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    CCIE R&S 350-001 Q&As – Connectivity (11-15)

    By admin | June 18, 2014

    Tagged with:

    Section 8 – Connectivity

    QUESTION 11
    Refer to the exhibit. Look at the command output. What can you use to prevent this behavior?
    A.    UDLD
    B.    spanning-tree loopguard
    C.    VTP mode transparent
    D.    switchport mode desirable
    Answer: A

    QUESTION 12
    The EtherChannel between your LAN switch and the Internet router is not load-balancing efficiently. On the switch, there are several workstations with valid IP ranges. Which load-balance algorithms can you use in the switch in order to optimize this load balancing? (Choose four.)
    A.    source IP address
    B.    destination IP address
    C.    per-packet load balance
    D.    destination MAC address
    E.    source MAC address
    Answer: ABDE
    Explanation:
    EtherChannel load balancing can use MAC addresses, IP addresses, or Layer 4 port numbers with a Policy Feature Card 2 (PFC2) and either source mode, destination mode, or both. The mode you select applies to all EtherChannels that you configure on the switch. Use the option that provides the greatest variety in your configuration. For example, if the traffic on a channel only goes to a single MAC address, use of the destination MAC address results in the choice of the same link in the channel each time. Use of source addresses or IP addresses can result in a better load balance. Issue the port-channel load-balance {src-mac | dst-mac | src-dst-mac | src-ip | dst-ip | src-dst-ip | src-port | dst-port | src-dst-port | mpls} global configuration command in order to configure the load balancing.
    Issue the show etherchannel load-balance command in order to check the frame distribution policy. You can determine which interface in the EtherChannel forwards traffic, with the frame distribution policy as a basis. Issue the remote login switch command to log in remotely to the Switch Processor (SP) console in order to make this determination. Then, issue the test etherchannel load-balance interface port-channel number {ip | l4port | mac} [source_ip_add | source_mac_add | source_l4_port] [dest_ip_add | dest_mac_add | dest_l4_port] command.

    QUESTION 13
    Customer X has a hub-and-spoke Frame Relay network, with a central office and two branch offices (RemoteA and RemoteB). Each location has only one physical link to the Frame Relay cloud and RemoteB has a router that is not a Cisco router. Since the installation, there is no connectivity between RemoteB and the central office. What is a possible solution to this issue?
    A.    Because Frame Relay IETF encapsulation is only configurable at interface level, you must use IETF encapsulation on all routers.
    B.    This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the central office.
    C.    The router at RemoteB must be replaced by a Cisco router.
    D.    Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.
    E.    There is a problem in the Frame Relay cloud, because Cisco routers are compatible with IETF Frame Relay.
    Answer: D
    Explanation:
    Cisco supports two different Frame Relay encapsulation types. The default Frame Relay encapsulation enabled on supported interfaces is the Cisco encapsulation. Cisco also supports the IETF Frame Relay encapsulation type, which is in conformance with RFC 1490 and RFC 2427. RFC 2427 supercedes RFC 1490. Both RFC specifications define standards allowing multiple routed protocols to be carried over Frame Relay. Readers can refer to http://www.faqs.org/rfcs/rfc2427.html andhttp://www.faqs.org/rfcs/rfc1490.html for references on both RFCs.

    QUESTION 14
    You are deploying two core switches, one in each building, 50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state, and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up?
    A.    The switches are not the same model.
    B.    You are not using the correct SFP.
    C.    You are not using correct optical media converters.
    D.    Configuration should be modified, because the distance is longer.
    Answer: B

    QUESTION 15
    You are configuring an 802.1Q trunk between a Layer 2 switch and a firewall. You read in the documentation that the best way to set up a trunk is to set the port as dynamic desirable. The trunk is not coming up. Which one of these options would be a valid explanation?
    A.    The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode ON.
    B.    The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode to OFF.
    C.    The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode as auto.
    D.    The firewall does not support DTP. You should set the switchport trunk mode to ON.
    Answer: D

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