered a feasible successor, or backup route. Remember that all routes are in the topology table, even successor routes.
Correct Answer: Point-to-point
Explanation:
No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology. DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default.
Correct Answer: show ip eigrp neighbors
Explanation:
The
show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit interval and queue counts for the neighbors that have established an adjacency.
Correct Answer: The wildcard mask is incorrect.
Explanation:
The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255.
Correct Answer: show ip eigrp topology
Explanation:
Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure. You can see the topology table with the
show ip eigrp topology command.
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