Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 541:

  Refer to the exhibit.

  

  Which statement is true?

  A. R2 is directly connected to the receiver for this group and is the winner of an assert mechanism.
  B. R2 is directly connected to the receiver for this group, and it forwards the traffic onto Ethernet3/0, but it is forwarding duplicate traffic onto Ethernet3/0.
  C. R2 has the A flag (Accept flag) set on Ethernet 3/0. This is fine, since the group is in BIDIR-PIM mode.
  D. R2 is directly connected to the receiver for this group and is the loser of an assert mechanism.
  E. The A flag is set until the SPT threshold is reached for this multicast group.
  A. R2 is directly connected to the receiver for this group and is the winner of an assert mechanism.

  ---

  show ip mroute Field Descriptions Field Description

  RPF neighbor or RPF nbr IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used. If an asterisk (*) appears after the IP address in this field, the RPF neighbor has been learned through an assert.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult 3.html

• Question 542:

  Refer to the exhibit.

  

  R3 is failing to join the multicast group 224.1.1.1 that is sourcing from R1. Which two actions can you take to allow multicast traffic to flow correctly? (Choose two.)

  A. Remove the static multicast route on R1.
  B. Configure OSPF on R1 and R3 to include the tunnel interfaces.
  C. Add an additional static multicast route on R2 for multicast group 224.1.1.1 toward R3.
  D. Replace the static multicast route on R1 to send traffic toward R2.
  E. Remove the static unicast route on R1.
  F. Add an additional static unicast route on R2 toward the loopback interface of R3.
  A. Remove the static multicast route on R1.
  B. Configure OSPF on R1 and R3 to include the tunnel interfaces.

  ---

  Since the tunnel interfaces are not part of OSPF, the best path to the multicast source of R1 from R3 would be over the Gi0/0 path via OSPF. However, the static mroute is configured to use the tunnel, so this causes an RPF failure used in Sparse Mode. Best fix is to add the tunnel interfaces into OSPF and remove the static mroute so that that the RPF check no longer fails.

• Question 543:

  Which statement about shaped round robin queuing is true?

  A. Queues with higher configured weights are serviced first.
  B. The device waits a period of time, set by the configured weight, before servicing the next queue.
  C. The device services a single queue completely before moving on to the next queue.
  D. Shaped mode is available on both the ingress and egress queues.
  A. Queues with higher configured weights are serviced first.

  ---

  SRR is scheduling service for specifying the rate at which packets are dequeued. With SRR there are two modes, shaped and shared. Shaped mode is only available on the egress queues SRR differs from typical WRR. With WRR queues are serviced based on the weight. Q1 is serviced for weight 1 period of time, Q2 is served for weight 2 period of time, and so forth. The servicing mechanism works by moving from queue to queue and services them for the weighted amount of time. With SRR weights are still followed; however, SRR services Q1, moves to Q2, then Q3 and Q4 in a different way. It does not wait at and service each queue for a weighted amount of time before moving on to the next queue. Instead, SRR makes several rapid passes at the queues; in each pass, each queue might or might not be serviced. For each given pass, the more highly weighted queues are more likely to be serviced than the lower priority queues.

  Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3560-e- series-switches/prod_qas0900aecd805bacc7.html

• Question 544:

  When deploying redundant route reflectors in BGP, which attribute can you configure on the route reflector to allow routes to be identified as belonging to the same group?

  A. ROUTER_ID
  B. CLUSTER_ID
  C. ORIGINATOR_ID
  D. PEER_GROUP
  B. CLUSTER_ID

  ---

  Together, a route reflector and its clients form a cluster. When a single route reflector is deployed in a cluster, the cluster is identified by the router ID of the route reflector. The bgp cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables.

  Reference: http://ieoc.com/forums/t/5326.aspx

• Question 545:

  Which two statements about IP SLAs are true? (Choose two.)

  A. They are Layer 2 transport independent.
  B. Statistics are collected and stored in the RIB.
  C. Data for the delay performance metric can be collected both one-way and round-trip.
  D. Data can be collected with a physical probe.
  E. They are used primarily in the distribution layer.
  A. They are Layer 2 transport independent.
  E. They are used primarily in the distribution layer.

• Question 546:

  Two routers are trying to establish an OSPFv3 adjacency over an Ethernet link, but the adjacency is not forming. Which two options are possible reasons that prevent OSPFv3 to form between these two routers? (Choose two.)

  A. mismatch of subnet masks
  B. mismatch of network types
  C. mismatch of authentication types
  D. mismatch of instance IDs
  E. mismatch of area types
  D. mismatch of instance IDs
  E. mismatch of area types

  ---

  An OSPFv3 interface must have a compatible configuration with a remote interface before the two can be considered neighbors. The two OSPFv3 interfaces must match the following criteria: Hello interval ?

  Dead interval

  ?

  Area ID ?

  Optional capabilities The OSPFv3 header includes an instance ID field to identify that OSPFv3 packet for a particular OSPFv3 instance. You can assign the OSPFv3 instance. The interface drops all OSPFv3 packets that do not have a matching OSPFv3 instance ID in the packet header.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx- os/unicast/configuration/guide/l3_cli_nxos/l3_ospfv3.html

• Question 547:

  In the DiffServ model, which class represents the lowest priority with the highest drop probability?

  A. AF11
  B. AF13
  C. AF41
  D. AF43
  B. AF13

  ---

  Assured Forwarding (AF) Behavior Group

  Class 1

  Class 2

  Class 3

  Class 4

  Low Drop

  AF11 (DSCP 10)

  AF21 (DSCP 18)

  AF31 (DSCP 26)

  AF41 (DSCP 34)

  Med Drop

  AF12 (DSCP 12)

  AF22 (DSCP 20)

  AF32 (DSCP 28)

  AF42 (DSCP 36)

  High Drop

  AF13 (DSCP 14)

  AF23 (DSCP 22)

  AF33 (DSCP 30)

  AF43 (DSCP 38)

  Reference: http://en.wikipedia.org/wiki/Differentiated_services

• Question 548:

  Which three statements about EIGRP and BFD are true? (Choose three.)

  A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP.
  B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane.
  C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection.
  D. BFD is tied to specific routing protocols and can be used for generic fault detection for the OSPF, EIGRP, and BGP routing protocols.
  E. BFD is dependent on the EIGRP routing protocol, so it can be used as a specific failure detection mechanism.
  F. BFD resides on the control plane, so it is less CPU-intensive than if it resided on the data plane.
  A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP.
  B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane.
  C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection.

  ---

  There are several advantages to implementing BFD over reduced timer mechanisms for routing protocols:

  Although reducing the EIGRP, IS-IS, and OSPF timers can result in minimum detection timer of one to two seconds, BFD can provide failure detection in less than one second.

  Because BFD is not tied to any particular routing protocol, it can be used as a generic and consistent failure detection mechanism for EIGRP, IS-IS, and OSPF.

  Because some parts of BFD can be distributed to the data plane, it can be less CPU- intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html

• Question 549:

  DRAG DROP

  Drag and drop the SNMP element on the left to the corresponding definition on the right.

  Select and Place:

  

  

• Question 550:

  Refer to the exhibit.

  

  Which two routes are included in the route update? (Choose two.)

  A. 10.3.0.0
  B. 10.3.2.0
  C. 10.3.4.0
  D. 10.3.6.0
  E. 10.3.3.0
  C. 10.3.4.0
  D. 10.3.6.0

  ---

  This access list will permit the 10.3.4.0, 10.3.5.0, 10.3.6.0, and 10.3.7.0 subnets.