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    CCIE R&S 350-001 Q&As – Connectivity (16-20)

    By admin | June 18, 2014

    Tagged with:

    Section 8 – Connectivity

    QUESTION 16
    Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards, the exhibit shows your configuration in a local switch1. However, EtherChannel is not coming up. Which one of these statements could be a possible reason?
    A.    EtherChannel is only available in Cisco equipment.
    B.    The customer side is supposed to be running PAgP, which is a Cisco standard.
    C.    PAgP is not an IEEE standard. VRRP should be used.
    D.    The configuration on switch1 needs to be modified to use LACP.
    Answer: D

    QUESTION 17
    Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit, what could be the most likely cause of the problem?
    A.    Ethernet interfaces were configured as point-to-point.
    B.    Process IDs are not matching.
    C.    Configured bandwidths do not match on both interfaces.
    D.    Broadcasts and multicast are not being propagated over the Ethernet services.
    E.    OSPF cost does not match on both interfaces.
    Answer: D

    QUESTION 18
    Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider?
    A.    OSPF standard hellos
    B.    Cisco Discovery Protocol link detection
    C.    Bidirectional Forwarding Detection
    D.    Fast Link Pulse
    E.    autonegotiation
    Answer: C
    Explanation:
    BFD is a detection protocol designed to provide fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing protocols. In addition to fast forwarding path failure detection, BFD provides a consistent failure detection method for network administrators. Because the network administrator can use BFD to detect forwarding path failures at a uniform rate, rather than the variable rates for different routing protocol hello mechanisms, network profiling and planning will be easier, and reconvergence time will be consistent and predictable.
    Cisco Express Forwarding (CEF) and IP routing must be enabled on all participating routers.
    You must enable Cisco Parallel eXpress Forwarding (PXF) on the Cisco 10720 Internet router in order for BFD to operate properly. PXF is enabled by default and is generally not turned off.
    One of the IP routing protocols supported by BFD must be configured on the routers before BFD is deployed.

    QUESTION 19
    When troubleshooting a network, the output of the command show interfaces indicates a large number of runts. What is a runt?
    A.    the number of packets that are discarded because they exceed the maximum packet size of the medium
    B.    errors created when the CRC generated by the originating LAN station or far-end device does not match the checksum calculated from the data received.
    C.    the number of packets that are discarded because they are smaller than the minimum packet size of the medium
    D.    the number of received packets that were ignored by the interface because the interface hardware ran low on internal buffers
    E.    the number of times that the interface requested another interface within the router to slow down
    Answer: C
    Explanation:
    In networks, a runt is a packet that is too small. For example, the Ethernet protocol requires that each packet be at least 64 bytes long. In Ethernet, which operates on the idea that two parties can attempt to get use of the line at the same time and sometimes do, runts are usually the fragments of packet collisions. Runts can also be the result of bad wiring or electrical interference. Runts are recorded by programs that use the Remote Network Monitoring (RNM) standard information base for network adminstration. RMON calls them "undersize packets".
    A giant is a packet that’s oversize.

    QUESTION 20
    You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network, you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future, particularly when connecting and reconnecting fiber pairs?
    A.    Only use fiber in pairs.
    B.    Configure root guard on your switches.
    C.    Do not use fiber but use copper.
    D.    Configure UDLD to prevent one-way link conditions.
    Answer: D
    Explanation:
    UDLD is a Layer 2 protocol that enables devices connected through fiber-optic or twisted-pair Ethernet cables to monitor the physical configuration of the cables and detect when a unidirectional link exists. All connected devices must support UDLD for the protocol to successfully identify and disable unidirectional links. When UDLD detects a unidirectional link, it administratively shuts down the affected port and alerts you. Unidirectional links can cause a variety of problems, including spanning-tree topology loops.

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