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    CCIE R&S 350-001 Q&As – Implement EIGRP (EIGRP) (6-10)

    By admin | June 18, 2014

    Tagged with:

    Section 7 – Implement EIGRP (EIGRP)

    QUESTION 6
    Refer to the exhibit. Router E learned about the PIM RP (designated as 7.7.7.7) from four different sources. Routers A and D advertised the 7.0.0.0 network via EIGRP. Routers B and C advertised the 7.0.0.0 network via OSPF. Considering that all four Ethernet interfaces on
    router E could potentially lead back to the PIM-RP, when router E receives the first multicast packet down the shared tree, which incoming interface will be used to successfully pass the RPF check?

    clip_image001

    A.    E0
    B.    E1
    C.    E2
    D.    E3
    E.    None of these interfaces will be used to successfully pass the RPF check.
    F.    All of these interfaces would successfully pass the RPF check.
    Answer: A
    Explanation:
    On a shared LAN segment, amongst the PIM enabled routers, a selected router must assume the responsibilty for i) sending any PIM register/prune messages to the RP and for ii) sending IGMP query messages.
    I was until recently under the misunderstanding that the PIM DR router performed both of these functions – wrong!! These functions are completely decoupled and in fact they have a different election process and selection criteria.
    First the Querier Election Process.
    At start up each router sends a query message to the all systems group 224.0.0.1 from its own interface address. The router with the lowest ip address is elected IGMP querier.
    Second the PIM DR Election Process
    The router with the highest ip address is elected as PIM DR. This selection process can also be influenced by configuring a pim DR priority. By default all routers have priority 1, hence highest ip address wins by default. However if DR priority is used then highest DR priority wins.

    QUESTION 7
    In your Cisco EIGRP network, you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur? (Choose two.)
    A.    An update packet with init flag set from a known, already established neighbor relationship was received by one of the routers.
    B.    The ARP cache was cleared.
    C.    The counters were cleared.
    D.    The IP EIGRP neighbor relationship was cleared manually.
    Answer: AD
    Explanation:
    The following are the most common causes of problems with EIGRP neighbor relationships:
    Unidirectional link
    Uncommon subnet, primary, and secondary address mismatch
    Mismatched masks
    K value mismatches
    Mismatched AS numbers
    Stuck in active
    Layer 2 problem
    Access list denying multicast packets
    Manual change (summary router, metric change, route filter)
    According til Ivan Pepelnjak’s book "EIGRP Network Design Solutions" the Init flag is set in the initial update packet when to neighbors discover each other and start their initial topology table exchange.
    There are two basic purposes for the init flag. First, it’s a part of the three way handshake that eigrp uses when building an adjacency.
    – Router B comes up on a wire.
    – Router A receives Router B’s hello, and places it in "pending" state. This is a not completely formed adjacency; as long as B is in this state, A won’t send any routing information to it.
    – Router A sends an empty unicast update with the init bit set.
    – Router B receives this update with the init bit set, and places Router A in the "pending" state.
    – Router B now transmits an empty update with the init bit set, unicast, to A. This empty update also contains the acknowledgement for Router A’s init update (that this ack is piggybacked is an integral part of the three way handshake process).
    – Router A, on receiving this init update, places Router B in the "neighbor" state, and sends an acknowledgement for the init update from Router B.
    – Router B receives this ack, and places A in "neighbor" state.
    The two routers can now exchange routing information, knowing they have full two way connectivity between them.
    The second use of the init bit is more esoteric. Suppose you have Routers A and B, running along fine, for many hours. Router A reloads, but comes back up before Router B’s hold timer has expired. When Router B sees A’s hellos, it will assume that A just missed a couple, and everything is fine. But everything isn’t fine–A just lost all of its routing information! How can A signal this state, and as B to resynchronize?
    A can send an empty update, with the init bit set. This causes Router B to place A in the "pending" state, and wipe out all the information it’s learned from A (unless, of course, graceful restart is configured/etc).

    QUESTION 8
    Two routers are connected by a serial link, and are configured to run EIGRP on all interfaces. You examine the EIGRP neighbor table on both routers (using the show ip eigrp neighbor command) and see that the router connected over the serial link is listed as a neighbor for a certain amount of time, but is periodically removed from the neighbor table. None of the routes from the neighbor ever seem to be learned, and the neighbor transmission statistics (SRTT, RTO, and Q Count) seem to indicate that no packets are being transmitted between the neighbors. Which would most likely cause this problem?
    A.    While multicast packets are being successfully sent over the link, unicast packets are not
    B.    There is a bug in the EIGRP code that needs to be fixed.
    C.    This is correct behavior for the first few minutes of EIGRP neighbor formation. After four or five cycles, it should straighten itself out and the neighbor
    D.    The hello or hold intervals are set differently on the two routers.
    Answer: A
    Explanation:
    EIGRP uses five packet types:
    Hello/Acks
    Updates
    Queries
    Replies
    Requests
    Hellos are multicast for neighbor discovery/recovery. They do not require acknowledgment. A hello with no data is also used as an acknowledgment (ack). Acks are always sent using a unicast address and contain a non-zero acknowledgment number.
    Updates are used to convey reachability of destinations. When a new neighbor is discovered, update packets are sent so the neighbor can build up its topology table. In this case, update packets are unicast. In other cases, such as a link cost change, updates are multicast. Updates are always transmitted reliably.
    Queries and replies are sent when destinations go into Active state. Queries are always multicast unless they are sent in response to a received query. In this case, it is unicast back to the successor that originated the query. Replies are always sent in response to queries to indicate to the originator that it does not need to go into Active state because it has feasible successors. Replies are unicast to the originator of the query. Both queries and replies are transmitted reliably.
    Request packets are used to get specific information from one or more neighbors. Request packets are used in route server applications. They can be multicast or unicast. Requests are transmitted unreliably.

    QUESTION 9
    Which two steps below should you perform on the hub router while configuring EIGRP routing over DMVPN (mGRE tunnel)? (Choose two.)
    A.    Set the NHRP hold time to match the EIGRP hold time
    B.    Add the enable eigrp stub command
    C.    Add the disable eigrp as-member split-horizon command
    D.    Add the disable eigrp as-member next-hop-self command
    Answer: CD
    Explanation:
    to stop EIGRP from assigning the hub as the next hop for all routes.
    If you dont disable split horizon on the tunnel interface you will only see the routes the hub itself is responsible for from a spoke router. When configuring a EIGRP AS you use the tunnel network id as a network you want to participate on with EIGRP.

    QUESTION 10
    On the basis of the exhibit provided, assuming that EIGRP is the routing protocol, then at R5, what would be the status of each path to 172.30.1.0/24?

    clip_image002
    A.    the path through R3 would be the successor, the path through R1 would be a feasible successor, and the path through R4 would be neither a successor nor a feasible successor
    B.    not enough information has been given to figure out what the status of each route would be
    C.    the path through R3 would be the successor, and the paths through R1 and R4 would be feasible successors
    D.    the path through R1 would be the successor, the path through R3 would be a feasible successor, and the path through R4 would be neither a successor nor feasible successor
    Answer: A
    Explanation:
    EIGRP – bandwidth and Delay metrics by default

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