Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 431:

  Which statement about the bgp soft-reconfig-backup command is true?

  A. It requires BGP to store all inbound and outbound updates.
  B. It overrides soft reconfiguration for devices that support inbound soft reconfiguration.
  C. When the peer is unable to store updates, the updates are implemented immediately.
  D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh.
  E. It provides outbound soft reconfiguration for peers.
  D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh.

• Question 432:

  Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence?

  A. LSA throttling
  B. incremental SPF
  C. fast hello
  D. SPF tuning
  A. LSA throttling

  ---

  The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds.

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

• Question 433:

  Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.)

  A. Because the delay metric provides better handling for bursty traffic
  B. Because manipulating the bandwidth metric can also affect QoS
  C. Because manipulating the bandwidth affects only a particular path
  D. Because changes to the delay metric are propagated to all neighbors on a segment
  B. Because manipulating the bandwidth metric can also affect QoS
  D. Because changes to the delay metric are propagated to all neighbors on a segment

  ---

  Using the bandwidth to influence EIGRP paths is discouraged for two reasons:

  Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface. EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the

  bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back.

  Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection

  Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway- routing-protocol-eigrp/13673-14.html

• Question 434:

  Refer to the exhibit.

  

  This is the configuration of the ASBR of area 110.Which option explains why the remote ABR should not translate the type 7 LSA for the prefix 192.168.0.0/16 into a type 5 LSA?

  A. The remote ABR translates all type 7 LSA into type 5 LSA, regardless of any option configured in the ASBR.
  B. The ASBR sets the forwarding address to 0.0.0.0 which instructs the ABR not to translate the LSA into a type 5 LSA.
  C. The ASBR originates a type 7 LSA with age equal to MAXAGE 3600.
  D. The ABR clears the P bit in the header of the type 7 LSA for 192.168.0.0/16.
  D. The ABR clears the P bit in the header of the type 7 LSA for 192.168.0.0/16.

  ---

  When external routing information is imported into an NSSA, LSA Type 7 is generated by the ASBR and it is flooded within that area only. To further distribute the external information, type 7 LSA is translated into type 5 LSA at the NSSA border. The P-bit in LSA Type 7 field indicates whether the type 7 LSA should be translated. This P-bit is automatically set by the NSSA ABR (also the Forwarding Address (FA) is copied from Type 7 LSA). The P-bit is not set only when the NSSA ASBR and NSSA ABR are the same router for the area. If bit P = 0, then the NSSA ABR must not translate this LSA into Type 5. The nssa-only keyword instructs the device to instigate Type-7 LSA with cleared P-bit, thereby, preventing LSA translation to Type 5 on NSSA ABR device. Note. If a router is attached to another AS and is also an NSSA ABR, it may originate a both a type-5 and a type-7 LSA for the same network. The type-5 LSA will be flooded to the backbone and the type-7 will be flooded into the NSSA. If this is the case, the P-bit must be reset (P=0) in the type-7 LSA so the type-7 LSA isn't again translated into a type- 5 LSA by another NSSA ABR.

  Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15- e/iro-15-e-book/iro-ospfv3-nssa-cfg.html

• Question 435:

  Which statement about OTV is true?

  A. The overlay interface becomes active only when configuration is complete and it is manually enabled.
  B. OTV data groups can operate only in PIM sparse-mode.
  C. The overlay interface becomes active immediately when it is configured.
  D. The interface facing the OTV groups must be configured with the highest MTU possible.
  A. The overlay interface becomes active only when configuration is complete and it is manually enabled.

  ---

  OTV has the following configuration guidelines and limitations:

  If the same device serves as the default gateway in a VLAN interface and the OTV edge device for the VLANs being extended, configure OTV on a device (VDC or switch) that is separate from the VLAN interfaces (SVIs). When possible, we

  recommend that you use a separate nondefault VDC for OTV to allow for better manageability and maintenance. An overlay interface will only be in an up state if the overlay interface configuration is complete and enabled (no shutdown). The

  join interface has to be in an up state.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx- os/OTV/config_guide/b_Cisco_Nexus_7000_Series_NX- OS_OTV_Configuration_Guide/basic-otv.html

• Question 436:

  DRAG DROP

  Drag and drop the BGP attribute on the left to the correct category on the right.

  Select and Place:

  

  

• Question 437:

  Refer to the exhibit.

  

  Which statement about this COS-DSCP mapping is true?

  A. The expedited forwarding DSCP is mapped to COS 3.
  B. COS 16 is mapped to DSCP 2.
  C. The default COS is mapped to DSCP 32.
  D. This mapping is the default COS-DSCP mapping on Cisco switches.
  A. The expedited forwarding DSCP is mapped to COS 3.

  ---

  Here we see that COS 3 is mapped to DSCP 46, which is the Expedited forwarding class:

  The Expedited Forwarding (EF) model is used to provide resources to latency (delay) sensitive real-time, interactive traffic. The EF model uses one marking -- DSCP 46.

• Question 438:

  Which two options are causes of out-of-order packets? (Choose two.)

  A. a routing loop
  B. a router in the packet flow path that is intermittently dropping packets
  C. high latency
  D. packets in a flow traversing multiple paths through the network
  E. some packets in a flow being process-switched and others being interrupt-switched on a transit router
  D. packets in a flow traversing multiple paths through the network
  E. some packets in a flow being process-switched and others being interrupt-switched on a transit router

  ---

  In traditional packet forwarding systems, using different paths have varying latencies that cause out of order packets, eventually resulting in far lower performance for the network application. Also, if some packets are process switched quickly by the routing engine of the router while others are interrupt switched (which takes more time) then it could result in out of order packets. The other options would cause packet drops or latency, but not out of order packets.

• Question 439:

  DRAG DROP

  Drag each statement about EtherChannel protocols on the left to the matching EtherChannel protocol on the right.

  Select and Place:

  

  

• Question 440:

  Which option is true about output policing for the control plane?

  A. It improves router performance by limiting traffic sent to the control plane.
  B. It improves router performance by limiting traffic sent from the control plane.
  C. It improves router performance by limiting traffic sent to and from the control plane.
  D. It controls traffic originated from the router.
  D. It controls traffic originated from the router.