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    CCIE R&S 350-001 Q&As – Implement IPv4 Open Shortest Path First (OSPF) (16-20)

    By admin | June 18, 2014

    Tagged with:

    Section 5 – Implement IPv4 Open Shortest Path First (OSPF)

    QUESTION 16
    Which statement best describes OSPF external LSAs (type 5)?
    A.    OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.
    B.    External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.
    C.    Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.
    D.    External network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area.
    Answer: D

    QUESTION 17
    Study the exhibit carefully. Assume that all the links in this nerwork are internal OSPF links. What will happen when the link between R1 and R3 fails in regards to R4′s path to 10.1.5.0/24.?

    clip_image001
    A.    R1 and R3 will each originate a new router (type 1) LSA, indicating they are no longer connected.  When R4 receives these two LSA’s, it will run SPF and find the alternate path through R2.
    B.    R4′s OSPF database and routing table will not be afffected, since R4 will not have a route to 10.1.5.0/24.  It wil only have default routes originated by the ABRs, R2 and R3.
    C.    R3 will generate a new summary (type3) LSA and flood it into Area 1.  R4, on receiving this LSA, will run SPF and find an alternate path to 10.1.5.0/24 via R2.
    D.    R3 will generate a new summary (type3) LSA and flood it into Area 1.  R4′s route to 10.1.5.0/24 via R2 will not be affected by this new information, since it will be using the path through R2 whether or not the link between R1 and R3 is up.
    Answer: B
    Explanation:
    ABR summary LSA type3 into stub
    Depending on the point where a network is sourced, there are various types of routes that could be present in a OSPF domain.
    When there are multiple routes to a particular network in a OSPF domain, the type of the route influences the route that is selected and installed by the router in the routing table.
    In OSPF, routes that are learned by a router from OSPF sources within the same area are known as inta-area routes.
    Routes that originate from an OSPF router in a different area are considered as inter-area routes.
    Certain networks could belong to a domain outside OSPF, which could then be redistributed into the OSPF by an Autonomous System Boundary Router (ASBR).
    Such routes are considered external routes.
    They can be further divided into external type-1 or external type-2 routes, depending on how they are advertised while being redistributing on the ASBR.
    The difference between these two types is the way in which the metric for the route is calculated.
    OSPF-running routers use these criteria to select the best route to be installed in the routing table:
    1. Intra-area routes.
    2. Inter-area routes.
    3. External Type-1 routes.
    4. External Type-2 routes.
    B) If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route.
    The route with the lowest value for cost is chosen as the best route.
    C) If there are multiple routes to a network with the same route type and cost, it chooses all the routes to be installed in the routing table, and the router does equal cost load balancing across multiple paths.

    QUESTION 18
    You work as a network engineer for the Lead2Pass Company. Study the exhibit carefully. In this network, R1 is redistributing 10.1.5.0/24 into OSPF, and R2 is originating 10.1.4.0/24 as an internal route. PG-R6 has received packets destined to 10.1.4.1 and 10.1.5.1. Which statement is true about the path or paths these two packets will take?
    A.    The packet destined to 10.1.5.1 will follow the optimum path through the network, R4 to R1, while the packet destined to 10.1.4.1 will follow a suboptimal path through the network.
    B.    There is not enough information provided to determine which packet will take an optimal or suboptimal path through the network.
    C.    Both packets will follow optimal paths through the network to their destinations
    D.    The packet destined to 10.1.4.1 will follow an optimal path through the network, while the packet destined to 10.1.5.1 will follow a suboptimal path through the network
    Answer: A
    Explanation:
    Costs dictate path to ABR selected
    Depending on the point where a network is sourced, there are various types of routes that could be present in a OSPF domain.
    When there are multiple routes to a particular network in a OSPF domain, the type of the route influences the route that is selected and installed by the router in the routing table.
    In OSPF, routes that are learned by a router from OSPF sources within the same area are known as inta-area routes.
    Routes that originate from an OSPF router in a different area are considered as inter-area routes.
    Certain networks could belong to a domain outside OSPF, which could then be redistributed into the OSPF by an Autonomous System Boundary Router (ASBR).
    Such routes are considered external routes.
    They can be further divided into external type-1 or external type-2 routes, depending on how they are advertised while being redistributing on the ASBR.
    The difference between these two types is the way in which the metric for the route is calculated.
    OSPF-running routers use these criteria to select the best route to be installed in the routing table:
    1. Intra-area routes.
    2. Inter-area routes.
    3. External Type-1 routes.
    4. External Type-2 routes.
    B) If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route.
    The route with the lowest value for cost is chosen as the best route.
    C) If there are multiple routes to a network with the same route type and cost, it chooses all the routes to be installed in the routing table, and the router does equal cost load balancing across multiple paths.

    QUESTION 19
    On the basis of the network provided in the exhibit, R3 and R4 are configured to run all connected links in OSPF Area 1. The network administrator is complaining that traffic destined to 192.168.1.0/24 is being routed to R2, even if R2 is not running OSPF. Which would be the cause of this problem?

    clip_image002
    A.    The next hop towards 192.168.1.0/24 at R4 should be 10.1.1.2, which is R2.
    B.    The next hop towards 192.168.1.0/24 at R4 should be 10.1.1.1, since R1 is redistributing the route from EIGRP into OSPF. R3 is forwarding traffic incorrectly.
    C.    The next hop towards 192.168.1.0/24 at R4 should be 10.1.2.2, which is R3. R3 should be load-sharing between R1 and R2 for its next hop.
    D.    R4 does not have a route towards 192.168.1.0/24, so the network administrator is wrong in thinking any traffic is being forwarded there.
    Answer: A

    QUESTION 20
    Observe the following exhibit seriously, which path will be preferred by traffic destined to 10.1.3.1 and arriving at R1?

    clip_image003
    A.    through R3, because R1 will only have a summary (type 3) LSA from R2
    B.    through R2, since it is the path through Area 0
    C.    through R3, since that is the lowest cost path (10+10 = 20, which is lower than 100)
    D.    through R2; this is the only path available for R1 to reach 10.1.3.0/24, since R3 is in a different autonomous system than R1 and R2
    Answer: B
    Explanation:
    Intra-Area route first
    Depending on the point where a network is sourced, there are various types of routes that could be present in a OSPF domain.
    When there are multiple routes to a particular network in a OSPF domain, the type of the route influences the route that is selected and installed by the router in the routing table.
    In OSPF, routes that are learned by a router from OSPF sources within the same area are known as inta-area routes.
    Routes that originate from an OSPF router in a different area are considered as inter-area routes.
    Certain networks could belong to a domain outside OSPF, which could then be redistributed into the OSPF by an Autonomous System Boundary Router (ASBR).
    Such routes are considered external routes.
    They can be further divided into external type-1 or external type-2 routes, depending on how they are advertised while being redistributing on the ASBR.
    The difference between these two types is the way in which the metric for the route is calculated.
    OSPF-running routers use these criteria to select the best route to be installed in the routing table:
    1. Intra-area routes.
    2. Inter-area routes.
    3. External Type-1 routes.
    4. External Type-2 routes.
    B) If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route.
    The route with the lowest value for cost is chosen as the best route.
    C) If there are multiple routes to a network with the same route type and cost, it chooses all the routes to be installed in the routing table, and the router does equal cost load balancing across multiple paths.

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