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    CCIE R&S 350-001 Q&As – Connectivity (21-27)

    By admin | June 18, 2014

    Tagged with:

    Section 8 – Connectivity

    QUESTION 21
    For the following LMI types, which three can be configured for use with Frame Relay on a Cisco router? (Choose three.)
    A.    Cisco
    B.    ANSI – Annex D
    C.    Q.931 – Annex B
    D.    Q.933 – Annex A
    Answer: ABD

    Explanation:
    ANSI-617d (ANSI or annex D) LMI type, DLCI 0
    : Serial1(in): Status, myseq 3
    : RT IE 1, length 1, type 0
    : KA IE 3, length 2, yourseq 4 , myseq 3
    : PVC IE 0×7 , length 0×3 , dlci 100, status 0×0
    : PVC IE 0×7 , length 0×3 , dlci 200, status 0×0
    Q933a (CCITT or annex A) LMI type, DLCI 0
    : Serial1(in): Status, myseq 1
    : RT IE 51, length 1, type 0
    : KA IE 53, length 2, yourseq 2 , myseq 1
    : PVC IE 0×57, length 0×3 , dlci 100, status 0×0
    : PVC IE 0×57, length 0×3 , dlci 200, status 0×0
    Cisco LMI type, DLCI 1023
    : Serial1(in): Status, myseq 68
    : RT IE 1, length 1, type 0
    : KA IE 3, length 2, yourseq 68, myseq 68
    : PVC IE 0×7 , length 0×6 , dlci 100, status 0×2 , bw 0
    : PVC IE 0×7 , length 0×6 , dlci 200, status 0×2 , bw 0

    QUESTION 22
    A user has no network connectivity. A check of the associated port indicates that the interface is up, the line protocol is down. Which item would most likely cause this problem?
    A.    Speed mismatch
    B.    Incorrect encapsulation
    C.    MTU set too low
    D.    Duplex mismatch
    Answer: A

    QUESTION 23
    In Frame Relay, FECN messages indicating congestion are sent or received by which of following?
    A.    Sent by the destination
    B.    Received by the sender
    C.    Received by the destination
    D.    Sent by the sender
    Answer: C
    Explanation:
    Congestion control
    The Frame Relay network uses a simplified protocol at each switching node. It achieves simplicity by omitting link-by-link flow-control. As a result, the offered load has largely determined the performance of Frame Relay networks. When offered load is high, due to the bursts in some services, temporary overload at some Frame Relay nodes causes a collapse in network throughput. Therefore, frame-relay networks require some effective mechanisms to control the congestion.
    Congestion control in frame-relay networks includes the following elements:
    Admission Control. This provides the principal mechanism used in Frame Relay to ensure the guarantee of resource requirement once accepted. It also serves generally to achieve high network performance. The network decides whether to accept a new connection request, based on the relation of the requested traffic descriptor and the network’s residual capacity. The traffic descriptor consists of a set of parameters communicated to the switching nodes at call set-up time or at service-subscription time, and which characterizes the connection’s statistical properties. The traffic descriptor consists of three elements:
    Committed Information Rate (CIR). The average rate (in bit/s) at which the network guarantees to transfer information units over a measurement interval T. This T interval is defined as: T = Bc/CIR.
    Committed Burst Size (BC). The maximum number of information units transmittable during the interval T.
    Excess Burst Size (BE). The maximum number of uncommitted information units (in bits) that the network will attempt to carry during the interval.
    Once the network has established a connection, the edge node of the Frame Relay network must monitor the connection’s traffic flow to ensure that the actual usage of network resources does not exceed this specification. Frame Relay defines some restrictions on the user’s information rate. It allows the network to enforce the end user’s information rate and discard information when the subscribed access rate is exceeded.
    Explicit congestion notification is proposed as the congestion avoidance policy. It tries to keep the network operating at its desired equilibrium point so that a certain Quality of Service (QoS) for the network can be met. To do so, special congestion control bits have been incorporated into the address field of the Frame Relay: FECN and BECN. The basic idea is to avoid data accumulation inside the network.
    FECN means Forward Explicit Congestion Notification. The FECN bit can be set to 1 to indicate that congestion was experienced in the direction of the frame transmission, so it informs the destination that congestion has occurred. BECN means Backwards Explicit Congestion Notification. The BECN bit can be set to 1 to indicate that congestion was experienced in the network in the direction opposite of the frame transmission, so it informs the sender that congestion has occurred.

    QUESTION 24
    Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports?
    A.    FCS errors
    B.    Runts
    C.    Multiple collisions
    D.    Alignment errors
    Answer: C

    QUESTION 25
    Phase I and Phase II DMVPN differ in terms of which of these characteristics?
    A.    Utilization of spoke-to-spoke dynamic tunnels
    B.    Utilization of multipoint GRE tunnels at the hub site
    C.    Utilization of hub-to-spoke dynamic tunnels
    D.    Support for multicast
    Answer: A
    Explanation:
    DMVPN Phases
    Phase 1: Hub and spoke functionality
    Phase 2: Spoke-to-spoke functionality
    Phase 3: Architecture and scaling
    DMVPN Phase 1 Benefits ?Simplified and Smaller Configsfor Hub and Spoke ?Zero touch provisioning for adding spokes to the VPN ?Easily supports dynamically addressed CPEs
    DMVPN Phase 2 Benefits –Future Functionality ?On-demand spoke-to-spoke tunnels –avoids dual encrypts/decrypts?Smaller spoke CPE can participate in the virtual full mesh

    QUESTION 26
    For the following options, whoch feature monitors the level of each traffic type in 1 second intervals
    A.    Uplink Fast
    B.    Port Aggregation Protocol
    C.    Storm Control
    D.    Port Fast
    Answer: C
    Explanation:
    A traffic storm occurs when packets flood the LAN, creating excessive traffic and degrading network performance. The traffic storm control feature prevents LAN ports from being disrupted by a broadcast, multicast, or unicast traffic storm on physical interfaces.
    Traffic storm control (also called traffic suppression) monitors incoming traffic levels over a 1-second traffic storm control interval and, during the interval, compares the traffic level with the traffic storm control level that you configure. The traffic storm control level is a percentage of the total available bandwidth of the port. Each port has a single traffic storm control level that is used for all types of traffic (broadcast, multicast, and unicast).
    Traffic storm control monitors the level of each traffic type for which you enable traffic storm control in 1-second traffic storm control intervals. Within an interval, when the ingress traffic for which traffic storm control is enabled reaches the traffic storm control level that is configured on the port, traffic storm control drops the traffic until the traffic storm control interval ends.

    QUESTION 27
    Which four commands are required when implementing DMVPN?
    A.    crypto iskamp policy
    B.    crypto ipsec transform
    C.    crypto ipsec profile
    D.    gre tunnel interface
    E.    crypto acl
    F.    easy vpn
    Answer: ABCD

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