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    CCIE R&S 350-001 Q&As – Implement IPv4 Open Shortest Path First (OSPF) (11-15)

    By admin | June 18, 2014

    Tagged with:

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

    QUESTION 11
    This question is about the formation of OSPF adjacency. An OSPF adjacency will not form correctly across a point-to-point link in the same area. Which would most likely cause this problem?
    A.    Each interface has a different OSPF cost.
    B.    Each interface is configured with secondary addresses as well as primary addresses.
    C.    Each interface has a different MTU size.
    D.    Each interface is configured with the ip unnumbered loopback 0 command.
    Answer: C
    Explanation:
    unequal MTU means stuck in EX-START

    QUESTION 12
    Study the exhibit carefully. Two directly connected routers are configured with OSPF. The output presented in the exhibit can be seen on the console of one router. What most likely cause this problem?

    clip_image001
    A.    The maximum transmission unit on either side of the link is not the same
    B.    This debug is wrong, OSPF does not exchange DBD packets
    C.    This is normal for OSPF running over an FDDI ring
    D.    OSPF has received a packet that will not fit in its local buffer, so the packet has been discarded.
    Answer: A

    QUESTION 13
    On the basis of the network provided in the exhibit, R1 is injecting 10.1.5.0/24 by use of a network statement as a network (type 2) LSA. What LSAs will R6 have in its local database for 10.1.5.0/24?

    clip_image002
    A.    R6 will not have any LSAs containing 10.1.5.0/24
    B.    R6 will have a summary (type 3) LSA containing 10.1.5.0/24, generated by R4 or R5, the Area Border Routers for Area 2, its local area
    C.    R6 will have the network (type 2) LSA generated by R1 in Area 1 containing 10.1.5.0/24
    D.    R6 will have a summary (type 3) LSA containing 10.1.5.0/24, generated by either R2 or R3, the Area Border Routers for area 1.
    Answer: A
    Explanation:
    R6 in total stub area

    QUESTION 19
    Based on the network provided in the exhibit, how to route the traffic arriving at R1 for 10.1.3.1?

    clip_image003
    A.    through R3, since the path through R3 is through the backbone
    B.    through R2, because that is the only path available; no neighbor adjacency will be built between R1 and R2
    C.    through R1, since the path through R1 has the lowest hop count
    D.    through R1, since the path through R1 has the lowest total metric (10+10=20, versus 10+10+10=30 through R3)
    Answer: A
    Explanation:
    Choose route in intra-area 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.

    QUESTION 20
    Look at the following exhibit carefully, there is no route to 10.1.4.0/24 in the local routing table. According to the output of R1 in the exhibit, can you tell me why 10.1.4.0/24 is not in R1′s routing table?

    clip_image004
    A.    The forwarding address, 10.1.3.2, is also redistributed into OSPF, and an OSPF external route cannot use another OSPF external as its next hop
    B.    R3 is not redistributing 10.1.4.0/24 properly.
    C.    R2 is not properly configured as an Area Border Router
    D.    Area 1 is a stub area, and external routes cannot be originated in a stub area.
    Answer: A
    Explanation:
    LSA type 5 for 10.1.3.1

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