Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 961:

  Which statement describes what it means if a router has an OSPF priority set to 0?

  A. A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority.
  B. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR
  C. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.
  D. A router with the OSPF priority set to 0 is one that cannot participate in the election of a BDR, but it can become a DR
  C. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.

• Question 962:

  Which three statements about voice VLANs are true? (Choose Three)

  A. Incoming CoS values are trusted only for untagged traffic.
  B. When vice VLANs are enabled, PortFast is configured automatically.
  C. When voice VLANS are configured, all untagged traffic is set to CoS 5.
  D. IP Phones override the CoS on all incoming tagged and untagged traffic.
  E. Their default CoS value is 0.
  F. They are disabled by default.
  A. Incoming CoS values are trusted only for untagged traffic.
  D. IP Phones override the CoS on all incoming tagged and untagged traffic.
  F. They are disabled by default.

• Question 963:

  What is the goal of Unicast Reverse Path Forwarding?

  A. to verify the reachability of the destination address in forwarded packets
  B. to help control network congestion
  C. to verify the reachability of the destination address in multicast packets
  D. to verify the reachability of the source address in forwarded packets
  D. to verify the reachability of the source address in forwarded packets

  ---

  Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded.

  Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html

• Question 964:

  Refer to the exhibit.

  

  What is the PHB class on this flow?

  A. EF
  B. none
  C. AF21
  D. CS4
  D. CS4

  ---

  This command shows the TOS value in hex, which is 80 in this case. The following chart shows some common DSCP/PHB Class values:

  Service DSCP value TOS value Juniper Alias TOS hexadecimal DSCP - TOS Binary Premium IP ef B8 101110 - 101110xx LBE cs1 001000 - 001000xx DWS cs4 100000 - 100000xx Network control cs6 c0 110000 - 110000xx Network control 2 cs7 e0 111000 - 111000xx

  Reference: http://www.tucny.com/Home/dscp-tos

• Question 965:

  DRAG DROP

  Drag and drop the Cisco IOS XE subpackage on the left to the function it performs on the right.

  Select and Place:

  

  

• Question 966:

  Refer to the exhibit.

  

  Which kind of ICMPv6 packet is shown in the output?

  A. neighbor advertisement
  B. neighbor solicitation
  C. router discovery
  D. time exceeded
  E. router advertisement
  B. neighbor solicitation

• Question 967:

  Refer to the exhibit.

  

  Which statement about this device configuration is true?

  A. The NMS needs a specific route configured to enable it to reach the Loopback0 interface of the device.
  B. The ifindex of the device could be different when the device is reloaded.
  C. The device will allow anyone to poll it via the public community.
  D. The device configuration requires the AuthNoPriv security level.
  B. The ifindex of the device could be different when the device is reloaded.

  ---

  One of the most commonly used identifiers in SNMP-based network management applications is the Interface Index (ifIndex) value. IfIndex is a unique identifying number associated with a physical or logical interface. For most software, the ifIndex is the name of the interface. Although relevant RFCs do not require that the correspondence between particular ifIndex values and their interfaces be maintained across reboots, applications such as device inventory, billing, and fault detection depend on this correspondence. Consider a situation where a simple monitoring software (like MRTG) is polling the interface statistics of the router specific serial interface going to the internet.

  As an example, you could have these conditions prior to re-initialization:

  physical port ifIndex ethernet port tokenring port serial port Therefore, the management application is polling the ifIndex 3, which corresponds to the serial port. After the router re-initialization (reboot, reload and so on) the conditions change to something similar to this:

  physical port ifIndex ethernet port tokenring port serial port The management application continues polling the ifIndex 3, which corresponds now to the ethernet port. Therefore, if the management application is not warned by a trap, for example, that the router has been rebooted, the statistics polled could be completely wrong. Reference: http://www.cisco.com/c/en/us/support/docs/ip/simple-network-management- protocol-snmp/28420-ifIndex-Persistence.html

• Question 968:

  Which three statements are true about PPP CHAP authentication? (Choose three.)

  A. PPP encapsulation must be enabled globally.
  B. The LCP phase must be complete and in closed state.
  C. The hostname used by a router for CHAP authentication cannot be changed.
  D. PPP encapsulation must be enabled on the interface.
  E. The LCP phase must be complete and in open state.
  F. By default, the router uses its hostname to identify itself to the peer.
  D. PPP encapsulation must be enabled on the interface.
  E. The LCP phase must be complete and in open state.
  F. By default, the router uses its hostname to identify itself to the peer.

  ---

  Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. This document provides some troubleshooting procedures for PPP authentication issues. Prerequisites Enable PPP encapsulation The PPP authentication phase does not begin until the Link Control Protocol (LCP) phase is complete and is in the open state. If debug ppp negotiation does not indicate that LCP is open, troubleshoot this issue before proceeding. Note. By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command.

  Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol- ppp/25647-understanding-ppp-chap.html

• Question 969:

  Which two solutions can reduce UDP latency? (Choose two.)

  A. fast retransmission
  B. fast recovery
  C. fast start
  D. low-latency queuing
  E. IP service level agreements
  F. congestion-avoidance algorithm
  D. low-latency queuing
  E. IP service level agreements

  ---

  IP SLA uses active traffic monitoring, which generates traffic in a continuous, reliable, and predictable manner to measure network performance. IP SLA sends data across the network to measure performance between multiple network locations or across multiple network paths. It simulates network data and IP services, and collects network performance information in real time. This information is collected: Response times One-way latency, jitter (interpacket delay variance) Packet loss Network resource availability LLQ uses the priority command. The priority command allows you to set up classes based on a variety of criteria (not just User Datagram Ports (UDP) ports) and assign priority to them, and is available for use on serial interfaces and ATM permanent virtual circuits (PVCs). A similar command, the ip rtp priority command, allows you to stipulate priority flows based only on UDP port numbers. Note: All the other answer choices can be used to improve TCP performance, but not UDP.

  References: http://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4- 2/system_monitoring/configuration/guide/b_sysmon_cg42xr12k/ b_sysmon_cg42xr12k_cha pter_011.html http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsllq26.html

• Question 970:

  DRAG DROP

  Drag and drop the OTV component on the left to the function it performs on the right.

  Select and Place: