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    [New AmazonExam Dumps] Recently Published Exam 300-101 11-20 Cisco CCNP Routing and Switching ROUTE Exam VCE and PDF Dumps For Free Share

    By admin | December 11, 2015

    Tagged with:

    QUESTION 11

    A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe?

    A. latency

    B. starvation

    C. connectionless communication

    D. nonsequencing unordered packets

    E. jitter

    Correct Answer: A

    Section: (none)

    Explanation

    Explanation/Reference:

    Explanation/Reference:

    Explanation:

    Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement operation can monitor against a pre-set performance threshold.

    Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed.

    Several SNMP traps are available: round trip time,average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.

    Here is a partial sample output from the IP SLA statistics that can be seen:

    router#show ip sla statistics 1

    Round Trip Time (RTT) for Index 55

    Latest RTT: 1 ms

    Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005 Latest operation return code: OK

    RTT Values:

    Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time:

    Number of Latency one-way Samples: 0

    Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds Reference:

    http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a00802d5efe.html

    QUESTION 12

    Under which condition does UDP dominance occur?

    A. when TCP traffic is in the same class as UDP

    B. when UDP flows are assigned a lower priority queue

    C. when WRED is enabled

    D. when ACLs are in place to block TCP traffic

    Correct Answer: A

    Section: (none)

    Explanation

    Explanation/Reference:

    Explanation/Reference:

    Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when drops are detected. Although some UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower transmission rates because of dropping. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion, TCP flows continually lower their transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP- based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider class, the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows. Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS- SRND-Book/VPNQoS.html

    QUESTION 13

    Prior to enabling PPPoE in a virtual private dialup network group, which task must be completed?

    A. Disable CDP on the interface.

    B. Execute the vpdn enable command.

    C. Execute the no switchport command.

    D. Enable QoS FIFO for PPPoE support.

    Correct Answer: B

    Section: (none)

    Explanation

    Explanation/Reference:

    Explanation/Reference:

    Explanation:

    Enabling PPPoE in a VPDN Group

    Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.

    Restrictions

    This task applies only to releases prior to Cisco IOS Release 12.2(13)T.

    SUMMARY STEPS

    1.

    enable

    2.

    configure terminal

    3.

    vpdn enable

    4.

    vpdn-group name

    5.

    request-dialin

    6.

    protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC mode. Example: · Enter your password if Router> enable prompted. Step 2 configure terminal Enters global configuration mode. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private dialup Example: networking. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN group with a Example: customer or VPDN profile. Router(config)# vpdn-group group1 Step 5 request-dialin Creates a request-dialin VPDN Example: subgroup. Router(config-vpdn)# request-dialin Step 6 protocol pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol pppoe

    Reference:

    http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island_of_Content_Chapter.html

    QUESTION 14

    A network engineer has been asked to ensure that the PPPoE connection is established and authenticated using an encrypted password. Which technology, in combination with PPPoE, can be used for authentication in this manner?

    A. PAP

    B. dot1x

    C. IPsec

    D. CHAP

    E. ESP

    Correct Answer: D

    Section: (none)

    Explanation

    Explanation/Reference:

    Explanation/Reference:

    Explanation: With PPPoE, the two authentication options are PAP and CHAP. When CHAP is enabled on an interface and a remote device attempts to connect to it, the access server sends a CHAP packet to the remote device. The CHAP packet requests or "challenges" the remote device to respond. The challenge packet consists of an ID, a random number, and the host name of the local router. When the remote device receives the challenge packet, it concatenates the ID, the remote device’s password, and the random number, and then encrypts all of it using the remote device’s password. The remote device sends the results back to the access server, along with the name associated with the password used in the encryption process. When the access server receives the response, it uses the name it received to retrieve a password stored in its user database. The retrieved password should be the same password the remote device used in its encryption process. The access server then encrypts the concatenated information with the newly retrieved password–if the result matches the result sent in the response packet, authentication succeeds. The benefit of using CHAP authentication is that the remote device’s password is never transmitted in clear text (encrypted). This prevents other devices from stealing it and gaining illegal access to the ISP’s network. Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfathen.ht ml

    QUESTION 15

    A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists. Which feature can be used to accomplish this task?

    A. TCP Adjust

    B. Dialer Persistent

    C. PPPoE Groups

    D. half-bridging

    E. Peer Neighbor Route

    Correct Answer: B

    Section: (none)

    Explanation

    Explanation/Reference:

    Explanation/Reference:

    Explanation:

    A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:

    Command Purpose

    Step 1 Router(config)# interface dialer Creates a dialer interface and number enters interface

    configuration

    mode.

    Step 2 Router(config-if)# ip address Specifies the IP address and mask address mask of the dialer interface as a node in the destination network to be called.

    Step 3 Router(config-if)# encapsulation Specifies the encapsulation type.

    type

    Step 4 Router(config-if)# dialer string Specifies the remote destination to dial-string class class-name call and the map class that defines characteristics for calls to this destination.

    Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination.

    Step 6 Router(config-if)# dialer-group Assigns the dialer interface to a group-number dialer group.

    Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol- number or by protocol and list name {permit | deny | list number to define the interesting access-list-number} packets that can trigger a call.

    Step 8 Router(config-if)# dialer (Optional) Specifies the remote-name user-name authentication name of the remote router on the destination subnetwork for a dialer interface.

    Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] connected at all times, even in seconds | max-attempts the absence of interesting traffic.number]

    Reference:

    http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia_dialer_persist.html

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