Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 441:

  What is the new designation for the MPLS EXP (experimental) bits?

  A. QoS bits
  B. traffic class bits
  C. flow bits
  D. precedence bits
  B. traffic class bits

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  To avoid misunderstanding about how this field may be used, it has become increasingly necessary to rename this field. This document changes the name of the EXP field to the "Traffic Class field" ("TC field"). In doing so, it also updates documents that define the current use of the EXP field.

  Reference: https://tools.ietf.org/html/rfc5462

• Question 442:

  Which multicast protocol uses source trees and RPF?

  A. DVMRP
  B. PIM sparse mode
  C. CBT
  D. mOSPF
  A. DVMRP

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  DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast packets are initially flooded down this source tree. If redundant paths are on the

  source tree, packets are not forwarded along those paths. Forwarding occurs until prune messages are received on those parent-child links, which further constrains the broadcast of multicast packets.

  Reference: DVMRP and dense-mode PIM use only source trees and use RPF as previously described.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12- 1_19_ea1/configuration/guide/3550scg/swmcast.html

• Question 443:

  How many hash buckets does Cisco Express Forwarding use for load balancing?

  A. 8
  B. 16
  C. 24
  D. 32
  B. 16

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  In order to understand how the load balance takes place, you must first see how the tables relate. The Cisco Express Forwarding table points to 16 hash buckets (load share table), which point to the adjacency table for parallel paths. Each packet to be switched is broken up into the source and destination address pair and checked against the loadshare table.

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/18285- loadbal-cef.html

• Question 444:

  Which three protocols support SSM? (Choose three.)

  A. IGMPv2
  B. IGMPv3
  C. IGMP v3lite
  D. URD
  E. CGMP
  F. IGMPv1
  B. IGMPv3
  C. IGMP v3lite
  D. URD

• Question 445:

  In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.)

  A. It sets the MAC table aging time to max_age time.
  B. It sets the MAC table aging time to forward_delay time.
  C. It recalculates the STP topology upon receiving topology change notification from the root switch.
  D. It does not recalculate the STP topology upon receiving topology change notification from the root switch.
  B. It sets the MAC table aging time to forward_delay time.
  D. It does not recalculate the STP topology upon receiving topology change notification from the root switch.

• Question 446:

  DRAG DROP

  Drag and drop the path-selection criteria on the left into the correct route-selection order on the right, that a router will use when having multiple routes toward the same destination.

  Select and Place:

  

  

• Question 447:

  What are the two Cisco recommended methods for reducing the size of the TCAM on a Layer 3 switch?

  A. Use the ip route profile command.
  B. Adjust the output queue buffers.
  C. Filter unwanted routes.
  D. Optimize the SDM template.
  E. Use summary routes.
  C. Filter unwanted routes.
  E. Use summary routes.

• Question 448:

  Which two discovery mechanism does LDP support? (Choose two.)

  A. strict
  B. extended
  C. loose
  D. targeted
  E. basic
  B. extended
  E. basic

• Question 449:

  Which statement about the function of poison reverse in EIGRP is true?

  A. It tells peers to remove paths that previously might have pointed to this router.
  B. It tells peers to remove paths to save memory and bandwidth.
  C. It provides reverse path information for multicast routing.
  D. It tells peers that a prefix is no longer reachable.
  A. It tells peers to remove paths that previously might have pointed to this router.

  ---

  Poison Reverse in EIGRP states: "Once you learn of a route through an interface, advertise it as unreachable back through that same interface". For more information please read here. http://www.cisco.com/c/en/us/support/docs/ip/enhancedinterior-gateway-routing- protocol-eigrp/16406-eigrp-toc.html#splithorizon.

• Question 450:

  Which three statements about OSPFv3 address families are true? (Choose three.)

  A. Each address family requires the same instance ID.
  B. Address families can perform route redistribution into any IPv4 routing protocol.
  C. An address family can have two device processes on each interface.
  D. IPv4 address family require an IPv4 address to be configured on the interface.
  E. Each address family uses a different shortest path tree.
  F. Different address families can share the same link state database.
  B. Address families can perform route redistribution into any IPv4 routing protocol.
  D. IPv4 address family require an IPv4 address to be configured on the interface.
  E. Each address family uses a different shortest path tree.